Commonwealth Edison 10-K14 Feb 232022 FY Annual reportFinancial data

Company Profile

Cover Page

Cover Page - USD ($)	12 Months Ended
Cover Page - USD ($)	Dec. 31, 2022	Jan. 31, 2023	Aug. 05, 2022
Document Type	10-K
Amendment Flag	false
Document Annual Report	true
Document Period End Date	Dec. 31, 2022
Document Transition Report	false
Entity File Number	001-16169
Entity Registrant Name	EXELON CORPORATION
Entity Tax Identification Number	23-2990190
Entity Incorporation, State or Country Code	PA
Entity Address, Address Line One	10 South Dearborn Street
Entity Address, Address Line Two	P.O. Box 805379
Entity Address, City or Town	Chicago
Entity Address, State or Province	IL
Entity Address, Postal Zip Code	60680-5379
City Area Code	(800)
Local Phone Number	483-3220
Title of 12(b) Security	Common Stock, without par value
Trading Symbol	EXC
Security Exchange Name	NASDAQ
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Entity Public Float			$ 44,452,390,343
Entity Common Stock Shares Outstanding		994,126,931
Documents Incorporated by Reference [Text Block]	Portions of the Exelon Proxy Statement for the 2022 Annual Meeting of Shareholders and the Commonwealth Edison Company 2022 Information Statement are incorporated by reference in Part III.
Entity Central Index Key	0001109357
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	FY
Commonwealth Edison Co [Member]
Entity File Number	001-01839
Entity Registrant Name	COMMONWEALTH EDISON COMPANY
Entity Tax Identification Number	36-0938600
Entity Incorporation, State or Country Code	IL
Entity Address, Address Line One	10 South Dearborn Street
Entity Address, City or Town	Chicago
Entity Address, State or Province	IL
Entity Address, Postal Zip Code	60603-2300
City Area Code	(312)
Local Phone Number	394-4321
Title of 12(g) Security	Common Stock Purchase Warrants (1971 Warrants and Series B Warrants)
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Common Stock Shares Outstanding		127,021,394
Entity Central Index Key	0000022606
PECO Energy Co [Member]
Entity File Number	000-16844
Entity Registrant Name	PECO ENERGY COMPANY
Entity Tax Identification Number	23-0970240
Entity Incorporation, State or Country Code	PA
Entity Address, Address Line One	P.O. Box 8699
Entity Address, Address Line Two	2301 Market Street
Entity Address, City or Town	Philadelphia
Entity Address, State or Province	PA
Entity Address, Postal Zip Code	19101-8699
City Area Code	(215)
Local Phone Number	841-4000
Title of 12(b) Security	Cumulative Preferred Security, Series D
Trading Symbol	EXC/28
Security Exchange Name	NYSE
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Common Stock Shares Outstanding		170,478,507
Entity Central Index Key	0000078100
Baltimore Gas and Electric Company [Member]
Entity File Number	001-01910
Entity Registrant Name	BALTIMORE GAS AND ELECTRIC COMPANY
Entity Tax Identification Number	52-0280210
Entity Incorporation, State or Country Code	MD
Entity Address, Address Line One	2 Center Plaza
Entity Address, Address Line Two	110 West Fayette Street
Entity Address, City or Town	Baltimore
Entity Address, State or Province	MD
Entity Address, Postal Zip Code	21201-3708
City Area Code	(410)
Local Phone Number	234-5000
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Common Stock Shares Outstanding		1,000
Entity Central Index Key	0000009466
Pepco Holdings LLC [Member]
Entity File Number	001-31403
Entity Registrant Name	PEPCO HOLDINGS LLC
Entity Tax Identification Number	52-2297449
Entity Incorporation, State or Country Code	DE
Entity Address, Address Line One	701 Ninth Street, N.W.
Entity Address, City or Town	Washington, District of Columbia
Entity Address, Postal Zip Code	20068-0001
City Area Code	(202)
Local Phone Number	872-2000
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Central Index Key	0001135971
Potomac Electric Power Company [Member]
Entity File Number	001-01072
Entity Registrant Name	POTOMAC ELECTRIC POWER COMPANY
Entity Tax Identification Number	53-0127880
Entity Address, Address Line One	701 Ninth Street, N.W.
Entity Address, City or Town	Washington, District of Columbia
Entity Address, Postal Zip Code	20068-0001
City Area Code	(202)
Local Phone Number	872-2000
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Common Stock Shares Outstanding		100
Entity Central Index Key	0000079732
Delmarva Power & Light Company [Member]
Entity File Number	001-01405
Entity Registrant Name	DELMARVA POWER & LIGHT COMPANY
Entity Tax Identification Number	51-0084283
Entity Address, Address Line One	500 North Wakefield Drive
Entity Address, City or Town	Newark
Entity Address, State or Province	DE
Entity Address, Postal Zip Code	19702-5440
City Area Code	(202)
Local Phone Number	872-2000
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Common Stock Shares Outstanding		1,000
Entity Central Index Key	0000027879
Atlantic City Electric Company [Member]
Entity File Number	001-03559
Entity Registrant Name	ATLANTIC CITY ELECTRIC COMPANY
Entity Tax Identification Number	21-0398280
Entity Incorporation, State or Country Code	NJ
Entity Address, Address Line One	500 North Wakefield Drive
Entity Address, City or Town	Newark
Entity Address, State or Province	DE
Entity Address, Postal Zip Code	19702-5440
City Area Code	(202)
Local Phone Number	872-2000
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Common Stock Shares Outstanding		8,546,017
Entity Central Index Key	0000008192
VIRGINIA \| Potomac Electric Power Company [Member]
Entity Incorporation, State or Country Code	VA
VIRGINIA \| Delmarva Power & Light Company [Member]
Entity Incorporation, State or Country Code	VA
DELAWARE \| Delmarva Power & Light Company [Member]
Entity Incorporation, State or Country Code	DE
DISTRICT OF COLUMBIA \| Potomac Electric Power Company [Member]
Entity Incorporation, State or Country Code	DC

Auditor Information

Auditor Information	12 Months Ended
Auditor Information	Dec. 31, 2022
Auditor [Line Items]
Auditor Name	PricewaterhouseCoopers LLP
Auditor Location	Chicago, Illinois
Auditor Firm ID	238

Consolidated Statements of Oper

Consolidated Statements of Operations and Comprehensive Income - USD ($) shares in Millions, $ in Millions		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Operating revenues
Revenues from alternative revenue programs		$ 161	$ 171	$ 6
Total operating revenues		19,078	17,938	16,663
Operating expenses
Purchased power and/or fuel from affiliates		159	1,178	1,209
Operating and maintenance		4,673	4,547	4,641
Depreciation and Amortization		3,325	3,033	2,891
Taxes other than income		1,390	1,291	1,232
Total operating expenses		15,761	15,256	14,485
Gain on sales of assets and businesses		(2)	0	13
Operating income (loss)		3,315	2,682	2,191
Other income and (deductions)
Interest Expense, net		(1,422)	(1,264)	(1,282)
Interest expense to affiliates		(25)	(25)	(25)
Other, net		535	261	208
Total other income and (deductions)		(912)	(1,028)	(1,099)
Income (loss) before income taxes		2,403	1,654	1,092
Income taxes		349	38	(7)
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest		2,054	1,616	1,099
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest		117	213	855
Net income (loss)		2,171	1,829	1,954
Net income (loss) attributable to noncontrolling interests		1	123	(9)
Net income (loss) attributable to common shareholders		2,170	1,706	1,963
Net Income (Loss) from Continuing Operations Available to Common Shareholders, Basic		2,054	1,616	1,099
Net Income (Loss) from Discontinued Operations Available to Common Shareholders, Basic		116	90	864
Other comprehensive income (loss), net of income taxes
Prior service benefit reclassified to periodic benefit cost		(1)	(4)	(40)
Actuarial loss reclassified to periodic cost		42	223	190
Pension and non-pension postretirement benefit plan valuation adjustment		46	432	(357)
Unrealized (loss) gain on cash flow hedges		2	(1)	(3)
Unrealized (loss) gain on foreign currency translation		0	0	4
Other comprehensive income (loss)		89	650	(206)
Comprehensive income (loss)		2,260	2,479	1,748
Comprehensive income attributable to noncontrolling interests		1	123	(9)
Comprehensive income (loss) attributable to common shareholders		$ 2,259	$ 2,356	$ 1,757
Average shares of common stock outstanding:
Basic Average Number of Shares Outstanding		986	979	976
Assumed Exercise and/or Distributions of Stock-Based Awards		1	1	1
Diluted Average Number of Shares Outstanding	[1]	987	980	977
Income (Loss) from Continuing Operations, Per Basic Share		$ 2.08	$ 1.65	$ 1.13
Income (Loss) from Continuing Operations, Per Diluted Share		2.08	1.65	1.13
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share		0.12	0.09	0.88
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share		$ 0.12	$ 0.09	$ 0.88
Earnings per average common share from discontinued operations
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount		0	0	1
Commonwealth Edison Co [Member]
Operating revenues
Revenues from alternative revenue programs		$ 267	$ 42	$ (47)
Operating revenues from affiliates		16	41	37
Total operating revenues		5,761	6,406	5,904
Operating expenses
Purchased power and/or fuel from affiliates		59	383	345
Operating and maintenance		1,094	1,048	1,231
Operating and maintenance from affiliates		318	307	289
Depreciation and Amortization		1,323	1,205	1,133
Taxes other than income		374	320	299
Total operating expenses		4,218	5,151	4,950
Gain on sales of assets and businesses		(2)	0	0
Operating income (loss)		1,541	1,255	954
Other income and (deductions)
Interest Expense, net		(401)	(376)	(369)
Interest expense to affiliates		(13)	(13)	(13)
Other, net		54	48	43
Total other income and (deductions)		(360)	(341)	(339)
Income (loss) before income taxes		1,181	914	615
Income taxes		264	172	177
Net income (loss)		917	742	438
Other comprehensive income (loss), net of income taxes
Comprehensive income (loss)		917	742	438
PECO Energy Co [Member]
Operating revenues
Revenues from alternative revenue programs		2	26	16
Operating revenues from affiliates		7	21	9
Total operating revenues		3,903	3,198	3,058
Operating expenses
Purchased power and/or fuel from affiliates		33	194	188
Operating and maintenance		791	757	816
Operating and maintenance from affiliates		201	177	159
Depreciation and Amortization		373	348	347
Taxes other than income		202	184	172
Total operating expenses		3,102	2,547	2,512
Operating income (loss)		801	651	546
Other income and (deductions)
Interest Expense, net		(165)	(149)	(136)
Interest expense to affiliates		(12)	(12)	(11)
Other, net		31	26	18
Total other income and (deductions)		(146)	(135)	(129)
Income (loss) before income taxes		655	516	417
Income taxes		79	12	(30)
Net income (loss)		576	504	447
Other comprehensive income (loss), net of income taxes
Comprehensive income (loss)		576	504	447
Baltimore Gas and Electric Company [Member]
Operating revenues
Revenues from alternative revenue programs		(47)	12	16
Operating revenues from affiliates		15	31	20
Total operating revenues		3,895	3,341	3,098
Operating expenses
Purchased power and/or fuel from affiliates		18	233	311
Operating and maintenance		670	618	617
Operating and maintenance from affiliates		207	193	172
Depreciation and Amortization		630	591	550
Taxes other than income		302	283	268
Total operating expenses		3,376	2,860	2,598
Operating income (loss)		519	481	500
Other income and (deductions)
Interest Expense, net		(152)	(138)	(133)
Other, net		21	30	23
Total other income and (deductions)		(131)	(108)	(110)
Income (loss) before income taxes		388	373	390
Income taxes		8	(35)	41
Net income (loss)		380	408	349
Other comprehensive income (loss), net of income taxes
Comprehensive income (loss)		380	408	349
Pepco Holdings LLC [Member]
Operating revenues
Revenues from alternative revenue programs		(59)	91	21
Operating revenues from affiliates		10	13	17
Total operating revenues		5,565	5,041	4,663
Operating expenses
Purchased power and/or fuel from affiliates		51	367	366
Operating and maintenance		966	925	940
Operating and maintenance from affiliates		191	179	159
Depreciation and Amortization		938	821	782
Taxes other than income		475	458	450
Total operating expenses		4,734	4,240	4,045
Gain on sales of assets and businesses		0	0	11
Operating income (loss)		831	801	629
Other income and (deductions)
Interest Expense, net		(292)	(267)	(268)
Other, net		78	69	57
Total other income and (deductions)		(214)	(198)	(211)
Income (loss) before income taxes		617	603	418
Income taxes		9	42	(77)
Net income (loss)		608	561	495
Other comprehensive income (loss), net of income taxes
Comprehensive income (loss) attributable to common shareholders		608	561	495
Potomac Electric Power Company [Member]
Operating revenues
Revenues from alternative revenue programs		(31)	53	40
Operating revenues from affiliates		5	5	7
Total operating revenues		2,531	2,274	2,149
Operating expenses
Purchased power and/or fuel from affiliates		39	271	278
Operating and maintenance		284	258	248
Operating and maintenance from affiliates		223	213	205
Depreciation and Amortization		417	403	377
Taxes other than income		382	373	367
Total operating expenses		2,140	1,871	1,799
Gain on sales of assets and businesses		0	0	9
Operating income (loss)		391	403	359
Other income and (deductions)
Interest Expense, net		(150)	(140)	(138)
Other, net		55	48	38
Total other income and (deductions)		(95)	(92)	(100)
Income (loss) before income taxes		296	311	259
Income taxes		(9)	15	(7)
Net income (loss)		305	296	266
Other comprehensive income (loss), net of income taxes
Comprehensive income (loss)		305	296	266
Delmarva Power & Light Company [Member]
Operating revenues
Revenues from alternative revenue programs		(9)	14	(7)
Operating revenues from affiliates		6	7	9
Total operating revenues		1,595	1,380	1,271
Operating expenses
Purchased power and/or fuel from affiliates		10	79	75
Operating and maintenance		183	183	208
Operating and maintenance from affiliates		166	162	153
Depreciation and Amortization		232	210	191
Taxes other than income		72	67	65
Total operating expenses		1,359	1,161	1,120
Operating income (loss)		236	219	151
Other income and (deductions)
Interest Expense, net		(66)	(61)	(61)
Other, net		13	12	10
Total other income and (deductions)		(53)	(49)	(51)
Income (loss) before income taxes		183	170	100
Income taxes		14	42	(25)
Net income (loss)		169	128	125
Other comprehensive income (loss), net of income taxes
Comprehensive income (loss)		169	128	125
Atlantic City Electric Company [Member]
Operating revenues
Revenues from alternative revenue programs		(19)	24	(12)
Operating revenues from affiliates		2	2	4
Total operating revenues		1,431	1,388	1,245
Operating expenses
Purchased power and/or fuel from affiliates		2	17	13
Operating and maintenance		189	179	192
Operating and maintenance from affiliates		142	141	134
Depreciation and Amortization		261	179	180
Taxes other than income		9	8	8
Total operating expenses		1,225	1,201	1,123
Gain on sales of assets and businesses		0	0	2
Operating income (loss)		206	187	124
Other income and (deductions)
Interest Expense, net		(66)	(58)	(59)
Other, net		11	4	6
Total other income and (deductions)		(55)	(54)	(53)
Income (loss) before income taxes		151	133	71
Income taxes		3	(13)	(41)
Net income (loss)		148	146	112
Other comprehensive income (loss), net of income taxes
Comprehensive income (loss)		148	146	112
Electricity, US Regulated [Member]
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax		16,899	16,245	15,236
Operating expenses
Purchased power and/or fuel		5,380	4,703	4,086
Electricity, US Regulated [Member] \| Commonwealth Edison Co [Member]
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax		5,478	6,323	5,914
Operating expenses
Purchased power and/or fuel		1,050	1,888	1,653
Electricity, US Regulated [Member] \| PECO Energy Co [Member]
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax		3,156	2,613	2,519
Operating expenses
Purchased power and/or fuel		1,160	699	645
Electricity, US Regulated [Member] \| Baltimore Gas and Electric Company [Member]
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax		2,890	2,497	2,323
Operating expenses
Purchased power and/or fuel		1,186	699	509
Electricity, US Regulated [Member] \| Pepco Holdings LLC [Member]
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax		5,376	4,769	4,463
Operating expenses
Purchased power and/or fuel		1,984	1,417	1,279
Electricity, US Regulated [Member] \| Potomac Electric Power Company [Member]
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax		2,557	2,216	2,102
Operating expenses
Purchased power and/or fuel		795	353	324
Electricity, US Regulated [Member] \| Delmarva Power & Light Company [Member]
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax		1,360	1,191	1,107
Operating expenses
Purchased power and/or fuel		567	387	359
Electricity, US Regulated [Member] \| Atlantic City Electric Company [Member]
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax		1,448	1,362	1,253
Operating expenses
Purchased power and/or fuel		622	677	596
Natural Gas, US Regulated [Member]
Operating revenues
Revenue from Contract with Customer, Excluding Assessed Tax		2,018	1,522	1,421
Operating expenses
Purchased power and/or fuel		834	504	426
Natural Gas, US Regulated [Member] \| PECO Energy Co [Member]
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax		738	538	514
Operating expenses
Purchased power and/or fuel		342	188	185
Natural Gas, US Regulated [Member] \| Baltimore Gas and Electric Company [Member]
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax		1,037	801	739
Operating expenses
Purchased power and/or fuel		363	243	171
Natural Gas, US Regulated [Member] \| Pepco Holdings LLC [Member]
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax		238	168	162
Operating expenses
Purchased power and/or fuel		129	73	69
Natural Gas, US Regulated [Member] \| Delmarva Power & Light Company [Member]
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax		238	168	162
Operating expenses
Purchased power and/or fuel		$ 129	$ 73	$ 69

[1]The number of stock options not included in the calculation of diluted common shares outstanding due to their antidilutive effect were none for the year ended December 31, 2022 and 2021 and less than 1 million for the years ended December 31, 2020

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash flows from operating activities
Net income (loss)	$ 2,171	$ 1,829	$ 1,954
Adjustments to reconcile net income to net cash flows provided by operating activities:
Depreciation, amortization and accretion, including nuclear fuel and energy contract amortization	3,533	7,573	6,527
Asset impairments	48	552	591
Gain on sales of assets and businesses	(8)	(201)	(24)
Deferred income taxes and amortization of investment tax credits	255	18	309
Net fair value changes related to derivatives	(53)	(568)	(268)
Net realized and unrealized gains on NDT fund investments	205	(586)	(461)
Net unrealized losses (gains) on equity investments	16	160	(186)
Other non-cash operating activities	370	(200)	592
Changes in assets and liabilities:
Accounts receivable	(1,222)	(703)	697
Inventories	(121)	(141)	(85)
Accounts payable and accrued expenses	1,318	440	(129)
Option premiums paid, net	(39)	(338)	(139)
Collateral received (posted), net	1,248	(74)	494
Income taxes	(4)	327	140
Increase (Decrease) in Regulatory Assets and Liabilities	(1,326)	(634)	(649)
Pension and non-pension postretirement benefit contributions	(616)	(665)	(601)
Other assets and liabilities	(905)	(3,777)	(4,527)
Net cash flows provided by operating activities	4,870	3,012	4,235
Cash flows from investing activities
Capital expenditures	(7,147)	(7,981)	(8,048)
Proceeds from NDT fund sales	488	6,532	3,341
Investment in NDT funds	(516)	(6,673)	(3,464)
Collection of deferred purchase price	169	3,902	3,771
Proceeds from sales of assets and businesses	16	877	46
Other investing activities	0	26	18
Net cash flows used in investing activities	(6,990)	(3,317)	(4,336)
Cash flows from financing activities
Changes in short-term borrowings	986	269	161
Proceeds from short-term borrowings with maturities greater than 90 days	1,300	1,380	500
Repayments on short-term borrowings with maturities greater than 90 days	(1,500)	(350)	0
Issuance of long-term debt	6,309	3,481	7,507
Retirement of long-term debt	(2,073)	(1,640)	(6,440)
Proceeds from Issuance of Common Stock	563	0	0
Dividends paid on common stock	(1,334)	(1,497)	(1,492)
Acquisition of CENG noncontrolling interest	0	(885)	0
Proceeds from employee stock plans	36	80	45
Transfer of cash, restricted cash, and cash equivalents to Constellation	(2,594)	0	0
Other financing activities	(102)	(80)	(136)
Net cash flows provided by (used in) financing activities	1,591	758	145
Increase (decrease) in cash, restricted cash, and cash equivalents	(529)	453	44
Cash, restricted cash, and cash equivalents at beginning of period	1,619	1,166	1,122
Cash, restricted cash, and cash equivalents at end of period	1,090	1,619	1,166
Increase (decrease) in capital expenditures not paid	36	16	194
Increase in Deferred Purchase Price	348	3,652	4,441
Increase (decrease) in PPE related to ARO update	332	642	850
Commonwealth Edison Co [Member]
Cash flows from operating activities
Net income (loss)	917	742	438
Adjustments to reconcile net income to net cash flows provided by operating activities:
Depreciation, amortization and accretion, including nuclear fuel and energy contract amortization	1,323	1,205	1,133
Deferred income taxes and amortization of investment tax credits	241	244	228
Other non-cash operating activities	(165)	126	202
Changes in assets and liabilities:
Accounts receivable	(163)	(25)	(10)
Receivables from and payables to affiliates, net	(34)	32	(1)
Inventories	(28)	(2)	(13)
Accounts payable and accrued expenses	406	0	63
Collateral received (posted), net	51	0	14
Income taxes	0	0	8
Increase (Decrease) in Regulatory Assets and Liabilities	(1,033)	(388)	(410)
Pension and non-pension postretirement benefit contributions	(184)	(196)	(148)
Other assets and liabilities	(134)	(143)	(180)
Net cash flows provided by operating activities	1,197	1,595	1,324
Cash flows from investing activities
Capital expenditures	(2,506)	(2,387)	(2,217)
Other investing activities	28	26	2
Net cash flows used in investing activities	(2,478)	(2,361)	(2,215)
Cash flows from financing activities
Changes in short-term borrowings	427	(323)	193
Proceeds from short-term borrowings with maturities greater than 90 days	150	0	0
Issuance of long-term debt	750	1,150	1,000
Retirement of long-term debt	0	(350)	(500)
Dividends paid on common stock	(578)	(507)	(499)
Contributions from parent	670	791	712
Other financing activities	(11)	(16)	(13)
Net cash flows provided by (used in) financing activities	1,408	745	893
Increase (decrease) in cash, restricted cash, and cash equivalents	127	(21)	2
Cash, restricted cash, and cash equivalents at beginning of period	384	405	403
Cash, restricted cash, and cash equivalents at end of period	511	384	405
Increase (decrease) in capital expenditures not paid	(20)	(46)	109
PECO Energy Co [Member]
Cash flows from operating activities
Net income (loss)	576	504	447
Adjustments to reconcile net income to net cash flows provided by operating activities:
Depreciation, amortization and accretion, including nuclear fuel and energy contract amortization	373	348	347
Deferred income taxes and amortization of investment tax credits	70	11	(23)
Other non-cash operating activities	40	0	24
Changes in assets and liabilities:
Accounts receivable	(205)	(35)	(88)
Receivables from and payables to affiliates, net	(31)	21	(6)
Inventories	(56)	(26)	(1)
Accounts payable and accrued expenses	152	15	63
Income taxes	(20)	5	31
Increase (Decrease) in Regulatory Assets and Liabilities	(45)	(21)	1
Pension and non-pension postretirement benefit contributions	(18)	(18)	(18)
Other assets and liabilities	5	(31)	0
Net cash flows provided by operating activities	841	773	777
Cash flows from investing activities
Capital expenditures	(1,349)	(1,240)	(1,147)
Changes in Exelon/PHI intercompany money pool	0	0	68
Other investing activities	8	9	7
Net cash flows used in investing activities	(1,341)	(1,231)	(1,072)
Cash flows from financing activities
Changes in short-term borrowings	239	0	0
Issuance of long-term debt	775	750	350
Retirement of long-term debt	(350)	(300)	0
Changes in Exelon/PHI intercompany money pool	0	(40)	40
Dividends paid on common stock	(399)	(339)	(340)
Contributions from parent	274	414	248
Other financing activities	(15)	(9)	(4)
Net cash flows provided by (used in) financing activities	524	476	294
Increase (decrease) in cash, restricted cash, and cash equivalents	24	18	(1)
Cash, restricted cash, and cash equivalents at beginning of period	44	26	27
Cash, restricted cash, and cash equivalents at end of period	68	44	26
Increase (decrease) in capital expenditures not paid	9	26	55
Baltimore Gas and Electric Company [Member]
Cash flows from operating activities
Net income (loss)	380	408	349
Adjustments to reconcile net income to net cash flows provided by operating activities:
Depreciation, amortization and accretion, including nuclear fuel and energy contract amortization	630	591	550
Asset impairments	48	0	0
Deferred income taxes and amortization of investment tax credits	9	(17)	37
Other non-cash operating activities	135	75	97
Changes in assets and liabilities:
Accounts receivable	(197)	30	(165)
Receivables from and payables to affiliates, net	(2)	(13)	(8)
Inventories	(61)	(29)	10
Accounts payable and accrued expenses	77	14	102
Collateral received (posted), net	19	3	0
Income taxes	(17)	20	60
Increase (Decrease) in Regulatory Assets and Liabilities	(160)	(152)	(118)
Pension and non-pension postretirement benefit contributions	(68)	(81)	(78)
Other assets and liabilities	(33)	(120)	48
Net cash flows provided by operating activities	760	729	884
Cash flows from investing activities
Capital expenditures	(1,262)	(1,226)	(1,247)
Other investing activities	11	18	2
Net cash flows used in investing activities	(1,251)	(1,208)	(1,245)
Cash flows from financing activities
Changes in short-term borrowings	278	130	(76)
Issuance of long-term debt	500	600	400
Retirement of long-term debt	(250)	(300)	0
Dividends paid on common stock	(300)	(292)	(246)
Contributions from parent	286	257	411
Other financing activities	(11)	(6)	(8)
Net cash flows provided by (used in) financing activities	503	389	481
Increase (decrease) in cash, restricted cash, and cash equivalents	12	(90)	120
Cash, restricted cash, and cash equivalents at beginning of period	55	145	25
Cash, restricted cash, and cash equivalents at end of period	67	55	145
Increase (decrease) in capital expenditures not paid	35	(59)	53
Pepco Holdings LLC [Member]
Cash flows from operating activities
Net income (loss)	608	561	495
Adjustments to reconcile net income to net cash flows provided by operating activities:
Depreciation, amortization and accretion, including nuclear fuel and energy contract amortization	938	821	782
Deferred income taxes and amortization of investment tax credits	(9)	24	(97)
Other non-cash operating activities	163	(12)	103
Changes in assets and liabilities:
Accounts receivable	(184)	(48)	(159)
Receivables from and payables to affiliates, net	(46)	6	3
Inventories	(34)	(16)	(6)
Accounts payable and accrued expenses	30	34	49
Collateral received (posted), net	148	49	0
Income taxes	(1)	17	(25)
Increase (Decrease) in Regulatory Assets and Liabilities	(136)	(99)	(129)
Pension and non-pension postretirement benefit contributions	(78)	(48)	(39)
Other assets and liabilities	(149)	(132)	25
Net cash flows provided by operating activities	1,250	1,157	1,002
Cash flows from investing activities
Capital expenditures	(1,709)	(1,720)	(1,604)
Other investing activities	6	2	7
Net cash flows used in investing activities	(1,703)	(1,718)	(1,597)
Cash flows from financing activities
Changes in short-term borrowings	(54)	100	160
Issuance of long-term debt	925	825	602
Retirement of long-term debt	(310)	(260)	(128)
Changes in Exelon/PHI intercompany money pool	37	(14)	9
Distributions to member	(750)	(703)	(553)
Contributions from member	787	683	494
Other financing activities	(22)	(17)	(10)
Net cash flows provided by (used in) financing activities	613	614	574
Increase (decrease) in cash, restricted cash, and cash equivalents	160	53	(21)
Cash, restricted cash, and cash equivalents at beginning of period	213	160	181
Cash, restricted cash, and cash equivalents at end of period	373	213	160
Increase (decrease) in capital expenditures not paid	136	(6)	54
Potomac Electric Power Company [Member]
Cash flows from operating activities
Net income (loss)	305	296	266
Adjustments to reconcile net income to net cash flows provided by operating activities:
Depreciation, amortization and accretion, including nuclear fuel and energy contract amortization	417	403	377
Deferred income taxes and amortization of investment tax credits	(17)	(8)	(46)
Other non-cash operating activities	36	(52)	(23)
Changes in assets and liabilities:
Accounts receivable	(104)	(28)	(67)
Receivables from and payables to affiliates, net	(33)	6	(12)
Inventories	(16)	(8)	1
Accounts payable and accrued expenses	24	16	41
Collateral received (posted), net	24	2	0
Income taxes	(19)	11	(1)
Increase (Decrease) in Regulatory Assets and Liabilities	(69)	(81)	(55)
Pension and non-pension postretirement benefit contributions	(11)	(11)	(11)
Other assets and liabilities	(66)	(84)	31
Net cash flows provided by operating activities	471	462	501
Cash flows from investing activities
Capital expenditures	(874)	(843)	(773)
Other investing activities	3	(1)	0
Net cash flows used in investing activities	(871)	(844)	(773)
Cash flows from financing activities
Changes in short-term borrowings	124	140	(47)
Issuance of long-term debt	625	275	300
Retirement of long-term debt	(310)	0	(3)
Dividends paid on common stock	(463)	(268)	(232)
Contributions from parent	465	244	262
Other financing activities	(10)	(6)	(6)
Net cash flows provided by (used in) financing activities	431	385	274
Increase (decrease) in cash, restricted cash, and cash equivalents	31	3	2
Cash, restricted cash, and cash equivalents at beginning of period	68	65	63
Cash, restricted cash, and cash equivalents at end of period	99	68	65
Increase (decrease) in capital expenditures not paid	65	30	1
Delmarva Power & Light Company [Member]
Cash flows from operating activities
Net income (loss)	169	128	125
Adjustments to reconcile net income to net cash flows provided by operating activities:
Depreciation, amortization and accretion, including nuclear fuel and energy contract amortization	232	210	191
Deferred income taxes and amortization of investment tax credits	16	39	(13)
Other non-cash operating activities	29	3	51
Changes in assets and liabilities:
Accounts receivable	(59)	15	(34)
Receivables from and payables to affiliates, net	(10)	(3)	8
Inventories	(11)	(8)	(5)
Accounts payable and accrued expenses	19	16	4
Collateral received (posted), net	78	43	0
Income taxes	0	13	(25)
Increase (Decrease) in Regulatory Assets and Liabilities	(34)	(43)	(35)
Pension and non-pension postretirement benefit contributions	(1)	(1)	0
Other assets and liabilities	(10)	(27)	5
Net cash flows provided by operating activities	418	385	272
Cash flows from investing activities
Capital expenditures	(430)	(429)	(424)
Other investing activities	3	4	(3)
Net cash flows used in investing activities	(427)	(425)	(427)
Cash flows from financing activities
Changes in short-term borrowings	(34)	3	90
Issuance of long-term debt	125	125	178
Retirement of long-term debt	0	0	(80)
Dividends paid on common stock	(143)	(147)	(141)
Contributions from parent	147	120	112
Other financing activities	(5)	(5)	(2)
Net cash flows provided by (used in) financing activities	90	96	157
Increase (decrease) in cash, restricted cash, and cash equivalents	81	56	2
Cash, restricted cash, and cash equivalents at beginning of period	71	15	13
Cash, restricted cash, and cash equivalents at end of period	152	71	15
Increase (decrease) in capital expenditures not paid	23	(18)	20
Atlantic City Electric Company [Member]
Cash flows from operating activities
Net income (loss)	148	146	112
Adjustments to reconcile net income to net cash flows provided by operating activities:
Depreciation, amortization and accretion, including nuclear fuel and energy contract amortization	261	179	180
Deferred income taxes and amortization of investment tax credits	(2)	(15)	(37)
Other non-cash operating activities	46	0	36
Changes in assets and liabilities:
Accounts receivable	(19)	(37)	(55)
Receivables from and payables to affiliates, net	(4)	4	6
Inventories	(7)	1	(3)
Accounts payable and accrued expenses	(9)	3	5
Collateral received (posted), net	46	4	0
Income taxes	11	0	(1)
Increase (Decrease) in Regulatory Assets and Liabilities	(19)	24	(42)
Pension and non-pension postretirement benefit contributions	(7)	(3)	(2)
Other assets and liabilities	(61)	(11)	0
Net cash flows provided by operating activities	384	295	199
Cash flows from investing activities
Capital expenditures	(398)	(445)	(401)
Other investing activities	1	1	6
Net cash flows used in investing activities	(397)	(444)	(395)
Cash flows from financing activities
Changes in short-term borrowings	(144)	(43)	117
Issuance of long-term debt	175	425	123
Retirement of long-term debt	0	(260)	(44)
Dividends paid on common stock	(145)	(288)	(114)
Contributions from parent	175	319	117
Other financing activities	(5)	(5)	(1)
Net cash flows provided by (used in) financing activities	56	148	198
Increase (decrease) in cash, restricted cash, and cash equivalents	43	(1)	2
Cash, restricted cash, and cash equivalents at beginning of period	29	30	28
Cash, restricted cash, and cash equivalents at end of period	72	29	30
Increase (decrease) in capital expenditures not paid	$ 48	$ (18)	$ 33

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Millions		Dec. 31, 2022	Dec. 31, 2021
Current assets
Cash and cash equivalents		$ 407	$ 672
Restricted cash and cash equivalents		566	321
Accounts receivable
Customer accounts receivable		2,544	2,189
Customer allowance for credit losses		(327)	(320)
Customer accounts receivable, net		2,217	1,869
Other accounts receivable		1,426	1,068
Other allowance for credit losses		(82)	(72)
Other accounts receivable, net		1,344	996
Inventories, net
Fossil fuel and emission allowances		208	105
Materials and supplies		547	476
Regulatory assets, current		1,641	1,296
Other		406	387
Currents assets of discontinued operations		0	7,835
Total current assets		7,336	13,957
Accumulated depreciation and amortization		15,930	14,430
Property, plant and equipment, net		69,076	64,558
Deferred debits and other assets
Regulatory assets, noncurrent		8,037	8,224
Goodwill		6,630	6,630
Receivable related to Regulatory Agreement Units		2,897	0
Investments		232	250
Other		1,141	885
Property, plant, and equipment, deferred debits, and other assets of discontinued operations		0	38,509
Total deferred debits and other assets		18,937	54,498
Total assets		95,349	133,013
Current liabilities
Short-term borrowings		2,586	1,248
Long-term debt due within one year		1,802	2,153
Accounts payable		3,382	2,379
Accrued expenses		1,226	1,137
Payables to affiliates, current		5	5
Regulatory liabilities, current		437	376
Mark-to-market derivative liabilities, current		8	18
Unamortized energy contract liabilities, current		10	89
Other		1,155	766
Current liabilities of discontinued operations		0	7,940
Total current liabilities		10,611	16,111
Long-term debt		35,272	30,749
Long-term debt to financing trusts		390	390
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits		11,250	10,611
Regulatory liabilities, noncurrent		9,112	9,628
Asset retirement obligations, noncurrent		269	271
Pension obligations		1,109	2,051
Non-pension postretirement benefits obligations		507	811
Mark-to-market derivative liabilities, noncurrent		83	201
Unamortized energy contract liabilities, noncurrent		35	146
Other		1,967	1,573
Long-term debt, deferred credits, and other liabilities of discontinued operations		0	25,676
Total deferred credits and other liabilities		24,332	50,968
Total liabilities		70,605	98,218
Commitments and contingencies
Shareholders’ equity
Common Stock, No Par Value		$ 0	$ 0
Common Stock, Shares Authorized		2,000,000,000	2,000,000,000
Common Stock, Shares, Outstanding		994,000,000	979,000,000
Common stock		$ 20,908	$ 20,324
Treasury Stock, Shares		2,000,000	2,000,000
Treasury stock, at cost		$ (123)	$ (123)
Retained earnings/Undistributed earnings (losses)		4,597	16,942
Accumulated other comprehensive loss, net		(638)	(2,750)
Total shareholders’ equity		24,744	34,393
Member’s equity
Noncontrolling interests		0	402
Total equity		24,744	34,795
Total liabilities and equity		95,349	133,013
Commonwealth Edison Co [Member]
Current assets
Cash and cash equivalents		67	131
Restricted cash and cash equivalents		327	210
Accounts receivable
Customer accounts receivable		558	647
Customer allowance for credit losses		(59)	(73)
Customer accounts receivable, net		499	574
Other accounts receivable		441	227
Other allowance for credit losses		(17)	(17)
Other accounts receivable, net		424	210
Receivables from affiliates, current		3	16
Inventories, net
Inventories, net		196	170
Regulatory assets, current		775	335
Other		92	76
Total current assets		2,383	1,722
Accumulated depreciation and amortization		6,673	6,099
Property, plant and equipment, net		27,513	25,995
Deferred debits and other assets
Regulatory assets, noncurrent		2,667	1,870
Goodwill		2,625	2,625
Receivable from affiliates, noncurrent		0	2,761
Receivable related to Regulatory Agreement Units		2,660	0
Investments		6	6
Prepaid pension asset		1,206	1,086
Other		601	405
Total deferred debits and other assets		9,765	8,753
Total assets		39,661	36,470
Current liabilities
Short-term borrowings		577	0
Accounts payable		1,010	647
Accrued expenses		415	384
Payables to affiliates, current		74	121
Customer deposits		108	99
Regulatory liabilities, current		226	185
Mark-to-market derivative liabilities, current		5	18
Other		191	133
Total current liabilities		2,606	1,587
Long-term debt		10,518	9,773
Long-term debt to financing trusts		205	205
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits		5,021	4,685
Regulatory liabilities, noncurrent		6,913	6,759
Asset retirement obligations, noncurrent		148	144
Non-pension postretirement benefits obligations		165	169
Mark-to-market derivative liabilities, noncurrent		79	201
Other		642	592
Total deferred credits and other liabilities		12,968	12,550
Total liabilities		26,297	24,115
Commitments and contingencies
Shareholders’ equity
Common Stock, Par or Stated Value Per Share		$ 12.50	$ 12.50
Common Stock, Shares Authorized		250,000,000	250,000,000
Common Stock, Shares, Outstanding		127,000,000	127,000,000
Common stock		$ 1,588	$ 1,588
Retained earnings/Undistributed earnings (losses)		2,030	1,691
Other paid-in capital		9,746	9,076
Total shareholders’ equity		13,364	12,355
Member’s equity
Total liabilities and equity		39,661	36,470
PECO Energy Co [Member]
Current assets
Cash and cash equivalents		59	36
Restricted cash and cash equivalents		9	8
Accounts receivable
Customer accounts receivable		635	489
Customer allowance for credit losses		(105)	(105)
Customer accounts receivable, net		530	384
Other accounts receivable		153	116
Other allowance for credit losses		(9)	(7)
Other accounts receivable, net		144	109
Receivables from affiliates, current		4	1
Inventories, net
Fossil fuel and emission allowances		99	51
Materials and supplies		52	45
Regulatory assets, current		80	48
Other		38	29
Total current assets		1,015	711
Accumulated depreciation and amortization		4,078	3,964
Property, plant and equipment, net		12,125	11,117
Deferred debits and other assets
Regulatory assets, noncurrent		652	943
Receivable from affiliates, noncurrent		0	597
Receivable related to Regulatory Agreement Units		237	0
Investments		30	34
Prepaid pension asset		413	386
Other		30	36
Total deferred debits and other assets		1,362	1,996
Total assets		14,502	13,824
Current liabilities
Short-term borrowings		239	0
Long-term debt due within one year		50	350
Accounts payable		668	494
Accrued expenses		142	136
Payables to affiliates, current		42	70
Customer deposits		63	48
Regulatory liabilities, current		75	94
Other		32	35
Total current liabilities		1,311	1,227
Long-term debt		4,562	3,847
Long-term debt to financing trusts		184	184
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits		2,213	2,421
Regulatory liabilities, noncurrent		270	635
Asset retirement obligations, noncurrent		28	29
Non-pension postretirement benefits obligations		286	286
Other		85	83
Total deferred credits and other liabilities		2,882	3,454
Total liabilities		8,939	8,712
Commitments and contingencies
Shareholders’ equity
Common Stock, No Par Value		$ 0	$ 0
Common Stock, Shares Authorized		500,000,000	500,000,000
Common Stock, Shares, Outstanding		170,000,000	170,000,000
Common stock		$ 3,702	$ 3,428
Retained earnings/Undistributed earnings (losses)		1,861	1,684
Total shareholders’ equity		5,563	5,112
Member’s equity
Total liabilities and equity		14,502	13,824
Baltimore Gas and Electric Company [Member]
Current assets
Cash and cash equivalents		43	51
Restricted cash and cash equivalents		24	4
Accounts receivable
Customer accounts receivable		617	436
Customer allowance for credit losses		(54)	(38)
Customer accounts receivable, net		563	398
Other accounts receivable		132	124
Other allowance for credit losses		(10)	(9)
Other accounts receivable, net		122	115
Receivables from affiliates, current		0	1
Inventories, net
Fossil fuel and emission allowances		91	42
Materials and supplies		65	53
Prepaid utility taxes		52	49
Regulatory assets, current		177	215
Other		13	8
Total current assets		1,150	936
Accumulated depreciation and amortization		4,583	4,299
Property, plant and equipment, net		11,338	10,577
Deferred debits and other assets
Regulatory assets, noncurrent		527	477
Investments		7	14
Prepaid pension asset		291	276
Other		37	44
Total deferred debits and other assets		862	811
Total assets		13,350	12,324
Current liabilities
Short-term borrowings		408	130
Long-term debt due within one year		300	250
Accounts payable		462	349
Accrued expenses		159	176
Payables to affiliates, current		39	48
Customer deposits		105	97
Regulatory liabilities, current		47	26
Other		55	48
Total current liabilities		1,575	1,124
Long-term debt		3,907	3,711
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits		1,832	1,686
Regulatory liabilities, noncurrent		816	934
Asset retirement obligations, noncurrent		30	26
Non-pension postretirement benefits obligations		166	175
Other		88	98
Total deferred credits and other liabilities		2,932	2,919
Total liabilities		8,414	7,754
Commitments and contingencies
Shareholders’ equity
Common Stock, No Par Value		$ 0	$ 0
Common Stock, Shares Authorized		1,500	1,500
Common Stock, Shares, Outstanding		1,000	1,000
Common stock	[1]	$ 2,861	$ 2,575
Retained earnings/Undistributed earnings (losses)		2,075	1,995
Total shareholders’ equity		4,936	4,570
Member’s equity
Total liabilities and equity		13,350	12,324
Pepco Holdings LLC [Member]
Current assets
Cash and cash equivalents		198	136
Restricted cash and cash equivalents		175	77
Accounts receivable
Customer accounts receivable		734	616
Customer allowance for credit losses		(109)	(104)
Customer accounts receivable, net		625	512
Other accounts receivable		300	283
Other allowance for credit losses		(46)	(39)
Other accounts receivable, net		254	244
Receivables from affiliates, current		2	2
Inventories, net
Fossil fuel and emission allowances		18	11
Materials and supplies		236	209
Regulatory assets, current		455	432
Other		96	69
Total current assets		2,059	1,692
Accumulated depreciation and amortization		2,618	2,108
Property, plant and equipment, net		17,686	16,498
Deferred debits and other assets
Regulatory assets, noncurrent		1,610	1,794
Goodwill		4,005	4,005
Investments		138	145
Prepaid pension asset		353	344
Other		231	266
Total deferred debits and other assets		6,337	6,554
Total assets		26,082	24,744
Current liabilities
Short-term borrowings		414	468
Long-term debt due within one year		591	399
Accounts payable		771	578
Accrued expenses		260	281
Payables to affiliates, current		66	104
Borrowings from Exelon/PHI intercompany money pool		44	7
Customer deposits		88	81
Regulatory liabilities, current		76	68
Unamortized energy contract liabilities, current		10	89
Contractual Obligation		87	0
Other		330	171
Total current liabilities		2,737	2,246
Long-term debt		7,529	7,148
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits		2,895	2,675
Regulatory liabilities, noncurrent		1,011	1,238
Asset retirement obligations, noncurrent		59	70
Non-pension postretirement benefits obligations		50	66
Unamortized energy contract liabilities, noncurrent		35	146
Other		536	570
Total deferred credits and other liabilities		4,586	4,765
Total liabilities		14,852	14,159
Commitments and contingencies
Shareholders’ equity
Retained earnings/Undistributed earnings (losses)		(352)	(210)
Member’s equity
Membership interest		11,582	10,795
Total member’s equity		11,230	10,585
Total equity		11,230	10,585
Total liabilities and equity		26,082	24,744
Potomac Electric Power Company [Member]
Current assets
Cash and cash equivalents		45	34
Restricted cash and cash equivalents		54	34
Accounts receivable
Customer accounts receivable		351	277
Customer allowance for credit losses		(47)	(37)
Customer accounts receivable, net		304	240
Other accounts receivable		180	160
Other allowance for credit losses		(25)	(16)
Other accounts receivable, net		155	144
Receivables from affiliates, current		0	0
Inventories, net
Inventories, net		135	119
Regulatory assets, current		235	213
Other		53	25
Total current assets		981	809
Accumulated depreciation and amortization		4,067	3,875
Property, plant and equipment, net		8,794	8,104
Deferred debits and other assets
Regulatory assets, noncurrent		437	532
Investments		119	120
Prepaid pension asset		273	279
Other		53	59
Total deferred debits and other assets		882	990
Total assets		10,657	9,903
Current liabilities
Short-term borrowings		299	175
Long-term debt due within one year		4	313
Accounts payable		382	272
Accrued expenses		125	160
Payables to affiliates, current		34	59
Customer deposits		39	35
Regulatory liabilities, current		6	14
Merger related obligation		26	27
Other		93	55
Total current liabilities		1,008	1,110
Long-term debt		3,747	3,132
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits		1,382	1,275
Regulatory liabilities, noncurrent		455	549
Asset retirement obligations, noncurrent		39	45
Non-pension postretirement benefits obligations		0	3
Other		244	314
Total deferred credits and other liabilities		2,120	2,186
Total liabilities		6,875	6,428
Commitments and contingencies
Shareholders’ equity
Common Stock, Par or Stated Value Per Share		$ 0.01	$ 0.01
Common Stock, Shares Authorized		200,000,000	200,000,000
Common Stock, Shares, Outstanding		100	100
Common stock	[2]	$ 2,767	$ 2,302
Retained earnings/Undistributed earnings (losses)		1,015	1,173
Total shareholders’ equity		3,782	3,475
Member’s equity
Total liabilities and equity		10,657	9,903
Delmarva Power & Light Company [Member]
Current assets
Cash and cash equivalents		31	28
Restricted cash and cash equivalents		121	43
Accounts receivable
Customer accounts receivable		204	149
Customer allowance for credit losses		(21)	(18)
Customer accounts receivable, net		183	131
Other accounts receivable		52	58
Other allowance for credit losses		(7)	(8)
Other accounts receivable, net		45	50
Receivables from affiliates, current		0	1
Inventories, net
Fossil fuel and emission allowances		18	11
Materials and supplies		58	54
Prepaid utility taxes		23	20
Regulatory assets, current		80	68
Other		14	16
Total current assets		573	422
Accumulated depreciation and amortization		1,772	1,635
Property, plant and equipment, net		4,820	4,560
Deferred debits and other assets
Regulatory assets, noncurrent		202	212
Prepaid pension asset		153	157
Other		54	61
Total deferred debits and other assets		409	430
Total assets		5,802	5,412
Current liabilities
Short-term borrowings		115	149
Long-term debt due within one year		584	83
Accounts payable		172	131
Accrued expenses		41	40
Payables to affiliates, current		22	33
Customer deposits		29	28
Regulatory liabilities, current		44	25
Other		136	59
Total current liabilities		1,143	548
Long-term debt		1,354	1,727
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits		869	803
Regulatory liabilities, noncurrent		380	441
Asset retirement obligations, noncurrent		13	16
Non-pension postretirement benefits obligations		9	11
Other		84	89
Total deferred credits and other liabilities		1,355	1,360
Total liabilities		3,852	3,635
Commitments and contingencies
Shareholders’ equity
Common Stock, Par or Stated Value Per Share		$ 2.25	$ 2.25
Common Stock, Shares Authorized		1,000	1,000
Common Stock, Shares, Outstanding		1,000	1,000
Common stock	[3]	$ 1,356	$ 1,209
Retained earnings/Undistributed earnings (losses)		594	568
Total shareholders’ equity		1,950	1,777
Member’s equity
Total liabilities and equity		5,802	5,412
Atlantic City Electric Company [Member]
Current assets
Cash and cash equivalents		72	29
Restricted cash and cash equivalents		0	0
Accounts receivable
Customer accounts receivable		179	190
Customer allowance for credit losses		(41)	(49)
Customer accounts receivable, net		138	141
Other accounts receivable		70	76
Other allowance for credit losses		(14)	(15)
Other accounts receivable, net		56	61
Receivables from affiliates, current		1	2
Inventories, net
Inventories, net		43	36
Regulatory assets, current		130	61
Other		3	3
Total current assets		443	333
Accumulated depreciation and amortization		1,551	1,420
Property, plant and equipment, net		3,990	3,729
Deferred debits and other assets
Regulatory assets, noncurrent		494	430
Prepaid pension asset		18	27
Other		34	37
Total deferred debits and other assets		546	494
Total assets		4,979	4,556
Current liabilities
Short-term borrowings		0	144
Long-term debt due within one year		3	3
Accounts payable		206	165
Accrued expenses		47	44
Payables to affiliates, current		26	31
Customer deposits		21	18
Regulatory liabilities, current		26	28
Contractual Obligation		87	0
Other		58	12
Total current liabilities		474	445
Long-term debt		1,754	1,579
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits		734	682
Regulatory liabilities, noncurrent		156	214
Non-pension postretirement benefits obligations		8	12
Other		100	49
Total deferred credits and other liabilities		998	957
Total liabilities		3,226	2,981
Commitments and contingencies
Shareholders’ equity
Common Stock, Par or Stated Value Per Share		$ 3	$ 3
Common Stock, Shares Authorized		25,000,000	25,000,000
Common Stock, Shares, Outstanding		9,000,000	9,000,000
Common stock		$ 1,765	$ 1,590
Retained earnings/Undistributed earnings (losses)		(12)	(15)
Total shareholders’ equity		1,753	1,575
Member’s equity
Total liabilities and equity		$ 4,979	$ 4,556

[1]In millions, shares round to zero. Number of shares is 1,500 authorized and 1,000 outstanding as of December 31, 2022 and 2021.[2]In millions, shares round to zero. Number of shares is 100 outstanding as of December 31, 2022 and 2021.[3]In millions, shares round to zero. Number of shares is 1,000 authorized and 1,000 outstanding as of December 31, 2022 and 2021.

Consolidated Statement of Chang

Consolidated Statement of Changes in Shareholders Equity - USD ($) shares in Thousands, $ in Millions	Total	Common Stock [Member]	Treasury Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss), net	Noncontrolling Interest [Member]	Commonwealth Edison Co [Member]	Commonwealth Edison Co [Member] Common Stock [Member]	Commonwealth Edison Co [Member] Retained Earnings [Member]	Commonwealth Edison Co [Member] Other Additional Capital [Member]	PECO Energy Co [Member]	PECO Energy Co [Member] Common Stock [Member]	PECO Energy Co [Member] Retained Earnings [Member]	Baltimore Gas and Electric Company [Member]	Baltimore Gas and Electric Company [Member] Common Stock [Member]	Baltimore Gas and Electric Company [Member] Retained Earnings [Member]	Pepco Holdings LLC [Member]	Pepco Holdings LLC [Member] Membership Interest [Member]	Pepco Holdings LLC [Member] Retained Earnings [Member]	Potomac Electric Power Company [Member]	Potomac Electric Power Company [Member] Common Stock [Member]	Potomac Electric Power Company [Member] Retained Earnings [Member]	Delmarva Power & Light Company [Member]	Delmarva Power & Light Company [Member] Common Stock [Member]	Delmarva Power & Light Company [Member] Retained Earnings [Member]	Atlantic City Electric Company [Member]	Atlantic City Electric Company [Member] Common Stock [Member]	Atlantic City Electric Company [Member] Retained Earnings [Member]
Beginning Balance (in shares) at Dec. 31, 2019	974,416
Beginning Balance at Dec. 31, 2019	$ 34,573	$ 19,274	$ (123)	$ 16,267	$ (3,194)	$ 2,349
Beginning Balance at Dec. 31, 2019																	$ 9,608	$ 9,618	$ (10)
Beginning Balance at Dec. 31, 2019							$ 10,677	$ 1,588	$ 1,517	$ 7,572	$ 4,178	$ 2,766	$ 1,412	$ 3,683	$ 1,907	$ 1,776				$ 2,907	$ 1,796	$ 1,111	$ 1,580	$ 977	$ 603	$ 1,283	$ 1,154	$ 129
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	$ 1,954			1,963		(9)	438		438		447		447	349		349	495		495	266		266	125		125	112		112
Long-Term Incentive Plan Activity (shares)	1,570
Long-Term Incentive Plan Activity	$ 40	40
Employee stock purchase plan issuances, shares	1,480
Employee stock purchase plan issuances	$ 56	56
Sale of noncontrolling interests	3	3
Changes in equity of noncontrolling interests	(57)					(57)
Proceeds from Issuance of Common Stock	0
Acquisition of CENG noncontrolling interest	$ 0
Common Stock, Dividends, Per Share, Declared	$ 1.53
Common stock dividends	$ (1,495)			(1,495)			(499)		(499)		(340)		(340)	(246)		(246)				(232)		(232)	(141)		(141)	(114)		(114)
Other Comprehensive Income (Loss), Net of Tax	$ (206)				(206)
Distributions to member																	(553)		(553)
Contributions from parent							713			713	248	248		411	411		494	494		262	262		112	112		117	117
Ending Balance (in shares) at Dec. 31, 2020	977,466
Ending Balance at Dec. 31, 2020	$ 34,868	19,373	(123)	16,735	(3,400)	2,283
Ending Balance at Dec. 31, 2020							11,329	1,588	1,456	8,285	4,533	3,014	1,519	4,197	2,318	1,879				3,203	2,058	1,145	1,676	1,089	587	1,398	1,271	127
Ending Balance at Dec. 31, 2020																	10,044	10,112	(68)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	$ 1,829			1,706		123	742		742		504		504	408		408	561		561	296		296	128		128	146		146
Long-Term Incentive Plan Activity (shares)	1,734
Long-Term Incentive Plan Activity	$ 69	69
Employee stock purchase plan issuances, shares	2,091
Employee stock purchase plan issuances	$ 90	90
Changes in equity of noncontrolling interests	(37)					(37)
Proceeds from Issuance of Common Stock	0
Acquisition of CENG noncontrolling interest	(885)	1,080				(1,965)
Deferred Tax Liability Adjustment - Noncontrolling Interest	$ (290)	(290)
Common Stock, Dividends, Per Share, Declared	$ 1.53
Common stock dividends	$ (1,499)			(1,499)			(507)		(507)		(339)		(339)	(292)		(292)				(268)		(268)	(147)		(147)	(288)		(288)
Payments to Noncontrolling Interests	0	2				(2)
Other Comprehensive Income (Loss), Net of Tax	$ 650				650
Distributions to member																	(703)		(703)
Contributions from parent							791			791	414	414		257	257		683	683		244	244		120	120		319	319
Ending Balance (in shares) at Dec. 31, 2021	981,291
Ending Balance at Dec. 31, 2021	$ 34,795	20,324	(123)	16,942	(2,750)	402
Ending Balance at Dec. 31, 2021	34,393						12,355	1,588	1,691	9,076	5,112	3,428	1,684	4,570	2,575	1,995				3,475	2,302	1,173	1,777	1,209	568	1,575	1,590	(15)
Ending Balance at Dec. 31, 2021																	10,585	10,795	(210)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	$ 2,171			2,170		1	917		917		576		576	380		380	608		608	305		305	169		169	148		148
Long-Term Incentive Plan Activity (shares)	561
Long-Term Incentive Plan Activity	$ 1	1
Employee stock purchase plan issuances, shares	983
Employee stock purchase plan issuances	$ 41	41
Changes in equity of noncontrolling interests	(7)					(7)
Distribution of Constellation	(11,573)	(21)		(13,179)	2,023	(396)
Proceeds from Issuance of Common Stock	$ 563	563
Stock Issued During Period, Shares, New Issues	12,995
Acquisition of CENG noncontrolling interest	$ 0
Common Stock, Dividends, Per Share, Declared	$ 1.35
Common stock dividends	$ (1,336)			(1,336)			(578)		(578)		(399)		(399)	(300)		(300)				(463)		(463)	(143)		(143)	(145)		(145)
Other Comprehensive Income (Loss), Net of Tax	$ 89				89
Distributions to member																	(750)		(750)
Contributions from parent							670			670	274	274		286	286		787	787		465	465		147	147		175	175
Ending Balance (in shares) at Dec. 31, 2022	995,830
Ending Balance at Dec. 31, 2022	$ 24,744	$ 20,908	$ (123)	$ 4,597	$ (638)	$ 0
Ending Balance at Dec. 31, 2022	$ 24,744						$ 13,364	$ 1,588	$ 2,030	$ 9,746	$ 5,563	$ 3,702	$ 1,861	$ 4,936	$ 2,861	$ 2,075				$ 3,782	$ 2,767	$ 1,015	$ 1,950	$ 1,356	$ 594	$ 1,753	$ 1,765	$ (12)
Ending Balance at Dec. 31, 2022																	$ 11,230	$ 11,582	$ (352)

Significant Accounting Policies

Significant Accounting Policies (All Registrants)	12 Months Ended
Significant Accounting Policies (All Registrants)	Dec. 31, 2022
Accounting Policies [Abstract]
Significant Accounting Policies (All Registrants)	Significant Accounting Policies (All Registrants) Description of Business (All Registrants) Exelon is a utility services holding company engaged in the energy distribution and transmission businesses through ComEd, PECO, BGE, Pepco, DPL, and ACE. On February 21, 2021, Exelon’s Board of Directors approved a plan to separate the Utility Registrants and Generation. The separation was completed on February 1, 2022, creating two publicly traded companies, Exelon and Constellation. See Note 2 — Discontinued Operations for additional information. Name of Registrant Business Service Territories Commonwealth Edison Company Purchase and regulated retail sale of electricity Northern Illinois, including the City of Chicago Transmission and distribution of electricity to retail customers PECO Energy Company Purchase and regulated retail sale of electricity and natural gas Southeastern Pennsylvania, including the City of Philadelphia (electricity) Transmission and distribution of electricity and distribution of natural gas to retail customers Pennsylvania counties surrounding the City of Philadelphia (natural gas) Baltimore Gas and Electric Company Purchase and regulated retail sale of electricity and natural gas Central Maryland, including the City of Baltimore (electricity and natural gas) Transmission and distribution of electricity and distribution of natural gas to retail customers Pepco Holdings LLC Utility services holding company engaged, through its reportable segments Pepco, DPL, and ACE Service Territories of Pepco, DPL, and ACE Potomac Electric Power Company Purchase and regulated retail sale of electricity District of Columbia, and major portions of Montgomery and Prince George’s Counties, Maryland. Transmission and distribution of electricity to retail customers Delmarva Power & Light Company Purchase and regulated retail sale of electricity and natural gas Portions of Delaware and Maryland (electricity) Transmission and distribution of electricity and distribution of natural gas to retail customers Portions of New Castle County, Delaware (natural gas) Atlantic City Electric Company Purchase and regulated retail sale of electricity Portions of Southern New Jersey Transmission and distribution of electricity to retail customers Basis of Presentation (All Registrants) This is a combined annual report of all Registrants. The Notes to the Consolidated Financial Statements apply to the Registrants as indicated parenthetically next to each corresponding disclosure. When appropriate, the Registrants are named specifically for their related activities and disclosures. Each of the Registrant’s Consolidated Financial Statements includes the accounts of its subsidiaries. All intercompany transactions have been eliminated, except for the historical transactions between the Utility Registrants and Generation for the purposes of presenting discontinued operations in all periods presented in the Consolidated Statements of Operations and Comprehensive Income. Through its business services subsidiary, BSC, Exelon provides its subsidiaries with a variety of support services at cost, including legal, human resources, financial, information technology, and supply management services. PHI also has a business services subsidiary, PHISCO, which provides a variety of support services at cost, including legal, finance, engineering, customer operations, distribution and transmission planning, asset management, system operations, and power procurement, to PHI operating companies. The costs of BSC and PHISCO are directly charged or allocated to the applicable subsidiaries. The results of Exelon’s corporate operations are presented as “Other” within the consolidated financial statements and include intercompany eliminations unless otherwise disclosed. As of December 31, 2022 and 2021, Exelon owned 100% of PECO, BGE, and PHI and more than 99% of ComEd. PHI owns 100% of Pepco, DPL, and ACE. As of December 31, 2021, Exelon owned 100% of Generation. As of February 1, 2022, as a result of the completion of the separation, Exelon no longer owns any interest in Generation. The separation of Constellation, including Generation and its subsidiaries, meets the criteria for discontinued operations and as such, its results of operations are presented as discontinued operations and have been excluded from continuing operations for all periods presented. Accounting rules require that certain BSC costs previously allocated to Generation be presented as part of Exelon’s continuing operations as these costs do not qualify as expenses of the discontinued operations. Comprehensive income, shareholders' equity, and cash flows related to Generation have not been segregated and are included in the Consolidated Statements of Operations and Comprehensive Income, Consolidated Statements of Changes in Shareholders’ Equity, and Consolidated Statements of Cash Flows, respectively, for all periods presented. See Note 2 — Discontinued Operations for additional information. The accompanying consolidated financial statements have been prepared in accordance with GAAP for annual financial statements and in accordance with the instructions to Form 10-K and Regulation S-X promulgated by the SEC. COVID-19 (All Registrants) The Registrants have taken steps to mitigate the potential risks posed by the global outbreak (pandemic) of the 2019 novel coronavirus (COVID-19). The Registrants provide a critical service to their customers and have taken measures to keep employees who operate the business safe and minimize unnecessary risk of exposure to the virus, including extra precautions for employees who work in the field. The Registrants have implemented work from home policies where appropriate and imposed travel limitations on employees. Management makes estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities as of the date of the financial statements and accompanying notes, and the amounts of revenues and expenses reported during the periods covered by those financial statements and accompanying notes. As of December 31, 2022 and 2021, and through the date of this report, management assessed certain accounting matters that require consideration of forecasted financial information, including, but not limited to, allowance for credit losses and the carrying value of goodwill and other long-lived assets, in context with the information reasonably available and the unknown future impacts of COVID-19. The Registrants' future assessment of the magnitude and duration of COVID-19, as well as other factors, could result in material impacts to their consolidated financial statements in future reporting periods. Use of Estimates (All Registrants) The preparation of financial statements of each of the Registrants in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Areas in which significant estimates have been made include, but are not limited to, the accounting for pension and OPEB, unbilled energy revenues, allowance for credit losses, inventory reserves, goodwill and long-lived asset impairment assessments, derivative instruments, unamortized energy contracts, fixed asset depreciation, environmental costs and other loss contingencies, AROs, and taxes. Actual results could differ from those estimates. Prior Period Adjustments and Reclassifications (Exelon, PHI, ACE) In the first quarter of 2022, management identified an error related to an overstatement of the regulatory liability associated with ACE’s mechanism to recover the cost of Transition Bonds issued in 2002 and 2003 by ACE Funding. Management has concluded that the error was not material to previously issued financial statements for Exelon, PHI or ACE. The error was corrected through a revision to ACE’s financial statements contained herein. The impact of the error correction was an $8 million increase to ACE’s opening Retained earnings as of January 1, 2021 with a corresponding reduction to Regulatory liabilities of $11 million and an increase to Deferred income taxes and unamortized investment tax credits of $3 million. The impact of the error to ACE’s Total operating revenues and Net income was less than $1 million for the year ended December 31, 2021. The error did not impact net cash flows provided by operating activities, net cash flows used in investing activities or net cash flows provided by financing activities for the year ended December 31, 2021. The error was corrected in the Exelon and PHI financial statements for the year ended December 31, 2022 as it was not material, resulting in an increase to Net income of $8 million. Regulatory Accounting (All Registrants) For their regulated electric and gas operations, the Registrants reflect the effects of cost-based rate regulation in their financial statements, which is required for entities with regulated operations that meet the following criteria: (1) rates are established or approved by a third-party regulator; (2) rates are designed to recover the entities’ cost of providing services or products; and (3) there is a reasonable expectation that rates designed to recover costs can be charged to and collected from customers. The Registrants account for their regulated operations in accordance with regulatory and legislative guidance from the regulatory authorities having jurisdiction, principally the ICC, PAPUC, MDPSC, DCPSC, DEPSC, and NJBPU, under state public utility laws and the FERC under various Federal laws. Regulatory assets and liabilities are amortized and the related expense or revenue is recognized in the Consolidated Statements of Operations consistent with the recovery or refund included in customer rates. The Registrants' regulatory assets and liabilities as of the balance sheet date are probable of being recovered or settled in future rates. If a separable portion of the Registrants' business was no longer able to meet the criteria discussed above, the affected entities would be required to eliminate from their consolidated financial statements the effects of regulation for that portion, which could have a material impact on their financial statements. See Note 3 — Regulatory Matters for additional information. With the exception of income tax-related regulatory assets and liabilities, the Registrants classify regulatory assets and liabilities with a recovery or settlement period greater than one year as both current and noncurrent in their Consolidated Balance Sheets, with the current portion representing the amount expected to be recovered from or refunded to customers over the next twelve-month period as of the balance sheet date. Income tax-related regulatory assets and liabilities are classified entirely as noncurrent in the Registrants’ Consolidated Balance Sheets to align with the classification of the related deferred income tax balances. The Registrants treat the impacts of a final rate order received after the balance sheet date but prior to the issuance of the financial statements as a non-recognized subsequent event, as the receipt of a final rate order is a separate and distinct event that has future impacts on the parties affected by the order. Revenues (All Registrants) Operating Revenues. The Registrants’ operating revenues generally consist of revenues from contracts with customers involving the sale and delivery of power and natural gas and utility revenues from ARP. The Registrants recognize revenue from contracts with customers to depict the transfer of goods or services to customers in an amount that the entities expect to be entitled to in exchange for those goods or services. The primary sources of revenue include regulated electric and natural gas tariff sales, distribution, and transmission services. At the end of each month, the Registrants accrue an estimate for the unbilled amount of energy delivered or services provided to customers. ComEd records ARP revenue for its best estimate of the electric distribution, energy efficiency, and transmission revenue impacts resulting from future changes in rates that ComEd believes are probable of approval by the ICC and FERC in accordance with its formula rate mechanisms. BGE, Pepco, DPL, and ACE record ARP revenue for their best estimate of the electric and natural gas distribution revenue impacts resulting from future changes in rates that they believe are probable of approval by the MDPSC, DCPSC, and/or NJBPU in accordance with their revenue decoupling mechanisms. PECO, BGE, Pepco, DPL, and ACE record ARP revenue for their best estimate of the transmission revenue impacts resulting from future changes in rates that they believe are probable of approval by FERC in accordance with their formula rate mechanisms. The companies recognize all ARP revenues that will be collected within 24 months of the end of the annual period in which they are recorded. See Note 3 — Regulatory Matters for additional information. Taxes Directly Imposed on Revenue-Producing Transactions. The Registrants collect certain taxes from customers such as sales and gross receipts taxes, along with other taxes, surcharges, and fees, that are levied by state or local governments on the sale or distribution of electricity and gas. Some of these taxes are imposed on the customer, but paid by the Registrants, while others are imposed on the Registrants. Where these taxes are imposed on the customer, such as sales taxes, they are reported on a net basis with no impact to the Consolidated Statements of Operations and Comprehensive Income. However, where these taxes are imposed on the Registrants, such as gross receipts taxes or other surcharges or fees, they are reported on a gross basis. Accordingly, revenues are recognized for the taxes collected from customers along with an offsetting expense. Se e Note 22 — Supplemental Financial Information for taxes that are presented on a gross basis. Leases (All Registrants) The Registrants recognize a ROU asset and lease liability for operating and finance leases with a term of greater than one year. Operating lease ROU assets are included in Other deferred debits and other assets and operating lease liabilities are included in Other current liabilities and Other deferred credits and other liabilities on the Consolidated Balance Sheets. Finance lease ROU assets are included in Plant, property, and equipment, net and finance lease liabilities are included in Long-term debt due within one year and Long-term debt on the Consolidated Balance Sheets. The ROU asset is measured as the sum of (1) the present value of all remaining fixed and in-substance fixed payments using the rate implicit in the lease whenever that is readily determinable or each Registrant’s incremental borrowing rate, (2) any lease payments made at or before the commencement date (less any lease incentives received), and (3) any initial direct costs incurred. The lease liability is measured the same as the ROU asset, but excludes any payments made before the commencement date and initial direct costs incurred. Lease terms include options to extend or terminate the lease if it is reasonably certain they will be exercised. The Registrants include non-lease components for most asset classes, which are service-related costs that are not integral to the use of the asset, in the measurement of the ROU asset and lease liability. Expense for operating leases and leases with a term of one year or less is recognized on a straight-line basis over the term of the lease, unless another systematic and rational basis is more representative of the derivation of benefit from use of the leased property. Variable lease payments are recognized in the period in which the related obligation is incurred. Operating lease expense, finance lease expense, and variable lease payments are primarily recorded to Operating and maintenance expense on the Registrants’ Statements of Operations and Comprehensive Income. Income from operating leases, including subleases, is recognized on a straight-line basis over the term of the lease, unless another systematic and rational basis is more representative of the pattern in which income is earned over the term of the lease. Variable lease income is recognized in the period in which the related obligation is performed. Operating lease income and variable lease income are recorded to Operating revenues on the Registrants’ Statements of Operations and Comprehensive Income. The Registrants’ operating and finance leases consist primarily of real estate including office buildings and vehicles and equipment. The Registrants account for land right arrangements that provide for exclusive use as leases while shared use land arrangements are generally not leases. The Registrants do not account for secondary use pole attachments as leases. See Note 10 — Leases for additional information. Income Taxes (All Registrants) Deferred federal and state income taxes are recorded on significant temporary differences between the book and tax basis of assets and liabilities and for tax benefits carried forward. Investment tax credits have been deferred in the Registrants’ Consolidated Balance Sheets and are recognized in book income over the life of the related property. The Registrants account for uncertain income tax positions using a benefit recognition model with a two-step approach; a more-likely-than-not recognition criterion; and a measurement approach that measures the position as the largest amount of tax benefit that is greater than 50% likely of being realized upon ultimate settlement. If it is not more-likely-than-not that the benefit of the tax position will be sustained on its technical merits, no benefit is recorded. Uncertain tax positions that relate only to timing of when an item is included on a tax return are considered to have met the recognition threshold. The Registrants recognize accrued interest related to unrecognized tax benefits in Interest expense, net or Other, net (interest income) and recognize penalties related to unrecognized tax benefits in Other, net in their Consolidated Statements of Operations and Comprehensive Income. Cash and Cash Equivalents (All Registrants) The Registrants consider investments purchased with an original maturity of three months or less to be cash equivalents. Restricted Cash and Cash Equivalents (All Registrants) Restricted cash and cash equivalents represent funds that are restricted to satisfy designated current liabilities. As of December 31, 2022 and 2021, the Registrants' restricted cash and cash equivalents primarily represented the following items: Registrant Description Exelon Payment of medical, dental, vision, and long-term disability benefits, in addition to the items listed below for the Utility Registrants. ComEd Collateral held from suppliers associated with energy and REC procurement contracts, any over-recovered RPS costs and alternative compliance payments received from RES pursuant to FEJA, and costs for the remediation of an MGP site. PECO Proceeds from the sales of assets that were subject to PECO’s mortgage indenture. BGE Proceeds from the loan program for the completion of certain energy efficiency measures and collateral held from energy suppliers. PHI (a) Payment of merger commitments, collateral held from its energy suppliers associated with procurement contracts, and repayment of Transition Bonds Pepco Payment of merger commitments and collateral held from energy suppliers. DPL Collateral held from energy suppliers. ACE (a) Repayment of Transition Bonds __________ (a) As of December 31, 2021, the Transition Bonds were fully redeemed. Restricted cash and cash equivalents not available to satisfy current liabilities are classified as noncurrent assets. As of December 31, 2022 and 2021, the Registrants' noncurrent restricted cash and cash equivalents primarily represented ComEd’s over-recovered RPS costs and alternative compliance payments received from RES pursuant to FEJA and costs for the remediation of an MGP site. See Note 16 — Debt and Credit Agreements and Note 22 — Supplemental Financial Information for additional information. Allowance for Credit Losses on Accounts Receivables (All Registrants) The allowance for credit losses reflects the Registrants’ best estimates of losses on the customers' accounts receivable balances based on historical experience, current information, and reasonable and supportable forecasts. The allowance for credit losses is developed by applying loss rates for each Utility Registrant, based on historical loss experience, current conditions, and forward-looking risk factors, to the outstanding receivable balance by customer risk segment. Utility Registrants' customer accounts are written off consistent with approved regulatory requirements. Adjustments to the allowance for credit losses are primarily recorded to Operating and maintenance expense on the Registrants' Consolidated Statements of Operations and Comprehensive Income or Regulatory assets and liabilities on the Registrants' Consolidated Balance Sheets. See Note 3 - Regulatory Matters for additional information regarding the regulatory recovery of credit losses on customer accounts receivable. The Registrants have certain non-customer receivables in Other deferred debits and other assets which primarily are with governmental agencies and other high-quality counterparties with no history of default. As such, the allowance for credit losses related to these receivables is not material. The Registrants monitor these balances and will record an allowance if there are indicators of a decline in credit quality. See Note 6 — Accounts Receivable for additional information. Inventories (All Registrants) Inventory is recorded at the lower of weighted average cost or net realizable value. Provisions are recorded for excess and obsolete inventory. Fossil fuel and materials and supplies are generally included in inventory when purchased. Fossil fuel is expensed to Purchased power and fuel expense when used or sold. Materials and supplies generally includes transmission and distribution materials and are expensed to Operating and maintenance or capitalized to Property, plant, and equipment, as appropriate, when installed or used. Property, Plant, and Equipment (All Registrants) Property, plant, and equipment is recorded at original cost. Original cost includes construction-related direct labor and material costs and indirect construction costs including labor and related costs of departments associated with supporting construction activities. When appropriate, original cost also includes AFUDC for regulated property at the Utility Registrants. The cost of repairs and maintenance and minor replacements of property is charged to Operating and maintenance expense as incurred. Third parties reimburse the Utility Registrants for all or a portion of expenditures for certain capital projects. Such contributions in aid of construction costs (CIAC) are recorded as a reduction to Property, plant, and equipment, net. Upon retirement, the cost of property, net of salvage, is charged to accumulated depreciation consistent with the composite and group methods of depreciation. Depreciation expense at ComEd, BGE, Pepco, DPL, and ACE includes the estimated cost of dismantling and removing plant from service upon retirement. Actual incurred removal costs are applied against a related regulatory liability or recorded to a regulatory asset if in excess of previously collected removal costs. PECO’s removal costs are capitalized to accumulated depreciation when incurred and recorded to depreciation expense over the life of the new asset constructed consistent with PECO’s regulatory recovery method. Capitalized Software. Certain costs, such as design, coding, and testing incurred during the application development stage of software projects that are internally developed or purchased for operational use are capitalized within Property, plant, and equipment. Similar costs incurred for cloud-based solutions treated as service arrangements are capitalized within Other Current Assets and Deferred Debits and Other Assets. Such capitalized amounts are amortized ratably over the expected lives of the projects when they become operational, generally not to exceed five years. Certain other capitalized software costs are being amortized over longer lives based on the expected life or pursuant to prescribed regulatory requirements. AFUDC. AFUDC is the cost, during the period of construction, of debt and equity funds used to finance construction projects for regulated operations. AFUDC is recorded to construction work in progress and as a non-cash credit to an allowance that is included in interest expense for debt-related funds and other income and deductions for equity-related funds. The rates used for capitalizing AFUDC are computed under a method prescribed by regulatory authorities. See Note 7 — Property, Plant, and Equipment, Note 8 — Jointly Owned Electric Utility Plant and Note 22 — Supplemental Financial Information for additional information. Depreciation and Amortization (All Registrants) Depreciation is generally recorded over the estimated service lives of property, plant, and equipment on a straight-line basis using the group or composite methods of depreciation. The group approach is typically for groups of similar assets that have approximately the same useful lives and the composite approach is used for dissimilar assets that have different lives. Under both methods, a reporting entity depreciates the assets over the average life of the assets in the group. ComEd, BGE, Pepco, DPL, and ACE's depreciation expense includes the estimated cost of dismantling and removing plant from service upon retirement, which is consistent with each utility's regulatory recovery method. PECO's removal costs are capitalized to accumulated depreciation when incurred and recorded to depreciation expense over the life of the new asset constructed consistent with PECO's regulatory recovery method. The estimated service lives for the Registrants are based on a combination of depreciation studies and historical retirements. See Note 7 — Property, Plant, and Equipment for additional information regarding depreciation. Amortization of regulatory assets and liabilities are recorded over the recovery or refund period specified in the related legislation or regulatory order or agreement. When the recovery or refund period is less than one year, amortization is recorded to the line item in which the deferred cost or income would have originally been recorded in the Registrants’ Consolidated Statements of Operations and Comprehensive Income. Amortization of ComEd’s electric distribution and energy efficiency formula rate regulatory assets and the Utility Registrants' transmission formula rate regulatory assets is recorded to Operating revenues. Amortization of income tax related regulatory assets and liabilities is generally recorded to Income tax expense. Except for the regulatory assets and liabilities discussed above, amortization is generally recorded to Depreciation and amortization in the Registrants’ Consolidated Statements of Operations and Comprehensive Income when the recovery period is more than one year. See Note 3 — Regulatory Matters and Note 22 — Supplemental Financial Information for additional information regarding the amortization of the Registrants' regulatory assets. Asset Retirement Obligations (All Registrants) The Registrants estimate and recognize a liability for their legal obligation to perform asset retirement activities even though the timing and/or methods of settlement may be conditional on future events. The Registrants update their AROs either annually or on a rotational basis at least once every three years, based on a risk profile, unless circumstances warrant more frequent updates. The updates factor in new cost estimates, credit-adjusted, risk-free rates (CARFR) and escalation rates, and the timing of cash flows. AROs are accreted throughout each year to reflect the time value of money for these present value obligations through an increase to regulatory assets. See Note 9 — Asset Retirement Obligations for additional information. Guarantees (All Registrants) If necessary, the Registrants recognize a liability at the time of issuance of a guarantee for the fair value of the obligations they have undertaken by issuing the guarantee. The liability is reduced or eliminated as the Registrants are released from risk under the guarantee. Depending on the nature of the guarantee, the release from risk of the Registrant may be recognized only upon the expiration or settlement of the guarantee or by a systematic and rational amortization method over the term of the guarantee. See Note 18 — Commitments and Contingencies for additional information. Asset Impairments Long-Lived Assets (All Registrants). The Registrants evaluate the carrying value of long-lived assets for recoverability whenever events or changes in circumstances indicate that the carrying value of those assets may not be recoverable. Indicators of impairment may include specific regulatory disallowance, abandonment, or plans to dispose of a long-lived asset significantly before the end of its useful life. When the estimated undiscounted future cash flows attributable to the long-lived asset may not be recoverable, the amount of the impairment loss is determined by measuring the excess of the carrying amount of the long-lived asset over its fair value. Goodwill (Exelon, ComEd, and PHI). Goodwill represents the excess of the purchase price paid over the estimated fair value of the net assets acquired and liabilities assumed in the acquisition of a business. Goodwill is not amortized but is assessed for impairment at least annually or on an interim basis if an event occurs or circumstances change that would more likely than not reduce the fair value of a reporting unit below its carrying value. See Note 12 — Intangible Assets for additional information. Derivative Financial Instruments (All Registrants) Derivatives are recognized on the balance sheet at their fair value unless they qualify for certain exceptions, including NPNS. For derivatives that qualify and are designated as cash flow hedges, changes in fair value each period are initially recorded in AOCI and recognized in earnings when the underlying hedged transaction affects earnings. Amounts recognized in earnings are recorded in Interest expense, net on the Consolidated Statement of Operations and Comprehensive Income based on the activity the transaction is economically hedging. Cash inflows and outflows related to derivative instruments designated as cash flow hedges are included as a component of operating, investing, or financing cash flows in the Consolidated Statements of Cash Flows, depending on the nature of each transaction. For derivatives intended to serve as economic hedges, which are not designated for hedge accounting, changes in fair value each period are recognized in earnings or as a regulatory asset or liability each period. Amounts recognized in earnings are recorded in Electric operating revenues, Purchased power and fuel, or Interest expense in the Consolidated Statements of Operations and Comprehensive Income based on the activity the transaction is economically hedging. Changes in fair value are also recorded as a regulatory asset or liability when there is an ability to recover or return the associated costs or benefits in accordance with regulatory requirements. Cash inflows and outflows related to derivative instruments are included as a component of operating, investing, or financing cash flows in the Consolidated Statements of Cash Flows, depending on the nature of the hedged item. See Note 3 — Regulatory Matters and Note 15 — Derivative Financial Instruments for additional information. Retirement Benefits (All Registrants) Exelon sponsors defined benefit pension plans and OPEB plans for substantially all current employees. The plan obligations and costs of providing benefits under these plans are measured as of December 31. The measurement involves various factors, assumptions, and accounting elections. The impact of assumption changes or experience different from that assumed on pension and OPEB obligations is recognized over time rather than immediately recognized in the Consolidated Statements of Operations and Comprehensive Income. Gains or losses in excess of the greater of ten percent of the projected benefit obligation or the MRV of plan assets are amortized over the e

Discontinued Operations (Exelon

Discontinued Operations (Exelon)	12 Months Ended
Discontinued Operations (Exelon)	Dec. 31, 2022
Discontinued Operations and Disposal Groups [Abstract]
Discontinued Operations (Exelon)	Discontinued Operations (Exelon) On February 21, 2021, Exelon's Board of Directors approved a plan to separate the Utility Registrants and Generation, creating two publicly traded companies ("the separation"). Exelon completed the separation on February 1, 2022, through the distribution of 326,663,937 common stock shares of Constellation, the new publicly traded company, to Exelon shareholders. Under the separation plan, Exelon shareholders retained their current shares of Exelon stock and received one share of Constellation common stock for every three shares of Exelon common stock held on January 20, 2022, the record date for the distribution, in a transaction that was tax-free to Exelon and its shareholders for U.S. federal income tax purposes. Constellation was newly formed and incorporated in Pennsylvania on June 15, 2021 for the purposes of separation and holds Generation (including Generation's subsidiaries). Pursuant to the separation: • Exelon entered into four term loans consisting of a 364-day term loan for $1.15 billion and three 18-month term loans for $300 million, $300 million and $250 million, respectively. Exelon issued these term loans primarily to fund the cash payment to Constellation and for general corporate purposes. See Note 16 — Debt and Credit Agreements for additional information. • Exelon made a cash payment of $1.75 billion to Constellation on January 31, 2022. • Exelon contributed its equity ownership interest in Generation to Constellation. Exelon no longer retains any equity ownership interest in Generation or Constellation. • Exelon transferred certain corporate assets and employee-related obligations to Constellation. • Exelon received cash from Generation of $258 million to settle the intercompany loan on January 31, 2022. See Note 16 — Debt and Credit Agreements for additional information. Continuing Involvement In order to govern the ongoing relationships between Exelon and Constellation after the separation, and to facilitate an orderly transition, Exelon and Constellation have entered into several agreements, including the following: • Separation Agreement – governs the rights and obligations between Exelon and Constellation regarding certain actions to be taken in connection with the separation, among others, including the allocation of assets and liabilities between Exelon and Constellation. • Transition Services Agreement (TSA) – governs the terms and conditions of the services that Exelon will provide to Constellation and Constellation will provide to Exelon for an expected period of two years, provided that certain services may be longer than the term and services may be extended with approval from both parties. The services include specified accounting, finance, information technology, human resources, employee benefits, and other services that have historically been provided on a centralized basis by BSC. For the period from February 1, 2022 to December 31, 2022, the amounts Exelon billed Constellation and Constellation billed Exelon for these services were $266 million recorded in Other income, net and $43 million recorded in Operating and maintenance expense, respectively. • Tax Matters Agreement (TMA) – governs the respective rights, responsibilities and obligations of Exelon and Constellation with respect to all tax matters, including tax liabilities and benefits, tax attributes, tax returns, tax contests and other tax sharing regarding U.S. federal, state, local and foreign income taxes, other tax matters and related tax returns. See Note 13 — Income Taxes for additional Information. In addition, the Utility Registrants will continue to incur expenses from transactions with Constellation after the separation. Prior to the separation, such expenses were primarily recorded as Purchased power from affiliates and an immaterial amount recorded as Operating and maintenance expense from affiliates at the Utility Registrants. After the separation, such expenses are primarily recorded as Purchased power and an immaterial amount recorded as Operating and maintenance expense at the Utility Registrants. • ComEd had an ICC-approved RFP contract with Constellation to provide a portion of ComEd’s electric supply requirements. ComEd also purchased RECs and ZECs from Constellation. • PECO received electric supply from Constellation under contracts executed through PECO’s competitive procurement process. In addition, PECO had a ten-year agreement with Constellation to sell solar AECs. • BGE received a portion of its energy requirements from Constellation under its MDPSC-approved market-based SOS and gas commodity programs. • Pepco received electric supply from Constellation under contracts executed through Pepco’s competitive procurement process approved by the MDPSC and DCPSC. • DPL received a portion of its energy requirements from Constellation under its MDPSC and DEPSC approved market-based SOS commodity programs. • ACE received electric supply from Constellation under contracts executed through ACE’s competitive procurement process approved by the NJBPU. ComEd and PECO also have receivables with Constellation for estimated excess funds at the end of decommissioning the Regulatory Agreement Units, such amounts are due back to ComEd and PECO, as applicable, for payment to their respective customers. See Note 3 — Regulatory Matters and Note 23 — Related Party Transactions for additional information. Discontinued Operations The separation represented a strategic shift that would have a major effect on Exelon’s operations and financial results. Accordingly, the separation meets the criteria for discontinued operations. The following table presents the results of Constellation that have been reclassified from continuing operations and included in discontinued operations within Exelon’s Consolidated Statements of Operations and Comprehensive Income for the years ended December 31, 2022, 2021, and 2020. These results are primarily Generation, which is comprised of Exelon’s Mid-Atlantic, Midwest, New York, ERCOT, and Other Power Regions reportable segments, and include the impact of transaction costs, certain BSC costs, including any transition costs, that were historically allocated and directly attributable to Generation, transactions between Generation and the Utility Registrants, and tax-related adjustments. Transaction costs include costs for external bankers, accountants, appraisers, lawyers, external counsels and other advisors, among others, who were involved in the negotiation, appraisal, due diligence and regulatory approval of the separation. Transition costs are primarily employee-related costs such as recruitment expenses, costs to establish certain stand-alone functions and information technology systems, professional services fees, and other separation-related costs during the transition to separate Generation. For the purposes of reporting discontinued operations, these results also include transactions between Generation and the Utility Registrants that were historically eliminated within Exelon’s Consolidated Statements of Operations, as these transactions will be ongoing after the separation. Certain BSC costs that were historically allocated to Generation are presented as part of continuing operations in Exelon’s Consolidated Statements of Operations as these costs do not qualify as expenses of the discontinued operations per the accounting rules. For the Years Ended December 31, 2022 2021 2020 Operating revenues Competitive business revenues $ 1,855 $ 18,466 $ 16,399 Competitive business revenues from affiliates 161 1,189 1,206 Total operating revenues 2,016 19,655 17,605 Operating expenses Competitive businesses purchased power and fuel 1,138 12,163 9,585 Operating and maintenance (a) 371 4,174 4,794 Depreciation and amortization 94 3,003 2,123 Taxes other than income taxes 44 475 482 Total operating expenses 1,647 19,815 16,984 Gain on sales of assets and businesses 10 201 11 Operating income 379 41 632 Other income and (deductions) Interest expense, net (20) (282) (328) Other, net (281) 795 937 Total other (deductions) and income (301) 513 609 Income before income taxes 78 554 1,241 Income taxes (40) 332 380 Equity in losses of unconsolidated affiliates (1) (9) (6) Net income 117 213 855 Net income (loss) attributable to noncontrolling interests 1 123 (9) Net income from discontinued operations $ 116 $ 90 $ 864 __________ (a) Includes transaction and transition costs related to the separation of $52 million and $43 million for the years ended December 31, 2022 and 2021, respectively. There were no separation related costs incurred in 2020. See discussion above for additional information. There were no assets and liabilities of discontinued operations included in Exelon's Consolidated Balance Sheet as of December 31, 2022. Constellation had net assets of $11,573 million that separated on February 1, 2022 that resulted in a reduction to Exelon's equity during the year ended December 31, 2022. Refer to the Distribution of Constellation line in Exelon's Consolidated Statement of Changes in Shareholders' Equity for further information. The following table presents the assets and liabilities of discontinued operations in Exelon’s Consolidated Balance Sheets as of December 31, 2021. December 31, 2021 ASSETS Current assets Cash and cash equivalents $ 510 Restricted cash and cash equivalents 72 Accounts receivable Customer accounts receivable 1,724 Customer allowance for credit losses (55) Customer accounts receivable, net 1,669 Other accounts receivable 596 Other allowance for credit losses (4) Other accounts receivable, net 592 Mark-to-market derivative assets 2,169 Inventories, net Fossil fuel and emission allowances 284 Materials and supplies 1,004 Renewable energy credits 529 Assets held for sale 13 Other 993 Total current assets of discontinued operations 7,835 Property, plant, and equipment (net of accumulated depreciation and amortization of $15,888) 19,661 Deferred debits and other assets Nuclear decommissioning trust funds 15,938 Investments 193 Mark-to-market derivative assets 949 Other 1,768 Total property, plant, and equipment, deferred debits, and other assets of discontinued operations 38,509 Total assets of discontinued operations $ 46,344 December 31, 2021 LIABILITIES AND SHAREHOLDERS’ EQUITY Current liabilities Short-term borrowings $ 2,082 Long-term debt due within one year 1,220 Accounts payable 1,757 Accrued expenses 818 Mark-to-market derivative liabilities 981 Renewable energy credit obligation 779 Liabilities held for sale 3 Other 300 Total current liabilities of discontinued operations 7,940 Long-term debt 4,575 Deferred credits and other liabilities Deferred income taxes and unamortized investment tax credits 3,583 Asset retirement obligations 12,819 Pension obligations 939 Non-pension postretirement benefit obligations 876 Spent nuclear fuel obligation 1,210 Mark-to-market derivative liabilities 513 Other 1,161 Total long-term debt, deferred credits, and other liabilities of discontinued operations 25,676 Total liabilities of discontinued operations $ 33,616 The following table presents selected financial information regarding cash flows of the discontinued operations that are included within Exelon’s Consolidated Statements of Cash Flows for the years ended December 31, 2022, 2021, and 2020. For the Years Ended December 31, 2022 2021 2020 Non-cash items included in net income from discontinued operations: Depreciation, amortization, and accretion, including nuclear fuel and energy contract amortization $ 207 $ 4,540 $ 3,636 Asset impairments — 545 563 Loss (gain) on sales of assets and businesses 9 (201) (11) Deferred income taxes and amortization of investment tax credits (143) (224) 94 Net fair value changes related to derivatives (59) (568) (270) Net realized and unrealized losses (gains) on NDT fund investments 205 (586) (461) Net unrealized losses (gains) on equity investments 16 160 (186) Other decommissioning-related activity 36 (946) (659) Cash flows from investing activities: Capital expenditures (227) (1,341) (1,759) Collection of DPP 169 3,902 3,771 Supplemental cash flow information: (Decrease) increase in capital expenditures not paid (128) 96 (88) Increase in DPP 348 3,652 4,441 Increase in PP&E related to ARO update 335 618 850

Regulatory Matters (All Registr

Regulatory Matters (All Registrants)	12 Months Ended
Regulatory Matters (All Registrants)	Dec. 31, 2022
Regulated Operations [Abstract]
Regulatory Matters (All Registrants)	Regulatory Matters (All Registrants) The following matters below discuss the status of material regulatory and legislative proceedings of the Registrants. Distribution Base Rate Case Proceedings The following tables show the completed and pending distribution base rate case proceedings in 2022. Completed Distribution Base Rate Case Proceedings Registrant/Jurisdiction Filing Date Service Requested Revenue Requirement Increase Approved Revenue Requirement Increase Approved ROE Approval Date Rate Effective Date ComEd - Illinois (a) April 16, 2021 Electric $ 51 $ 46 7.36% December 1, 2021 January 1, 2022 April 15, 2022 Electric 199 199 7.85% November 17, 2022 January 1, 2023 PECO - Pennsylvania March 30, 2021 Electric 246 132 N/A (b) November 18, 2021 January 1, 2022 March 31, 2022 Natural Gas 82 55 October 27, 2022 January 1, 2023 BGE - Maryland (c) May 15, 2020 (amended September 11, 2020) Electric 203 140 9.50% December 16, 2020 January 1, 2021 Natural Gas 108 74 9.65% Pepco - District of Columbia (d) May 30, 2019 (amended June 1, 2020) Electric 136 109 9.275% June 8, 2021 July 1, 2021 Pepco - Maryland (e) October 26, 2020 (amended March 31, 2021) Electric 104 52 9.55% June 28, 2021 June 28, 2021 DPL - Maryland September 1, 2021 (amended December 23, 2021) (f) Electric 27 13 9.60% March 2, 2022 March 2, 2022 May 19, 2022 (g) Electric 38 29 9.60% December 14, 2022 January 1, 2023 DPL - Delaware January 14, 2022 (amended August 15, 2022) Natural Gas 13 8 9.60% October 12, 2022 August 14, 2022 ACE - New Jersey (h) December 9, 2020 (amended February 26, 2021) Electric 67 41 9.60% July 14, 2021 January 1, 2022 __________ (a) Pursuant to EIMA and FEJA, ComEd’s electric distribution rates are established through a performance-based formula, which sunsets at the end of 2022. See discussion of CEJA below for details on the transition away from the electric distribution formula rate. The electric distribution formula rate includes decoupling provisions and, as a result, ComEd's electric distribution formula rate revenues are not impacted by abnormal weather, usage per customer, or number of customers. Under the performance-based formula, ComEd filed annual updates to its electric distribution formula rate on or before May 1 st , with resulting rates effective in January of the following year. ComEd’s annual electric distribution formula rate update is based on prior year actual costs and current year projected capital additions (initial year revenue requirement). The update also reconciles any differences between the revenue requirement in effect for the prior year and actual costs incurred from the year (annual reconciliation). ComEd’s 2022 approved revenue requirement reflects an increase of $37 million for the initial year revenue requirement for 2022 and an increase of $9 million related to the annual reconciliation for 2020. The revenue requirement for 2022 provides for a weighted average debt and equity return on distribution rate base of 5.72% inclusive of an allowed ROE of 7.36%, reflecting the monthly average yields for 30-year treasury bonds plus 580 basis points . The reconciliation revenue requirement for 2020 provides for a weighted average debt and equity return on distribution rate base of 5.69%, inclusive of an allowed ROE of 7.29%, reflecting the monthly yields on 30-year treasury bonds plus 580 basis points less a performance metrics penalty of 7 basis points. ComEd’s 2023 approved revenue requirement above reflects an increase of $144 million for the initial year revenue requirement for 2023 and an increase of $55 million related to the annual reconciliation for 2021. The revenue requirement for 2023 provides for a weighted average debt and equity return on distribution rate base of 5.94% inclusive of an allowed ROE of 7.85%, reflecting the monthly average yields for 30-year treasury bonds plus 580 basis points. The reconciliation revenue requirement for 2021 provides for a weighted average debt and equity return on distribution rate base of 5.91%, inclusive of an allowed ROE of 7.78%, reflecting the monthly yields on 30-year treasury bonds plus 580 basis points less a performance metrics penalty of 7 basis points. This is ComEd's last performance-based electric distribution formula rate update filing under EIMA. See discussion of CEJA below for details on the transition away from the electric distribution formula rate. (b) The PECO electric and natural gas base rate case proceedings were resolved through settlement agreements, which did not specify an approved ROE. (c) Reflects a three-year cumulative multi-year plan for 2021 through 2023. BGE proposed to use certain tax benefits to fully offset the increases in 2021 and 2022 and partially offset the increase in 2023. The MDPSC awarded BGE electric revenue requirement increases of $59 million, $39 million, and $42 million, before offsets, in 2021, 2022, and 2023, respectively, and natural gas revenue requirement increases of $53 million, $11 million, and $10 million, before offsets, in 2021, 2022, and 2023, respectively. However, the MDPSC utilized the tax benefits to fully offset the increases in 2021 and January 2022 such that customer rates remained unchanged. For the remainder of 2022, the MDPSC chose to offset only 25% of the cumulative 2021 and 2022 electric revenue requirement increases and 50% of the cumulative gas revenue requirement i ncreases. In 2021, the MDPSC deferred a decision on whether to use certain tax benefits to offset the revenue requirement increases in 2023 and directed BGE to make another proposal at the end of 2022. In September 2022 BGE proposed that tax benefits not be used to offset the 2023 revenue requirement increases. On October 26, 2022, the MDPSC accepted BGE's recommendation to not use tax benefits to offset the 2023 revenue requirement increases . (d) Reflects a cumulative multi-year plan with 18-months remaining in 2021 through 2022. The DCPSC awarded Pepco electric incremental revenue requirement increases of $42 million and $67 million, before offsets, for 2021 and 2022, respectively. However, the DCPSC utilized the acceleration of refunds for certain tax benefits along with other rate relief to partially offset the customer rate increases by $22 million and $40 million for 2021 and 2022, respectively. (e) Reflects a three-year cumulative multi-year plan for April 1, 2021 through March 31, 2024. The MDPSC awarded Pepco electric incremental revenue requirement increases of $21 million, $16 million, and $15 million, before offsets, for the 12-month periods ending March 31, 2022, 2023, and 2024, respectively. Pepco proposed to utilize certain tax benefits to fully offset the increase through 2023 and partially offset customer rate increases in 2024. However, the MDPSC only utilized the acceleration of refunds for certain tax benefits to fully offset the increases such that customer rates remain unchanged through March 31, 2022. On February 23, 2022, the MDPSC chose to offset 25% of the cumulative revenue requirement increase through March 31, 2023. Whether certain tax benefits will be used to offset the customer rate increases for the twelve months ended March 31, 2024 has not been decided, and Pepco cannot predict the outcome. (f) The approved settlement reflects a 9.60% ROE, which is solely for the purposes of calculating AFUDC and regulatory asset carrying costs. (g) Reflects a three-year cumulative multi-year plan for January 1, 2023 through December 31, 2025. The MDPSC awarded DPL electric incremental revenue requirement increases of $17 million, $6 million, and $6 million for 2023, 2024, and 2025, respectively. (h) Requested and approved increases are before New Jersey sales and use tax. The order allows ACE to retain approximately $11 million of certain tax benefits which resulted in a decrease to income tax expense in Exelon's, PHI's, and ACE's Consolidated Statements of Operations and Comprehensive Income in the third quarter of 2021. Pending Distribution Base Rate Case Proceedings Registrant/Jurisdiction Filing Date Service Requested Revenue Requirement Increase Requested ROE Expected Approval Timing ComEd - Illinois (a) January 17, 2023 Electric $ 1,472 10.50% to 10.65% Fourth quarter of 2023 DPL - Delaware (b) December 15, 2022 Electric 60 10.50% Second quarter of 2024 __________ (a) Reflects a four-year cumulative MRP for January 1, 2024 to December 31, 2027 and total requested revenue requirement increases of $877 million effective January 1, 2024, $175 million effective January 1, 2025, $217 million effective January 1, 2026, and $203 million effective January 1, 2027, based on forecasted revenue requirements. The revenue requirement will provide for a weighted average debt and equity return on distribution rate base of 7.43% in 2024, 7.50% in 2025, 7.62% in 2026, and 7.70% in 2027, inclusive of an allowed ROE of 10.50% in 2024, 10.55% in 2025, 10.60% in 2026, and 10.65% in 2027. The requested revenue requirements are based on capital structures that reflect between 50.58% and 51.19% common equity. ComEd’s MRP also includes a proposed rate phase-in to defer approximately $307 million of the $877 million year-over-year increase for 2024 revenue from 2024 to 2026. (b) The rates will go into effect on July 15, 2023, subject to refund. Transmission Formula Rates The Utility Registrants' transmission rates are each established based on a FERC-approved formula. ComEd, BGE, Pepco, DPL, and ACE are required to file an annual update to the FERC-approved formula on or before May 15, and PECO is required to file on or before May 31, with the resulting rates effective on June 1 of the same year. The annual update for ComEd is based on prior year actual costs and current year projected capital additions (initial year revenue requirement). The update for ComEd also reconciles any differences between the revenue requirement in effect beginning June 1 of the prior year and actual costs incurred for that year (annual reconciliation). The annual update for PECO is based on prior year actual costs and current year projected capital additions, accumulated depreciation, and accumulated deferred income taxes. The annual update for BGE, Pepco, DPL, and ACE is based on prior year actual costs and current year projected capital additions, accumulated depreciation, depreciation and amortization expense, and accumulated deferred income taxes. The update for PECO, BGE, Pepco, DPL, and ACE also reconciles any differences between the actual costs and actual revenues for the calendar year (annual reconciliation). For 2022, the following total increases/(decreases) were included in the Utility Registrants' electric transmission formula rate updates: Registrant (a) Initial Revenue Requirement Increase Annual Reconciliation (Decrease) Increase Total Revenue Requirement Increase Allowed Return on Rate Base (b) Allowed ROE (c) ComEd $ 24 $ (24) $ — 8.11 % 11.50 % PECO 23 16 39 7.30 % 10.35 % BGE 25 (4) 16 (d) 7.30 % 10.50 % Pepco 16 15 31 7.60 % 10.50 % DPL 9 2 11 7.09 % 10.50 % ACE 21 13 34 7.18 % 10.50 % __________ (a) All rates are effective June 1, 2022 - May 31, 2023, subject to review by interested parties pursuant to review protocols of each Utility Registrants' tariff. (b) Represents the weighted average debt and equity return on transmission rate bases. For ComEd and PECO, the common equity component of the ratio used to calculate the weighted average debt and equity return on the transmission formula rate base is currently capped at 55% and 55.75%, respectively. (c) The rate of return on common equity for each Utility Registrant includes a 50-basis-point incentive adder for being a member of a RTO. (d) The increase in BGE's transmission revenue requirement includes a $5 million reduction related to a FERC-approved dedicated facilities charge to recover the costs of providing transmission service to specifically designated load by BGE. Other State Regulatory Matters Illinois Regulatory Matters CEJA (Exelon and ComEd). On September 15, 2021, the Governor of Illinois signed into law CEJA. CEJA includes, among other features, (1) procurement of CMCs from qualifying nuclear-powered generating facilities, (2) a requirement to file a general rate case or a new four-year MRP no later than January 20, 2023 to establish rates effective after ComEd’s existing performance-based distribution formula rate sunsets, (3) an extension of and certain adjustments to ComEd’s energy efficiency MWh savings goals, (4) revisions to the Illinois RPS requirements, including expanded charges for the procurement of RECs from wind and solar generation, (5) a requirement to accelerate amortization of ComEd’s unprotected excess deferred income taxes (EDIT) that ComEd was previously directed by the ICC to amortize using the average rate assumption method which equates to approximately 39.5 years, and (6) requirements that ComEd and the ICC initiate and conduct various regulatory proceedings on subjects including ethics, spending, grid investments, and performance metrics. Regulatory or legal challenges regarding the validity or implementation of CEJA are possible and Exelon and ComEd cannot reasonably predict the outcome of any such challenges. ComEd Electric Distribution Rates ComEd filed, and received approval for, its last performance-based electric distribution formula rate update filing under EIMA in 2022; those rates are in effect throughout 2023. On February 3, 2022, the ICC approved a tariff that establishes the process under which ComEd will reconcile its 2022 and 2023 rate year revenue requirements with actual costs. Those reconciliation amounts will be determined using the same process as were used for prior reconciliations under the performance-based electric distribution formula rate. Using that process, for the rate years 2022 and 2023 ComEd will ultimately collect revenues from customers reflecting each year’s actual recoverable costs, year-end rate base, and a weighted average debt and equity return on distribution rate base, with the ROE component based on the annual average of the monthly yields of the 30-year U.S. Treasury bonds plus 580 basis points. ComEd will in 2023 file with the ICC the first such petition to reconcile its 2022 actual costs with the approved revenue requirement that was in effect in 2022. The rate year 2023 reconciliation will be filed in 2024. Beginning in 2024, ComEd will recover from retail customers, subject to certain exceptions, the costs it incurs to provide electric delivery services either through its electric distribution rate or other recovery mechanisms authorized by CEJA. On January 17, 2023, ComEd filed a petition with the ICC seeking approval of a MRP for 2024-2027. The MRP supports a multi-year grid plan (Grid Plan), also filed on January 17, covering planned investments on the electric distribution system within ComEd’s service area through 2027. Costs incurred during each year of the multi-year plan are subject to ICC review and the plan’s revenue requirement for each year will be reconciled with the actual costs that the ICC determines are prudently and reasonably incurred for that year. The reconciliation is subject to adjustment for certain costs, including a limitation on recovery of costs that are more than 105% of certain costs in the previously approved MRP revenue requirement, absent a modification of the rate plan itself. Thus, for example, the rate adjustments necessary to reconcile 2024 revenues to ComEd’s actual 2024 costs incurred would take effect in January 2026 after the ICC’s review during 2025. The ICC must issue its decision on both the MRP and Grid Plan by mid-December 2023, for rates to begin with the January 2024 billing cycle. In January 2022, ComEd filed a request with the ICC proposing performance metrics that would be used in determining ROE incentives and penalties in the event ComEd filed a MRP in January 2023. On September 27, 2022, the ICC issued a final order approving seven performance metrics that provide symmetrical performance adjustments of 32 total basis points to ComEd’s rate of return on common equity based on the extent to which ComEd achieves the annual performance goals. On November 10, 2022, the ICC granted ComEd's application for rehearing, in part. Rehearing on those issues must conclude by April 9, 2023. It is unclear if rehearing will result in modifications to the ICC-approved performance and tracking metrics. ComEd will make its initial filing in 2025 to assess performance achieved under the metrics in 2024, and to determine any ROE adjustment, which would take effect in 2026. Carbon Mitigation Credit CEJA establishes decarbonization requirements for Illinois as well as programs to support the retention and development of emissions-free sources of electricity. ComEd is required to purchase CMCs from participating nuclear-powered generating facilities between June 1, 2022 and May 31, 2027. The price to be paid for each CMC was established through a competitive bidding process that included consumer-protection measures that capped the maximum acceptable bid amount and a formula that reduces CMC prices by an energy price index, the base residual auction capacity price in the ComEd zone of PJM, and the monetized value of any federal tax credit or other subsidy if applicable. The consumer protection measures contained in CEJA will result in net payments to ComEd ratepayers if the energy index, the capacity price and applicable federal tax credits or subsidy exceed the CMC contract price. ComEd began issuing credits to its retail customers under its new CMC rider in the June 2022 billing period and recorded a regulatory asset of $843 million as of December 31, 2022 for the difference between customer credits issued and the credit to be received from the participating nuclear-powered generating facilities. Under CEJA, the costs of procuring CMCs will be recovered through a new rider, the Rider Carbon-Free Resource Adjustment (Rider CFRA). The Rider CFRA provides for an annual reconciliation and true-up to actual costs incurred or credits received by ComEd to purchase CMCs, with any difference to be credited to or collected from ComEd’s retail customers in subsequent periods. The difference between the net payments to (or receivables from) ComEd ratepayers and the credits received by ComEd to purchase CMCs is recorded to Purchased Power expense with an offset to the regulatory asset (or regulatory liability). On December 21, 2022, ComEd filed a supplemental statement to the Rider CFRA proposing that the company recover costs or provide credits faster than the tariff allows, implement monthly reconciliations, and allow the Company to adjust Rider CFRA rates based not only on anticipated differences but also past payments or credits. The ICC approved the proposal on January 19, 2023. If the revised CFRA tariff were in effect as of the balance sheet date, the current portion of the CMC regulatory asset balance would have increased by $117 million as of December 31, 2022, with an offsetting reduction in the noncurrent regulatory asset balance. Excess Deferred Income Taxes The ICC initiated a docket to accelerate and fully credit to customers TCJA unprotected property-related EDIT no later than December 31, 2025. On July 7, 2022, the ICC issued a final order on the schedule for the acceleration of EDIT amortization, adopting the proposal as submitted by several parties, including ComEd, ICC Staff, the Illinois Attorney General's Office, and the Citizens Utility Board. EDIT amortization will be credited to customers through a new rider from January 1, 2023 through December 31, 2025. Beneficial Electrification Plan On July 1, 2022, ComEd filed a proposed plan to promote beneficial electrification efforts in its Northern Illinois service area with the ICC as required by CEJA. ComEd's plan is designed to meaningfully reduce barriers to beneficial electrification, including those related to electric vehicles (EVs), such as upfront technology adoption costs, charging costs, and charging availability; promote equity and environmental justice; reduce carbon emissions and surface-level pollutants; and support customer education and awareness of electrification options. As proposed, ComEd could expend approximately $300 million in total over the three-year period 2023 through 2025. The beneficial electrification plan requests recovery of all those costs through a rider mechanism, under which certain of the costs would be amortized over ten years with a return on the unrecovered balance. On November 10, 2022, in responses to a Staff motion, the ICC approved an interim order dismissing from ComEd’s Beneficial Electrification Plan certain rebates (rebates to support residential customers’ purchase of EVs; and rebates to ComEd’s commercial and industrial customers to support the installation of EV chargers). However, the ICC found that building electrification measures were properly within the scope of beneficial electrification, in line with ComEd’s proposal. The ICC also adopted ComEd’s position regarding the rate impact of spending associated with EV related infrastructure. On November 21, 2022, ComEd filed an application for rehearing of the interim order, which the ICC denied. On December 9, 2022, the Office of the Illinois Attorney General (AG) also sought rehearing. On December 15, 2022, ComEd filed an appeal of the ICC’s interim order and the denial of rehearing with the Illinois Appellate Court. That appeal has been stayed pending the resolution of the balance of the case. Also on December 15, 2022, the ICC denied the AG’s application for rehearing and the AG subsequently filed an appeal. The testimony and hearing phase of this proceeding has concluded and the parties are now drafting legal briefs on the contested issues. By law the ICC must issue its decision by the end of March, therefore, a final order is expected to be issued by the ICC no later than the first quarter of 2023. At this time, ComEd cannot predict the outcome of these proceedings. Energy Efficiency CEJA extends ComEd’s current cumulative annual energy efficiency MWh savings goals through 2040, adds expanded electrification measures to those goals, increases low-income commitments and adds a new performance adjustment to the energy efficiency formula rate. ComEd expects its annual spend to increase in 2023 through 2040 to achieve these energy efficiency MWh savings goals, which will be deferred as a separate regulatory asset that will be recovered through the energy efficiency formula rate over the weighted average useful life, as approved by the ICC, of the related energy efficiency measures. Energy Efficiency Formula Rate (Exelon and ComEd). FEJA allows ComEd to defer energy efficiency costs (except for any voltage optimization costs which are recovered through the electric distribution formula rate) as a separate regulatory asset that is recovered through the energy efficiency formula rate over the weighted average useful life, as approved by the ICC, of the related energy efficiency measures. ComEd earns a return on the energy efficiency regulatory asset at a rate equal to its weighted average cost of capital, which is based on a year-end capital structure and calculated using the same methodology applicable to ComEd’s electric distribution formula rate. Beginning January 1, 2018 through December 31, 2030, the ROE that ComEd earns on its energy efficiency regulatory asset is subject to a maximum downward or upward adjustment of 200 basis points if ComEd’s cumulative persisting annual MWh savings falls short of or exceeds specified percentage benchmarks of its annual incremental savings goal. ComEd is required to file an update to its energy efficiency formula rate on or before June 1 st each year, with resulting rates effective in January of the following year. The annual update is based on projected current year energy efficiency costs, PJM capacity revenues, and the projected year-end regulatory asset balance less any related deferred income taxes (initial year revenue requirement). The update also reconciles any differences between the revenue requirement in effect for the prior year and actual costs incurred from the year (annual reconciliation). The approved energy efficiency formula rate also provides for revenue decoupling provisions similar to those in ComEd’s electric distribution formula rate. During 2022, the ICC approved the following total increases in ComEd's requested energy efficiency revenue requirement: Filing Date Requested Revenue Requirement Increase Approved Revenue Requirement Increase (a) Approved ROE Approval Date Rate Effective Date May 25, 2022 $ 50 $ 50 7.85 % October 27, 2022 January 1, 2023 _________ (a) ComEd’s 2023 approved revenue requirement above reflects an increase of $66 million for the initial year revenue requirement for 2023 and a decrease of $16 million related to the annual reconciliation for 2021. The revenue requirement for 2023 provides for a weighted average debt and equity return on the energy efficiency regulatory asset and rate base of 5.94% inclusive of an allowed ROE of 7.85%, reflecting the monthly average yields for 30-year treasury bonds plus 580 basis points. The revenue requirement for the 2021 reconciliation year provides for a weighted average debt and equity return on the energy efficiency regulatory asset and rate base of 5.52% inclusive of an allowed ROE of 6.99%, which includes a downward performance adjustment that decreased the ROE. The performance adjustment can either increase or decrease the ROE based upon the achievement of energy efficiency savings goals. See table below for ComEd's regulatory assets associated with its energy efficiency formula rate. Maryland Regulatory Matters Maryland Revenue Decoupling (Exelon, BGE, PHI, Pepco, and DPL). In 1998, the MDPSC approved natural gas monthly rate adjustments for BGE and in 2007, the MDPSC approved electric monthly rate adjustments for BGE and BSAs for Pepco and DPL, all of which are decoupling mechanisms. As a result of the decoupling mechanisms, certain Operating revenues from electric and natural gas distribution at BGE and Operating revenues from electric distribution at Pepco Maryland (see also District of Columbia Revenue Decoupling below for Pepco District of Columbia) and DPL are not impacted by abnormal weather or usage per customer. For BGE, Pepco, and DPL, the decoupling mechanism eliminates the impacts of abnormal weather or customer usage by recognizing revenues based on an authorized distribution amount per customer by customer class. Operating revenues from electric and natural gas distribution at BGE and Operating revenues from electric distribution at Pepco Maryland and DPL are, however, impacted by changes in the number of customers. Maryland Order Directing the Distribution of Energy Assistance Funds (Exelon, BGE, PHI, Pepco, and DPL). On June 15, 2021, the MDPSC issued an order authorizing the disbursal of funds to utilities in accordance with Maryland COVID-19 relief legislation. Under this order, BGE, Pepco, and DPL received funds of $50 million, $12 million, and $8 million, respectively, in July 2021. The funds have been used to reduce or eliminate certain qualifying past-due residential customer receivables. District of Columbia Regulatory Matters District of Columbia Revenue Decoupling (Exelon, PHI, and Pepco). In 2009, the DCPSC approved a BSA, which is a decoupling mechanism. As a result of the decoupling mechanism, Operating revenues from electric distribution at Pepco District of Columbia (see also Maryland Revenue Decoupling above for Pepco Maryland) are not impacted by abnormal weather or usage per customer. The decoupling mechanism eliminates the impacts of abnormal weather or customer usage by recognizing revenues based on an authorized distribution amount per customer by customer class. Operating revenues from electric distribution at Pepco District of Columbia are, however, impacted by changes in the number of customers. New Jersey Regulatory Matters Conservation Incentive Program (CIP) (Exelon, PHI, and ACE). On September 25, 2020, ACE filed an application with the NJBPU as was required seeking approval to implement a portfolio of energy efficiency programs pursuant to New Jersey’s clean energy legislation. The filing included a request to implement a CIP that would eliminate the favorable and unfavorable impacts of weather and customer usage patterns on distribution revenues for most customers. The CIP compares current distribution revenues by customer class to approved target revenues established in ACE’s most recent distribution base rate case. The CIP is calculated annually and recovery is subject to certain conditions, including an earnings test and ceilings on customer rate increases. On April 27, 2021, the NJBPU approved the settlement filed by ACE and the third parties to the proceeding. The approved settlement addresses all material aspects of ACE’s filing, including ACE’s ability to implement the CIP prospectively effective July 1, 2021. As a result of this decoupling mechanism, operating revenues will no longer be impacted by abnormal weather or usage for most customers. Starting in third quarter of 2021, ACE will record alternative revenue program revenues for its best estimate of the distribution revenue impacts resulting from future changes in CIP rates that it believes are probable of approval by the NJBPU in accordance with this mechanism. Termination of Energy Procurement Provisions of PPAs (Exelon, PHI, and ACE). On December 22, 2021, ACE filed with the NJBPU a petition to terminate the provisions in the PPAs to purchase electricity from two coal-powered generation facilities located in the state of New Jersey. The petition was approved by the NJBPU on March 23, 2022. Upon closing of the transaction on March 31, 2022, ACE recognized a liability of $203 million for the contract termination fee, which is to be paid by the end of 2024, and recognized a corresponding regulatory asset of $203 million. As of December 31, 2022, the $137 million liability for the contract termination fee consists of $87 million and $50 million included in Other current liabilities and Other deferred credits and other liabilities, respectively, in Exelon's Consolidated Balance Sheet. The current and noncurrent liabilities are included in PPA termination obligation and Other deferred credits and other liabilities, respectively, in PHI's and ACE's Consolidated Balance Sheets. For the year ended December 31, 2022, ACE has paid $66 million of the liability, which is recorded in Changes in Other assets and liabilities in Exelon's, PHI's, and ACE's Consolidated Statements of Cash Flows. ACE Infrastructure Investment Program Filings (Exelon, PHI, and ACE). On February 28, 2018, ACE filed with the NJBPU the company’s IIP proposing to seek recovery of a series of investments through a new rider mechanism, totaling $338 million, between 2019-2022 to provide safe and reliable service for its customers. The IIP will allow for more timely recovery of investments made to modernize and enhance ACE’s electric system. On April 15, 2019, ACE entered into a settlement agreement with other parties, which allows for a recovery totaling $96 million of reliability related capital investments from July 1, 2019 through June 30, 2023. On April 18, 2019, the NJBPU approved the settlement agreement. On October 31, 2022, ACE filed with the NJBPU the company’s second IIP, proposing to seek recovery through a new component of ACE’s rider mechanism, totaling $379 million, over the four-year period of July 1, 2023 to June 30, 2027. The new IIP will allow ACE to invest in projects that are designed to enhance the reliability, resiliency, and safety of the service ACE provides to its customers. ACE has requested that the NJBPU render a decision in this matter during the first half of 2023 but cannot predict if the NJBPU will approve the application as filed. Advanced Metering Infrastructure Filing (Exelon, PHI, and ACE). On August 26, 2020, ACE filed an application with the NJBPU as was required seeking approval to deploy a smart energy network in alignment with New Jersey’s Energy Master Plan and Clean Energy Act. The proposal consisted of estimated costs totaling $220 million with deployment taking place over a 3-year implementation period from approximately 2021 to 2024 that involves the installation of an integrated system of smart meters for all customers accompanied by the requisite communications facilities and data management systems. On July 14, 2021, the NJBPU approved the settlement filed by ACE and

Revenue from Contracts with Cus

Revenue from Contracts with Customers (All Registrants)	12 Months Ended
Revenue from Contracts with Customers (All Registrants)	Dec. 31, 2022
Revenue from Contract with Customer (All Registrants) [Abstract]
Revenue from Contracts with Customers [Text Block]	Revenue from Contracts with Customers (All Registrants) The Registrants recognize revenue from contracts with customers to depict the transfer of goods or services to customers at an amount that the entities expect to be entitled to in exchange for those goods or services. The primary sources of revenue include regulated electric and gas tariff sales, distribution, and transmission services. The performance obligations, revenue recognition, and payment terms associated with these sources of revenue are further discussed in the table below. There are no significant financing components for these sources of revenue and no variable consideration. Unless otherwise noted, for each of the significant revenue categories and related performance obligations described below, the Registrants have the right to consideration from the customer in an amount that corresponds directly with the value transferred to the customer for the performance completed to date. Therefore, the Registrants generally recognize revenue in the amount for which they have the right to invoice the customer. As a result, there are generally no significant judgments used in determining or allocating the transaction price. Revenue Source Description Performance Obligation Timing of Revenue Recognition Payment Terms Regulated Electric and Gas Tariff Sales Sales of electricity and electricity distribution services (the Utility Registrants) and natural gas and gas distribution services (PECO, BGE, and DPL) to residential, commercial, industrial, and governmental customers through regulated tariff rates approved by state regulatory commissions. Delivery of electricity and/or natural gas. Over time (each day) as the electricity and/or natural gas is delivered to customers. Tariff sales are generally considered daily contracts as customers can discontinue service at any time. (a) Within the month following delivery of the electricity or natural gas to the customer. Regulated Transmission Services The Utility Registrants provide open access to their transmission facilities to PJM, which directs and controls the operation of these transmission facilities and accordingly compensates the Utility Registrants pursuant to filed tariffs at cost-based rates approved by FERC. Various including (i) Network Integration Transmission Services (NITS), (ii) scheduling, system control and dispatch services, and (iii) access to the wholesale grid. Over time utilizing output methods to measure progress towards completion. (b) Paid weekly by PJM. __________ (a) Electric and natural gas utility customers have the choice to purchase electricity or natural gas from competitive electric generation and natural gas suppliers. While the Utility Registrants are required under state legislation to bill their customers for the supply and distribution of electricity and/or natural gas, they recognize revenue related only to the distribution services when customers purchase their electricity or natural gas from competitive suppliers. (b) Passage of time is used for NITS and access to the wholesale grid and MWhs of energy transported over the wholesale grid is used for scheduling, system control and dispatch services. The Utility Registrants do not incur any material costs to obtain or fulfill contracts with customers. Contract Liabilities The Registrants record contract liabilities when consideration is received or due prior to the satisfaction of the performance obligations. The Registrants record contract liabilities in Other current liabilities and Other noncurrent liabilities in the Registrants' Consolidated Balance Sheets. On July 1, 2020, Pepco, DPL, and ACE each entered into a collaborative arrangement with an unrelated owner and manager of communication infrastructure (the Buyer). Under this arrangement, Pepco, DPL, and ACE sold a 60% undivided interest in their respective portfolios of transmission tower attachment agreements with telecommunications companies to the Buyer, in addition to transitioning management of the day-to-day operations of the jointly-owned agreements to the Buyer for 35 years, while retaining the safe and reliable operation of its utility assets. In return, Pepco, DPL, and ACE will provide the Buyer limited access on the portion of the towers where the equipment resides for the purposes of managing the agreements for the benefit of Pepco, DPL, ACE, and the Buyer. In addition, for an initial period of three years and two, two-year extensions that are subject to certain conditions, the Buyer has the exclusive right to enter into new agreements with telecommunications companies and to receive a 30% undivided interest in those new agreements. PHI, Pepco, DPL, and ACE received cash and recorded contract liabilities as of July 1, 2020. The revenue attributable to this arrangement will be recognized as operating revenue over the 35 years under the collaborative arrangement. The following table provides a rollforward of the contract liabilities reflected in Exelon's, PHI's, Pepco's, DPL's, and ACE'S Consolidated Balance Sheets. As of December 31, 2022, 2021, and 2020, ComEd's, PECO's, and BGE's contract liabilities were not material. Exelon (a) PHI (a) Pepco (a) DPL (a) ACE (a) Balance as of December 31, 2020 $ 118 $ 118 $ 94 $ 12 $ 12 Revenues recognized (9) (9) (7) (1) (1) Balance as of December 31, 2021 109 109 87 11 11 Revenues recognized (8) (8) (6) (1) (1) Balance as of December 31, 2022 $ 101 $ 101 $ 81 $ 10 $ 10 __________ (a) Revenues recognized in the years ended December 31, 2022 and 2021, were included in the contract liabilities at December 31, 2021 and 2020, respectively. Transaction Price Allocated to Remaining Performance Obligations The following table shows the amounts of future revenues expected to be recorded in each year for performance obligations that are unsatisfied or partially unsatisfied as of December 31, 2022. This disclosure only includes contracts for which the total consideration is fixed and determinable at contract inception. The average contract term varies by customer type and commodity but ranges from one month to several years. This disclosure excludes the Utility Registrants' gas and electric tariff sales contracts and transmission revenue contracts as they generally have an original expected duration of one year or less and, therefore, do not contain any future, unsatisfied performance obligations to be included in this disclosure. 2023 2024 2025 2026 2027 and thereafter Total Exelon $ 8 $ 6 $ 5 $ 5 $ 77 $ 101 PHI 8 6 5 5 77 101 Pepco 6 5 5 5 60 81 DPL 1 — — — 9 10 ACE 1 1 — — 8 10 Revenue Disaggregation The Registrants disaggregate revenue recognized from contracts with customers into categories that depict how the nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factors. See Note 5 — Segment Information for the presentation of the Registrant's revenue disaggregation.

Segment Information (All Regist

Segment Information (All Registrants)	12 Months Ended
Segment Information (All Registrants)	Dec. 31, 2022
Segment Reporting [Abstract]
Segment Information (All Registrants)	Segment Information (All Registrants) Operating segments for each of the Registrants are determined based on information used by the CODMs in deciding how to evaluate performance and allocate resources at each of the Registrants. Exelon has six reportable segments, which include ComEd, PECO, BGE, and PHI's three reportable segments consisting of Pepco, DPL, and ACE. ComEd, PECO, BGE, Pepco, DPL, and ACE each represent a single reportable segment, and as such, no separate segment information is provided for these Registrants. Exelon, ComEd, PECO, BGE, Pepco, DPL, and ACE's CODMs evaluate the performance of and allocate resources to ComEd, PECO, BGE, Pepco, DPL, and ACE based on net income. The separation of Constellation Energy Corporation, including Generation and its subsidiaries, meets the criteria for discontinued operations and as such, results of operations are presented as discontinued operations and have been excluded from continuing operations for all periods presented. Furthermore, the reportable segment information related to the discontinued operations has been excluded from the tables presented below. See Note 2 — Discontinued Operations for additional information. An analysis and reconciliation of the Registrants' reportable segment information to the respective information in the consolidated financial statements for the years ended December 31, 2022, 2021, and 2020 is as follows: ComEd PECO BGE PHI Other (a) Intersegment Exelon Operating revenues (b) : 2022 Electric revenues $ 5,761 $ 3,165 $ 2,871 $ 5,317 $ — $ (31) $ 17,083 Natural gas revenues — 738 1,024 238 — (5) 1,995 Shared service and other revenues — — — 10 1,823 (1,833) — Total operating revenues $ 5,761 $ 3,903 $ 3,895 $ 5,565 $ 1,823 $ (1,869) $ 19,078 2021 Electric revenues $ 6,406 $ 2,659 $ 2,505 $ 4,860 $ — $ (35) $ 16,395 Natural gas revenues — 539 836 168 — — 1,543 Shared service and other revenues — — — 13 2,213 (2,226) — Total operating revenues $ 6,406 $ 3,198 $ 3,341 $ 5,041 $ 2,213 $ (2,261) $ 17,938 2020 Electric revenues $ 5,904 $ 2,543 $ 2,336 $ 4,485 $ — $ (44) $ 15,224 Natural gas revenues — 515 762 162 — — 1,439 Shared service and other revenues — — — 16 2,035 (2,051) — Total operating revenues $ 5,904 $ 3,058 $ 3,098 $ 4,663 $ 2,035 $ (2,095) $ 16,663 Intersegment revenues (c) : 2022 $ 16 $ 7 $ 15 $ 10 $ 1,823 $ (1,865) $ 6 2021 41 21 31 13 2,203 (2,252) 57 2020 37 9 20 17 2,024 (2,084) 23 Depreciation and amortization: 2022 $ 1,323 $ 373 $ 630 $ 938 $ 61 $ — $ 3,325 2021 1,205 348 591 821 67 1 3,033 2020 1,133 347 550 782 79 — 2,891 Operating expenses: 2022 $ 4,218 $ 3,102 $ 3,376 $ 4,734 $ 2,093 $ (1,762) $ 15,761 2021 5,151 2,547 2,860 4,240 2,045 (1,587) 15,256 2020 4,950 2,512 2,598 4,045 1,882 (1,502) 14,485 Interest expense, net: 2022 $ 414 $ 177 $ 152 $ 292 $ 415 $ (3) $ 1,447 2021 389 161 138 267 335 (1) 1,289 2020 382 147 133 268 380 (3) 1,307 Income taxes: 2022 $ 264 $ 79 $ 8 $ 9 $ — $ (11) $ 349 2021 172 12 (35) 42 8 (161) 38 2020 177 (30) 41 (77) 35 (153) (7) Net income (loss) from continuing operations: 2022 $ 917 $ 576 $ 380 $ 608 $ (393) $ (34) $ 2,054 2021 742 504 408 561 (156) (443) 1,616 2020 438 447 349 495 (184) (446) 1,099 Capital expenditures: 2022 $ 2,506 $ 1,349 $ 1,262 $ 1,709 $ 95 $ — $ 6,921 2021 2,387 1,240 1,226 1,720 67 — 6,640 2020 2,217 1,147 1,247 1,604 74 — 6,289 Total assets: 2022 $ 39,661 $ 14,502 $ 13,350 $ 26,082 $ 6,014 $ (4,260) $ 95,349 2021 36,470 13,824 12,324 24,744 7,626 (8,319) 86,669 __________ (a) Other primarily includes Exelon’s corporate operations, shared service entities, and other financing and investment activities. (b) Includes gross utility tax receipts from customers. The offsetting remittance of utility taxes to the governing bodies is recorded in expenses in the Registrants’ Consolidated Statements of Operations and Comprehensive Income. See Note 22 — Supplemental Financial Information for additional information on total utility taxes. (c) See Note 23 — Related Party Transactions for additional information on intersegment revenues. PHI: Pepco DPL ACE Other (a) Intersegment PHI Operating revenues (b) : 2022 Electric revenues $ 2,531 $ 1,357 $ 1,431 $ — $ (2) $ 5,317 Natural gas revenues — 238 — — — 238 Shared service and other revenues — — — 391 (381) 10 Total operating revenues $ 2,531 $ 1,595 $ 1,431 $ 391 $ (383) $ 5,565 2021 Electric revenues $ 2,274 $ 1,212 $ 1,388 $ — $ (14) $ 4,860 Natural gas revenues — 168 — — — 168 Shared service and other revenues — — — 379 (366) 13 Total operating revenues $ 2,274 $ 1,380 $ 1,388 $ 379 $ (380) $ 5,041 2020 Electric revenues $ 2,149 $ 1,109 $ 1,245 $ — $ (18) $ 4,485 Natural gas revenues — 162 — — — 162 Shared service and other revenues — — — 372 (356) 16 Total operating revenues $ 2,149 $ 1,271 $ 1,245 $ 372 $ (374) $ 4,663 Intersegment revenues (c) : 2022 $ 5 $ 6 $ 2 $ 380 $ (383) $ 10 2021 5 7 2 380 (381) 13 2020 7 9 4 372 (375) 17 Depreciation and amortization: 2022 $ 417 $ 232 $ 261 $ 28 $ — $ 938 2021 403 210 179 29 — 821 2020 377 191 180 34 — 782 Operating expenses: 2022 $ 2,140 $ 1,359 $ 1,225 $ 393 $ (383) $ 4,734 2021 1,871 1,161 1,201 388 (381) 4,240 2020 1,799 1,120 1,123 378 (375) 4,045 Interest expense, net: 2022 $ 150 $ 66 $ 66 $ 9 $ 1 $ 292 2021 140 61 58 8 — 267 2020 138 61 59 10 — 268 Income taxes: 2022 $ (9) $ 14 $ 3 $ 1 $ — $ 9 2021 15 42 (13) (2) — 42 2020 (7) (25) (41) (4) — (77) Net income (loss): 2022 $ 305 $ 169 $ 148 $ (14) $ — $ 608 2021 296 128 146 (9) — 561 2020 266 125 112 (8) — 495 Capital expenditures: 2022 $ 874 $ 430 $ 398 $ 7 $ — $ 1,709 2021 843 429 445 3 — 1,720 2020 773 424 401 6 — 1,604 Total assets: 2022 $ 10,657 $ 5,802 $ 4,979 $ 4,677 $ (33) $ 26,082 2021 9,903 5,412 4,556 4,933 (60) 24,744 __________ (a) Other primarily includes PHI’s corporate operations, shared service entities, and other financing and investment activities. (b) Includes gross utility tax receipts from customers. The offsetting remittance of utility taxes to the governing bodies is recorded in expenses in the Registrants’ Consolidated Statements of Operations and Comprehensive Income. See Note 22 — Supplemental Financial Information for additional information on total utility taxes. (c) Includes intersegment revenues with ComEd, BGE, and PECO, which are eliminated at Exelon. The following tables disaggregate the Registrants' revenues recognized from contracts with customers into categories that depict how the nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factors. For the Utility Registrants, the disaggregation of revenues reflects the two primary utility services of electric sales and natural gas sales (where applicable), with further disaggregation of these tariff sales provided by major customer groups. Exelon's disaggregated revenues are consistent with the Utility Registrants, but exclude any intercompany revenues. 2022 Revenues from contracts with customers ComEd PECO BGE PHI Pepco DPL ACE Electric revenues Residential $ 3,304 $ 2,026 $ 1,564 $ 2,590 $ 1,076 $ 750 $ 764 Small commercial & industrial 1,173 521 327 607 155 235 217 Large commercial & industrial 5 299 567 1,422 1,083 137 202 Public authorities & electric railroads 29 30 27 64 34 15 15 Other (a) 955 271 398 695 208 227 252 Total electric revenues (b) $ 5,466 $ 3,147 $ 2,883 $ 5,378 $ 2,556 $ 1,364 $ 1,450 Natural gas revenues Residential $ — $ 512 $ 678 $ 127 $ — $ 127 $ — Small commercial & industrial — 186 111 55 — 55 — Large commercial & industrial — — 183 12 — 12 — Transportation — 26 — 15 — 15 — Other (c) — 12 68 29 — 29 — Total natural gas revenues (d) $ — $ 736 $ 1,040 $ 238 $ — $ 238 $ — Total revenues from contracts with customers $ 5,466 $ 3,883 $ 3,923 $ 5,616 $ 2,556 $ 1,602 $ 1,450 Other revenues Revenues from alternative revenue programs $ 267 $ 2 $ (47) $ (59) $ (31) $ (9) $ (19) Other electric revenues (e) 28 16 14 8 6 2 — Other natural gas revenues (e) — 2 5 — — — — Total other revenues $ 295 $ 20 $ (28) $ (51) $ (25) $ (7) $ (19) Total revenues for reportable segments $ 5,761 $ 3,903 $ 3,895 $ 5,565 $ 2,531 $ 1,595 $ 1,431 2021 Revenues from contracts with customers ComEd PECO BGE PHI Pepco DPL ACE Electric revenues Residential $ 3,233 $ 1,704 $ 1,375 $ 2,441 $ 1,003 $ 694 $ 744 Small commercial & industrial 1,571 422 267 521 135 193 193 Large commercial & industrial 559 243 459 1,123 844 94 185 Public authorities & electric railroads 45 31 27 58 31 14 13 Other (a) 926 229 371 634 205 201 229 Total electric revenues (b) $ 6,334 $ 2,629 $ 2,499 $ 4,777 $ 2,218 $ 1,196 $ 1,364 Natural gas revenues Residential $ — $ 372 $ 518 $ 97 $ — $ 97 $ — Small commercial & industrial — 136 83 42 — 42 — Large commercial & industrial — — 147 7 — 7 — Transportation — 24 — 14 — 14 — Other (c) — 7 68 8 — 8 — Total natural gas revenues (d) $ — $ 539 $ 816 $ 168 $ — $ 168 $ — Total revenues from contracts with customers $ 6,334 $ 3,168 $ 3,315 $ 4,945 $ 2,218 $ 1,364 $ 1,364 Other revenues Revenues from alternative revenue programs $ 42 $ 26 $ 12 $ 91 $ 53 $ 14 $ 24 Other electric revenues (e) 30 4 11 5 3 2 — Other natural gas revenues (e) — — 3 — — — — Total other revenues $ 72 $ 30 $ 26 $ 96 $ 56 $ 16 $ 24 Total revenues for reportable segments $ 6,406 $ 3,198 $ 3,341 $ 5,041 $ 2,274 $ 1,380 $ 1,388 2020 Revenues from contracts with customers ComEd PECO BGE PHI Pepco DPL ACE Electric revenues Residential $ 3,090 $ 1,656 $ 1,345 $ 2,332 $ 988 $ 652 $ 692 Small commercial & industrial 1,399 386 241 472 132 171 169 Large commercial & industrial 515 228 406 1,001 736 89 176 Public authorities & electric railroads 45 29 27 60 34 13 13 Other (a) 884 225 309 613 218 190 207 Total electric revenues (b) $ 5,933 $ 2,524 $ 2,328 $ 4,478 $ 2,108 $ 1,115 $ 1,257 Natural gas revenues Residential $ — $ 361 $ 504 $ 96 $ — $ 96 $ — Small commercial & industrial — 126 79 42 — 42 — Large commercial & industrial — — 135 4 — 4 — Transportation — 24 — 14 — 14 — Other (c) — 4 29 6 — 6 — Total natural gas revenues (d) $ — $ 515 $ 747 $ 162 $ — $ 162 $ — Total revenues from contracts with customers $ 5,933 $ 3,039 $ 3,075 $ 4,640 $ 2,108 $ 1,277 $ 1,257 Other revenues Revenues from alternative revenue programs $ (47) $ 16 $ 16 $ 21 $ 40 $ (7) $ (12) Other electric revenues (e) 18 3 5 2 1 1 — Other natural gas revenues (e) — — 2 — — — — Total other revenues $ (29) $ 19 $ 23 $ 23 $ 41 $ (6) $ (12) Total revenues for reportable segments $ 5,904 $ 3,058 $ 3,098 $ 4,663 $ 2,149 $ 1,271 $ 1,245 __________ (a) Includes revenues from transmission revenue from PJM, wholesale electric revenue and mutual assistance revenue. (b) Includes operating revenues from affiliates in 2022, 2021, and 2020 respectively of: • $16 million, $41 million, and $37 million at ComEd • $7 million, $20 million, and $8 million at PECO • $7 million, $13 million, and $10 million at BGE • $10 million, $13 million, and $17 million at PHI • $5 million, $5 million, and $7 million at Pepco • $6 million, $7 million, and $9 million at DPL • $2 million, $2 million, and $4 million at ACE (c) Includes revenues from off-system natural gas sales. (d) Includes operating revenues from affiliates in 2022, 2021, and 2020 respectively of: • less than $1 million, $1 million, and $1 million at PECO • $8 million, $18 million, and $10 million at BGE (e) Includes late payment charge revenues.

Accounts Receivable (All Regist

Accounts Receivable (All Registrants)	12 Months Ended
Accounts Receivable (All Registrants)	Dec. 31, 2022
Credit Loss [Abstract]
Accounts Receivable (All Registrants)	Accounts Receivable (All Registrants) Allowance for Credit Losses on Accounts Receivable The following tables present the rollforward of Allowance for Credit Losses on Customer Accounts Receivable. Year Ended December 31, 2022 Exelon ComEd PECO BGE PHI Pepco DPL ACE Balance as of December 31, 2021 $ 320 $ 73 $ 105 $ 38 $ 104 $ 37 $ 18 $ 49 Plus: Current period provision for expected credit losses (a)(b) 176 29 52 37 58 31 12 15 Less: Write-offs, net (c)(d)(e) of recoveries (f) 169 43 52 21 53 21 9 23 Balance as of December 31, 2022 $ 327 $ 59 $ 105 $ 54 $ 109 $ 47 $ 21 $ 41 Year Ended December 31, 2021 Exelon ComEd PECO BGE PHI Pepco DPL ACE Balance as of December 31, 2020 $ 334 $ 97 $ 116 $ 35 $ 86 $ 32 $ 22 $ 32 Plus: Current period provision for expected credit losses 96 21 23 15 37 13 6 18 Less: Write-offs, net of recoveries 110 45 34 12 19 8 10 1 Balance as of December 31, 2021 $ 320 $ 73 $ 105 $ 38 $ 104 $ 37 $ 18 $ 49 _________ (a) For PECO, BGE, Pepco and DPL, the change in current period provision for expected credit losses is primarily a result of increased receivable balances. (b) For ACE, the change in current period provision for expected credit losses is primarily a result of decreased receivable balances. (c) For PECO, the change in write-offs is primarily a result of increased disconnection activities. (d) For PHI, Pepco and ACE, the change in write-offs is primarily related to the termination of the moratoriums in the District of Columbia and New Jersey, which beginning in March 2020, prevented customer disconnections for non-payment. With disconnection activities restarting in January 2022, write-offs of aging accounts receivable increased during the year. (e) For DPL, the change in write-offs is primarily a result of favorable customer payment behavior. (f) Recoveries were not material to the Registrants. The following tables present the rollforward of Allowance for Credit Losses on Other Accounts Receivable. Year Ended December 31, 2022 Exelon ComEd PECO BGE PHI Pepco DPL ACE Balance as of December 31, 2021 $ 72 $ 17 $ 7 $ 9 $ 39 $ 16 $ 8 $ 15 Plus: Current period provision (benefit) for expected credit losses 26 3 6 6 11 9 (1) 3 Less: Write-offs, net of recoveries (a) 16 3 4 5 4 — — 4 Balance as of December 31, 2022 $ 82 $ 17 $ 9 $ 10 $ 46 $ 25 $ 7 $ 14 Year Ended December 31, 2021 Exelon ComEd PECO BGE PHI Pepco DPL ACE Balance as of December 31, 2020 $ 71 $ 21 $ 8 $ 9 $ 33 $ 13 $ 9 $ 11 Plus: Current period provision (benefit) for expected credit losses 11 (2) 3 4 6 3 (1) 4 Less: Write-offs, net of recoveries 10 2 4 4 — — — — Balance as of December 31, 2021 $ 72 $ 17 $ 7 $ 9 $ 39 $ 16 $ 8 $ 15 _________ (a) Recoveries were not material to the Registrants. Unbilled Customer Revenue The following table provides additional information about unbilled customer revenues recorded in the Registrants' Consolidated Balance Sheets as of December 31, 2022 and 2021. Unbilled customer revenues (a) Exelon ComEd PECO BGE PHI Pepco DPL ACE December 31, 2022 $ 912 $ 223 $ 219 $ 247 $ 223 $ 103 $ 74 $ 46 December 31, 2021 747 240 161 171 175 82 53 40 _________ (a) Unbilled customer revenues are classified in Customer accounts receivables, net in the Registrants' Consolidated Balance Sheets. Other Purchases of Customer and Other Accounts Receivables The Utility Registrants are required, under separate legislation and regulations in Illinois, Pennsylvania, Maryland, District of Columbia, and New Jersey, to purchase certain receivables from alternative retail electric and, as applicable, natural gas suppliers that participate in the utilities' consolidated billing. The following tables present the total receivables purchased. Total receivables purchased Exelon (a) ComEd (a) PECO (a) BGE (a) PHI Pepco DPL ACE Year ended December 31, 2022 $ 3,981 $ 965 $ 1,081 $ 792 $ 1,143 $ 723 $ 205 $ 215 Year ended December 31, 2021 $ 3,840 $ 1,031 $ 1,041 $ 687 $ 1,081 $ 660 $ 217 $ 204 _________ (a) For BGE, includes $4 million of receivables purchased from Generation prior to the separation on February 1, 2022 for the year ended December 31, 2022. For ComEd, PECO, and BGE, includes $1 million, $1 million, and $21 million of receivables purchased from Generation, respectively, for the year ended December 31, 2021.

Property, Plant and Equipment (

Property, Plant and Equipment (All Registrants)	12 Months Ended
Property, Plant and Equipment (All Registrants)	Dec. 31, 2022
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment (All Registrants)	Property, Plant, and Equipment (All Registrants) The following tables present a summary of property, plant, and equipment by asset category as of December 31, 2022 and 2021: Asset Category Exelon ComEd PECO BGE PHI Pepco DPL ACE December 31, 2022 Electric—transmission and distribution $ 69,034 $ 32,906 $ 10,719 $ 9,993 $ 17,165 $ 11,270 $ 5,231 $ 5,219 Gas—transportation and distribution 8,126 — 3,619 4,074 696 — 855 — Common—electric and gas 2,521 — 1,071 1,317 228 — 206 — Construction work in progress 4,534 1,174 744 487 2,101 1,526 271 296 Other property, plant, and equipment (a) 791 106 50 50 114 65 29 26 Total property, plant, and equipment 85,006 34,186 16,203 15,921 20,304 12,861 6,592 5,541 Less: accumulated depreciation 15,930 6,673 4,078 4,583 2,618 4,067 1,772 1,551 Property, plant, and equipment, net $ 69,076 $ 27,513 $ 12,125 $ 11,338 $ 17,686 $ 8,794 $ 4,820 $ 3,990 December 31, 2021 Electric—transmission and distribution $ 64,771 $ 31,077 $ 10,076 $ 9,352 $ 16,062 $ 10,798 $ 4,957 $ 4,882 Gas—transportation and distribution 7,429 — 3,339 3,712 646 — 806 — Common—electric and gas 2,335 — 1,005 1,224 201 — 180 — Construction work in progress 3,698 918 620 554 1,590 1,118 229 242 Other property, plant and equipment (a) 755 99 41 34 107 63 23 25 Total property, plant and equipment 78,988 32,094 15,081 14,876 18,606 11,979 6,195 5,149 Less: accumulated depreciation 14,430 6,099 3,964 4,299 2,108 3,875 1,635 1,420 Property, plant, and equipment, net $ 64,558 $ 25,995 $ 11,117 $ 10,577 $ 16,498 $ 8,104 $ 4,560 $ 3,729 __________ (a) Primarily composed of land and non-utility property. The following table presents the average service life for each asset category in number of years: Average Service Life (years) Asset Category Exelon ComEd PECO BGE PHI Pepco DPL ACE Electric - transmission and distribution 5-80 5-80 5-70 5-80 5-75 5-75 5-75 5-75 Gas - transportation and distribution 5-80 N/A 5-70 5-80 5-75 N/A 5-75 N/A Common - electric and gas 4-75 N/A 5-55 4-50 5-75 N/A 5-75 N/A Other property, plant, and equipment 4-61 31-50 50 20-50 10-43 10-33 10-43 13-15 The following table presents the annual depreciation rates for each asset category. Annual Depreciation Rates Exelon ComEd PECO BGE PHI Pepco DPL ACE December 31, 2022 Electric—transmission and distribution 2.87% 3.00% 2.29% 2.82% 2.96% 2.58% 3.08% 3.38% Gas—transportation and distribution 2.14% N/A 1.87% 2.53% 1.45% N/A 1.45% N/A Common—electric and gas 7.54% N/A 6.31% 8.20% 8.96% N/A 10.03% N/A December 31, 2021 Electric—transmission and distribution 2.81% 2.94% 2.28% 2.80% 2.87% 2.56% 2.86% 3.21% Gas—transportation and distribution 2.13% N/A 1.84% 2.54% 1.47% N/A 1.47% N/A Common—electric and gas 7.31% N/A 6.34% 7.88% 8.33% N/A 8.69% N/A December 31, 2020 Electric—transmission and distribution 2.79% 2.95% 2.31% 2.69% 2.81% 2.53% 2.85% 3.08% Gas—transportation and distribution 2.14% N/A 1.85% 2.56% 1.50% N/A 1.50% N/A Common—electric and gas 7.01% N/A 6.39% 7.45% 7.36% N/A 6.72% N/A AFUDC The following table summarizes credits to AFUDC by year: Exelon ComEd PECO BGE PHI Pepco DPL ACE December 31, 2022 AFUDC debt and equity $ 215 $ 54 $ 42 $ 29 $ 90 $ 69 $ 10 $ 11 December 31, 2021 AFUDC debt and equity $ 189 $ 47 $ 34 $ 36 $ 72 $ 59 $ 8 $ 5 December 31, 2020 AFUDC debt and equity $ 150 $ 42 $ 23 $ 30 $ 55 $ 42 $ 6 $ 7 See Note 1 — Significant Accounting Policies for additional information regarding property, plant and equipment policies. See Note 16 — Debt and Credit Agreements for additional information regarding Exelon’s, ComEd’s, PECO's, Pepco's, DPL's, and ACE’s property, plant and equipment subject to mortgage liens.

Jointly Owned Electric Utility

Jointly Owned Electric Utility Plant (Exelon, PECO, DPL and ACE)	12 Months Ended
	Dec. 31, 2022
Public Utilities, Property, Plant and Equipment [Abstract]
Jointly Owned Electric Utility Plant (Exelon, PECO, DPL and ACE)	Jointly Owned Electric Utility Plant (Exelon, PECO, PHI, DPL, and ACE) PECO's, DPL's, and ACE's material undivided ownership interests in jointly owned electric plants and transmission facilities as of December 31, 2022 and 2021 were as follows: Transmission NJ/DE (a) Operator PSEG/DPL Ownership interest various Exelon’s share as of December 31, 2022: Plant in service $ 103 Accumulated depreciation 56 Exelon’s share as of December 31, 2021: Plant in service $ 103 Accumulated depreciation 55 __________ (a) PECO, DPL, and ACE own a 42.55%, 1%, and 13.9% share, respectively, in 151.3 miles of 500kV lines located in New Jersey and in the Salem generating plant substation. PECO, DPL, and ACE also own a 42.55%, 7.45%, and 7.45% share, respectively, in 2.5 miles of 500kV line located over the Delaware River. ACE also has a 21.78% share in a 500kV New Freedom Switching substation. PECO's, DPL's, and ACE's undivided ownership interests are financed with their funds and all operations are accounted for as if such participating interests were wholly owned facilities. PECO's, DPL's, and ACE's share of direct expenses of the jointly owned plants are included in Operating and maintenance expenses in Exelon's, PECO's, PHI's, DPL's, and ACE's Consolidated Statements of Operations and Comprehensive Income.

Asset Retirement Obligations (A

Asset Retirement Obligations (All Registrants)	12 Months Ended
Asset Retirement Obligations (All Registrants)	Dec. 31, 2022
Asset Retirement Obligation Disclosure [Abstract]
Asset Retirement Obligations (All Registrants)	Asset Retirement Obligations (All Registrants) The Registrants have AROs primarily associated with the abatement and disposal of equipment and buildings contaminated with asbestos and PCBs. See Note 1 — Significant Accounting Policies for additional information on the Registrants’ accounting policy for AROs. The following table provides a rollforward of the AROs reflected in the Registrants’ Consolidated Balance Sheets from December 31, 2020 to December 31, 2022: Exelon ComEd PECO BGE PHI Pepco DPL ACE AROs as of December 31, 2020 $ 249 $ 129 $ 29 $ 23 $ 59 $ 39 $ 14 $ 6 Net increase due to changes in, and timing of, estimated future cash flows 26 15 — 2 10 5 2 3 Accretion expense (a) 7 4 1 1 1 1 — — Payments (8) (2) (1) — — — — — AROs as of December 31, 2021 274 146 29 26 70 45 16 9 Net (decrease) increase due to changes in, and timing of, estimated future cash flows (8) 2 (1) 3 (13) (8) (3) (2) Accretion expense (a) 8 4 1 1 2 2 — — Payments (3) (2) (1) — — — — — AROs as of December 31, 2022 $ 271 $ 150 $ 28 $ 30 $ 59 $ 39 $ 13 $ 7 __________ (a) For ComEd, PECO, BGE, PHI, DPL and ACE, the majority of the accretion is recorded as an increase to a regulatory asset due to the associated regulatory treatment.

Leases (All Registrants)

Leases (All Registrants)	12 Months Ended
Leases (All Registrants)	Dec. 31, 2022
Leases [Abstract]
Leases of Lessee Disclosure [Text Block]	Lessee The Registrants have operating and finance leases for which they are the lessees. The following tables outline the significant types of leases at each registrant and other terms and conditions of the lease agreements as of December 31, 2022. Exelon, ComEd, PECO, and BGE did not have material finance leases in 2022, 2021, or in 2020. Exelon ComEd PECO BGE PHI Pepco DPL ACE Real estate ● ● ● ● ● ● ● ● Vehicles and equipment ● ● ● ● ● ● ● ● (in years) Exelon ComEd PECO BGE PHI Pepco DPL ACE Remaining lease terms 1-83 1-3 1-11 1-83 1-9 1-9 1-9 1-7 Options to extend the term 3-30 N/A N/A N/A 3-30 5 3-30 5 Options to terminate within 1-10 1 N/A N/A N/A N/A N/A N/A The components of operating lease costs were as follows: Exelon ComEd PECO BGE PHI Pepco DPL ACE For the year ended December 31, 2022 Operating lease costs $ 66 $ 2 $ — $ 15 $ 42 $ 10 $ 12 $ 6 Variable lease costs 8 1 — — 2 1 1 1 Total lease costs (a) $ 74 $ 3 $ — $ 15 $ 44 $ 11 $ 13 $ 7 For the year ended December 31, 2021 Operating lease costs $ 84 $ 3 $ — $ 30 $ 43 $ 10 $ 12 $ 6 Variable lease costs 7 1 — 1 1 — — — Total lease costs (a) $ 91 $ 4 $ — $ 31 $ 44 $ 10 $ 12 $ 6 For the year ended December 31, 2020 Operating lease costs $ 98 $ 3 $ 1 $ 33 $ 46 $ 11 $ 13 $ 6 Variable lease costs 7 1 — 1 2 1 1 — Total lease costs (a) $ 105 $ 4 $ 1 $ 34 $ 48 $ 12 $ 14 $ 6 __________ (a) Excludes sublease income recorded at Exelon, PHI, and DPL of $4 million, $4 million, and $4 million for the years ended December 31, 2022, 2021, and 2020, respectively. The components of financing lease costs were as follows: PHI Pepco DPL ACE For the year ended December 31, 2022 Amortization of ROU asset $ 14 $ 5 $ 6 $ 3 Interest on lease liabilities 4 1 2 1 Total finance lease cost $ 18 $ 6 $ 8 $ 4 For the year ended December 31, 2021 Amortization of ROU asset $ 11 $ 4 $ 4 $ 3 Interest on lease liabilities 2 1 1 — Total finance lease cost $ 13 $ 5 $ 5 $ 3 For the year ended December 31, 2020 Amortization of ROU asset $ 7 $ 3 $ 3 $ 2 Interest on lease liabilities 2 — 1 — Total finance lease cost $ 9 $ 3 $ 4 $ 2 The following tables provide additional information regarding the presentation of operating and finance lease ROU assets and lease liabilities within the Registrants’ Consolidated Balance Sheets: Operating Leases Exelon ComEd PECO BGE PHI Pepco DPL ACE As of December 31, 2022 Operating lease ROU assets Other deferred debits and other assets $ 265 $ 2 $ 1 $ 2 $ 180 $ 36 $ 39 $ 9 Operating lease liabilities Other current liabilities 40 2 — — 31 6 8 3 Other deferred credits and other liabilities 266 — 1 4 167 34 42 7 Total operating lease liabilities $ 306 $ 2 $ 1 $ 4 $ 198 $ 40 $ 50 $ 10 As of December 31, 2021 Operating lease ROU assets Other deferred debits and other assets $ 271 $ 5 $ 1 $ 16 $ 209 $ 43 $ 46 $ 11 Operating lease liabilities Other current liabilities 52 2 — 15 31 6 8 3 Other deferred credits and other liabilities 263 3 1 4 195 40 49 9 Total operating lease liabilities $ 315 $ 5 $ 1 $ 19 $ 226 $ 46 $ 57 $ 12 Finance Leases PHI Pepco DPL ACE As of December 31, 2022 Finance lease ROU assets Plant, property and equipment, net $ 74 $ 25 $ 31 $ 18 Finance lease liabilities Long-term debt due within one year 12 4 5 3 Long-term debt 64 21 27 16 Total finance lease liabilities $ 76 $ 25 $ 32 $ 19 As of December 31, 2021 Finance lease ROU assets Plant, property and equipment, net $ 73 $ 25 $ 29 $ 19 Finance lease liabilities Long-term debt due within one year 10 3 4 3 Long-term debt 64 23 25 16 Total finance lease liabilities $ 74 $ 26 $ 29 $ 19 The weighted average remaining lease terms, in years, for operating and finance leases were as follows: Operating Leases Exelon ComEd PECO BGE PHI Pepco DPL ACE As of December 31, 2022 9.5 1.0 5.5 70.9 6.8 8.1 7.9 3.3 As of December 31, 2021 8.9 3.3 6.1 13.7 7.5 8.6 8.5 3.5 As of December 31, 2020 9.0 3.8 4.2 8.3 8.2 9.1 9.1 4.0 Finance Leases PHI Pepco DPL ACE As of December 31, 2022 5.5 5.4 5.5 5.6 As of December 31, 2021 6.1 5.9 6.1 6.3 As of December 31, 2020 6.5 6.3 6.5 6.5 The weighted average discount rates for operating and finance leases were as follows: Operating Leases Exelon ComEd PECO BGE PHI Pepco DPL ACE As of December 31, 2022 3.9 % 2.6 % 2.3 % 4.5 % 4.2 % 4.0 % 4.0 % 3.3 % As of December 31, 2021 4.0 % 2.8 % 2.2 % 4.0 % 4.2 % 4.0 % 4.0 % 3.4 % As of December 31, 2020 4.0 % 3.0 % 2.9 % 3.8 % 4.2 % 4.0 % 4.0 % 3.5 % Finance Leases PHI Pepco DPL ACE As of December 31, 2022 2.3 % 2.3 % 2.3 % 2.4 % As of December 31, 2021 2.2 % 2.3 % 2.1 % 2.1 % As of December 31, 2020 2.5 % 2.6 % 2.4 % 2.4 % Future minimum lease payments for operating and finance leases as of December 31, 2022 were as follows: Operating Leases Year Exelon ComEd PECO BGE PHI Pepco DPL ACE 2023 $ 52 $ 2 $ — $ 1 $ 37 $ 7 $ 10 $ 4 2024 45 — — — 35 6 9 3 2025 43 — — — 34 6 7 2 2026 39 — — — 30 5 5 1 2027 39 — — — 29 4 6 1 Remaining years 161 — 1 18 67 20 25 — Total 379 2 1 19 232 48 62 11 Interest 73 — — 15 34 8 12 1 Total operating lease liabilities $ 306 $ 2 $ 1 $ 4 $ 198 $ 40 $ 50 $ 10 Finance Leases Year PHI Pepco DPL ACE 2023 $ 14 $ 5 $ 6 $ 3 2024 14 5 6 3 2025 15 5 6 4 2026 15 5 6 4 2027 12 4 5 3 Remaining years 12 4 5 3 Total 82 28 34 20 Interest 6 3 2 1 Total finance lease liabilities $ 76 $ 25 $ 32 $ 19 Cash paid for amounts included in the measurement of operating and finance lease liabilities were as follows: Operating cash flows from operating leases Exelon ComEd PECO BGE PHI Pepco DPL ACE For the year ended December 31, 2022 $ 66 $ 3 $ — $ 16 $ 37 $ 8 $ 9 $ 4 For the year ended December 31, 2021 93 3 — 46 39 8 9 4 For the year ended December 31, 2020 67 3 1 20 39 8 9 4 Financing cash flows from finance leases PHI Pepco DPL ACE For the year ended December 31, 2022 $ 13 $ 5 $ 5 $ 3 For the year ended December 31, 2021 10 3 4 3 For the year ended December 31, 2020 6 2 3 1 ROU assets obtained in exchange for operating and finance lease obligations were as follows: Operating Leases Exelon ComEd PECO BGE PHI Pepco DPL ACE For the year ended December 31, 2022 $ 46 $ — $ — $ — $ 2 $ — $ 1 $ 1 For the year ended December 31, 2021 1 — — (1) 1 — 1 — For the year ended December 31, 2020 (2) — 1 — (1) — (1) — Finance Leases PHI Pepco DPL ACE For the year ended December 31, 2022 $ 14 $ 4 $ 7 $ 3 For the year ended December 31, 2021 32 12 12 8 For the year ended December 31, 2020 29 8 14 7
Leases of Lessor Disclosure [Text Block]	Lessor The Registrants have operating leases for which they are the lessors. The following tables outline the significant types of leases at each registrant and other terms and conditions of their lease agreements as of December 31, 2022. ACE did not have any operating leases for which they are the lessors for the years ended December 31, 2022 and 2021. During 2020, ACE was the lessor for an operating lease, which expired in that year and resulted in less than $1 million in operating lease income. Exelon ComEd PECO BGE PHI Pepco DPL Real estate ● ● ● ● ● ● ● (in years) Exelon ComEd PECO BGE PHI Pepco DPL Remaining lease terms 1-80 1-14 1-80 20 1-10 1-3 9-10 Options to extend the term 5-79 5-79 5-50 N/A N/A N/A N/A The components of lease income were as follows: Exelon ComEd PECO BGE PHI Pepco DPL For the year ended December 31, 2022 Operating lease income $ 4 $ — $ — $ — $ 4 $ — $ 3 Variable lease income 1 — — — 1 — 1 For the year ended December 31, 2021 Operating lease income $ 5 $ — $ — $ — $ 4 $ — $ 3 Variable lease income 1 — — — 1 — 1 For the year ended December 31, 2020 Operating lease income $ 5 $ — $ — $ — $ 3 $ — $ 3 Variable lease income 1 — — — 1 — 1 Future minimum lease payments to be recovered under operating leases as of December 31, 2022 were as follows: Year Exelon ComEd PECO BGE PHI Pepco DPL 2023 $ 5 $ 1 $ — $ — $ 4 $ — $ 3 2024 5 1 — — 3 — 3 2025 5 — — — 4 — 5 2026 5 — — — 5 — 4 2027 5 — — — 5 — 4 Remaining years 27 — 4 1 23 — 22 Total $ 52 $ 2 $ 4 $ 1 $ 44 $ — $ 41

Asset Impairments (Exelon and B

Asset Impairments (Exelon and BGE)	12 Months Ended
Asset Impairments (Exelon and BGE)	Dec. 31, 2022
Impairment or Disposal of Tangible Assets Disclosure [Abstract]
Asset Impairments (Exelon and BGE)	Asset Impairments (Exelon and BGE)In the third quarter of 2022, a review of the impacts of COVID-19 on office use resulted in plans to cease the renovation and dispose of an office building at BGE before the asset was placed into service. BGE determined that the carrying value was not recoverable and that its fair value was less than carrying value. As a result, in 2022, a pre-tax impairment charge of $48 million was recorded in Operating and maintenance expense in Exelon’s and BGE’s Consolidated Statements of Operations and Comprehensive Income. The fair value used in the analysis was based on an estimate of an expected sales price. However, the office building did not meet all of the criteria for classification as held for sale as of December 31, 2022, and therefore continues to be reported within Property, plant and equipment in Exelon’s and BGE’s Balance Sheets as of December 31, 2022.

Intangible Assets (Exelon, ComE

Intangible Assets (Exelon, ComEd, PHI, Pepco, DPL, and ACE)	12 Months Ended
Intangible Assets (Exelon, ComEd, PHI, Pepco, DPL, and ACE)	Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible Assets (Exelon, ComEd, PHI, Pepco, DPL, and ACE)	Intangible Assets Goodwill (Exelon, ComEd, PHI, Pepco, DPL, and ACE) The following table presents the gross amount, accumulated impairment loss, and carrying amount of goodwill at Exelon, ComEd, and PHI as of December 31, 2022 and 2021. There were no additions or impairments during the years ended December 31, 2022 and 2021. Gross Amount Accumulated Impairment Loss Carrying Amount Exelon $ 8,613 $ 1,983 $ 6,630 ComEd (a) 4,608 1,983 2,625 PHI (b) 4,005 — 4,005 __________ (a) Reflects goodwill recorded in 2000 from the PECO/Unicom merger (predecessor parent company of ComEd). (b) Reflects goodwill recorded in 2016 from the PHI merger. Goodwill is not amortized, but is subject to an assessment for impairment at least annually, or more frequently if events occur or circumstances change that would more likely than not reduce the fair value of ComEd's and PHI's reporting units below their carrying amounts. A reporting unit is an operating segment or one level below an operating segment (known as a component) and is the level at which goodwill is assessed for impairment. A component of an operating segment is a reporting unit if the component constitutes a business for which discrete financial information is available and its operating results are regularly reviewed by segment management. ComEd has a single operating segment. PHI's operating segments are Pepco, DPL, and ACE. See Note 5 — Segment Information for additional information. There is no level below these operating segments for which operating results are regularly reviewed by segment management. Therefore, the ComEd, Pepco, DPL, and ACE operating segments are also considered reporting units for goodwill impairment assessment purposes. Exelon's and ComEd's $2.6 billion of goodwill has been assigned entirely to the ComEd reporting unit, while Exelon's and PHI's $4.0 billion of goodwill has been assigned to the Pepco, DPL, and ACE reporting units in the amounts of $2.1 billion, $1.4 billion, and $0.5 billion, respectively. Entities assessing goodwill for impairment have the option of first performing a qualitative assessment to determine whether a quantitative assessment is necessary. As part of the qualitative assessments, Exelon, ComEd, and PHI evaluate, among other things, management's best estimate of projected operating and capital cash flows for their businesses, outcomes of recent regulatory proceedings, changes in certain market conditions, including the discount rate and regulated utility peer EBITDA multiples, and the passing margin from their last quantitative assessments performed. If an entity bypasses the qualitative assessment, a quantitative, fair value-based assessment is performed, which compares the fair value of the reporting unit to its carrying amount, including goodwill. If the carrying amount of the reporting unit exceeds its fair value, the entity recognizes an impairment charge, which is limited to the amount of goodwill allocated to the reporting unit. Application of the goodwill impairment assessment requires management judgment, including the identification of reporting units and determining the fair value of the reporting unit, which management estimates using a weighted combination of a discounted cash flow analysis and a market multiples analysis. Significant assumptions used in these fair value analyses include discount and growth rates, utility sector market performance and transactions, projected operating and capital cash flows for ComEd's, Pepco's, DPL's, and ACE's businesses, and the fair value of debt. 2022 and 2021 Goodwill Impairment Assessment. ComEd and PHI qualitatively determined that it was more likely than not that the fair values of their reporting units exceeded their carrying values and, therefore, did not perform quantitative assessments as of November 1, 2022 and 2021. The last quantitative assessments performed were as of November 1, 2016 for ComEd and November 1, 2018 for PHI. While the annual assessments indicated no impairments, certain assumptions used to estimate reporting unit fair values are highly sensitive to changes. Adverse regulatory actions or changes in significant assumptions could potentially result in future impairments of Exelon's, ComEd's, and PHI’s goodwill, which could be material. Other Intangible Assets and Liabilities (Exelon and PHI) Exelon’s other intangible assets, included in Other current assets and Other deferred debits and other assets in the Consolidated Balance Sheets, consisted of the following as of December 31, 2022 and 2021. Exelon's and PHI's other intangible liabilities, included in current and noncurrent Unamortized energy contract liabilities in their Consolidated Balance Sheets, consisted of the following as of December 31, 2022 and 2021. The intangible assets and liabilities shown below are amortized on a straight-line basis, except for unamortized energy contracts which are amortized in relation to the expected realization of the underlying cash flows: December 31, 2022 December 31, 2021 Gross Accumulated Amortization Net Gross Accumulated Amortization Net Exelon Unamortized Energy Contracts $ (1,515) $ 1,470 $ (45) $ (1,515) $ 1,280 $ (235) Software License 81 (61) 20 81 (53) 28 Exelon Total $ (1,434) $ 1,409 $ (25) $ (1,434) $ 1,227 $ (207) PHI Unamortized Energy Contracts $ (1,515) $ 1,470 $ (45) $ (1,515) $ 1,280 $ (235) The following table summarizes the amortization expense related to intangible assets and liabilities for each of the years ended December 31, 2022, 2021, and 2020: For the Years Ended December 31, Exelon (a) PHI (a) 2022 (b) $ (182) $ (190) 2021 (83) (92) 2020 (98) (115) __________ (a) For PHI unamortized energy contracts, the amortization of the fair value adjustment amounts and the corresponding offsetting regulatory asset amounts are amortized through Purchased power and fuel expense in their Consolidated Statements of Operations and Comprehensive Income resulting in no effect to net income. (b) On March 23, 2022, the NJBPU approved a petition by ACE to terminate the provisions in its PPAs. As such, the contract was fully amortized during the year ended December 31, 2022. See Note 3 - Regulatory Matters for additional information. The following table summarizes the estimated future amortization expense related to intangible assets and liabilities as of December 31, 2022: For the Years Ending December 31, Exelon PHI 2023 $ (2) $ (10) 2024 — (8) 2025 (2) (5) 2026 (5) (5) 2027 (4) (4)

Income Taxes (All Registrants)

Income Taxes (All Registrants)	12 Months Ended
Income Taxes (All Registrants)	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Income Taxes (All Registrants)	Income Taxes (All Registrants) Components of Income Tax Expense or Benefit Income tax expense (benefit) from continuing operations is comprised of the following components: For the Year Ended December 31, 2022 Exelon ComEd PECO BGE PHI Pepco DPL ACE Included in operations: Federal Current $ (24) $ 29 $ 13 $ (1) $ 16 $ 9 $ (2) $ 6 Deferred 106 117 18 (3) (23) (2) 2 (15) Investment tax credit amortization (3) (1) — — (1) — — — State Current (13) (6) (4) — 2 — — — Deferred 283 125 52 12 15 (16) 14 12 Total $ 349 $ 264 $ 79 $ 8 $ 9 $ (9) $ 14 $ 3 For the Year Ended December 31, 2021 Exelon ComEd PECO BGE PHI Pepco DPL ACE Included in operations: Federal Current $ (152) $ (30) $ 1 $ (18) $ 18 $ 22 $ 2 $ 1 Deferred 89 113 20 34 (52) (17) (14) (26) Investment tax credit amortization (2) (1) — — (1) — — — State Current (46) (41) — — — 1 1 — Deferred 149 131 (9) (51) 77 9 53 12 Total $ 38 $ 172 $ 12 $ (35) $ 42 $ 15 $ 42 $ (13) For the Year Ended December 31, 2020 Exelon ComEd PECO BGE PHI Pepco DPL ACE Included in operations: Federal Current $ (180) $ (24) $ (7) $ 4 $ 25 $ 40 $ (13) $ (4) Deferred 10 112 1 10 (129) (62) (20) (43) Investment tax credit amortization (3) (2) — — (1) — — — State Current (37) (27) — — (5) — — — Deferred 203 118 (24) 27 33 15 8 6 Total $ (7) $ 177 $ (30) $ 41 $ (77) $ (7) $ (25) $ (41) Rate Reconciliation The effective income tax rate from continuing operations varies from the U.S. federal statutory rate principally due to the following: For the Year Ended December 31, 2022 (a) Exelon ComEd PECO (b) BGE (b) PHI (b) Pepco (b) DPL (b) ACE (b) U.S. federal statutory rate 21.0 % 21.0 % 21.0 % 21.0 % 21.0 % 21.0 % 21.0 % 21.0 % Increase (decrease) due to: State income taxes, net of Federal income tax benefit (c) 8.8 8.0 5.8 2.6 2.1 (4.1) 6.5 6.9 Plant basis differences (4.1) (0.6) (11.9) (1.0) (1.7) (2.7) (0.7) (0.7) Excess deferred tax amortization (11.8) (5.6) (3.0) (19.8) (19.5) (16.8) (18.4) (24.5) Amortization of investment tax credit, including deferred taxes on basis differences (0.1) (0.1) — (0.1) (0.1) — (0.2) (0.2) Tax credits (d) 0.1 (0.3) — (0.7) (0.7) (0.7) (0.6) (0.5) Other (e) 0.6 — 0.2 0.1 0.4 0.3 0.1 — Effective income tax rate 14.5 % 22.4 % 12.1 % 2.1 % 1.5 % (3.0) % 7.7 % 2.0 % For the Year Ended December 31, 2021 (a) Exelon ComEd PECO (f) BGE (f) PHI Pepco (f) DPL (f) ACE (f) U.S. federal statutory rate 21.0 % 21.0 % 21.0 % 21.0 % 21.0 % 21.0 % 21.0 % 21.0 % Increase (decrease) due to: State income taxes, net of federal income tax benefit 5.0 7.8 (1.4) (10.8) 10.1 2.7 25.0 7.4 Plant basis differences (5.4) (0.8) (13.6) (1.7) (1.1) (1.6) (0.8) (0.2) Excess deferred tax amortization (17.2) (7.6) (3.8) (16.3) (22.4) (16.4) (20.0) (37.1) Amortization of investment tax credit, including deferred taxes on basis differences (0.1) (0.1) — (0.1) (0.1) — (0.2) (0.2) Tax credits (0.7) (0.5) — (0.9) (0.5) (0.5) (0.4) (0.5) Other (0.3) (1.0) 0.1 (0.6) — (0.4) 0.1 (0.2) Effective income tax rate 2.3 % 18.8 % 2.3 % (9.4) % 7.0 % 4.8 % 24.7 % (9.8) % For the Year Ended December 31, 2020 (a) Exelon ComEd (g) PECO (g) BGE (h) PHI (h) Pepco (h) DPL (h) ACE (h) U.S. federal statutory rate 21.0 % 21.0 % 21.0 % 21.0 % 21.0 % 21.0 % 21.0 % 21.0 % Increase (decrease) due to: State income taxes, net of federal income tax benefit 11.9 11.6 (4.5) 5.5 5.1 4.5 6.6 7.0 Plant basis differences (8.6) (0.6) (18.7) (1.5) (1.6) (1.7) (0.4) (3.0) Excess deferred tax amortization (29.1) (11.2) (4.6) (13.9) (42.0) (25.4) (51.7) (82.1) Amortization of investment tax credit, including deferred taxes on basis differences (0.3) (0.3) — (0.1) (0.2) (0.1) (0.3) (0.5) Tax credits (0.5) (0.3) — (0.4) (0.3) (0.3) (0.3) (0.5) Deferred Prosecution Agreement payments 3.8 6.8 — — — — — — Other 1.2 1.8 (0.4) (0.1) (0.4) (0.7) 0.1 0.4 Effective income tax rate (0.6) % 28.8 % (7.2) % 10.5 % (18.4) % (2.7) % (25.0) % (57.7) % __________ (a) Positive percentages represent income tax expense. Negative percentages represent income tax benefit. (b) For PECO, the lower effective tax rate is primarily related to plant basis differences attributable to tax repair deductions partially offset by higher state income taxes, net of federal income tax benefit, related to a one-time expense of $38 million attributable to the change in the Pennsylvania corporate income tax rate. For BGE, PHI, Pepco, DPL, and ACE, the lower effective tax rate is primarily related to the acceleration of certain income tax benefits due to distribution and transmission rate case settlements. (c) For Exelon, the higher state income taxes, net of federal income tax benefit, is primarily due to the long-term marginal state income tax rate change of $67 million and the recognition of a valuation allowance of $40 million against the net deferred tax asset position for certain standalone state filing jurisdictions, partially offset by a one-time impact associated with a state tax benefit of $43 million and indemnification adjustments pursuant to the Tax Matters Agreement of $11 million as a result of the separation. For PECO, the higher state income taxes, net of federal income tax benefit, related to a one-time expense of $38 million attributable to the change in the Pennsylvania corporate income tax rate. (d) For Exelon, reflects the income tax expense related to the write-off of federal tax credits subject to recapture of $15 million as a result of the separation. (e) For Exelon, reflects the nondeductible transaction costs of approximately $12 million arising as part of the separation and indemnification adjustments pursuant to the Tax Matters Agreement of $9 million. (f) For PECO, the lower effective tax rate is primarily related to plant basis differences attributable to tax repair deductions. For BGE, the income tax benefit is primarily due to the Maryland multi-year plan which resulted in the acceleration of certain income tax benefits. For Pepco, the lower effective tax rate is primarily related to the acceleration of certain income tax benefits due to distribution and transmission rate case settlements. For DPL, the higher effective tax rate is primarily related to a state income tax expense, net of federal income tax benefit, due to the recognition of a valuation allowance of approximately $31 million against a deferred tax asset associated with Delaware net operating loss carryforwards as a result of a change in Delaware tax law. For ACE, the income tax benefit is primarily due to a distribution rate case settlement which allows ACE to retain certain tax benefits. (g) For ComEd, the higher effective tax rate is primarily related to the nondeductible DPA payments. For PECO, the negative effective tax rate is primarily related to an increase in plant basis differences attributable to tax repair deductions related to an increase in storms and qualifying projects in 2021. (h) For BGE, PHI, Pepco, DPL, and ACE, the income tax benefit is primarily attributable to accelerated amortization of transmission related deferred income tax regulatory liabilities as a result of regulatory settlements. See Note 3 — Regulatory Matters for additional information. Tax Differences and Carryforwards The tax effects of temporary differences and carryforwards, which give rise to significant portions of the deferred tax assets (liabilities), as of December 31, 2022 and 2021 are presented below: As of December 31, 2022 Exelon ComEd PECO BGE PHI Pepco DPL ACE Plant basis differences $ (12,130) $ (4,823) $ (2,119) $ (1,949) $ (3,131) $ (1,394) $ (906) $ (813) Accrual based contracts 10 — — — 10 — — — Derivatives and other financial instruments 26 23 — — 2 — — — Deferred pension and postretirement obligation 551 (300) (31) (31) (80) (76) (39) (3) Deferred debt refinancing costs 132 (5) — (2) 111 (4) (2) (1) Regulatory assets and liabilities (1,107) (131) (169) 57 (50) 7 43 11 Tax loss carryforward, net of valuation allowances 250 — 33 72 71 3 20 46 Tax credit carryforward 468 — — — — — — — Investment in partnerships (21) — — — — — — — Other, net 591 223 73 23 182 83 16 28 Deferred income tax liabilities (net) $ (11,230) $ (5,013) $ (2,213) $ (1,830) $ (2,885) $ (1,381) $ (868) $ (732) Unamortized investment tax credits (14) (8) — (2) (4) (1) (1) (2) Total deferred income tax liabilities (net) and unamortized investment tax credits $ (11,244) $ (5,021) $ (2,213) $ (1,832) $ (2,889) $ (1,382) $ (869) $ (734) As of December 31, 2021 Exelon ComEd PECO BGE PHI Pepco DPL ACE Plant basis differences $ (11,606) $ (4,648) $ (2,271) $ (1,826) $ (2,976) $ (1,321) $ (853) $ (777) Accrual based contracts 56 — — — 56 — — — Derivatives and other financial instruments 63 61 — — 2 — — — Deferred pension and postretirement obligation 641 (308) (32) (37) (90) (76) (40) (6) Deferred debt refinancing costs 146 (6) — (2) 123 (2) (1) (1) Regulatory assets and liabilities (1,130) 8 (280) 92 (53) 24 55 31 Tax loss carryforward, net of valuation allowances 242 — 65 68 64 2 18 42 Tax credit carryforward 584 — — — — — — — Investment in partnerships (21) — — — — — — — Other, net 449 216 97 21 212 99 19 34 Deferred income tax liabilities (net) $ (10,576) $ (4,677) $ (2,421) $ (1,684) $ (2,662) $ (1,274) $ (802) $ (677) Unamortized investment tax credits (15) (8) — (2) (5) (1) (1) (2) Total deferred income tax liabilities (net) and $ (10,591) $ (4,685) $ (2,421) $ (1,686) $ (2,667) $ (1,275) $ (803) $ (679) The following table provides Exelon’s, PECO’s, BGE’s, PHI’s, Pepco’s, DPL’s, and ACE’s carryforwards, of which the state related items are presented on a post-apportioned basis, as well as, any corresponding valuation allowances as of December 31, 2022. ComEd does not have net operating losses or credit carryforwards for the year ended December 31, 2022. Exelon PECO BGE PHI Pepco DPL ACE Federal Federal general business credits carryforwards (a) $ 468 $ — $ — $ — $ — $ — $ — State State net operating loss carryforwards 4,991 970 1,142 1,501 50 768 651 Deferred taxes on state tax attributes (net of federal taxes) 307 37 72 104 3 52 46 Valuation allowance on state tax attributes (net of federal taxes) (b) 57 4 — 33 — 32 — Year in which net operating loss or credit carryforwards will begin to expire (c) 2035 2032 2033 2029 N/A 2032 2031 __________ (a) For Exelon, the federal general business credit carryforward will begin expiring in 2035. (b) For Exelon, a full valuation allowance has been recorded against certain separate company state net operating loss carryforwards that are expected to expire before realization. For PECO, a valuation allowance has been recorded against certain Pennsylvania net operating losses that are expected to expire before realization. For DPL, a full valuation allowance has been recorded against Delaware net operating losses carryforwards due to a change in Delaware tax law. (c) A portion of Exelon's, BGE's, Pepco's, and DPL's Maryland state net operating loss carryforward have an indefinite carryforward period. Tabular Reconciliation of Unrecognized Tax Benefits The following table presents changes in unrecognized tax benefits, for Exelon, PHI, and ACE. ComEd's, PECO's, BGE's, Pepco's, and DPL's amounts are not material. Exelon (a) PHI ACE Balance at January 1, 2020 $ 95 $ 48 $ 14 Change to positions that only affect timing 6 3 1 Increases based on tax positions related to 2020 3 — — Increases based on tax positions prior to 2020 26 1 — Decreases based on tax positions prior to 2020 (5) — — Balance at December 31, 2020 125 52 15 Change to positions that only affect timing 13 3 1 Increases based on tax positions related to 2021 4 1 — Increases based on tax positions prior to 2021 4 — — Decreases based on tax positions prior to 2021 (3) — — Balance at December 31, 2021 143 56 16 Change to positions that only affect timing (1) 1 1 Increases based on tax positions related to 2022 3 2 — Increases based on tax positions prior to 2022 3 — — Decreases based on tax positions prior to 2022 — — — Balance at December 31, 2022 $ 148 $ 59 $ 17 ______ (a) As of December 31, 2022, Exelon recorded a receivable of $50 million in noncurrent Other assets in the Consolidated Balance Sheet for Constellation’s share of unrecognized tax benefits for periods prior to the separation. Recognition of unrecognized tax benefits The following table presents Exelon's unrecognized tax benefits that, if recognized, would decrease the effe ctive tax rate. The Utility Registrants' amounts are not material. Exelon December 31, 2022 $ 90 December 31, 2021 77 December 31, 2020 73 Reasonably possible the total amount of unrecognized tax benefits could significantly increase or decrease within 12 months after the reporting date As of December 31, 2022, ACE has approximately $14 million of unrecognized state tax benefits that could significantly decrease within the 12 months after the reporting date based on the outcome of pending court cases involving other taxpayers. The unrecognized tax benefit, if recognized, may be included in future base rates and that portion would have no impact to the effective tax rate. Total amounts of interest and penalties recognized The following table represents the net interest and penalties receivable (payable) related to tax positions reflected in Exelon's Consolidated Balance Sheets. The Utility Registrants' amounts are not material. Net interest and penalties receivable as of Exelon December 31, 2022 (a) (b) $ 45 December 31, 2021 (c) 43 __________ (a) As of December 31, 2022, the interest receivable balance is not expected to be settled in cash within the next twelve months and is therefore classified as a noncurrent receivable. (b) As of December 31, 2022, Exelon recorded a receivable of $1 million in noncurrent Other assets in the Consolidated Balance Sheet for Constellation's share of net interest for periods prior to the separation. (c) As of December 31, 2021, the interest receivable balance is not expected to be settled in cash within the next twelve months and is therefore classified as a noncurrent receivable. In December of 2021, Exelon received a refund of approximately $272 million related to an interest netting refund claim. The Registrants did not record material interest and penalty expense related to tax positions reflected in their Consolidated Balance Sheets. Interest expense and penalty expense are recorded in Interest expense, net and Other, net, respect ively, in Other income and deductions in the Registrants' Consolidated Statements of Operations and Comprehensive Income. Description of tax years open to assessment by major jurisdiction Major Jurisdiction Open Years Registrants Impacted Federal consolidated income tax returns (a) 2010-2021 All Registrants Delaware separate corporate income tax returns Same as federal DPL District of Columbia combined corporate income tax returns 2019-2021 Exelon, PHI, Pepco Illinois unitary corporate income tax returns 2012-2021 Exelon, ComEd Maryland separate company corporate net income tax returns Same as federal BGE, Pepco, DPL New Jersey separate corporate income tax returns 2017-2018 Exelon New Jersey combined corporate income tax returns 2019-2021 Exelon New Jersey separate corporate income tax returns 2018-2021 ACE New York combined corporate income tax returns 2015-2021 Exelon Pennsylvania separate corporate income tax returns 2011-2016 Exelon Pennsylvania separate corporate income tax returns 2019-2021 Exelon Pennsylvania separate corporate income tax returns 2019-2021 PECO __________ (a) Certain registrants are only open to assessment for tax years since joining the Exelon federal consolidated group; BGE beginning in 2012 and PHI, Pepco, DPL, and ACE beginning in 2016. Other Tax Matters Separation (Exelon) In the first quarter of 2022, in connection with the separation, Exelon recorded an income tax expense related to continuing operations of $148 million primarily due to the long-term marginal state income tax rate change of $67 million discussed further below, the recognition of valuation allowances of approximately $40 million against the net deferred tax assets positions for certain standalone state filing jurisdictions, the write-off of federal and state tax credits subject to recapture of $17 million, and nondeductible transaction costs for federal and state taxes of $24 million. Tax Matters Agreement (Exelon) In connection with the separation, Exelon entered into a TMA with Constellation. The TMA governs the respective rights, responsibilities, and obligations between Exelon and Constellation after the separation with respect to tax liabilities, refunds and attributes for open tax years that Constellation was part of Exelon’s consolidated group for U.S. federal, state, and local tax purposes. Indemnification for Taxes. As a former subsidiary of Exelon, Constellation has joint and several liability with Exelon to the IRS and certain state jurisdictions relating to the taxable periods prior to the separation. The TMA specifies that Constellation is liable for their share of taxes required to be paid by Exelon with respect to taxable periods prior to the separation to the extent Constellation would have been responsible for such taxes under the existing Exelon tax sharing agreement. As a result, as of March 31, 2022, Exelon recorded a receivable of $55 million in Current other assets in the Consolidated Balance Sheet for Constellation’s share of taxes for periods prior to the separation. As of December 31, 2022, Exelon recorded a payable of $18 million in Current other liabilities that is due to Constellation. Tax Refunds. The TMA specifies that Constellation is entitled to their share of any future tax refunds claimed by Exelon with respect to taxable periods prior to the separation to the extent that Constellation would have received such tax refunds under the existing Exelon tax sharing agreement. Tax Attributes . At the date of separation certain tax attributes, primarily pre-closing tax credit carryforwards, that were generated by Constellation were required by law to be allocated to Exelon. The TMA also provides that Exelon will reimburse Constellation when those allocated tax attribute carryforwards are utilized. As of March 31, 2022, Exelon recorded a payable of $11 million and $484 million in Current other liabilities and Noncurrent other liabilities, respectively, in the Consolidated Balance Sheet for tax credit carryforwards that are expected to be utilized and reimbursed to Constellation. As of December 31, 2022, the current and noncurrent payable amounts are $169 million and $362 million, respectively. Long-Term Marginal State Income Tax Rate (All Registrants) Quarterly, Exelon reviews and updates its marginal state income tax rates for material changes in state tax laws and state apportionment. The Registrants remeasure their existing deferred income tax balances to reflect the changes in marginal rates, which results in either an increase or a decrease to their net deferred income tax liability balances. Utility Registrants record corresponding regulatory liabilities or assets to the extent such amounts are probable of settlement or recovery through customer rates and an adjustment to income tax expense for all other amounts. In the first quarter of 2022, Exelon updated its marginal state income tax rates for changes in state apportionment due to the separation, which resulted in an increase of $67 million to the deferred tax liability at Exelon, and a corresponding adjustment to income tax expense, net of federal taxes. The impacts to ComEd, BGE, PHI, Pepco, DPL, and ACE for the years ended December 31, 2022, 2021, and 2020 were not material. December 31, 2022 Exelon Increase to Deferred Income Tax Liability and Income Tax Expense, Net of Federal Taxes $ 67 December 31, 2021 Increase to Deferred Income Tax Liability and Income Tax Expense, Net of Federal Taxes $ 27 December 31, 2020 Increase to Deferred Income Tax Liability and Income Tax Expense, Net of Federal Taxes $ 66 Pennsylvania Corporate Income Tax Rate Change (Exelon and PECO) On July 8, 2022, Pennsylvania enacted House Bill 1342, which will permanently reduce the corporate income tax rate from 9.99% to 4.99%. The tax rate will be reduced to 8.99% for the 2023 tax year. Starting with the 2024 tax year, the rate is reduced by 0.50% annually until it reaches 4.99% in 2031. As a result of the rate change, in the third quarter of 2022, Exelon and PECO recorded a one-time decrease to deferred income taxes of $390 million with a corresponding decrease to the deferred income taxes regulatory asset of $428 million for the amounts that are expected to be settled through future customer rates and an increase to income tax expense of $38 million (net of federal taxes). The tax rate decrease is not expected to have a material ongoing impact to Exelon’s and PECO’s financial statements. PECO did not update its marginal state income tax rates for the years ended December 31, 2021 and 2020. Allocation of Tax Benefits (All Registrants) The Utility Registrants are party to an agreement with Exelon and other subsidiaries of Exelon that provides for the allocation of consolidated tax liabilities and benefits (Tax Sharing Agreement). The Tax Sharing Agreement provides that each party is allocated an amount of tax similar to that which would be owed had the party been separately subject to tax. In addition, any net federal and state benefits attributable to Exelon are reallocated to the other Registrants. That allocation is treated as a contribution from Exelon to the party receiving the benefit. The following table presents the allocation of tax benefits from Exelon under the Tax Sharing Agreement, for the year ended December 31, 2022, 2021, and 2020. ComEd PECO BGE PHI Pepco DPL ACE December 31, 2022 (a) $ 1 $ 47 $ — $ 28 $ 23 $ 3 $ 2 December 31, 2021 (b) 1 19 — 17 16 — — December 31, 2020 (c) 14 17 — 17 8 6 1 __________ (a) BGE did not record an allocation of federal tax benefits from Exelon under the Tax Sharing Agreement as a result of a tax net operating loss. (b) BGE, DPL, and ACE did not record an allocation of federal tax benefits from Exelon under the Tax Sharing Agreement as a result of a tax net operating loss. (c) BGE did not record an allocation of federal tax benefits from Exelon under the Tax Sharing Agreement as a result of a tax net operating loss.

Retirement Benefits (All Regist

Retirement Benefits (All Registrants)	12 Months Ended
Retirement Benefits (All Registrants)	Dec. 31, 2022
Retirement Benefits [Abstract]
Retirement Benefits (All Registrants)	Retirement Benefits (All Registrants) Exelon sponsors defined benefit pension plans and OPEB plans for essentially all current employees. Substantially all non-union employees and electing union employees hired on or after January 1, 2001 participate in cash balance pension plans. Effective January 1, 2009, substantially all newly-hired union-represented employees participate in cash balance pension plans. Effective February 1, 2018 for most newly-hired BSC non-represented, non-craft, employees, January 1, 2021 for most newly-hired utility management employees, and for certain newly-hired union employees pursuant to their collective bargaining agreements, these newly-hired employees are not eligible for pension benefits, and will instead be eligible to receive an enhanced non-discretionary employer contribution in an Exelon defined contribution savings plan. Effective January 1, 2018, most newly-hired non-represented, non-craft, employees are not eligible for OPEB benefits and employees represented by Local 614 are not eligible for retiree health care benefits. Effective January 1, 2021, most non-represented, non-craft, employees who are under the age of 40 are not eligible for retiree health care benefits. Effective January 1, 2022, management employees retiring on or after that date are no longer eligible for retiree life insurance benefits. Effective February 1, 2022, in connection with the separation, pension and OPEB obligations and assets for current and former employees of the Constellation business and certain other former employees of Exelon and its subsidiaries transferred to pension and OPEB plans and trusts maintained by Constellation or its subsidiaries. The Exelon New England Union Employees Pension Plan and Constellation Mystic Power, LLC Union Employees Pension Plan Including Plan A and Plan B were transferred. The following OPEB plans were also transferred: Constellation Mystic Power, LLC Post-Employment Medical Savings Account Plan; Exelon New England Union Post-Employment Medical Savings Account Plan; and the Nine Mile Point Nuclear Station, LLC Medical Care and Prescription Drug Plan for Retired Employees. As a result of the separation, Exelon restructured certain of its qualified pension plans. Pension obligations and assets for current and former employees continuing with Exelon and who were participants in the Exelon Employee Pension Plan for Clinton, TMI, and Oyster Creek, Pension Plan of Constellation Energy Nuclear Group, LLC, and Nine Mile Point Pension Plan were merged into the Pension Plan of Constellation Energy Group, Inc, which was subsequently renamed, Exelon Pension Plan (EPP). Exelon employees who participated in these plans prior to the separation now participate in the EPP. The merging of the plans did not change the benefits offered to the plan participants and, thus, had no impact on Exelon's pension obligations. The tables below show the pension and OPEB plans in which employees of each operating company participated as of December 31, 2022: Operating Company (e) Name of Plan: ComEd PECO BGE PHI Pepco DPL ACE Qualified Pension Plans: Exelon Corporation Retirement Program (a) X X X X X X X Exelon Corporation Pension Plan for Bargaining Unit Employees (a) X Exelon Pension Plan (b) X X X X X X X Pepco Holdings LLC Retirement Plan (d) X X X X X X X Non-Qualified Pension Plans: Exelon Corporation Supplemental Pension Benefit Plan and 2000 Excess Benefit Plan (a) X X X Exelon Corporation Supplemental Management Retirement Plan (a) X X X X X Constellation Energy Group, Inc. Senior Executive Supplemental Plan (b) X X Constellation Energy Group, Inc. Supplemental Pension Plan (b) X X Constellation Energy Group, Inc. Benefits Restoration Plan (b) X X X Baltimore Gas & Electric Company Executive Benefit Plan (b) X Baltimore Gas & Electric Company Manager Benefit Plan (b) X X Pepco Holdings LLC 2011 Supplemental Executive Retirement Plan (d) X X X X Conectiv Supplemental Executive Retirement Plan (d) X X X Pepco Holdings LLC Combined Executive Retirement Plan (d) X X Operating Company (e) Name of Plan: ComEd PECO BGE PHI Pepco DPL ACE OPEB Plans: PECO Energy Company Retiree Medical Plan (a) X X X X X X X Exelon Corporation Health Care Program (a) X X X X X X X Exelon Corporation Employees’ Life Insurance Plan (a) X X X Exelon Corporation Health Reimbursement Arrangement Plan (a) X X X BGE Retiree Medical Plan (b) X X X X X X BGE Retiree Dental Plan (b) X Exelon Retiree Medical Plan of Constellation Energy Nuclear Group, LLC (c) X X X Exelon Retiree Dental Plan of Constellation Energy Nuclear Group, LLC (c) X X X Pepco Holdings LLC Welfare Plan for Retirees (d) X X X X X X X __________ (a) These plans are collectively referred to as the legacy Exelon plans. (b) These plans are collectively referred to as the legacy Constellation Energy Group (CEG) Plans. (c) These plans are collectively referred to as the legacy CENG plans. (d) These plans are collectively referred to as the legacy PHI plans. (e) Employees generally remain in their legacy benefit plans when transferring between operating companies. Exelon’s traditional and cash balance pension plans are intended to be tax-qualified defined benefit plans. Exelon has elected that the trusts underlying these plans be treated as qualified trusts under the IRC. If certain conditions are met, Exelon can deduct payments made to the qualified trusts, subject to certain IRC limitations. Benefit Obligations, Plan Assets, and Funded Status As of February 1, 2022, in connection with the separation, Exelon's pension and OPEB plans were remeasured. The remeasurement and separation resulted in a decrease to the pension obligation, net of plan assets, of $921 million and a decrease to the OPEB obligation of $893 million. Additionally, accumulated other comprehensive loss, decreased by $1,994 million (after-tax) and regulatory assets and liabilities increased by $14 million and $5 million respectively. Key assumptions were held consistent with the year end December 31, 2021 assumptions with the exception of the discount rate. During the first quarter of 2022, Exelon received an updated valuation of its pension and OPEB to reflect actual census data as of February 1, 2022. This valuation resulted in a decrease to the pension obligations of $24 million and an increase to the OPEB obligations of $5 million. Additionally, accumulated other comprehensive loss increased by $5 million (after-tax) and regulatory assets and liabilities decreased by $30 million and $3 million, respectively. The following tables provide a rollforward of the changes in the benefit obligations and plan assets of Exelon for the most recent two years for all plans combined: Pension Benefits OPEB 2022 2021 2022 2021 Change in benefit obligation: Net benefit obligation as of the beginning of year $ 14,236 $ 14,861 $ 2,502 $ 2,661 Service cost 236 294 41 51 Interest cost 439 406 76 69 Plan participants’ contributions — — 26 32 Actuarial (gain) loss (a) (3,379) (442) (604) (116) Settlements — (23) — (5) Gross benefits paid (855) (860) (157) (190) Net benefit obligation as of the end of year $ 10,677 $ 14,236 $ 1,884 $ 2,502 Pension Benefits OPEB 2022 2021 2022 2021 Change in plan assets: Fair value of net plan assets as of the beginning of year $ 12,165 $ 11,883 $ 1,665 $ 1,635 Actual return on plan assets (2,359) 822 (225) 130 Employer contributions 570 343 42 63 Plan participants’ contributions — — 26 32 Gross benefits paid (855) (860) (157) (190) Settlements — (23) — (5) Fair value of net plan assets as of the end of year $ 9,521 $ 12,165 $ 1,351 $ 1,665 __________ (a) The pension and OPEB gains in 2022 and 2021 primarily reflect an increase in the discount rate. Exelon presents its benefit obligations and plan assets net on its Consolidated Balance Sheets within the following line items: Pension Benefits OPEB 2022 2021 2022 2021 Other current liabilities $ 47 $ 20 $ 26 $ 26 Pension obligations 1,109 2,051 — — Non-pension postretirement benefit obligations — — 507 811 Unfunded status (net benefit obligation less plan assets) $ 1,156 $ 2,071 $ 533 $ 837 The following table provides the ABO and fair value of plan assets for all pension plans with an ABO in excess of plan assets. Information for pension and OPEB plans with projected benefit obligations (PBO) and accumulated postretirement benefit obligation (APBO), respectively, in excess of plan assets has been disclosed in the Obligations and Plan Assets table above as all pension and OPEB plans are underfunded. Exelon ABO in Excess of Plan Assets 2022 2021 ABO $ 10,108 $ 13,497 Fair value of net plan assets 9,427 12,165 Components of Net Periodic Benefit Costs The majority of the 2022 pension benefit cost for the Exelon-sponsored plans is calculated using an expected long-term rate of return on plan assets of 7.00% and a discount rate of 3.24%. The majority of the 2022 OPEB cost is calculated using an expected long-term rate of return on plan assets of 6.44% for funded plans and a discount rate of 3.20%. A portion of the net periodic benefit cost for all plans is capitalized in the Consolidated Balance Sheets. The following table presents the components of Exelon’s net periodic benefit costs, prior to capitalization, for the years ended December 31, 2022, 2021, and 2020. Pension Benefits OPEB 2022 2021 2020 2022 2021 2020 Components of net periodic benefit cost: Service cost $ 236 $ 294 $ 251 $ 41 $ 51 $ 56 Interest cost 439 406 476 76 69 93 Expected return on assets (822) (843) (796) (99) (99) (101) Amortization of: Prior service cost (credit) 2 2 3 (19) (25) (76) Actuarial loss 295 399 349 12 27 34 Curtailment benefits — — — — — (1) Settlement and other charges — 7 6 — 1 1 Net periodic benefit cost $ 150 $ 265 $ 289 $ 11 $ 24 $ 6 Cost Allocation to Exelon Subsidiaries All Registrants account for their participation in Exelon’s pension and OPEB plans by applying multi-employer accounting. Exelon allocates costs related to its pension and OPEB plans to its subsidiaries based on both active and retired employee participation in each plan. The amounts below represent the Registrants' allocated pension and OPEB costs. For Exelon, the service cost component is included in Operating and maintenance expense and Property, plant, and equipment, net while the non-service cost components are included in Other, net and Regulatory assets. For the Utility Registrants, the service cost and non-service cost components are included in Operating and maintenance expense and Property, plant, and equipment, net in their consolidated financial statements. For the Years Ended December 31, Exelon ComEd PECO BGE PHI Pepco DPL ACE 2022 $ 161 $ 60 $ (9) $ 44 $ 53 $ 9 $ 3 $ 12 2021 288 129 8 64 49 6 2 11 2020 296 114 5 64 70 15 7 14 Components of AOCI and Regulatory Assets Exelon recognizes the overfunded or underfunded status of defined benefit pension and OPEB plans as an asset or liability on its Consolidated Balance Sheets, with offsetting entries to AOCI and regulatory assets (liabilities). A portion of current year actuarial (gains) losses and prior service costs (credits) is capitalized in Exelon’s Consolidated Balance Sheets to reflect the expected regulatory recovery of these amounts, which would otherwise be recorded to AOCI. The following tables provide the components of AOCI and regulatory assets (liabilities) for Exelon for the years ended December 31, 2022, 2021, and 2020 for all plans combined. The tables include amounts related to Generation prior to the separation. Pension Benefits OPEB 2022 2021 2020 2022 2021 2020 Changes in plan assets and benefit obligations recognized in AOCI and regulatory assets (liabilities): Current year actuarial (gain) loss $ (226) $ (700) $ 941 $ (271) $ (270) $ 22 Amortization of actuarial loss (295) (598) (512) (12) (37) (49) Separation of Constellation (2,631) — — (43) — — Current year prior service cost (credit) — — — — — (111) Amortization of prior service (cost) credit (2) (3) (4) 19 34 124 Curtailments — — — — — 1 Settlements — (27) (14) — (1) (1) Total recognized in AOCI and regulatory assets (liabilities) $ (3,154) $ (1,328) $ 411 $ (307) $ (274) $ (14) Total recognized in AOCI $ (2,719) $ (747) $ 271 $ (74) $ (130) $ 6 Total recognized in regulatory assets (liabilities) $ (435) $ (581) $ 140 $ (233) $ (144) $ (20) The following table provides the components of gross accumulated other comprehensive loss and regulatory assets (liabilities) for Exelon that have not been recognized as components of periodic benefit cost as of December 31, 2022 and 2021, respectively, for all plans combined: Pension Benefits OPEB 2022 2021 2022 2021 Prior service cost (credit) $ 19 $ 32 $ (55) $ (111) Actuarial loss (gain) 3,611 6,752 (133) 230 Total $ 3,630 $ 6,784 $ (188) $ 119 Total included in AOCI $ 873 $ 3,592 $ (21) $ 53 Total included in regulatory assets (liabilities) $ 2,757 $ 3,192 $ (167) $ 66 Average Remaining Service Period For pension benefits, Exelon amortizes its unrecognized prior service costs (credits) and certain actuarial (gains) losses, as applicable, based on participants’ average remaining service periods. For OPEB, Exelon amortizes its unrecognized prior service costs (credits) over participants’ average remaining service period to benefit eligibility age and amortizes certain actuarial (gains) losses over participants’ average remaining service period to expected retirement. The resulting average remaining service periods for pension and OPEB were as follows: 2022 2021 2020 Pension plans 12.5 12.4 12.3 OPEB plans: Benefit Eligibility Age 7.9 7.6 9.0 Expected Retirement 9.1 8.8 10.2 Assumptions The measurement of the plan obligations and costs of providing benefits under Exelon’s defined benefit and OPEB plans involves various factors, including the development of valuation assumptions and inputs and accounting policy elections. The measurement of benefit obligations and costs is impacted by several assumptions and inputs, as shown below, among other factors. When developing the required assumptions, Exelon considers historical information as well as future expectations. Expected Rate of Return. In determining the EROA, Exelon considers historical economic indicators (including inflation and GDP growth) that impact asset returns, as well as expectations regarding future long-term capital market performance, weighted by Exelon’s target asset class allocations. Mortality . The mortality assumption is composed of a base table that represents the current expectation of life expectancy of the population adjusted by an improvement scale that attempts to anticipate future improvements in life expectancy. For the years ended December 31, 2022 and 2021, Exelon’s mortality assumption utilizes the SOA 2019 base table (Pri-2012) and MP-2021 improvement scale adjusted to use Proxy SSA ultimate improvement rates. For Exelon, the following assumptions were used to determine the benefit obligations for the plans as of December 31, 2022 and 2021. Assumptions used to determine year-end benefit obligations are the assumptions used to estimate the subsequent year’s net periodic benefit costs. Pension Benefits OPEB 2022 2021 2022 2021 Discount rate (a) 5.53 % 2.92 % 5.51 % 2.88 % Investment crediting rate (b) 5.07 % 3.75 % N/A N/A Rate of compensation increase 3.75 % 3.75 % 3.75 % 3.75 % Mortality table Pri-2012 table with MP- 2021 improvement scale (adjusted) Pri-2012 table with MP- 2021 improvement scale (adjusted) Pri-2012 table with MP- 2021 improvement scale (adjusted) Pri-2012 table with MP- 2021 improvement scale (adjusted) Health care cost trend on covered charges N/A N/A Initial and ultimate rate of 5.00% Initial and ultimate trend of 5.00% __________ (a) The discount rates above represent the blended rates used to determine the majority of Exelon’s pension and OPEB obligations. Certain benefit plans used individual rates, which range from 5.46% - 5.60% and 5.49% - 5.51% for pension and OPEB plans, respectively, as of December 31, 2022 and 2.55% - 3.02% and 2.84% - 2.92% for pension and OPEB plans, respectively, as of December 31, 2021. (b) The investment crediting rate above represents a weighted average rate. The following assumptions were used to determine the net periodic benefit cost for Exelon for the years ended December 31, 2022, 2021 and 2020: Pension Benefits OPEB 2022 2021 2020 2022 2021 2020 Discount rate (a) 3.24 % 2.58 % 3.34 % 3.20 % 2.51 % 3.31 % Investment crediting rate (b) 3.75 % 3.72 % 3.82 % N/A N/A N/A Expected return on plan assets (c) 7.00 % 7.00 % 7.00 % 6.44 % 6.46 % 6.69 % Rate of compensation increase 3.75 % 3.75 % 3.75 % 3.75 % 3.75 % 3.75 % Mortality table Pri-2012 table with MP- 2021 improvement scale (adjusted) Pri-2012 table with MP - 2020 improvement scale (adjusted) Pri-2012 table with MP - 2019 improvement scale (adjusted) Pri-2012 table with MP- 2021 improvement scale (adjusted) Pri-2012 table with MP - 2020 improvement scale (adjusted) Pri-2012 table with MP - 2019 improvement scale (adjusted) Health care cost trend on covered charges N/A N/A N/A Initial and ultimate rate of 5.00% Initial and ultimate rate of 5.00% Initial and ultimate rate of 5.00% __________ (a) The discount rates above represent the blended rates used to establish the majority of Exelon’s pension and OPEB costs. Certain benefit plans used individual rates, which range from 2.55%-3.24% and 2.84%-3.20% for pension and OPEB plans, respectively, for the year ended December 31, 2022; 2.11%-2.73% and 2.45%-2.63% for pension and OPEB plans; respectively, for the year ended December 31, 2021; and 3.02%-3.44% and 3.27%-3.40% for pension and OPEB plans, respectively, for the year ended December 31, 2020. (b) The investment crediting rate above represents a weighted average rate. (c) Not applicable to pension and OPEB plans that do not have plan assets. Contributions Exelon allocates contributions related to its legacy Exelon pension and OPEB plans to its subsidiaries based on accounting cost. For legacy CEG, CENG, FitzPatrick, and PHI plans, pension and OPEB contributions are allocated to the subsidiaries based on employee participation (both active and retired). For Exelon, in connection with the separation, additional qualified pension contributions of $207 million and $33 million were completed on February 1, 2022 and March 2, 2022, respectively. The following tables provide contributions to the pension and OPEB plans: Pension Benefits OPEB 2022 2021 2020 2022 2021 2020 Exelon $ 570 $ 343 $ 306 $ 42 $ 63 $ 40 ComEd 176 174 143 8 22 5 PECO 15 17 18 3 1 — BGE 48 57 56 20 24 22 PHI 69 39 30 9 9 9 Pepco 3 2 2 8 9 9 DPL 1 1 — — — — ACE 7 3 2 — — — Management considers various factors when making pension funding decisions, including actuarially determined minimum contribution requirements under ERISA, contributions required to avoid benefit restrictions and at-risk status as defined by the Pension Protection Act of 2006 (the Act), management of the pension obligation, and regulatory implications. The Act requires the attainment of certain funding levels to avoid benefit restrictions (such as an inability to pay lump sums or to accrue benefits prospectively), and at-risk status (which triggers higher minimum contribution requirements and participant notification). The projected contributions below reflect a funding strategy to make annual contributions with the objective of achieving 100% funded status on an ABO basis over time. This funding strategy helps minimize volatility of future period required pension contributions. Based on this funding strategy and current market conditions, which are subject to change, Exelon’s estimated annual qualified pension contributions will be approximately $20 million in 2023. Unlike the qualified pension plans, Exelon’s non-qualified pension plans are not funded, given that they are not subject to statutory minimum contribution requirements. While OPEB plans are also not subject to statutory minimum contribution requirements, Exelon does fund certain of its plans. For Exelon's funded OPEB plans, contributions generally equal accounting costs, however, Exelon’s management has historically considered several factors in determining the level of contributions to its OPEB plans, including liabilities management, levels of benefit claims paid, and regulatory implications (amounts deemed prudent to meet regulatory expectations and best assure continued rate recovery). The amounts below include benefit payments related to unfunded plans. The following table provides all Registrants' planned contributions to the qualified pension plans, planned benefit payments to non-qualified pension plans, and planned contributions to OPEB plans in 2023: Qualified Pension Plans Non-Qualified Pension Plans OPEB Exelon $ 20 $ 48 $ 47 ComEd 20 3 19 PECO — 1 — BGE — 1 15 PHI — 9 11 Pepco — 1 11 DPL — — — ACE — — — Estimated Future Benefit Payments Estimated future benefit payments to participants in all of the pension plans and postretirement benefit plans as of December 31, 2022 were: Pension Benefits OPEB 2023 $ 805 $ 152 2024 775 152 2025 789 152 2026 790 152 2027 798 153 2028 through 2032 3,983 744 Total estimated future benefits payments through 2032 $ 7,940 $ 1,505 Plan Assets Investment Strategy. On a regular basis, Exelon evaluates its investment strategy to ensure that plan assets will be sufficient to pay plan benefits when due. As part of this ongoing evaluation, Exelon may make changes to its targeted asset allocation and investment strategy. Exelon has developed and implemented a liability hedging investment strategy for its qualified pension plans that has reduced the volatility of its pension assets relative to its pension liabilities. Exelon is likely to continue to gradually increase the liability hedging portfolio as the funded status of its plans improves. The overall objective is to achieve attractive risk-adjusted returns that will balance the liquidity requirements of the plans’ liabilities while striving to minimize the risk of significant losses. Trust assets for Exelon’s OPEB plans are managed in a diversified investment strategy that prioritizes maximizing liquidity and returns while minimizing asset volatility. Actual asset returns have an impact on the costs reported for the Exelon-sponsored pension and OPEB plans. The actual asset returns across Exelon’s pension and OPEB plans for the year ended December 31, 2022 were (18.69)% and (11.36)%, respectively, compared to an expected long-term return assumption of 7.00% and 6.44%, respectively. Exelon used an EROA of 7.00% and 6.50% to estimate its 2023 pension and OPEB costs, respectively. Exelon’s pension and OPEB plan target asset allocations as of December 31, 2022 and 2021 were as follows: December 31, 2022 December 31, 2021 Asset Category Pension Benefits OPEB Pension Benefits OPEB Equity securities 28 % 44 % 35 % 44 % Fixed income securities 44 % 41 % 41 % 41 % Alternative investments (a) 28 % 15 % 24 % 15 % Total 100 % 100 % 100 % 100 % __________ (a) Alternative investments include private equity, hedge funds, real estate, and private credit. Concentrations of Credit Risk. Exelon evaluated its pension and OPEB plans’ asset portfolios for the existence of significant concentrations of credit risk as of December 31, 2022. Types of concentrations that were evaluated include, but are not limited to, investment concentrations in a single entity, type of industry, foreign country, and individual fund. As of December 31, 2022, there were no significant concentrations (defined as greater than 10% of plan assets) of risk in Exelon’s pension and OPEB plan assets. Fair Value Measurements The following tables present pension and OPEB plan assets measured and recorded at fair value in Exelon's Consolidated Balance Sheets on a recurring basis and their level within the fair value hierarchy as of December 31, 2022 and 2021: December 31, 2022 December 31, 2021 Level 1 Level 2 Level 3 Not subject to leveling Total Level 1 Level 2 Level 3 Not subject to leveling Total Pension plan assets (a) Cash and cash equivalents $ 200 $ — $ — $ — $ 200 $ 260 $ 91 $ — $ — $ 351 Equities (b) 1,448 — — 782 2,230 2,699 — 2 1,273 3,974 Fixed income: U.S. Treasury and agencies 986 178 — — 1,164 1,002 176 — — 1,178 State and municipal debt — 44 — — 44 — 47 — — 47 Corporate debt (c) — 1,975 12 — 1,987 — 2,523 325 — 2,848 Other (b) — 63 — 744 807 43 161 12 301 517 Fixed income subtotal 986 2,260 12 744 4,002 1,045 2,907 337 301 4,590 Private equity — — — 1,169 1,169 — — — 1,124 1,124 Hedge funds — — — 760 760 — — — 774 774 Real estate — — — 821 821 — — — 760 760 Private credit — — — 658 658 — — 130 603 733 Pension plan assets subtotal 2,634 2,260 12 4,934 9,840 4,004 2,998 469 4,835 12,306 OPEB plan assets (a) Cash and cash equivalents 39 — — — 39 54 41 — — 95 Equities 305 1 — 273 579 387 2 — 324 713 Fixed income: U.S. Treasury and agencies 17 45 — — 62 14 44 — — 58 State and municipal debt — 8 — — 8 — 7 — — 7 Corporate debt (c) — 44 — — 44 — 74 — — 74 Other 161 5 — 187 353 223 4 — 136 363 Fixed income subtotal 178 102 — 187 467 237 129 — 136 502 Hedge funds — — — 120 120 — — — 175 175 Real estate — — — 106 106 — — — 86 86 Private credit — — — 39 39 — — — 84 84 OPEB plan assets subtotal 522 103 — 725 1,350 678 172 — 805 1,655 Total pension and OPEB plan assets (d) $ 3,156 $ 2,363 $ 12 $ 5,659 $ 11,190 $ 4,682 $ 3,170 $ 469 $ 5,640 $ 13,961 __________ (a) See Note 17—Fair Value of Financial Assets and Liabilities for a description of levels within the fair value hierarchy. (b) Includes derivative instruments of $11 million and $(2) million for the years ended December 31, 2022 and 2021, respectively, which have total notional amounts of $3,434 million and $3,481 million as of December 31, 2022 and 2021, respectively. The notional principal amounts for these instruments provide one measure of the transaction volume outstanding as of the fiscal years ended and do not represent the amount of the company’s exposure to credit or market loss. (c) Includes investments in equities sold short held in investment vehicles primarily to hedge the equity option component of its convertible debt. Pension equities sold short totaled $(44) million as of December 31, 2021. OPEB equities sold short totaled $(18) million as of December 31, 2021. There were no individually held investments sold short in 2022. (d) Excludes net liabilities of $318 million and $131 million as of December 31, 2022 and 2021, respectively, which include certain derivative assets that have notional amounts of $69 million and $127 million as of December 31, 2022 and 2021, respectively. These items are required to reconcile to the fair value of net plan assets and consist primarily of receivables or payables related to pending securities sales and purchases, interest and dividends receivable, and repurchase agreement obligations. The repurchase agreements generally have maturities ranging from 3-6 months. The following table presents the reconciliation of Level 3 assets and liabilities for Exelon measured at fair value for pension and OPEB plans for the years ended December 31, 2022 and 2021: Fixed Income Equities Private Credit Total Pension Assets Balance as of January 1, 2022 $ 337 $ 2 $ 130 $ 469 Actual return on plan assets: Relating to assets still held as of the (9) — (15) (24) Relating to assets sold during the period (19) — 13 (6) Purchases, sales and settlements: Purchases — — 7 7 Settlements (a) (1) — (52) (53) Transfers out of Level 3 (b) (296) (2) (83) (381) Balance as of December 31, 2022 $ 12 $ — $ — $ 12 Fixed Income Equities Private Credit Total Pension Assets Balance as of January 1, 2021 $ 348 $ 1 $ 136 $ 485 Actual return on plan assets: Relating to assets still held as of the reporting date (12) — 18 6 Purchases, sales and settlements: Purchases 10 — 5 15 Settlements (a) (13) — (29) (42) Transfers into Level 3 4 1 — 5 Balance as of December 31, 2021 $ 337 $ 2 $ 130 $ 469 __________ (a) Represents cash settlements only. (b) In 2022, transfers relate to changes in investment structure for certain investments due to the separation. Valuation Techniques Used to Determine Fair Value The techniques used to fair value the pension and OPEB assets invested in cash equivalents are the same as the valuation techniques used to determine the fair value of financial assets. See Cash Equivalents in Note 17 - Fair Value of Financial Assets and Liabilities for further information. Below outlines the techniques used to fair value the pension and OPEB assets invested in equities, fixed income, derivatives, private credit, private equity, and real estate investments. Equities. These investments consist of individually held equity securities, equity mutual funds, and equity commingled funds in domestic and foreign markets. With respect to individually held equity securities, the trustees obtain prices from pricing services, whose prices are generally obtained from direct feeds from market exchanges, which Exelon is able to independently corroborate. Equity securities held individually, including real estate investment trusts, rights, and warrants, are primarily traded on exchanges that contain only actively traded securities due to the volume trading requirements imposed by these exchanges. The equity securities that are held directly by the trust funds are valued based on quoted prices in active markets and categorized as Level 1. Certain equity securities have been categorized as Level 2 because they are based on evaluated prices that reflect observable market information, such as actual trade information or similar securities. Certain private placement equity securities are categorized as Level 3 because they are not publicly traded and are priced using significant unobservable inputs. Equity commingled funds and mutual funds are maintained by investment companies, and fund investments are held in accordance with a stated set of fund objectives. The values of some of these funds are publicly quoted. For mutual funds which are publicly quoted, the funds are valued based on quoted prices in active markets and have been categorized as Level 1. For equity commingled funds and mutual funds which are not publicly quoted, the fund administrators value the funds using the NAV per fund share, derived from the quoted prices in active markets on the underlying securities and are not classified within the fair value hierarchy. These investments can typically be redeemed monthly or more frequently, with 30 or less days of notice and without further restrictions. Fixed income. For fixed income securities, which consist primarily of corporate debt securities, U.S. government securities, foreign government securities, municipal bonds, asset and mortgage-backed securities, commingled funds, mutual funds, and derivative instruments, the trustees obtain multiple prices from pricing vendors whenever possible, which enables cross-provider validations in addition to checks for unusual daily movements. A primary price source is identified based on asset type, class, or issue for each security. With respect to individually held fixed income securities, the trustees monitor prices supplied by pricing services and may use a supplemental price source or change the primary price source of a given security if the portfolio managers challenge an assigned price and the trustees determine that another price source is considered to be preferable. Exelon has obtained an understanding of how these prices are derived, including the nature and observability of the inputs used in deriving such prices. Additionally, Exelon selectively corroborates the fair values of securities by comparison to other market-based price sources. Investments in U.S. Treasury securities have been categorized as Level 1 because they trade in highly-liquid and transparent markets. Certain private placement fixed income securities have been categorized as Level 3 because they are priced using certain significant unobservable inputs and are typically illiquid. The remaining fixed income securities, including certain other fixed income investments, are based on evaluated prices that reflect observable market information, such as actual trade information of similar securities, adjusted for observable differences and are categorized as Level 2. Other fixed income investments primarily consist of fixed income commingled funds and mutual funds, which are maintained by investment companies and hold fund investments in accordance with a stated set of fund objectives. The values of some of these funds are publicly quoted. For mutual funds which are publicly quoted, the funds are valued based on quote

Derivative Financial Instrument

Derivative Financial Instruments (All Registrants)	12 Months Ended
Derivative Financial Instruments (All Registrants)	Dec. 31, 2022
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments (All Registrants)	Derivative Financial Instruments (All Registrants) The Registrants use derivative instruments to manage commodity price risk and interest rate risk related to ongoing business operations. The Registrants do not execute derivatives for speculative or proprietary trading purposes. Authoritative guidance requires that derivative instruments be recognized as either assets or liabilities at fair value, with changes in fair value of the derivative recognized in earnings immediately. Other accounting treatments are available through special election and designation, provided they meet specific, restrictive criteria both at the time of designation and on an ongoing basis. These alternative permissible accounting treatments include NPNS, cash flow hedges, and fair value hedges. At ComEd, derivative economic hedges related to commodities are recorded at fair value and offset by a corresponding regulatory asset or liability. At Exelon, derivative economic hedges related to interest rates are recorded at fair value and offsets are recorded to Electric operating revenues or Interest expense based on the activity the transaction is economically hedging. For all NPNS derivative instruments, accounts receivable or accounts payable are recorded when derivatives settle and revenue or expense is recognized in earnings as the underlying physical commodity is sold or consumed. At Exelon, derivative hedges that qualify and are designated as cash flow hedges are recorded at fair value and offsets are recorded to AOCI. ComEd’s use of cash collateral is generally unrestricted unless ComEd is downgraded below investment grade. Cash collateral held by PECO, BGE, Pepco, DPL, and ACE must be deposited in an unaffiliated major U.S. commercial bank or foreign bank with a U.S. branch office that meets certain qualifications. Commodity Price Risk The Registrants employ established policies and procedures to manage their risks associated with market fluctuations in commodity prices by entering into physical and financial derivative contracts, which are either determined to be non-derivative or classified as economic hedges. The Utility Registrants procure electric and natural gas supply through a competitive procurement process approved by each of the respective state utility commissions. The Utility Registrants’ hedging programs are intended to reduce exposure to energy and natural gas price volatility and have no direct earnings impact as the costs are fully recovered from customers through regulatory-approved recovery mechanisms. The following table provides a summary of the Utility Registrants’ primary derivative hedging instruments, listed by commodity and accounting treatment. Registrant Commodity Accounting Treatment Hedging Instrument ComEd Electricity NPNS Fixed price contracts based on all requirements in the IPA procurement plans. Electricity Changes in fair value of economic hedge recorded to an offsetting regulatory asset or liability (a) 20-year floating-to-fixed energy swap contracts beginning June 2012 based on the renewable energy resource procurement requirements in the Illinois Settlement Legislation of approximately 1.3 million MWhs per year. PECO Electricity NPNS Fixed price contracts for default supply requirements through full requirements contracts. Gas NPNS Fixed price contracts to cover about 10% of planned natural gas purchases in support of projected firm sales. BGE Electricity NPNS Fixed price contracts for all SOS requirements through full requirements contracts. Gas NPNS Fixed price contracts for between 10-20% of forecasted system supply requirements for flowing (i.e., non-storage) gas for the November through March period. Pepco Electricity NPNS Fixed price contracts for all SOS requirements through full requirements contracts. DPL Electricity NPNS Fixed price contracts for all SOS requirements through full requirements contracts. Gas NPNS Fixed and index priced contracts through full requirements contracts. Gas Changes in fair value of economic hedge recorded to an offsetting regulatory asset or liability (b) Exchange traded future contracts for up to 50% of estimated monthly purchase requirements each month, including purchases for storage injections. ACE Electricity NPNS Fixed price contracts for all BGS requirements through full requirements contracts. _________ (a) See Note 3—Regulatory Matters for additional information. (b) The fair value of the DPL economic hedge is not material as of December 31, 2022 and 2021. The fair value of derivative economic hedges is presented in Other current assets and current and noncurrent Mark-to-market derivative liabilities in Exelon's and ComEd's Consolidated Balance Sheets. Interest Rate and Other Risk (Exelon) Exelon Corporate uses a combination of fixed-rate and variable-rate debt to manage interest rate exposure. Exelon Corporate may utilize interest rate derivatives to lock in rate levels in anticipation of future financings, which are typically designated as cash flow hedges. In addition, Exelon Corporate may also utilize interest rate swaps to manage interest rate exposure and manage potential fluctuations in Electric operating revenues at the corporate level in consolidation, which are directly correlated to yields on U.S. Treasury bonds under ComEd's distribution formula rate. These interest rate swaps are accounted for as economic hedges. A hypothetical 50 basis point change in the interest rates associated with Exelon's interest rate swaps as of December 31, 2022 would result in an immaterial impact to Exelon's Consolidated Net Income. Below is a summary of the interest rate hedge balances as of December 31, 2022. Exelon had no interest rate hedge activity in 2021. December 31, 2022 Derivatives Designated Economic Hedges Total Other deferred debits (noncurrent assets) $ 6 $ 5 $ 11 Total derivative assets 6 5 11 Mark-to-market derivative liabilities (current liabilities) — (3) (3) Mark-to-market derivative liabilities (noncurrent liabilities) (4) — (4) Total mark-to-market derivative liabilities (4) (3) (7) Total mark-to-market derivative net assets $ 2 $ 2 $ 4 Cash Flow Hedges (Interest Rate Risk) For derivative instruments that qualify and are designated as cash flow hedges, the changes in fair value each period are initially recorded in AOCI and reclassified into earnings when the underlying transaction affects earnings. In 2022, Exelon Corporate entered into $635 million notional of 5-year maturity floating-to-fixed swaps and $635 million notional of 10-year maturity floating-to-fixed swaps, for a total of $1,270 million as of December 31, 2022. Exelon had no swaps designated as cash flow hedges as of December 31, 2021. In January 2023, Exelon Corporate entered into $115 million notional of 5-year maturity floating-to-fixed swaps and $115 million notional of 10-year maturity floating-to-fixed swaps, for a total of $230 million designated as cash flow hedges. The total notional of the swaps issued as of the balance sheet date and subsequently are $1,500 million. The AOCI derivative gain is $2 million as of December 31, 2022. There were no amounts reclassified to Net Income in 2022. See Note 21 – Changes in Accumulated Other Comprehensive Income for additional information. Exelon had no swaps designated as cash flow hedges as of December 31, 2021. Economic Hedges (Interest Rate and Other Risk) Exelon Corporate executes derivative instruments to mitigate exposure to fluctuations in interest rates but for which the fair value or cash flow hedge elections were not made. For derivatives intended to serve as economic hedges, fair value is recorded on the balance sheet and changes in fair value each period are recognized in earnings or as a regulatory asset or liability, if regulatory requirements are met, each period. Exelon Corporate enters into floating-to-fixed interest rate cap swaps to manage a portion of interest rate exposure in connection with existing borrowings. In 2022, Exelon Corporate entered into $1,000 million notional of 18-month maturity floating-to-fixed interest rate cap swaps and $850 million notional of 6-month maturity floating-to-fixed interest rate cap swaps, for a total of $1,850 million notional of floating-to-fixed interest rate cap swaps as of December 31, 2022. Exelon had no swaps as of December 31, 2021. Additionally, to manage potential fluctuations in Electric operating revenues related to ComEd's distribution formula rate, Exelon Corporate enters into 30-year constant maturity treasury interest rate (Corporate 30-year treasury) swaps. As of December 31, 2022, Exelon Corporate entered into $500 million notional of calendar year 2023 Corporate 30-year treasury swaps. In January and February 2023, Exelon Corporate entered into a total of $1,500 million notional of calendar year 2023 Corporate 30-year treasury swaps. The total notional of the swaps issued as of the balance sheet date and subsequently are $2,000 million. For the year ended December 31, 2022, Exelon Corporate recognized the following net pre-tax mark-to-market losses which are also recognized in Net fair value changes related to derivatives in Exelon's Consolidated Statements of Cash Flows. Exelon had no swaps for the years ended December 31, 2021 and 2020 . Loss Income Statement Location 2022 Electric operating revenues $ 2 Interest expense 3 Total $ 5 Credit Risk The Registrants would be exposed to credit-related losses in the event of non-performance by counterparties on executed derivative instruments. The credit exposure of derivative contracts, before collateral, is represented by the fair value of contracts at the reporting date. The Utility Registrants have contracts to procure electric and natural gas supply that provide suppliers with a certain amount of unsecured credit. If the exposure on the supply contract exceeds the amount of unsecured credit, the suppliers may be required to post collateral. The net credit exposure is mitigated primarily by the ability to recover procurement costs through customer rates. As of December 31, 2022, the amount of cash collateral held with external counterparties by Exelon, ComEd, BGE, PHI, Pepco, DPL, and ACE was $297 million, $77 million, $23 million, $197 million, $26 million, $121 million, and $50 million, respectively, which is recorded in Other current liabilities in Exelon's, ComEd's, BGE's, PHI's, Pepco's, DPL's, and ACE's Consolidated Balance Sheets. The amount for PECO was not material as of December 31, 2022. As of December 31, 2021, the amounts for ComEd and DPL were $41 million and $43 million, respectively. The amounts for Exelon, PECO, BGE, PHI, Pepco, and ACE were not material as of December 31, 2021. The Utility Registrants’ electric supply procurement contracts do not contain provisions that would require them to post collateral. PECO’s, BGE’s, and DPL’s natural gas procurement contracts contain provisions that could require PECO, BGE, and DPL to post collateral in the form of cash or credit support, which vary by contract and counterparty, with thresholds contingent upon PECO’s, BGE's, and DPL’s credit rating. As of December 31, 2022, PECO, BGE, and DPL were not required to post collateral for any of these agreements. If PECO, BGE, or DPL lost their investment grade credit rating as of December 31, 2022, they could have been required to post collateral to their counterparties of $71 million, $119 million, and $15 million, respectively.

Debt and Credit Agreements (All

Debt and Credit Agreements (All Registrants)	12 Months Ended
Debt and Credit Agreements (All Registrants)	Dec. 31, 2022
Debt Disclosure [Abstract]
Debt and Credit Agreements (All Registrants)	Debt and Credit Agreements (All Registrants) Short-Term Borrowings Exelon Corporate, ComEd, and BGE meet their short-term liquidity requirements primarily through the issuance of commercial paper. PECO meets its short-term liquidity requirements primarily through the issuance of commercial paper and borrowings from the Exelon intercompany money pool. Pepco, DPL, and ACE meet their short-term liquidity requirements primarily through the issuance of commercial paper and borrowings from the PHI intercompany money pool. PHI Corporate meets its short-term liquidity requirements primarily through the issuance of short-term notes and borrowings from the Exelon intercompany money pool. The Registrants may use their respective credit facilities for general corporate purposes, including meeting short-term funding requirements and the issuance of letters of credit. Commercial Paper The following table reflects the Registrants' commercial paper programs supported by the revolving credit agreements and bilateral credit agreements as of December 31, 2022 and 2021: Credit Facility Size Outstanding Commercial Average Interest Rate on Commercial Paper Issuer 2022 (a) 2021 (a) 2022 2021 2022 2021 Exelon (b) $ 4,000 $ 3,700 $ 1,938 $ 599 4.77 % 0.35 % ComEd 1,000 1,000 427 — 4.71 % — % PECO 600 600 239 — 4.71 % — % BGE 600 600 409 130 4.81 % 0.37 % PHI (c) 900 900 414 469 4.78 % 0.35 % Pepco 300 (d) 300 299 175 4.79 % 0.33 % DPL 300 (d) 300 115 149 4.76 % 0.36 % ACE 300 (d) 300 — 145 — % 0.35 % __________ (a) Excludes credit facility agreements arranged at minority and community banks. See below for additional information. (b) Includes revolving credit agreements at Exelon Corporate with a maximum program size of $900 million and $600 million as of December 31, 2022 and December 31, 2021, respectively. Exelon Corporate had $449 million in outstanding commercial paper as of December 31, 2022 and no outstanding commercial paper as of December 31, 2021. (c) Represents the consolidated amounts of Pepco, DPL, and ACE. (d) The standard maximum program size for revolving credit facilities is $300 million each for Pepco, DPL and ACE based on the credit agreements in place. However, the facilities at Pepco, DPL, and ACE have the ability to flex to $500 million, $500 million, and $350 million, respectively. The borrowing capacity may be increased or decreased during the term of the facility, except that (i) the sum of the borrowing capacity must equal the total amount of the facility, and (ii) the aggregate amount of credit used at any given time by each of Pepco, DPL, or ACE may not exceed $900 million or the maximum amount of short-term debt the company is permitted to have outstanding by its regulatory authorities. The total number of the borrowing reallocations may not exceed eight per year during the term of the facility. As of December 23, 2022, this ability was utilized to increase Pepco's program size to $400 million. As a result, the program sizes for DPL and ACE were decreased to $250 million each, which prevents the aggregate amount of outstanding short-term debt from potentially exceeding the $900 million limit. In order to maintain their respective commercial paper programs in the amounts indicated above, each Registrant must have credit facilities in place, at least equal to the amount of its commercial paper program. A registrant does not issue commercial paper in an aggregate amount exceeding the then available capacity under its credit facility. As of December 31, 2022, the Registrants had the following aggregate bank commitments, credit facility borrowings, and available capacity under their respective credit facilities: Available Capacity as of December 31, 2022 Borrower (a) Facility Type Aggregate Bank (b) Facility Draws Outstanding Actual To Support Additional Commercial (c) Exelon (c) Syndicated Revolver $ 4,000 $ — $ 8 $ 3,992 $ 2,054 ComEd Syndicated Revolver 1,000 — 5 995 568 PECO Syndicated Revolver 600 — — 600 361 BGE Syndicated Revolver 600 — — 600 191 PHI (d) Syndicated Revolver 900 — — 900 486 Pepco Syndicated Revolver 300 — — 300 1 DPL Syndicated Revolver 300 — — 300 185 ACE Syndicated Revolver 300 — — 300 300 __________ (a) On February 1, 2022, Exelon Corporate and the Utility Registrants' respective syndicated revolving credit facilities were replaced with a new 5-year revolving credit facility. (b) Excludes credit facility agreements arranged at minority and community banks. See below for additional information. (c) Includes $900 million aggregate bank commitment related to Exelon Corporate. Exelon Corporate had $3 million outstanding letters of credit as of December 31, 2022. Exelon Corporate had $448 million in available capacity to support additional commercial paper as of December 31, 2022. (d) Represents the consolidated amounts of Pepco, DPL, and ACE. The following table reflects the Registrants' credit facility agreements arranged at minority and community banks as of December 31, 2022 and 2021. These are excluded from the Maximum Program Size and Aggregate Bank Commitment amounts within the two tables above and the facilities are solely used to issue letters of credit. Aggregate Bank Commitments Outstanding Letters of Credit Borrower 2022 (a) 2021 2022 2021 Exelon (b) $ 140 $ 98 $ 10 $ 8 ComEd 40 33 7 5 PECO 40 33 1 1 BGE 15 8 2 2 PHI (c) 45 24 — — Pepco 15 8 — — DPL 15 8 — — ACE 15 8 — — __________ (a) These facilities were entered into on October 7, 2022 and expire on October 6, 2023. (b) Represents the consolidated amounts of ComEd, PECO, BGE, Pepco, DPL, and ACE. (c) Represents the consolidated amounts of Pepco, DPL, and ACE. Revolving Credit Agreements On February 1, 2022, Exelon Corporate and the Utility Registrants each entered into a new 5-year revolving credit facility that replaced its existing syndicated revolving credit facility. The following table reflects the credit agreements: Borrower Aggregate Bank Commitment Interest Rate Exelon Corporate $ 900 SOFR plus 1.275 % ComEd 1,000 SOFR plus 1.000 % PECO 600 SOFR plus 0.900 % BGE 600 SOFR plus 0.900 % Pepco 300 SOFR plus 1.075 % DPL 300 SOFR plus 1.000 % ACE 300 SOFR plus 1.075 % Borrowings under Exelon’s, ComEd’s, PECO’s, BGE's, Pepco's, DPL's, and ACE's revolving credit agreements bear interest at a rate based upon either the prime rate or a SOFR-based rate, plus an adder based upon the particular Registrant’s credit rating. The adders for the prime based borrowings and SOFR-based borrowings are presented in the following table: Exelon (a) ComEd PECO BGE Pepco DPL ACE Prime based borrowings 0 - 27.5 — — — 7.5 — 7.5 SOFR-based borrowings 90.0 - 127.5 100.0 90.0 90.0 107.5 100.0 107.5 __________ (a) Includes interest rate adders at Exelon Corporate of 27.5 basis points and 127.5 basis points for prime and SOFR-based borrowings, respectively. If any registrant loses its investment grade rating, the maximum adders for prime rate borrowings and SOFR-based rate borrowings would be 65 basis points and 165 basis points, respectively. The credit agreements also require the borrower to pay a facility fee based upon the aggregate commitments. The fee varies depending upon the respective credit ratings of the borrower. Short-Term Loan Agreements On March 23, 2017, Exelon Corporate entered into a term loan agreement for $500 million. The loan agreement was renewed on March 14, 2022 and will expire on March 16, 2023. Pursuant to the loan agreement, loans made thereunder bear interest at a variable rate equal to SOFR plus 0.65% and all indebtedness thereunder is unsecured. The loan agreement is reflected in Exelon's Consolidated Balance Sheets within Short-term borrowings. On March 31, 2021, Exelon Corporate entered into a 364-day term loan agreement for $150 million with a variable interest rate of LIBOR plus 0.65% and an expiration date of March 30, 2022. Exelon Corporate repaid the term loan on March 30, 2022. In connection with the separation, on January 24, 2022, Exelon Corporate entered into a 364-day term loan agreement for $1.15 billion. The loan agreement had an expiration date of January 23, 2023. Pursuant to the loan agreement, loans made thereunder bore interest at a variable rate equal to SOFR plus 0.75% until July 23, 2022 and a rate of SOFR plus 0.975% thereafter. All indebtedness pursuant to the loan agreement was unsecured. On August 11, 2022, Exelon Corporate made a partial repayment of $575 million on the term loan. On October 11, 2022, the remaining $575 million outstanding balance was repaid in conjunction with the $500 million 18-month term loan that was entered into on October 7, 2022. On October 4, 2022, ComEd entered into a 364-day term loan agreement for $150 million with a variable rate equal to SOFR plus 0.75% and an expiration date of October 3, 2023. The proceeds from this loan were used to repay outstanding commercial paper obligations. The loan agreement is reflected in Exelon's and ComEd's Consolidated Balance Sheets within Short-term borrowings. The balance of the loan was repaid on January 13, 2023 in conjunction with the $400 million and $575 million First Mortgage Bond agreements that were entered into on January 3, 2023. Variable Rate Demand Bonds DPL has outstanding obligations in respect of Variable Rate Demand Bonds (VRDB). VRDBs are subject to repayment on the demand of the holders and, for this reason, are accounted for as short-term debt in accordance with GAAP. However, these bonds may be converted to a fixed-rate, fixed-term option to establish a maturity which corresponds to the date of final maturity of the bonds. On this basis, PHI views VRDBs as a source of long-term financing. As of both December 31, 2022 and December 31, 2021, $79 million in variable rate demand bonds issued by DPL were outstanding and are included in the Long-term debt due within one year in Exelon's, PHI's, and DPL's Consolidated Balance Sheets. Long-Term Debt The following tables present the outstanding long-term debt at the Registrants as of December 31, 2022 and 2021: Exelon Maturity December 31, Rates 2022 2021 Long-term debt First mortgage bonds (a)(b) 1.05 % - 7.90 % 2023 - 2052 $ 22,651 $ 20,751 Senior unsecured notes 2.75 % - 7.60 % 2025 - 2052 8,324 6,324 Unsecured notes 2.25 % - 6.35 % 2023 - 2052 4,250 4,000 Notes payable and other 1.64 % - 7.49 % 2025 - 2053 86 86 Junior subordinated notes 3.50 % 2022 — 1,150 Long-term software licensing agreement 2.30 % - 3.95 % 2024 - 2025 25 9 Unsecured tax-exempt bonds 4.00 % - 4.05 % 2024 33 143 Medium-terms notes (unsecured) 7.72 % 2027 10 10 Loan agreement 2.00 % 5.15 % 2023 - 2024 1,400 50 Total long-term debt 36,779 32,523 Unamortized debt discount and premium, net (74) (70) Unamortized debt issuance costs (257) (220) Fair value adjustment 626 669 Long-term debt due within one year (c) (1,802) (2,153) Long-term debt $ 35,272 $ 30,749 Long-term debt to financing trusts (d) Subordinated debentures to ComEd Financing III 6.35 % 2033 $ 206 $ 206 Subordinated debentures to PECO Trust III 7.38 % - 9.50 % 2028 81 81 Subordinated debentures to PECO Trust IV 5.75 % 2033 103 103 Total long-term debt to financing trusts $ 390 $ 390 __________ (a) Substantially all of ComEd’s assets other than expressly excepted property and substantially all of PECO’s, Pepco's, DPL's, and ACE's assets are subject to the liens of their respective mortgage indentures. (b) On January 3, 2023, ComEd entered into a purchase agreement of First Mortgage Bonds of $400 million and $575 million at 4.90% and 5.30% due on February 1, 2033 and February 1, 2053, respectively. The closing date of the issuance occurred on January 10, 2023. (c) In connection with the separation, Exelon Corporate entered into three 18-month term loan agreements. On January 21, 2022, two of the loan agreements were issued for $300 million each with an expiration date of July 21, 2023. On January 24, 2022, the third loan agreement was issued for $250 million with an expiration date of July 24, 2023. Pursuant to the loan agreement, loans made thereunder bear interest at a variable rate equal to SOFR plus 0.65%. (d) Amounts owed to these financing trusts are recorded as Long-term debt to financing trusts within Exelon’s Consolidated Balance Sheets. ComEd Maturity December 31, Rates 2022 2021 Long-term debt First mortgage bonds (a)(b) 2.20 % - 6.45 % 2024 - 2052 $ 10,629 $ 9,879 Other 7.49 % 2053 8 8 Total long-term debt 10,637 9,887 Unamortized debt discount and premium, net (27) (27) Unamortized debt issuance costs (92) (87) Long-term debt $ 10,518 $ 9,773 Long-term debt to financing trust (c) Subordinated debentures to ComEd Financing III 6.35 % 2033 $ 206 $ 206 Total long-term debt to financing trusts 206 206 Unamortized debt issuance costs (1) (1) Long-term debt to financing trusts $ 205 $ 205 __________ (a) Substantially all of ComEd’s assets, other than expressly excepted property, are subject to the lien of its mortgage indenture. (b) On January 3, 2023, ComEd entered into a purchase agreement of First Mortgage Bonds of $400 million and $575 million at 4.90% and 5.30% due on February 1, 2033 and February 1, 2053, respectively. The closing date of the issuance occurred on January 10, 2023. (c) Amount owed to this financing trust is recorded as Long-term debt to financing trust within ComEd’s Consolidated Balance Sheets. PECO Maturity December 31, Rates 2022 2021 Long-term debt First mortgage bonds (a) 2.80 % - 5.95 % 2025 - 2052 $ 4,625 $ 4,200 Loan agreement 2.00 % 2023 50 50 Total long-term debt 4,675 4,250 Unamortized debt discount and premium, net (24) (20) Unamortized debt issuance costs (39) (33) Long-term debt due within one year (50) (350) Long-term debt $ 4,562 $ 3,847 Long-term debt to financing trusts (b) Subordinated debentures to PECO Trust III 7.38 % - 9.50 % 2028 $ 81 $ 81 Subordinated debentures to PECO Trust IV 5.75 % 2033 103 103 Long-term debt to financing trusts $ 184 $ 184 __________ (a) Substantially all of PECO’s assets are subject to the lien of its mortgage indenture. (b) Amounts owed to this financing trust are recorded as Long-term debt to financing trusts within PECO’s Consolidated Balance Sheets. BGE Maturity December 31, Rates 2022 2021 Long-term debt Unsecured notes 2.25 % - 6.35 % 2023 - 2052 $ 4,250 $ 4,000 Total long-term debt 4,250 4,000 Unamortized debt discount and premium, net (13) (12) Unamortized debt issuance costs (30) (27) Long-term debt due within one year (300) (250) Long-term debt $ 3,907 $ 3,711 PHI Maturity December 31, Rates 2022 2021 Long-term debt First mortgage bonds (a) 1.05 % - 7.90 % 2023 - 2052 $ 7,397 $ 6,672 Senior unsecured notes 7.45 % 2032 185 185 Unsecured tax-exempt bonds 4.00 % - 4.05 % 2024 33 143 Medium-terms notes (unsecured) 7.72 % 2027 10 10 Finance leases 5.59 % 2025 - 2030 76 74 Other (b) 7.28 % - 7.49 % 2022 — — Total long-term debt 7,701 7,084 Unamortized debt discount and premium, net 4 4 Unamortized debt issuance costs (47) (36) Fair value adjustment 462 495 Long-term debt due within one year (591) (399) Long-term debt $ 7,529 $ 7,148 _________ (a) Substantially all of Pepco's, DPL's, and ACE's assets are subject to the liens of their respective mortgage indentures. (b) The amount in the Other category was zero and less than $1 million as of December 31, 2022 and December 31, 2021, respectively. Pepco Maturity December 31, Rates 2022 2021 Long-term debt First mortgage bonds (a) 2.32 % - 7.90 % 2024 - 2052 $ 3,775 $ 3,350 Unsecured tax-exempt bonds 1.70 % 2022 — 110 Finance leases 5.59 % 2025 - 2029 25 26 Other (b) 7.28 % - 7.49 % 2022 — — Total long-term debt 3,800 3,486 Unamortized debt discount and premium, net 2 2 Unamortized debt issuance costs (51) (43) Long-term debt due within one year (4) (313) Long-term debt $ 3,747 $ 3,132 ________ (a) Substantially all of Pepco's assets are subject to the lien of its mortgage indenture. (b) The amount in the Other category was zero and less than $1 million as of December 31, 2022 and December 31, 2021, respectively. DPL Maturity December 31, Rates 2022 2021 Long-term debt First mortgage bonds (a) 1.05 % - 4.27 % 2023 - 2052 $ 1,874 $ 1,749 Unsecured tax-exempt bonds 4.00 % - 4.05 % 2024 33 33 Medium-terms notes (unsecured) 7.72 % 2027 10 10 Finance leases 5.39 % 2025 - 2030 32 29 Total long-term debt 1,949 1,821 Unamortized debt discount and premium, net (b) — — Unamortized debt issuance costs (11) (11) Long-term debt due within one year (584) (83) Long-term debt $ 1,354 $ 1,727 __________ (a) Substantially all of DPL's assets are subject to the lien of its mortgage indenture. (b) The amount in the Unamortized debt discount and premium, net category was less than $1 million as of December 31, 2022 and 2021. ACE Maturity December 31, Rates 2022 2021 Long-term debt First mortgage bonds (a) 2.25 % - 5.80 % 2024 - 2052 $ 1,748 $ 1,573 Finance leases 5.59 % 2025 - 2030 19 19 Total long-term debt 1,767 1,592 Unamortized debt discount and premium, net (1) (1) Unamortized debt issuance costs (9) (9) Long-term debt due within one year (3) (3) Long-term debt $ 1,754 $ 1,579 __________ (a) Substantially all of ACE's assets are subject to the lien of its mortgage indenture. Long-term debt maturities at the Registrants in the periods 2023 through 2027 and thereafter are as follows: Year Exelon ComEd PECO BGE PHI Pepco DPL ACE 2023 $ 1,802 $ — $ 50 $ 300 $ 591 $ 4 $ 584 $ 3 2024 1,317 250 — — 564 405 6 153 2025 1,414 — 350 — 242 5 84 153 2026 1,613 500 — 350 13 4 6 3 2027 1,021 350 — — 21 3 15 3 Thereafter 30,002 (a) 9,743 (b) 4,459 (c) 3,600 6,270 3,379 1,254 1,452 Total $ 37,169 $ 10,843 $ 4,859 $ 4,250 $ 7,701 $ 3,800 $ 1,949 $ 1,767 __________ (a) Includes $390 million due to ComEd and PECO financing trusts. (b) Includes $206 million due to ComEd financing trust. (c) Includes $184 million due to PECO financing trusts. Long-Term Debt to Affiliates In connection with the debt obligations assumed by Exelon as part of the Constellation merger, Exelon and subsidiaries of Generation (former Constellation subsidiaries) entered into intercompany loan agreements that mirror the terms and amounts of the third-party debt obligations of Exelon, resulting in intercompany notes receivable at Exelon Corporate from Generation. As of December 31, 2021, Exelon Corporate had $319 million recorded to intercompany notes receivable from Generation. In connection with the separation, on January 31, 2022, Exelon Corporate received cash from Generation of $258 million to settle the intercompany loan. Debt Covenants As of December 31, 2022, the Registrants are in compliance with debt covenants.

Fair Value of Financial Assets

Fair Value of Financial Assets and Liabilities (All Registrants)	12 Months Ended
	Dec. 31, 2022
Fair Value Disclosures [Abstract]
Fair Value of Financial Assets and Liabilities (All Registrants)	Fair Value of Financial Assets and Liabilities (All Registrants) Exelon measures and classifies fair value measurements in accordance with the hierarchy as defined by GAAP. The hierarchy prioritizes the inputs to valuation techniques used to measure fair value into three levels as follows: • Level 1 — quoted prices (unadjusted) in active markets for identical assets or liabilities that the Registrants have the ability to liquidate as of the reporting date. • Level 2 — inputs other than quoted prices included within Level 1 that are directly observable for the asset or liability or indirectly observable through corroboration with observable market data. • Level 3 — unobservable inputs, such as internally developed pricing models or third-party valuations for the asset or liability due to little or no market activity for the asset or liability. Fair Value of Financial Liabilities Recorded at Amortized Cost The following tables present the carrying amounts and fair values of the Registrants’ short-term liabilities, long-term debt, and trust preferred securities (long-term debt to financing trusts or junior subordinated debentures) as of December 31, 2022 and 2021. The Registrants have no financial liabilities classified as Level 1 or measured using the NAV practical expedient. The carrying amounts of the Registrants’ short-term liabilities as presented in their Consolidated Balance Sheets are representative of their fair value (Level 2) because of the short-term nature of these instruments. December 31, 2022 December 31, 2021 Carrying Amount Fair Value Carrying Amount Fair Value Level 2 Level 3 Total Level 2 Level 3 Total Long-Term Debt, including amounts due within one year (a) Exelon $ 37,074 $ 29,902 $ 2,327 $ 32,229 $ 32,902 $ 34,897 $ 2,217 $ 37,114 ComEd 10,518 9,006 — 9,006 9,773 11,305 — 11,305 PECO 4,612 3,864 50 3,914 4,197 4,740 50 4,790 BGE 4,207 3,613 — 3,613 3,961 4,406 — 4,406 PHI 8,120 4,507 2,277 6,784 7,547 5,970 2,167 8,137 Pepco 3,751 2,229 1,205 3,434 3,445 3,201 975 4,176 DPL 1,938 1,164 458 1,622 1,810 1,426 552 1,978 ACE 1,757 909 614 1,523 1,582 1,091 641 1,732 Long-Term Debt to Financing Trusts Exelon $ 390 $ — $ 384 $ 384 $ 390 $ — $ 470 $ 470 ComEd 205 — 204 204 205 — 248 248 PECO 184 — 180 180 184 — 222 222 __________ (a) Includes unamortized debt issuance costs, unamortized debt discount and premium, net, purchase accounting fair value adjustments, and finance lease liabilities which are not fair valued. Refer to Note 16 — Debt and Credit Agreements for unamortized debt issuance costs, unamortized debt discount and premium, net, and purchase accounting fair value adjustments and Note 10 — Leases for finance lease liabilities . Exelon uses the following methods and assumptions to estimate fair value of financial liabilities recorded at carrying cost: Type Level Registrants Valuation Long-Term Debt, including amounts due within one year Taxable Debt Securities 2 All The fair value is determined by a valuation model that is based on a conventional discounted cash flow methodology and utilizes assumptions of current market pricing curves. Exelon obtains credit spreads based on trades of existing Exelon debt securities as well as other issuers in the utility sector with similar credit ratings. The yields are then converted into discount rates of various tenors that are used for discounting the respective cash flows of the same tenor for each bond or note. Variable Rate Financing Debt 2 Exelon, DPL Debt rates are reset on a regular basis and the carrying value approximates fair value. Taxable Private Placement Debt Securities 3 Exelon, Pepco, DPL, ACE Rates are obtained similar to the process for taxable debt securities. Due to low trading volume and qualitative factors such as market conditions, low volume of investors, and investor demand, these debt securities are Level 3. Non-Government Backed Fixed Rate Nonrecourse Debt 3 Exelon, Pepco Fair value is based on market and quoted prices for its own and other nonrecourse debt with similar risk profiles. Given the low trading volume in the nonrecourse debt market, the price quotes used to determine fair value will reflect certain qualitative factors, such as market conditions, investor demand, new developments that might significantly impact the project cash flows or off-taker credit, and other circumstances related to the project. Long-Term Debt to Financing Trusts Long Term Debt to Financing Trusts 3 Exelon, ComEd, PECO Fair value is based on publicly traded securities issued by the financing trusts. Due to low trading volume of these securities and qualitative factors, such as market conditions, investor demand, and circumstances related to each issue, this debt is classified as Level 3. Recurring Fair Value Measurements The following tables present assets and liabilities measured and recorded at fair value in the Registrants' Consolidated Balance Sheets on a recurring basis and their level within the fair value hierarchy as of December 31, 2022 and 2021. The Registrants have no financial assets or liabilities measured using the NAV practical expedient: Exelon As of December 31, 2022 As of December 31, 2021 Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Assets Cash equivalents (a) $ 664 $ — $ — $ 664 $ 524 $ — $ — $ 524 Rabbi trust investments Cash equivalents 62 — — 62 60 — — 60 Mutual funds 49 — — 49 60 — — 60 Fixed income — 7 — 7 — 10 — 10 Life insurance contracts — 58 40 98 — 61 37 98 Rabbi trust investments subtotal 111 65 40 216 120 71 37 228 Interest rate derivative assets Derivatives designated as hedging instruments — 6 — 6 — — — — Economic hedges — 5 — 5 — — — — Interest rate derivative assets subtotal — 11 — 11 — — — — Total assets 775 76 40 891 644 71 37 752 Liabilities Mark-to-market derivative liabilities — — (84) (84) — — (219) (219) Interest rate derivative liabilities Derivatives designated as hedging instruments — (4) — (4) — — — — Economic hedges — (3) — (3) — — — — Interest rate derivative liabilities subtotal — (7) — (7) — — — — Deferred compensation obligation — (75) — (75) — (131) — (131) Total liabilities — (82) (84) (166) — (131) (219) (350) Total net assets (liabilities) $ 775 $ (6) $ (44) $ 725 $ 644 $ (60) $ (182) $ 402 __________ (a) Excludes cash of $345 million and $464 million as of December 31, 2022 and 2021, respectively, and restricted cash of $81 million and $49 million as of December 31, 2022 and 2021, respectively, and includes long-term restricted cash of $117 million and $44 million as of December 31, 2022 and 2021, respectively, which is reported in Other deferred debits in the Consolidated Balance Sheets. ComEd, PECO, and BGE ComEd PECO BGE As of December 31, 2022 Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Assets Cash equivalents (a) $ 392 $ — $ — $ 392 $ 10 $ — $ — $ 10 $ 23 $ — $ — $ 23 Rabbi trust investments Mutual funds — — — — 7 — — 7 7 — — 7 Life insurance contracts — — — — — 15 — 15 — — — — Rabbi trust investments subtotal — — — — 7 15 — 22 7 — — 7 Total assets 392 — — 392 17 15 — 32 30 — — 30 Liabilities Mark-to-market derivative liabilities (b) — — (84) (84) — — — — — — — — Deferred compensation obligation — (8) — (8) — (7) — (7) — (4) — (4) Total liabilities — (8) (84) (92) — (7) — (7) — (4) — (4) Total net assets (liabilities) $ 392 $ (8) $ (84) $ 300 $ 17 $ 8 $ — $ 25 $ 30 $ (4) $ — $ 26 ComEd PECO BGE As of December 31, 2021 Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Assets Cash equivalents (a) $ 237 $ — $ — $ 237 $ 9 $ — $ — $ 9 $ — $ — $ — $ — Rabbi trust investments Mutual funds — — — — 11 — — 11 14 — — 14 Life insurance contracts — — — — — 16 — 16 — — — — Rabbi trust investments subtotal — — — — 11 16 — 27 14 — — 14 Total assets 237 — — 237 20 16 — 36 14 — — 14 Liabilities Mark-to-market derivative liabilities (b) — — (219) (219) — — — — — — — — Deferred compensation obligation — (10) — (10) — (9) — (9) — (7) — (7) Total liabilities — (10) (219) (229) — (9) — (9) — (7) — (7) Total net assets (liabilities) $ 237 $ (10) $ (219) $ 8 $ 20 $ 7 $ — $ 27 $ 14 $ (7) $ — $ 7 __________ (a) ComEd excludes cash of $42 million and $105 million as of December 31, 2022 and 2021, respectively, and restricted cash of $77 million and $42 million as of December 31, 2022 and 2021, respectively, and includes long-term restricted cash of $117 million and $43 million as of December 31, 2022 and 2021, respectively, which is reported in Other deferred debits in the Consolidated Balance Sheets. PECO excludes cash of $58 million and $35 million as of December 31, 2022 and 2021, respectively. BGE excludes cash of $43 million and $51 million as of December 31, 2022 and 2021, respectively, and restricted cash of $1 million and $4 million as of December 31, 2022 and 2021, respectively. (b) The Level 3 balance consists of the current and noncurrent liability of $5 million and $79 million, respectively, as of December 31, 2022, and $18 million and $201 million, respectively, as of December 31, 2021 related to floating-to-fixed energy swap contracts with unaffiliated suppliers. PHI, Pepco, DPL, and ACE As of December 31, 2022 As of December 31, 2021 PHI Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Assets Cash equivalents (a) $ 205 $ — $ — $ 205 $ 110 $ — $ — $ 110 Rabbi trust investments Cash equivalents 59 — — 59 59 — — 59 Mutual funds 11 — — 11 14 — — 14 Fixed income — 7 — 7 — 10 — 10 Life insurance contracts — 22 39 61 — 27 35 62 Rabbi trust investments subtotal 70 29 39 138 73 37 35 145 Total assets 275 29 39 343 183 37 35 255 Liabilities Deferred compensation obligation — (14) — (14) — (18) — (18) Total liabilities — (14) — (14) — (18) — (18) Total net assets $ 275 $ 15 $ 39 $ 329 $ 183 $ 19 $ 35 $ 237 Pepco DPL ACE As of December 31, 2022 Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Assets Cash equivalents (a) $ 51 $ — $ — $ 51 $ 121 $ — $ — $ 121 $ 1 $ — $ — $ 1 Rabbi trust investments Cash equivalents 59 — — 59 — — — — — — — — Life insurance contracts — 22 38 60 — — — — — — — — Rabbi trust investments subtotal 59 22 38 119 — — — — — — — — Total assets 110 22 38 170 121 — — 121 1 — — 1 Liabilities Deferred compensation obligation — (1) — (1) — — — — — — — — Total liabilities — (1) — (1) — — — — — — — — Total net assets $ 110 $ 21 $ 38 $ 169 $ 121 $ — $ — $ 121 $ 1 $ — $ — $ 1 Pepco DPL ACE As of December 31, 2021 Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Assets Cash equivalents (a) $ 31 $ — $ — $ 31 $ 43 $ — $ — $ 43 $ — $ — $ — $ — Rabbi trust investments Cash equivalents 58 — — 58 — — — — — — — — Life insurance contracts — 27 35 62 — — — — — — — — Rabbi trust investments subtotal 58 27 35 120 — — — — — — — — Total assets 89 27 35 151 43 — — 43 — — — — Liabilities Deferred compensation obligation — (2) — (2) — — — — — — — — Total liabilities — (2) — (2) — — — — — — — — Total net assets $ 89 $ 25 $ 35 $ 149 $ 43 $ — $ — $ 43 $ — $ — $ — $ — __________ (a) PHI excludes cash of $165 million and $100 million as of December 31, 2022 and 2021, respectively, and restricted cash of $3 million and $3 million as of December 31, 2022 and 2021, respectively. Pepco excludes cash of $45 million and $34 million as of December 31, 2022 and 2021, respectively, and restricted cash of $3 million and $3 million as of December 31, 2022 and 2021, respectively. DPL excludes cash of $31 million and $28 million as of December 31, 2022 and 2021, respectively. ACE excludes cash of $71 million and $29 million as of December 31, 2022 and 2021, respectively. Reconciliation of Level 3 Assets and Liabilities The following tables present the fair value reconciliation of Level 3 assets and liabilities measured at fair value on a recurring basis during the years ended December 31, 2022 and 2021: Exelon ComEd PHI and Pepco For the year ended December 31, 2022 Total Mark-to-Market Life Insurance Contracts Balance as of December 31, 2021 $ (182) $ (219) $ 35 Total realized / unrealized gains (losses) Included in net income (a) 5 — 5 Included in regulatory assets/liabilities 135 135 (b) — Purchases, sales, and settlements Settlements — — — Transfers out of Level 3 (2) — — Balance as of December 31, 2022 $ (44) $ (84) (c) $ 40 The amount of total gains included in income attributed to the change in unrealized gains (losses) related to assets and liabilities as of December 31, 2022 5 $ — $ 5 Exelon ComEd PHI and Pepco For the year ended December 31, 2021 Total Mark-to-Market Life Insurance Contracts Balance as of December 31, 2020 $ (267) $ (301) $ 34 Total realized / unrealized gains (losses) Included in net income (a) 3 — 3 Included in regulatory assets/liabilities 82 82 (b) — Purchases, sales, and settlements Settlements (2) — (2) Transfers into Level 3 2 — — Balance as of December 31, 2021 $ (182) $ (219) $ 35 The amount of total gains included in income attributed to the change in unrealized gains (losses) related to assets and liabilities as of December 31, 2021 $ 3 $ — $ 3 __________ (a) Classified in Operating and maintenance expense in the Consolidated Statements of Operations and Comprehensive Income. (b) Includes $136 million of increases in fair value and a decrease for realized losses due to settlements of $1 million recorded in purchased power expense associated with floating-to-fixed energy swap contracts with unaffiliated suppliers for the year ended December 31, 2022. Includes $62 million of increases in fair value and an increase for realized losses due to settlements of $20 million recorded in purchased power expense associated with floating-to-fixed energy swap contracts with unaffiliated suppliers for the year ended December 31, 2021. (c) The balance of the current and noncurrent asset was effectively zero as of December 31, 2022. The balance consists of a current and noncurrent liability of $5 million and $79 million, respectively, as of December 31, 2022. Valuation Techniques Used to Determine Fair Value Cash Equivalents (All Registrants). Investments with original maturities of three months or less when purchased, including mutual and money market funds, are considered cash equivalents. The fair values are based on observable market prices and, therefore, are included in the recurring fair value measurements hierarchy as Level 1. Rabbi Trust Investments (Exelon, PECO, BGE, PHI, Pepco, DPL, and ACE). The Rabbi trusts were established to hold assets related to deferred compensation plans existing for certain active and retired members of Exelon’s executive management and directors. The Rabbi trusts' assets are included in investments in the Registrants’ Consolidated Balance Sheets and consist primarily of money market funds, mutual funds, fixed income securities, and life insurance policies. Money market funds and mutual funds are publicly quoted and have been categorized as Level 1 given the clear observability of the prices. The fair values of fixed income securities are based on evaluated prices that reflect observable market information, such as actual trade information or similar securities, adjusted for observable differences and are categorized in Level 2. The life insurance policies are valued using the cash surrender value of the policies, net of loans against those policies, which is provided by a third-party. Certain life insurance policies, which consist primarily of mutual funds that are priced based on observable market data, have been categorized as Level 2 because the life insurance policies can be liquidated at the reporting date for the value of the underlying assets. Life insurance policies that are valued using unobservable inputs have been categorized as Level 3, where the fair value is determined based on the cash surrender value of the policy, which contains unobservable inputs and assumptions. Because Exelon relies on its third-party insurance provider to develop the inputs without adjustment for the valuations of its Level 3 investments, quantitative information about significant unobservable inputs used in valuing these investments is not reasonably available to Exelon. Therefore, Exelon has not disclosed such inputs. Interest Rate Derivatives (Exelon) Exelon may utilize fixed-to-floating or floating-to-fixed interest rate swaps as a means to manage interest rate risk. These interest rate swaps are typically accounted for as economic hedges. In addition, Exelon may utilize interest rate derivatives to lock in interest rate levels in anticipation of future financings. These interest rate derivatives are typically designated as cash flow hedges. Exelon determines the current fair value by calculating the net present value of expected payments and receipts under the swap agreement, based on and discounted by the market's expectation of future interest rates. Additional inputs to the net present value calculation may include the contract terms, counterparty credit risk and other market parameters. As these inputs are based on observable data and valuations of similar instruments, the interest rate swaps are categorized as Level 2 in the fair value hierarchy. See Note 15 — Derivative Financial Instruments for additional information on mark-to-market derivatives. Deferred Compensation Obligations (All Registrants). The Registrants’ deferred compensation plans allow participants to defer certain cash compensation into a notional investment account. The Registrants include such plans in other current and noncurrent liabilities in their Consolidated Balance Sheets. The value of the Registrants’ deferred compensation obligations is based on the market value of the participants’ notional investment accounts. The underlying notional investments are comprised primarily of equities, mutual funds, commingled funds, and fixed income securities which are based on directly and indirectly observable market prices. Since the deferred compensation obligations themselves are not exchanged in an active market, they are categorized as Level 2 in the fair value hierarchy. The value of certain employment agreement obligations (which are included with the Deferred Compensation Obligation in the tables above) are based on a known and certain stream of payments to be made over time and are categorized as Level 2 within the fair value hierarchy. Mark-to-Market Derivatives (Exelon and ComEd). On December 17, 2010, ComEd entered into several 20-year floating to fixed energy swap contracts with unaffiliated suppliers for the procurement of long-term renewable energy and associated RECs. Delivery under the contracts began in June 2012. The fair value of these swaps has been designated as a Level 3 valuation due to the long tenure of the positions and the internal modeling assumptions. The modeling assumptions include using forward power prices. See Note 15 — Derivative Financial Instruments for additional information on mark-to-market derivatives. The following table discloses the significant unobservable inputs to the forward curve used to value mark-to-market derivatives: Type of trade Fair Value as of December 31, 2022 Fair Value as of December 31, 2021 Valuation Unobservable 2022 Range & Arithmetic Average 2021 Range & Arithmetic Average Mark-to-market derivatives $ (84) $ (219) Discounted Cash Flow Forward power price (a) $ 34.78 - $ 75.71 $ 48.44 $ 28.65 - $ 47.10 $ 33.96 __________ (a) An increase to the forward power price would increase the fair value.

Commitments and Contingencies (

Commitments and Contingencies (All Registrants)	12 Months Ended
Commitments and Contingencies (All Registrants)	Dec. 31, 2022
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies (All Registrants)	Commitments and Contingencies (All Registrants) Commitments PHI Merger Commitments (Exelon, PHI, Pepco, DPL, and ACE). Approval of the PHI Merger in Delaware, New Jersey, Maryland, and the District of Columbia was conditioned upon Exelon and PHI agreeing to certain commitments. The following amounts represent total commitment costs that have been recorded since the acquisition date and the total remaining obligations for Exelon, PHI, Pepco, DPL, and ACE as of December 31, 2022: Description Exelon PHI Pepco DPL ACE Total commitments $ 513 $ 320 $ 120 $ 89 $ 111 Remaining commitments (a) 52 45 39 4 2 __________ (a) Remaining commitments extend through 2026 and include rate credits, energy efficiency programs, and delivery system modernization. In addition, DPL has committed to conducting three RFPs to procure up to a total of 120 MWs of wind RECs for the purpose of meeting Delaware's renewable portfolio standards. DPL has completed the three required wind REC RFPs. The first 40 MW wind REC tranche was conducted in 2017 and did not result in a purchase agreement. The second 40 MW wind REC tranche was conducted in 2018 and resulted in a proposed REC purchase agreement that was approved by the DEPSC in 2019. The third and final 40 MW wind REC tranche was conducted in 2022 and did not result in a purchase agreement. On December 14, 2022, the DEPSC issued an order recognizing DPL’s completion of all obligations under this merger commitment. Commercial Commitments (All Registrants). The Registrants' commercial commitments as of December 31, 2022, representing commitments potentially triggered by future events were as follows: Expiration within Exelon Total 2023 2024 2025 2026 2027 2028 and beyond Letters of credit $ 19 $ 17 $ 2 $ — $ — $ — $ — Surety bonds (a) 205 203 2 — — — — Financing trust guarantees 378 — — — — — 378 Guaranteed lease residual values (b) 29 — 6 6 5 4 8 Total commercial commitments $ 631 $ 220 $ 10 $ 6 $ 5 $ 4 $ 386 ComEd Letters of credit $ 12 $ 10 $ 2 $ — $ — $ — $ — Surety bonds (a) 46 44 2 — — — — Financing trust guarantees 200 — — — — — 200 Total commercial commitments $ 258 $ 54 $ 4 $ — $ — $ — $ 200 PECO Letters of credit $ 1 $ 1 $ — $ — $ — $ — $ — Surety bonds (a) 2 2 — — — — — Financing trust guarantees 178 — — — — — 178 Total commercial commitments $ 181 $ 3 $ — $ — $ — $ — $ 178 BGE Letters of credit $ 2 $ 2 $ — $ — $ — $ — $ — Surety bonds (a) 2 2 — — — — — Total commercial commitments $ 4 $ 4 $ — $ — $ — $ — $ — PHI Surety bonds (a) $ 96 $ 96 $ — $ — $ — $ — $ — Guaranteed lease residual values (b) 29 — 6 6 5 4 8 Total commercial commitments $ 125 $ 96 $ 6 $ 6 $ 5 $ 4 $ 8 Pepco Surety bonds (a) $ 84 $ 84 $ — $ — $ — $ — $ — Guaranteed lease residual values (b) 10 — 2 2 2 1 3 Total commercial commitments $ 94 $ 84 $ 2 $ 2 $ 2 $ 1 $ 3 DPL Surety bonds (a) $ 7 $ 7 $ — $ — $ — $ — $ — Guaranteed lease residual values (b) 12 — 3 2 2 2 3 Total commercial commitments $ 19 $ 7 $ 3 $ 2 $ 2 $ 2 $ 3 ACE Surety bonds (a) $ 5 $ 5 $ — $ — $ — $ — $ — Guaranteed lease residual values (b) 7 — 1 2 1 1 2 Total commercial commitments $ 12 $ 5 $ 1 $ 2 $ 1 $ 1 $ 2 __________ (a) Surety bonds—Guarantees issued related to contract and commercial agreements, excluding bid bonds. (b) Represents the maximum potential obligation in the event that the fair value of certain leased equipment and fleet vehicles is zero at the end of the maximum lease term. The lease term associated with these assets ranges from 1 to 8 years. The maximum potential obligation at the end of the minimum lease term would be $68 million guaranteed by Exelon and PHI, of which $22 million , $28 million, and $18 million is guaranteed by Pepco, DPL, and ACE, respectively. Historically, payments under the guarantees have not been made and PHI believes the likelihood of payments being required under the guarantees is remote. Environmental Remediation Matters General (All Registrants). The Registrants’ operations have in the past, and may in the future, require substantial expenditures to comply with environmental laws. Additionally, under federal and state environmental laws, the Registrants are generally liable for the costs of remediating environmental contamination of property now or formerly owned by them and of property contaminated by hazardous substances generated by them. The Registrants own or lease a number of real estate parcels, including parcels on which their operations or the operations of others may have resulted in contamination by substances that are considered hazardous under environmental laws. In addition, the Registrants are currently involved in a number of proceedings relating to sites where hazardous substances have been deposited and may be subject to additional proceedings in the future. Unless otherwise disclosed, the Registrants cannot reasonably estimate whether they will incur significant liabilities for additional investigation and remediation costs at these or additional sites identified by the Registrants, environmental agencies or others, or whether such costs will be recoverable from third parties, including customers. Additional costs could have a material, unfavorable impact on the Registrants' financial statements. MGP Sites (All Registrants). ComEd, PECO, BGE, and DPL have identified sites where former MGP or gas purification activities have or may have resulted in actual site contamination. For some sites, there are additional PRPs that may share responsibility for the ultimate remediation of each location. • ComEd has 20 sites that are currently under some degree of active study and/or remediation. ComEd expects the majority of the remediation at these sites to continue through at least 2031. • PECO has 6 sites that are currently under some degree of active study and/or remediation. PECO expects the majority of the remediation at these sites to continue through at least 2024. • BGE has 4 sites that currently require some level of remediation and/or ongoing activity. BGE expects the majority of the remediation at these sites to continue through at least 2025. • DPL has 1 site that is currently under study and the required cost at the site is not expected to be material. The historical nature of the MGP and gas purification sites and the fact that many of the sites have been buried and built over, impacts the ability to determine a precise estimate of the ultimate costs prior to initial sampling and determination of the exact scope and method of remedial activity. Management determines its best estimate of remediation costs using all available information at the time of each study, including probabilistic and deterministic modeling for ComEd and PECO, and the remediation standards currently required by the applicable state environmental agency. Prior to completion of any significant clean up, each site remediation plan is approved by the appropriate state environmental agency. ComEd, pursuant to an ICC order, and PECO, pursuant to a PAPUC order, are currently recovering environmental remediation costs of former MGP facility sites through customer rates. While BGE and DPL do not have riders for MGP clean-up costs, they have historically received recovery of actual clean-up costs in distribution rates. In 2022, ComEd and PECO completed an annual study of their future estimated MGP remediation requirements. The study resulted in a $60 million increase to the environmental liability and related regulatory asset for ComEd. The increase was primarily due to increased costs due to inflation and changes in remediation plans. The study did not result in a material change to the environmental liability for PECO. As of December 31, 2022 and 2021, the Registrants had accrued the following undiscounted amounts for environmental liabilities in Accrued expenses, Other current liabilities, and Other deferred credits and other liabilities in their respective Consolidated Balance Sheets: December 31, 2022 December 31, 2021 Total environmental Portion of total related to Total environmental Portion of total related to Exelon $ 409 $ 355 $ 352 $ 303 ComEd 325 324 279 279 PECO 25 23 22 20 BGE 9 8 6 4 PHI 46 — 42 — Pepco 44 — 40 — DPL 1 — 1 — ACE 1 — 1 — Benning Road Site (Exelon, PHI, and Pepco). In September 2010, PHI received a letter from EPA identifying the Benning Road site as one of six land-based sites potentially contributing to contamination of the lower Anacostia River. A portion of the site, which is owned by Pepco, was formerly the location of an electric generating facility owned by Pepco subsidiary, Pepco Energy Services (PES), which became a part of Generation, following the 2016 merger between PHI and Exelon. This generating facility was deactivated in June 2012. The remaining portion of the site consists of a Pepco transmission and distribution service center that remains in operation. In December 2011, the U.S. District Court for the District of Columbia approved a Consent Decree entered into by Pepco and Pepco Energy Services (hereinafter "Pepco Entities") with the DOEE, which requires the Pepco Entities to conduct a Remedial Investigation and Feasibility Study (RI/FS) for the Benning Road site and an approximately 10 to 15-acre portion of the adjacent Anacostia River. The purpose of this RI/FS is to define the nature and extent of contamination from the Benning Road site and to evaluate remedial alternatives. Pursuant to an internal agreement between the Pepco Entities, since 2013, Pepco has performed the work required by the Consent Decree and has been reimbursed for that work by an agreed upon allocation of costs between the Pepco Entities. In September 2019, the Pepco Entities issued a draft “final” RI report which DOEE approved on February 3, 2020. The Pepco Entities are completing a FS to evaluate possible remedial alternatives for submission to DOEE. In October, 2022, DOEE approved dividing the work to complete the landside portion of the FS from the waterside portion to expedite the overall schedule for completion of the project. After completion and approval of the landside FS, now scheduled for September 2023, DOEE will prepare a Proposed Plan for public comment and then issue a Record of Decision (ROD) identifying any further response actions determined to be necessary to address any landside issues. The DOEE will issue a separate ROD for the waterside FS when that work is completed which is now anticipated to be by March 31, 2024. As part of the separation between Exelon and Constellation in February 2022, the internal agreement between the Pepco Entities for completion and payment for the remaining Consent Decree work was memorialized in a formal agreement for post-separation activities. A second post-separation assumption agreement between Exelon and Constellation transferred any of the potential remaining remediation liability, if any, of PES/Generation to a non-utility subsidiary of Exelon which going forward will be responsible for those liabilities. Exelon, PHI, and Pepco have determined that a loss associated with this matter is probable and have accrued an estimated liability, which is included in the table above. Anacostia River Tidal Reach (Exelon, PHI, and Pepco). Contemporaneous with the Benning Road site RI/FS being performed by the Pepco Entities, DOEE and NPS have been conducting a separate RI/FS focused on the entire tidal reach of the Anacostia River extending from just north of the Maryland-District of Columbia boundary line to the confluence of the Anacostia and Potomac Rivers. The river-wide RI incorporated the results of the river sampling performed by the Pepco Entities as part of the Benning RI/FS, as well as similar sampling efforts conducted by owners of other sites adjacent to this segment of the river and supplemental river sampling conducted by DOEE’s contractor. On September 30, 2020, DOEE released its Interim ROD. The Interim ROD reflects an adaptive management approach which will require several identified “hot spots” in the river to be addressed first while continuing to conduct studies and to monitor the river to evaluate improvements and determine potential future remediation plans. The adaptive management process chosen by DOEE is less intrusive, provides more long-term environmental certainty, is less costly, and allows for site specific remediation plans already underway, including the plan for the Benning Road site to proceed to conclusion. On July 15, 2022, Pepco received a letter from the District of Columbia's Office of the Attorney General (D.C. OAG) on behalf of DOEE conveying a settlement offer to resolve all PRPs' liability to the District of Columbia (District) for their past costs and their anticipated future costs to complete the work for the Interim ROD. Pepco responded on July 27, 2022 to enter into settlement discussions. Since that time Exelon and the other PRP’s at the site have exchanged letters with the D.C. OAG exploring potential settlement options. Those discussions are ongoing. Exelon, PHI, and Pepco have determined that it is probable that costs for remediation will be incurred and have accrued a liability for management's best estimate of its share of the costs. Pepco concluded that incremental exposure remains reasonably possible, but management cannot reasonably estimate a range of loss beyond the amounts recorded, which are included in the table above. In addition to the activities associated with the remedial process outlined above, CERCLA separately requires federal and state (here including Washington, D.C.) Natural Resource Trustees (federal or state agencies designated by the President or the relevant state, respectively, or Indian tribes) to conduct an assessment of any damages to natural resources within their jurisdiction as a result of the contamination that is being remediated. The Trustees can seek compensation from responsible parties for such damages, including restoration costs. During the second quarter of 2018, Pepco became aware that the Trustees are in the beginning stages of a Natural Resources Damages (NRD) assessment, a process that often takes many years beyond the remedial decision to complete. Pepco has entered into negotiations with the Trustees to evaluate possible incorporation of NRD assessment and restoration as part of its remedial activities associated with the Benning site to accelerate the NRD benefits for that portion of the Anacostia River Sediment Project (ARSP) assessment. Pepco has concluded that a loss associated with the eventual NRD assessment is reasonably possible. Due to the very early stage of the assessment process, Pepco cannot reasonably estimate the final range of loss potentially resulting from this process. As noted in the Benning Road Site disclosure above, as part of the separation of Exelon and Constellation in February 2022, an assumption agreement was executed transferring any potential future remediation liabilities associated with the Benning Site remediation to a non-utility subsidiary of Exelon. Similarly, any potential future liability associated with the ARSP was also assumed by this entity. Buzzard Point Site (Exelon, PHI, and Pepco). On December 8, 2022, Pepco received a letter from the D.C. OAG, alleging wholly past violations of the District's stormwater discharge and waste disposal requirements related to operations at the Buzzard Point facility, a 9-acre parcel of waterfront property in Washington, D.C. occupied by an active substation and former steam plant building. The letter also alleged wholly past violations by Pepco of stormwater discharge requirements related to its district-wide system of underground vaults. The D.C. OAG invited Pepco to resolve the threatened enforcement action through a court-approved consent decree, and Pepco is engaged in discussions with the D.C. OAG regarding a potential resolution. Exelon, PHI, and Pepco have determined that a loss associated with this matter is probable and have accrued an estimated liability. Due to the very early stage of the assessment process, Pepco concluded that incremental exposure is reasonably possible, but the range of loss cannot be reasonably estimated beyond the amounts included in the table above. Litigation and Regulatory Matters Fund Transfer Restrictions (All Registrants). Under applicable law, Exelon may borrow or receive an extension of credit from its subsidiaries. Under the terms of Exelon’s intercompany money pool agreement, Exelon can lend to, but not borrow from the money pool. Under applicable law, ComEd, PECO, BGE, PHI, Pepco, DPL, and ACE can pay dividends only from retained, undistributed or current earnings. A significant loss recorded at ComEd, PECO, BGE, PHI, Pepco, DPL, or ACE may limit the dividends that these companies can distribute to Exelon. ComEd has agreed in connection with financings arranged through ComEd Financing III that it will not declare dividends on any shares of its capital stock in the event that: (1) it exercises its right to extend the interest payment periods on the subordinated debt securities issued to ComEd Financing III; (2) it defaults on its guarantee of the payment of distributions on the preferred trust securities of ComEd Financing III; or (3) an event of default occurs under the Indenture under which the subordinated debt securities are issued. No such event has occurred. PECO has agreed in connection with financings arranged through PEC L.P. and PECO Trust IV that PECO will not declare dividends on any shares of its capital stock in the event that: (1) it exercises its right to extend the interest payment periods on the subordinated debentures, which were issued to PEC L.P. or PECO Trust IV; (2) it defaults on its guarantee of the payment of distributions on the Series D Preferred Securities of PEC L.P. or the preferred trust securities of PECO Trust IV; or (3) an event of default occurs under the Indenture under which the subordinated debentures are issued. No such event has occurred. BGE is subject to restrictions established by the MDPSC that prohibit BGE from paying a dividend on its common shares if (a) after the dividend payment, BGE’s equity ratio would be below 48% as calculated pursuant to the MDPSC’s ratemaking precedents or (b) BGE’s senior unsecured credit rating is rated by two of the three major credit rating agencies below investment grade. No such event has occurred. Pepco is subject to certain dividend restrictions established by settlements approved by the MDPSC and DCPSC that prohibit Pepco from paying a dividend on its common shares if (a) after the dividend payment, Pepco's equity ratio would be 48% as calculated pursuant to the MDPSC's and DCPSC's ratemaking precedents, of or (b) Pepco’s senior unsecured credit rating is rated by one of the three major credit rating agencies below investment grade. No such event has occurred. DPL is subject to certain dividend restrictions established by settlements approved by the DEPSC and MDPSC that prohibit DPL from paying a dividend on its common shares if (a) after the dividend payment, DPL's equity ratio would be 48% as calculated pursuant to the DCPSC's and MDPSC's ratemaking precedents, or (b) DPL’s corporate issuer or senior unsecured credit rating, or its equivalent, is rated by any of the three major credit rating agencies below the generally accepted definition of investment grade. No such event has occurred. ACE is subject to certain dividend restrictions established by settlements approved by the NJBPU that prohibit ACE from paying a dividend on its common shares if (a) after the dividend payment, ACE's common equity ratio would be 48% as calculated pursuant to the NJBPU's ratemaking precedents, or (b) ACE's senior corporate issuer or senior unsecured credit rating is rated by one of the three major credit rating agencies below investment grade. ACE is also subject to a dividend restriction which requires ACE to notify and obtain the prior approval of the NJBPU before dividends can be paid if its equity as a percent of its total capitalization, excluding securitization debt, falls below 30%. No such events have occurred. DPA and Related Matters (Exelon and ComEd). Exelon and ComEd received a grand jury subpoena in the second quarter of 2019 from the U.S. Attorney’s Office for the Northern District of Illinois (USAO) requiring production of information concerning their lobbying activities in the State of Illinois. On October 4, 2019, Exelon and ComEd received a second grand jury subpoena from the USAO requiring production of records of any communications with certain individuals and entities. On October 22, 2019, the SEC notified Exelon and ComEd that it had also opened an investigation into their lobbying activities. On July 17, 2020, ComEd entered into a DPA with the USAO to resolve the USAO investigation. Under the DPA, the USAO filed a single charge alleging that ComEd improperly gave and offered to give jobs, vendor subcontracts, and payments associated with those jobs and subcontracts for the benefit of the former Speaker of the Illinois House of Representatives and the Speaker’s associates, with the intent to influence the Speaker’s action regarding legislation affecting ComEd’s interests. The DPA provides that the USAO will defer any prosecution of such charge and any other criminal or civil case against ComEd in connection with the matters identified therein for a three-year period subject to certain obligations of ComEd, including payment to the U.S. Treasury of $200 million, which was paid in November 2020. Exelon was not made a party to the DPA, and therefore the investigation by the USAO into Exelon’s activities ended with no charges being brought against Exelon. The SEC’s investigation remains ongoing and Exelon and ComEd have cooperated fully and intend to continue to cooperate fully with the SEC. Exelon and ComEd cannot predict the outcome of the SEC investigation. No loss contingency has been reflected in Exelon's and ComEd's consolidated financial statements with respect to the SEC investigation, as this contingency is neither probable nor reasonably estimable at this time. Subsequent to Exelon announcing the receipt of the subpoenas, various lawsuits were filed, and various demand letters were received related to the subject of the subpoenas, the conduct described in the DPA and the SEC's investigation, including: • Four putative class action lawsuits against ComEd and Exelon were filed in federal court on behalf of ComEd customers in the third quarter of 2020 alleging, among other things, civil violations of federal racketeering laws. In addition, the Citizens Utility Board (CUB) filed a motion to intervene in these cases on October 22, 2020 which was granted on December 23, 2020. On December 2, 2020, the court appointed interim lead plaintiffs in the federal cases which consisted of counsel for three of the four federal cases. These plaintiffs filed a consolidated complaint on January 5, 2021. CUB also filed its own complaint against ComEd only on the same day. The remaining federal case, Potter, et al. v. Exelon et al, differed from the other lawsuits as it named additional individual defendants not named in the consolidated complaint. However, the Potter plaintiffs voluntarily dismissed their complaint without prejudice on April 5, 2021. ComEd and Exelon moved to dismiss the consolidated class action complaint and CUB’s complaint on February 4, 2021 and briefing was completed on March 22, 2021. On March 25, 2021, the parties agreed, along with state court plaintiffs, discussed below, to jointly engage in mediation. The parties participated in a one-day mediation on June 7, 2021 but no settlement was reached. On September 9, 2021, the federal court granted Exelon’s and ComEd’s motion to dismiss and dismissed the plaintiffs’ and CUB’s federal law claim with prejudice. The federal court also dismissed the related state law claims made by the federal plaintiffs and CUB on jurisdictional grounds. Plaintiffs appealed dismissal of the federal law claim to the Seventh Circuit Court of Appeals. Plaintiffs and CUB also refiled their state law claims in state court and moved to consolidate them with the already pending consumer state court class action, discussed below. On August 22, 2022, the Seventh Circuit affirmed the dismissal of the consolidated federal cases in their entirety. The time to further appeal has passed and the Seventh Circuit’s decision is final. • Three putative class action lawsuits against ComEd and Exelon were filed in Illinois state court in the third quarter of 2020 seeking restitution and compensatory damages on behalf of ComEd customers. The cases were consolidated into a single action in October of 2020. In November 2020, CUB filed a motion to intervene in the cases pursuant to an Illinois statute allowing CUB to intervene as a party or otherwise participate on behalf of utility consumers in any proceeding which affects the interest of utility consumers. On November 23, 2020, the court allowed CUB’s intervention, but denied CUB's request to stay these cases. Plaintiffs subsequently filed a consolidated complaint, and ComEd and Exelon filed a motion to dismiss on jurisdictional and substantive grounds on January 11, 2021. Briefing on that motion was completed on March 2, 2021. The parties agreed, on March 25, 2021, along with the federal court plaintiffs discussed above, to jointly engage in mediation. The parties participated in a one-day mediation on June 7, 2021 but no settlement was reached. On December 23, 2021, the state court granted ComEd and Exelon’s motion to dismiss with prejudice. On December 30, 2021, plaintiffs filed a motion to reconsider that dismissal and for permission to amend their complaint. The court denied the plaintiffs' motion on January 21, 2022. Plaintiffs have appealed the court's ruling dismissing their complaint to the First District Court of Appeals. On February 15, 2022, Exelon and ComEd moved to dismiss the federal plaintiffs' refiled state law claims, seeking dismissal on the same legal grounds asserted in their motion to dismiss the original state court plaintiffs' complaint. The court granted dismissal of the refiled state claims on February 16, 2022. The original federal plaintiffs appealed that dismissal on February 18, 2022. The two state appeals were consolidated on March 21, 2022. Plaintiffs' opening appellate brief was filed on August 5, 2022. Exelon and ComEd's response was filed on November 18, 2022. Plaintiffs filed their reply brief on January 13, 2023. • On November 3, 2022, a plaintiff filed a complaint with the Lake County, Illinois Circuit Court against ComEd and Exelon for unjust enrichment and deceptive business practices in connection with the conduct giving rise to the DPA. Plaintiff seeks an accounting and disgorgement of any benefits ComEd allegedly obtained from said conduct. ComEd and Exelon filed a motion to dismiss the Complaint on February 3, 2023. Plaintiff’s response is due March 3, 2023, and ComEd and Exelon’s reply is due March 24, 2023. Oral argument on the motion to dismiss is currently set for April 21, 2023. Plaintiffs served initial discovery requests on ComEd in December 2022, to which ComEd has responded. • A putative class action lawsuit against Exelon and certain officers of Exelon and ComEd was filed in federal court in December 2019 alleging misrepresentations and omissions in Exelon’s SEC filings related to ComEd’s lobbying activities and the related investigations. The complaint was amended on September 16, 2020, to dismiss two of the original defendants and add other defendants, including ComEd. Defendants filed a motion to dismiss in November 2020. The court denied the motion in April 2021. On May 26, 2021, defendants moved the court to certify its order denying the motion to dismiss for interlocutory appeal. Briefing on the motion was completed in June 2021. That motion was denied on January 28, 2022. In May 2021, the parties each filed respective initial discovery disclosures. On June 9, 2021, defendants filed their answer and affirmative defenses to the complaint and the parties engaged thereafter in discovery. On September 9, 2021, the U.S. government moved to intervene in the lawsuit and stay discovery until the parties entered into an amendment to their protective order that would prohibit the parties from requesting discovery into certain matters, including communications with the U.S. government. The court ordered said amendment to the protective order on November 15, 2021 and discovery resumed. The court further amended the protective order on October 17, 2022 and extended it until May 15, 2023. The next court status is set for May 8, 2023. Discovery remains ongoing. • Several shareholders have sent letters to the Exelon Board of Directors from 2020 through May 2022 demanding, among other things, that the Exelon Board of Directors investigate and address alleged breaches of fiduciary duties and other alleged violations by Exelon and ComEd officers and directors related to the conduct described in the DPA. In the first quarter of 2021, the Exelon Board of Directors appointed a Special Litigation Committee (SLC) consisting of disinterested and independent parties to investigate and address these shareholders' allegations and make recommendations to the Exelon Board of Directors based on the outcome of the SLC's investigation. In July 2021, one of the demand letter shareholders filed a derivative action against current and former Exelon and ComEd officers and directors, and against Exelon, as nominal defendant, asserting the same claims made in its demand letter. On October 12, 2021, the parties to the derivative action filed an agreed motion to stay that litigation for 120 days in order to allow the SLC to continue its investigation, which the court granted. The stay has been extended, by agreement of the parties several times and is currently in effect until March 17, 2023. The Parties have scheduled a mediation of this action for February 2023. • Two separate shareholder requests seeking review of certain Exelon books and records were received in August 2021 and January 2022. Exelon responded to both requests and both shareholders have since sent formal shareholder demands to the Exelon Board, as discussed above. No loss contingencies have been reflected in Exelon’s and ComEd’s consolidated financial statements with respect to these matters, as such contingencies are neither probable nor reasonably estimable at this time. In August 2022, the ICC concluded its investigation initiated on August 12, 2021 into rate impacts of conduct admitted in the DPA, including the costs recovered from customers related to the DPA and Exelon's funding of the fine paid by ComEd. On August 17, 2022, the ICC issued its final order accepting ComEd's voluntary customer refund offer of approximately $38 million (of which about $31 million is ICC jurisdictional; the remaining balance is FERC jurisdictional) that resolves the question of whether customer funds were used for DPA related activities. The customer refund includes the cost of every individual or entity that was either (i) identified in the DPA or (ii) identified by ComEd as an associate of the former Speaker of the Illinois House of Representatives in the ICC proceeding. The ICC rejected an argument by the Illinois Attorney General, City of Chicago, and CUB that a costly permanent adjustment also needed to be made to ComEd's ratemaking capital structure on account of Exelon having funded ComEd's payment of the DPA fine with an equity infusion. On October 6, the ICC denied the application for rehearing filed by the Illinois Attorney General, City of Chicago, and CUB that specifically focused on their capital structure argument. The window to file an appeal on the ICC final order has expired and the ICC’s DPA investigation is now closed. An accrual for the amount of the voluntary customer refund has been recorded in Regulatory liabilities and Regulatory assets in Exelon’s and ComEd’s Consolidated Balance Sheets as of December 31, 2022. The ICC jurisdictional refund must be made in April 2023; the FERC jurisdictional refund will be made as part of the next transmission formula rate update proceeding in 2023. The customer refund will not be recovered in rates or charged to customers and ComEd will not seek or accept reimbursement or indemnification from any source other than Exelon. Savings Plan Claim (Exelon). On December 6, 2021, seven current and former employees filed a putative ERISA class action suit in U.S. District Court for the Northern District of Illinois against Exelon, its Board of Directors, the former Board Investment Oversight C

Shareholders' Equity (All Regis

Shareholders' Equity (All Registrants)	12 Months Ended
Shareholders' Equity (All Registrants)	Dec. 31, 2022
Equity [Abstract]
Shareholders' Equity (All Registrants) [Text Block]	Shareholders' Equity (All Registrants) Equity Securities Offering (Exelon) On August 4, 2022, Exelon entered into an agreement with certain underwriters in connection with an underwritten public offering (the “Offering”) of 11.3 million shares (the “Shares”) of its common stock, no par value (“Common Stock”). The Shares were sold to the underwriters at a price per share of $43.32. Exelon also granted the underwriters an option to purchase an additional 1.695 million shares of Common Stock also at the price per share of $43.32. On August 5, 2022, the underwriters exercised the option in full. The net proceeds from the Offering and the exercise of the underwriters’ option were $563 million before expenses paid by Exelon. Exelon used the proceeds, together with available cash balances, to repay $575 million in borrowings under a $1.15 billion term loan credit facility. See Note 16 — Debt and Credit Agreements for additional information on Exelon’s term loan. At-the-Market (ATM) Program (Exelon) On August 4, 2022, Exelon executed an equity distribution agreement (“Equity Distribution Agreement”), with certain sales agents and forward sellers and certain forward purchasers, establishing an ATM equity distribution program under which it may offer and sell shares of its Common Stock, having an aggregate gross sales price of up to $1.0 billion. Exelon has no obligation to offer or sell any shares of Common Stock under the Equity Distribution Agreement and may, at any time, suspend or terminate offers and sales under the Equity Distribution Agreement. As of December 31, 2022, Exelon has not issued any shares of Common Stock under the ATM program and has not entered into any forward sale agreements. ComEd Common Stock Warrants The following table presents warrants outstanding to purchase ComEd common stock and shares of common stock reserved for the conversion of warrants. The warrants entitle the holders to convert such warrants into common stock of ComEd at a conversion rate of one share of common stock for three warrants. December 31, 2022 2021 Warrants outstanding 60,052 60,061 Common Stock reserved for conversion 20,017 20,020 Share Repurchases There currently is no Exelon Board of Director authority to repurchase shares. Any previous shares repurchased are held as treasury shares, at cost, unless cancelled or reissued at the discretion of Exelon’s management. Preferred and Preference Securities The following table presents Exelon, ComEd, PECO, BGE, Pepco, and ACE's shares of preferred securities authorized, none of which were outstanding, as of December 31, 2022 and 2021. There are no shares of preferred securities authorized for DPL. Preferred Securities Authorized Exelon 100,000,000 ComEd 850,000 PECO 15,000,000 BGE 1,000,000 Pepco 6,000,000 ACE (a) 2,799,979 _________ (a) Includes 799,979 shares of cumulative preferred stock and 2,000,000 of no-par preferred stock as of December 31, 2022 and 2021. The following table presents ComEd's, BGE's, and ACE's preference securities authorized, none of which were outstanding as of December 31, 2022 and 2021. There are no shares of preference securities authorized for Exelon, PECO, Pepco, and DPL. Preference Securities Authorized ComEd 6,810,451 BGE (a) 6,500,000 ACE 3,000,000 __________ (a) Includes 4,600,000 shares of unclassified preference securities and 1,900,000 shares of previously redeemed preference securities as of December 31, 2022 and 2021.

Stock-Based Compensation Plans

Stock-Based Compensation Plans Stock-Based Compensation Plans (All Registrants)	12 Months Ended
	Dec. 31, 2022
Share-Based Payment Arrangement [Abstract]
Stock-Based Compensation Plans	Stock-Based Compensation Plans (All Registrants) Stock-Based Compensation Plans Exelon grants stock-based awards through its LTIP, which primarily includes performance share awards, restricted stock units, and stock options. At December 31, 2022, there were approximately 34 million shares authorized for issuance under the LTIP. For the years ended December 31, 2022, 2021, and 2020, exercised and distributed stock-based awards were primarily issued from authorized but unissued common stock shares. Separation-related Adjustments. In connection with the separation, Exelon and Constellation entered into an Employee Matters Agreement, effective February 1, 2022. Under the terms of the Employee Matters Agreement, and pursuant to the terms of the LTIP, the Compensation Committee of the Board of Exelon approved an adjustment to outstanding awards granted under the LTIP in order to preserve the intrinsic aggregate value of such awards before the separation. The separation-related adjustments did not have a material impact on either compensation expense or the potentially dilutive securities to be considered in the calculation of diluted earnings per share of common stock. Former Exelon employees transferred to Constellation as a result of the separation surrendered their outstanding unvested Exelon awards effective February 1, 2022. The Registrants grant cash awards. The following table does not include expense related to these plans as they are not considered stock-based compensation plans under the applicable authoritative guidance. The following table presents the stock-based compensation expense included in Exelon's Consolidated Statements of Operations and Comprehensive Income. The Utility Registrants' stock-based compensation expense for the years ended December 31, 2022, 2021, and 2020 was not material. Year Ended December 31, Exelon 2022 2021 2020 Total stock-based compensation expense included in operating and maintenance expense $ 41 $ 95 $ 37 Income tax benefit (10) (25) (9) Total after-tax stock-based compensation expense $ 31 $ 70 $ 28 Exelon receives a tax deduction based on the intrinsic value of the award on the exercise date for stock options and the distribution date for performance share awards and restricted stock units. For each award, throughout the requisite service period, Exelon recognizes the tax benefit related to compensation costs. The following table presents information regarding Exelon’s realized tax benefit when distributed: Year Ended December 31, 2022 2021 2020 Performance share awards $ 6 $ 6 $ 15 Restricted stock units 6 6 8 Performance Share Awards Performance share awards are granted under the LTIP. The performance share awards are settled 50% in common stock and 50% in cash at the end of the three-year performance period, except for awards that are settled 100% in cash if certain ownership requirements are satisfied. The common stock portion of the performance share awards is considered an equity award and is valued based on Exelon's stock price on the grant date. The cash portion of the performance share awards is considered a liability award which is remeasured each reporting period based on Exelon’s current stock price. As the value of the common stock and cash portions of the awards are based on Exelon’s stock price during the performance period, coupled with changes in the total shareholder return modifier and expected payout of the award, the compensation costs are subject to volatility until payout is established. For nonretirement-eligible employees, stock-based compensation costs are recognized over the vesting period of three years using the straight-line method. For performance share awards granted to retirement-eligible employees, the value of the performance shares is recognized ratably over the vesting period, which is the year of grant. Exelon processes forfeitures as they occur for employees who do not complete the requisite service period. The following table summarizes Exelon’s nonvested performance share awards activity: Shares Weighted Average Nonvested at December 31, 2021 (a) 1,222,516 $ 44.96 Granted 727,697 43.05 Change in performance (216,981) 42.73 Vested (233,318) 47.39 Forfeited (86,128) 42.61 Awards surrendered as a result of the separation (2,308,745) Awards granted in conversion as a result of the separation 1,870,990 Undistributed vested awards (b)(c) (109,226) 4.55 Nonvested at December 31, 2022 (a) 866,805 $ 41.86 __________ (a) Excludes 1,539,819 and 1,934,238 of performance share awards issued to retirement-eligible employees as of December 31, 2022 and 2021, respectively, as they are fully vested. (b) The significant reduction in weighted average grant date fair value during 2022 primarily resulted from more pre-separation shares being surrendered than shares issued to Exelon retirement eligible employees post-separation. (c) Represents performance share awards that vested but were not distributed to retirement-eligible employees during 2022. The following table summarizes the weighted average grant date fair value and the total fair value of performance share awards vested. Year Ended December 31, 2022 (a) 2021 2020 Weighted average grant date fair value (per share) $ 43.05 $ 43.37 $ 46.61 Total fair value of performance shares vested 29 44 39 Total fair value of performance shares settled in cash 25 28 63 __________ (a) As of December 31, 2022, $12 million of total unrecognized compensation costs related to nonvested performance shares are expected to be recognized over the remaining weighted-average period of 1.8 years. Restricted Stock Units Restricted stock units are granted under the LTIP with the majority being settled in a specific number of shares of common stock after the service condition has been met. The corresponding cost of services is measured based on the grant date fair value of the restricted stock unit issued. The value of the restricted stock units is expensed over the requisite service period using the straight-line method. The requisite service period for restricted stock units is generally three The following table summarizes Exelon’s nonvested restricted stock unit activity: Shares Weighted Average Nonvested at December 31, 2021 (a) 1,142,049 $ 43.52 Granted 468,514 42.97 Vested (499,621) 42.28 Forfeited (71,816) 41.89 Awards surrendered as a result of the separation (943,509) Awards granted in conversion as a result of the separation 643,994 Undistributed vested awards (b) (178,450) 38.24 Nonvested at December 31, 2022 (a) 561,161 $ 41.98 __________ (a) Excludes 476,592 and 609,934 of restricted stock units issued to retirement-eligible employees as of December 31, 2022 and 2021, respectively, as they are fully vested. (b) Represents restricted stock units that vested but were not distributed to retirement-eligible employees during 2022. The following table summarizes the weighted average grant date fair value and the total fair value of restricted stock units vested. Year Ended December 31, 2022 (a) 2021 2020 Weighted average grant date fair value (per share) $ 42.97 $ 44.21 $ 46.33 Total fair value of restricted stock units vested 23 34 54 __________ (a) As of December 31, 2022, $11 million of total unrecognized compensation costs related to nonvested restricted stock units are expected to be recognized over the remaining weighted-average period of 1.90 years. Stock Options Non-qualified stock options to purchase shares of Exelon’s common stock were granted through 2012 under the LTIP. The exercise price of the stock options is equal to the fair market value of the underlying stock on the date of option grant. Stock options will expire no later than ten years from the date of grant. At December 31, 2022 all stock options were vested and exercised. The following table presents information with respect to stock option activity: Shares Weighted Weighted Aggregate Balance of shares outstanding at December 31, 2021 27,007 $ 46.47 0.15 $ — Options exercised (27,644) 38.56 — Options expired — — Awards surrendered as a result of the separation (2,000) Awards granted in conversion as a result of the separation 2,637 Balance of shares outstanding at December 31, 2022 — $ — 0 $ — Exercisable at December 31, 2022 — $ — 0 $ — The following table summarizes additional information regarding stock options exercised: Year Ended December 31, 2022 2021 2020 Intrinsic value (a) $ — $ 11 $ 5 Cash received for exercise price 1 37 18 __________ (a) The difference between the market value on the date of exercise and the option exercise price.

Changes in Accumulated Other Co

Changes in Accumulated Other Comprehensive Income (Exelon)	12 Months Ended
Changes in Accumulated Other Comprehensive Income (Exelon)	Dec. 31, 2022
Equity [Abstract]
Changes in Accumulated Other Comprehensive Income (Exelon)	Changes in Accumulated Other Comprehensive Income (Exelon) The following tables present changes in Exelon's AOCI, net of tax, by component: Cash Flow Pension and (a) Foreign Total Balance at December 31, 2019 $ (2) $ (3,165) $ (27) $ (3,194) OCI before reclassifications (3) (357) 4 (356) Amounts reclassified from AOCI — 150 — 150 Net current-period OCI (3) (207) 4 (206) Balance at December 31, 2020 $ (5) $ (3,372) $ (23) $ (3,400) OCI before reclassifications (1) 432 — 431 Amounts reclassified from AOCI — 219 — 219 Net current-period OCI (1) 651 — 650 Balance at December 31, 2021 $ (6) $ (2,721) $ (23) $ (2,750) Separation of Constellation 6 1,994 23 2,023 OCI before reclassifications 2 46 — 48 Amounts reclassified from AOCI — 41 — 41 Net current-period OCI 2 87 — 89 Balance at December 31, 2022 $ 2 $ (640) $ — $ (638) __________ (a) This AOCI component is included in the computation of net periodic pension and OPEB cost. Additionally, as of February 1, 2022, in connection with the separation, Exelon's pension and OPEB plans were remeasured. See Note 14 — Retirement Benefits for additional information. See Exelon's Statements of Operations and Comprehensive Income for individual components of AOCI. The following table presents income tax benefit (expense) allocated to each component of Exelon's other comprehensive income (loss): For the Years Ended December 31, 2022 2021 2020 Pension and non-pension postretirement benefit plans: Prior service benefit reclassified to periodic benefit cost $ — $ 4 $ 16 Actuarial loss reclassified to periodic benefit cost (14) (76) (66) Pension and non-pension postretirement benefit plans valuation adjustment (14) (153) 122

Supplemental Financial Informat

Supplemental Financial Information (All Registrants)	12 Months Ended
Supplemental Financial Information (All Registrants)	Dec. 31, 2022
Supplemental Financial Information [Abstract]
Supplemental Financial Information (All Registrants)	Supplemental Financial Information (All Registrants) Supplemental Statement of Operations Information The following tables provide additional information about material items recorded in the Registrants' Consolidated Statements of Operations and Comprehensive Income. Taxes other than income taxes Exelon ComEd PECO BGE PHI Pepco DPL ACE For the year ended December 31, 2022 Utility (a) $ 878 $ 306 $ 166 $ 94 $ 312 $ 283 $ 25 $ 4 Property 377 31 17 191 138 94 42 2 Payroll 117 28 16 17 25 6 4 3 For the year ended December 31, 2021 Utility (a) $ 774 $ 246 $ 139 $ 88 $ 301 $ 278 $ 22 $ 3 Property 364 39 18 176 131 88 40 3 Payroll 124 27 16 18 27 7 5 3 For the year ended December 31, 2020 Utility (a) $ 759 $ 238 $ 135 $ 87 $ 299 $ 275 $ 21 $ 3 Property 336 30 16 164 126 84 39 3 Payroll 121 27 16 17 25 7 5 3 __________ (a) The Registrants’ utility taxes represents municipal and state utility taxes and gross receipts taxes related to their operating revenues. The offsetting collection of utility taxes from customers is recorded in revenues in the Registrants’ Consolidated Statements of Operations and Comprehensive Income. Other, net Exelon ComEd PECO BGE PHI Pepco DPL ACE For the year ended December 31, 2022 AFUDC—Equity $ 150 $ 35 $ 31 $ 21 $ 63 $ 48 $ 7 $ 8 Non-service net periodic benefit cost 63 — — — — — — — For the year ended December 31, 2021 AFUDC—Equity $ 136 $ 34 $ 26 $ 27 $ 49 $ 40 $ 6 $ 3 Non-service net periodic benefit cost 91 — — — — — — — For the year ended December 31, 2020 AFUDC—Equity $ 104 $ 29 $ 17 $ 22 $ 36 $ 28 $ 4 $ 4 Non-service net periodic benefit cost 53 — — — — — — — Supplemental Cash Flow Information The following tables provide additional information about material items recorded in the Registrants' Consolidated Statements of Cash Flows. Depreciation, amortization, and accretion Exelon (a) ComEd PECO BGE PHI Pepco DPL ACE For the year ended December 31, 2022 Property, plant, and equipment (b) $ 2,690 $ 1,031 $ 359 $ 476 $ 680 $ 288 $ 191 $ 173 Amortization of regulatory assets (b) 718 292 14 154 258 129 41 88 Amortization of intangible assets, net (b) 12 — — — — — — — Amortization of energy contract assets and liabilities (c) 3 — — — — — — — Nuclear fuel (d) 66 — — — — — — — ARO accretion (e) 44 — — — — — — — Total depreciation, amortization, and accretion $ 3,533 $ 1,323 $ 373 $ 630 $ 938 $ 417 $ 232 $ 261 For the year ended December 31, 2021 Property, plant, and equipment (b) $ 5,384 $ 970 $ 336 $ 439 $ 627 $ 274 $ 169 $ 155 Amortization of regulatory assets (b) 594 235 12 152 194 129 41 24 Amortization of intangible assets, net (b) 58 — — — — — — — Amortization of energy contract assets and liabilities (c) 31 — — — — — — — Nuclear fuel (d) 992 — — — — — — — ARO accretion (e) 514 — — — — — — — Total depreciation, amortization, and accretion $ 7,573 $ 1,205 $ 348 $ 591 $ 821 $ 403 $ 210 $ 179 For the year ended December 31, 2020 Property, plant, and equipment (b) $ 4,364 $ 922 $ 319 $ 397 $ 586 $ 257 $ 155 $ 140 Amortization of regulatory assets (b) 588 211 28 153 196 120 36 40 Amortization of intangible assets, net (b) 62 — — — — — — — Amortization of energy contract assets and liabilities (c) 30 — — — — — — — Nuclear fuel (d) 983 — — — — — — — ARO accretion (e) 500 — — — — — — — Total depreciation, amortization, and accretion $ 6,527 $ 1,133 $ 347 $ 550 $ 782 $ 377 $ 191 $ 180 __________ (a) Exelon's amounts include amounts related to Generation prior to the separation. See Note 2 — Discontinued Operations for additional information. (b) Included in Depreciation and amortization in the Registrants' Consolidated Statements of Operations and Comprehensive Income. (c) Included in Electric operating revenues or Purchased power expense in Exelon’s Consolidated Statements of Operations and Comprehensive Income. (d) Included in Purchased fuel expense in Exelon’s Consolidated Statements of Operations and Comprehensive Income. (e) Included in Operating and maintenance expense in Exelon's Consolidated Statements of Operations and Comprehensive Income. Cash paid (refunded) during the year: Exelon (a) ComEd PECO BGE PHI Pepco DPL ACE For the year ended December 31, 2022 Interest (net of amount capitalized) $ 1,434 $ 396 $ 166 $ 147 $ 274 $ 141 $ 63 $ 60 Income taxes (net of refunds) 73 23 31 16 19 28 (2) (6) For the year ended December 31, 2021 Interest (net of amount capitalized) $ 1,505 $ 372 $ 152 $ 134 $ 255 $ 132 $ 59 $ 56 Income taxes (net of refunds) 281 (72) (4) (38) — 12 (9) 2 For the year ended December 31, 2020 Interest (net of amount capitalized) $ 1,521 $ 371 $ 144 $ 125 $ 257 $ 129 $ 61 $ 57 Income taxes (net of refunds) 10 (61) (37) (57) 46 40 12 (3) __________ (a) Exelon's amounts include amounts related to Generation prior to the separation. See Note 2 — Discontinued Operations for additional information. Other non-cash operating activities: Exelon (a) ComEd PECO BGE PHI Pepco DPL ACE For the year ended December 31, 2022 Pension and non-pension postretirement benefit costs $ 164 $ 60 $ (9) $ 44 $ 53 $ 9 $ 3 $ 12 Allowance for credit losses 173 46 45 25 58 29 12 16 Other decommissioning-related activity 36 — — — — — — — Energy-related options 60 — — — — — — — True-up adjustments to decoupling mechanisms and formula rates (b) (168) (267) (2) 47 54 31 7 16 Long-term incentive plan 42 — — — — — — — Amortization of operating ROU asset 56 2 — 14 27 7 8 3 AFUDC - Equity (150) (35) (31) (21) (63) (48) (7) (8) For the year ended December 31, 2021 Pension and non-pension postretirement benefit costs $ 411 $ 129 $ 8 $ 61 $ 49 $ 6 $ 2 $ 11 Allowance for credit losses 160 47 39 17 24 9 5 10 Other decommissioning-related activity (946) — — — — — — — Energy-related options 125 — — — — — — — True-up adjustments to decoupling mechanisms and formula rates (b) (171) (42) (26) (12) (91) (53) (14) (24) Severance costs (57) 2 — — 1 — — — Long-term incentive plan 137 — — — — — — — Amortization of operating ROU asset 183 1 — 29 28 6 8 4 AFUDC - Equity (136) (34) (26) (27) (49) (40) (6) (3) For the year ended December 31, 2020 Pension and non-pension postretirement benefit costs $ 411 $ 114 $ 5 $ 62 $ 70 $ 15 $ 7 $ 14 Allowance for credit losses 150 32 42 15 43 24 16 2 Other decommissioning-related activity (659) — — — — — — — Energy-related options 104 — — — — — — — True-up adjustments to decoupling mechanisms and formula rates (c) (6) 47 (16) (16) (21) (40) 7 12 Severance costs 105 1 1 — — — — — Provision for excess and obsolete inventory 131 2 1 — — — — — Long-term incentive plan 56 — — — — — — — Amortization of operating ROU Asset 222 2 1 31 28 7 8 3 Asset impairments — 15 — — 13 — 7 6 AFUDC - Equity (104) (29) (17) (22) (36) (28) (4) (4) __________ (a) Exelon's amounts include amounts related to Generation prior to the separation. See Note 2 — Discontinued Operations for additional information. (b) For ComEd, reflects the true-up adjustments in regulatory assets and liabilities associated with its distribution, energy efficiency, distributed generation, and transmission formula rates. For PECO, reflects the change in regulatory assets and liabilities associated with its transmission formula rate. For BGE, Pepco, DPL, and ACE, reflects the change in regulatory assets and liabilities associated with their decoupling mechanisms and transmission formula rates. See Note 3 — Regulatory Matters for additional information. (c) For ComEd, reflects the true-up adjustments in regulatory assets and liabilities associated with its distribution, energy efficiency, distributed generation, and transmission formula rates. For BGE, Pepco, and DPL, reflects the change in regulatory assets and liabilities associated with their decoupling mechanisms and transmission formula rates. For PECO and ACE, reflects the change in regulatory assets and liabilities associated with their transmission formula rates. See Note 3 — Regulatory Matters for additional information The following tables provide a reconciliation of cash, restricted cash, and cash equivalents reported within the Registrants' Consolidated Balance Sheets that sum to the total of the same amounts in their Consolidated Statements of Cash Flows. Exelon ComEd PECO BGE PHI Pepco DPL ACE December 31, 2022 Cash and cash equivalents $ 407 $ 67 $ 59 $ 43 $ 198 $ 45 $ 31 $ 72 Restricted cash and cash equivalents 566 327 9 24 175 54 121 — Restricted cash included in other long-term assets 117 117 — — — — — — Total cash, restricted cash, and cash equivalents $ 1,090 $ 511 $ 68 $ 67 $ 373 $ 99 $ 152 $ 72 December 31, 2021 Cash and cash equivalents $ 672 $ 131 $ 36 $ 51 $ 136 $ 34 $ 28 $ 29 Restricted cash and cash equivalents 321 210 8 4 77 34 43 — Restricted cash included in other long-term assets 44 43 — — — — — — Cash, restricted cash, and cash equivalents included in current assets of discontinued operations 582 — — — — — — — Total cash, restricted cash, and cash equivalents $ 1,619 $ 384 $ 44 $ 55 $ 213 $ 68 $ 71 $ 29 December 31, 2020 Cash and cash equivalents $ 432 $ 83 $ 19 $ 144 $ 111 $ 30 $ 15 $ 17 Restricted cash and cash equivalents 349 279 7 1 39 35 — 3 Restricted cash included in other long-term assets 53 43 — — 10 — — 10 Cash, restricted cash, and cash equivalents included in current assets of discontinued operations 332 — — — — — — — Total cash, restricted cash, and cash equivalents $ 1,166 $ 405 $ 26 $ 145 $ 160 $ 65 $ 15 $ 30 December 31, 2019 Cash and cash equivalents $ 587 $ 90 $ 21 $ 24 $ 131 $ 30 $ 13 $ 12 Restricted cash and cash equivalents 358 150 6 1 36 33 — 2 Restricted cash included in other long-term assets 177 163 — — 14 — — 14 Total cash, restricted cash, and cash equivalents (a) $ 1,122 $ 403 $ 27 $ 25 $ 181 $ 63 $ 13 $ 28 __________ (a) Exelon's amounts include amounts related to Generation prior to the separation. See Note 2 — Discontinued Operations for additional information. Supplemental Balance Sheet Information The following tables provide additional information about material items recorded in the Registrants' Consolidated Balance Sheets. Investments Exelon ComEd PECO BGE PHI Pepco December 31, 2022 Equity method investments: Other equity method investments $ 16 $ 6 $ 8 $ — $ — $ — Other investments: Employee benefit trusts and investments (a) 216 — 22 7 138 119 Total investments $ 232 $ 6 $ 30 $ 7 $ 138 $ 119 December 31, 2021 Equity method investments: Other equity method investments $ 15 $ 6 $ 7 $ — $ — $ — Other investments: Employee benefit trusts and investments (a) 235 — 27 14 145 120 Total investments $ 250 $ 6 $ 34 $ 14 $ 145 $ 120 __________ (a) The Registrants’ debt and equity security investments are recorded at fair market value. Accrued expenses Exelon ComEd PECO BGE PHI Pepco DPL ACE December 31, 2022 Compensation-related accruals (a) $ 613 $ 179 $ 81 $ 79 $ 104 $ 29 $ 20 $ 16 Taxes accrued 211 92 10 34 70 52 8 12 Interest accrued 338 124 47 42 61 32 9 14 December 31, 2021 Compensation-related accruals (a) $ 596 $ 155 $ 77 $ 78 $ 113 $ 35 $ 20 $ 17 Taxes accrued 253 94 14 53 96 88 9 11 Interest accrued 297 116 41 44 52 28 8 11 __________ (a) Primarily includes accrued payroll, bonuses and other incentives, vacation, and benefits.

Related Party Transactions (All

Related Party Transactions (All Registrants)	12 Months Ended
Related Party Transactions (All Registrants)	Dec. 31, 2022
Related Party Transactions [Abstract]
Related-Party Transactions (All Registrants)	Related Party Transactions (All Registrants) Utility Registrants' expense with Generation The Utility Registrants incurred expenses from transactions with the Generation affiliate as described in the footnotes to the table below prior to separation on February 1, 2022. Such expenses were primarily recorded as Purchased power from affiliates and an immaterial amount recorded as Operating and maintenance expense from affiliates at the Utility Registrants: For the Years Ended December 31, 2022 2021 2020 ComEd (a) $ 59 $ 376 $ 330 PECO (b) 33 196 190 BGE (c) 18 236 315 PHI 51 366 367 Pepco (d) 39 270 279 DPL (e) 10 79 75 ACE (f) 2 17 13 __________ (a) ComEd had an ICC-approved RFP contract with Generation to provide a portion of ComEd’s electric supply requirements. ComEd also purchased RECs and ZECs from Generation. (b) PECO received electric supply from Generation under contracts executed through PECO’s competitive procurement process. In addition, PECO had a ten-year agreement with Generation to sell solar AECs. (c) BGE received a portion of its energy requirements from Generation under its MDPSC-approved market-based SOS and gas commodity programs. (d) Pepco received electric supply from Generation under contracts executed through Pepco's competitive procurement process approved by the MDPSC and DCPSC. (e) DPL received a portion of its energy requirements from Generation under its MDPSC and DEPSC approved market-based SOS commodity programs. (f) ACE received electric supply from Generation under contracts executed through ACE's competitive procurement process approved by the NJBPU. Service Company Costs for Corporate Support The Registrants receive a variety of corporate support services from BSC. Pepco, DPL, and ACE also receive corporate support services from PHISCO. See Note 1 — Significant Accounting Policies for additional information regarding BSC and PHISCO. The following table presents the service company costs allocated to the Registrants: Operating and maintenance from affiliates Capitalized costs For the years ended December 31, For the years ended December 31, 2022 2021 2020 2022 2021 2020 Exelon BSC $ 707 $ 508 $ 531 PHISCO 80 72 61 ComEd BSC $ 316 $ 304 $ 283 311 207 186 PECO BSC 197 169 150 115 81 76 BGE BSC 204 189 170 122 92 132 PHI BSC 188 168 152 159 128 149 PHISCO — — — 80 72 61 Pepco BSC 110 96 85 60 50 55 PHISCO 112 114 120 33 31 27 DPL BSC 71 61 54 45 43 51 PHISCO 96 99 97 26 22 18 ACE BSC 57 53 45 54 33 40 PHISCO 84 86 87 21 19 16 Current Receivables from/Payables to affiliates The following tables present current Receivables from affiliates and current Payables to affiliates: December 31, 2022 Receivables from affiliates: Payables to affiliates: ComEd PECO BGE Pepco DPL ACE BSC PHISCO Other Total ComEd $ — $ — $ — $ — $ — $ 66 $ — $ 8 $ 74 PECO $ — — — — — 39 — 3 42 BGE — — — — — 38 — 1 39 PHI — — — — — — 4 — 10 14 Pepco — — — — — 20 13 1 34 DPL — 2 — — — 12 8 — 22 ACE — 2 — — — 14 9 1 26 Other 3 — — — — 1 — — 4 Total $ 3 $ 4 $ — $ — $ — $ 1 $ 193 $ 30 $ 24 $ 255 December 31, 2021 Receivables from affiliates: Payables to affiliates: ComEd PECO BGE Pepco DPL ACE Generation BSC PHISCO Other Total ComEd $ — $ — $ — $ — $ — $ 41 $ 71 $ — $ 9 $ 121 PECO $ — — — — — 30 36 — 4 70 BGE — — — — — 4 41 — 3 48 PHI — 1 — — — 1 — 5 — 9 16 Pepco — — 1 1 1 20 21 12 3 59 DPL — — — — — 4 17 11 1 33 ACE — — — — — 7 13 9 2 31 Generation 13 — — — — — 102 — 16 131 Other 3 — — — — — 11 — — 14 Total $ 16 $ 1 $ 1 $ — $ 1 $ 2 $ 117 $ 306 $ 32 $ 47 $ 523 Borrowings from Exelon/PHI intercompany money pool To provide an additional short-term borrowing option that will generally be more favorable to the borrowing participants than the cost of external financing both Exelon and PHI operate an intercompany money pool. PECO, and PHI Corporate participate in the Exelon money pool. Pepco, DPL, and ACE participate in the PHI intercompany money pool. Noncurrent Receivables from affiliates ComEd and PECO have noncurrent receivables with Constellation for estimated excess funds at the end of decommissioning the Regulatory Agreement Units, such amounts are due back to ComEd and PECO, as applicable, for payment to their respective customers. The receivables are recorded in Receivable related to Regulatory Agreement Units as of December 31, 2022 and in noncurrent Receivables from affiliates as of December 31, 2021. See Note 3 — Regulatory Matters of the Combined Notes to Consolidated Financial Statements for additional information. Long-term debt to financing trusts The following table presents Long-term debt to financing trusts: As of December 31, 2022 2021 Exelon ComEd PECO Exelon ComEd PECO ComEd Financing III $ 206 $ 205 $ — $ 206 $ 205 $ — PECO Trust III 81 — 81 81 — 81 PECO Trust IV 103 — 103 103 — 103 Total $ 390 $ 205 $ 184 $ 390 $ 205 $ 184 Charitable Contributions In December 2022, Exelon Corporation made an unconditional promise to give $20 million to the Exelon Foundation. The contribution was recorded in Operating and maintenance expense within the Consolidated Statements of Operations and Comprehensive Income with the offset in Accrued expenses and Other Deferred credits and other liabilities on the Consolidated Balance Sheets.

Schedule I - Condensed Financia

Schedule I - Condensed Financial Information of Parent (Exelon Corporate)	12 Months Ended
	Dec. 31, 2022
Condensed Financial Information Disclosure [Abstract]
Schedule I - Condensed Financial Information of Parent (Exelon Corporate)	Exelon Corporation and Subsidiary Companies Schedule I – Condensed Financial Information of Parent (Exelon Corporate) Condensed Statements of Operations and Other Comprehensive Income For the Years Ended December 31, (In millions) 2022 2021 2020 Operating expenses Operating and maintenance $ 25 $ (9) $ (2) Operating and maintenance from affiliates 4 14 10 Other 2 2 2 Total operating expenses 31 7 10 Operating loss (31) (7) (10) Other income and (deductions) Interest expense, net (413) (333) (378) Equity in earnings of investments 2,450 1,908 1,482 Interest income from affiliates, net 5 — 1 Other, net 22 — 15 Total other income 2,064 1,575 1,120 Income from continuing operations before income taxes 2,033 1,568 1,110 Income taxes (21) (48) 11 Net income from continuing operations after income taxes 2,054 1,616 1,099 Net income from discontinued operations after income taxes 116 90 864 Net income $ 2,170 $ 1,706 $ 1,963 Other comprehensive income (loss), net of income taxes Pension and non-pension postretirement benefit plans: Prior service benefit reclassified to periodic costs $ (1) $ (4) $ (40) Actuarial loss reclassified to periodic cost 42 223 190 Pension and non-pension postretirement benefit plan valuation adjustment 46 431 (357) Unrealized gain (loss) on cash flow hedges 2 — (1) Other comprehensive income (loss) 89 650 (208) Comprehensive income $ 2,259 $ 2,356 $ 1,755 Exelon Corporation and Subsidiary Companies Schedule I – Condensed Financial Information of Parent (Exelon Corporate) Condensed Statements of Cash Flows For the Years Ended December 31, (In millions) 2022 2021 2020 Net cash flows provided by operating activities $ 1,690 $ 3,629 $ 3,018 Cash flows from investing activities Changes in Exelon intercompany money pool 35 381 (477) Notes receivable from affiliates 274 — 550 Investment in affiliates (4,011) (2,231) (1,969) Other investing activities — 1 — Net cash flows used in investing activities (3,702) (1,849) (1,896) Cash flows from financing activities Changes in short-term borrowings 448 — (136) Proceeds from short-term borrowings with maturities greater than 90 days 1,150 500 — Repayments on short-term borrowings with maturities greater than 90 days (1,300) (350) — Issuance of long-term debt 3,350 — 2,000 Retirement of long-term debt (1,150) (300) (1,450) Issuance of common stock 563 — — Dividends paid on common stock (1,334) (1,497) (1,492) Proceeds from employee stock plans 36 80 45 Other financing activities (35) 19 (27) Net cash flows provided by (used in) financing activities 1,728 (1,548) (1,060) (Decrease) increase in cash, restricted cash, and cash equivalents (284) 232 62 Cash, restricted cash, and cash equivalents at beginning of period 295 63 1 Cash, restricted cash, and cash equivalents at end of period $ 11 $ 295 $ 63 Exelon Corporation and Subsidiary Companies Schedule I – Condensed Financial Information of Parent (Exelon Corporate) Condensed Balance Sheets December 31, (In millions) 2022 2021 ASSETS Current assets Cash and cash equivalents $ 11 $ 295 Accounts receivable, net Other accounts receivable 358 318 Accounts receivable from affiliates 17 35 Notes receivable from affiliates 182 217 Regulatory assets 154 266 Other 6 41 Total current assets 728 1,172 Property, plant, and equipment, net 44 45 Deferred debits and other assets Regulatory assets 2,650 3,164 Investments in affiliates from continuing operations 35,925 29,563 Investments in affiliates from discontinued operations — 12,333 Deferred income taxes 929 1,351 Non-pension postretirement benefit asset 187 — Notes receivable from affiliates — 319 Other 115 42 Total deferred debits and other assets 39,806 46,772 Total assets $ 40,578 $ 47,989 Exelon Corporation and Subsidiary Companies Schedule I – Condensed Financial Information of Parent (Exelon Corporate) Condensed Balance Sheets December 31, (In millions) 2022 2021 LIABILITIES AND SHAREHOLDERS’ EQUITY Current liabilities Short-term borrowings $ 948 $ 650 Long-term debt due within one year 850 1,150 Accounts payable 188 — Accrued expenses 101 47 Payables to affiliates 360 360 Regulatory liabilities 12 3 Pension obligations 77 49 Other 7 40 Total current liabilities 2,543 2,299 Long-term debt 8,742 6,265 Deferred credits and other liabilities Regulatory liabilities 103 63 Pension obligations 3,896 4,416 Non-pension postretirement benefit obligations — 87 Deferred income taxes 53 362 Other 497 104 Total deferred credits and other liabilities 4,549 5,032 Total liabilities 15,834 13,596 Commitments and contingencies Shareholders’ equity Common stock (No par value, 2,000 shares authorized, 994 shares and 979 shares outstanding as of December 31, 2022 and 2021, respectively) 20,908 20,324 Treasury stock, at cost (2 shares as of December 31, 2022 and 2021) (123) (123) Retained earnings 4,597 16,942 Accumulated other comprehensive loss, net (638) (2,750) Total shareholders’ equity 24,744 34,393 Total liabilities and shareholders’ equity $ 40,578 $ 47,989 Exelon Corporation and Subsidiary Companies Schedule I – Condensed Financial Information of Parent (Exelon Corporate) Notes to Financial Statements Exelon Corporate is a holding company that conducts substantially all of its business operations through its subsidiaries. These condensed financial statements and related footnotes have been prepared in accordance with Rule 12-04, Schedule I of Regulation S-X. These statements should be read in conjunction with the consolidated financial statements, and notes thereto, of Exelon Corporation. As of December 31, 2022 and 2021, Exelon Corporate owned 100% of all of its significant subsidiaries, either directly or indirectly, except for Commonwealth Edison Company (ComEd), of which Exelon Corporate owns more than 99%. As of February 1, 2022, as a result of the completion of the separation, Exelon Corporate no longer retains any equity ownership interest in Generation or Constellation. The separation of Constellation, including Generation and its subsidiaries, meets the criteria for discontinued operations and as such, results of operations are presented as discontinued operations and have been excluded from continuing operations for all periods presented. Accounting rules require that certain BSC costs previously allocated to Generation be presented as part of Exelon’s continuing operations as these costs do not qualify as expenses of the discontinued operations. Comprehensive income and cash flows related to Generation have not been segregated and are included in the Condensed Statements of Operations and Comprehensive Income and Condensed Statements of Cash Flows, respectively, for all periods presented. See Note 2 — Discontinued Operations of the Combined Notes to Consolidated Financial Statements for additional information. Short-Term Borrowings Exelon Corporate meets its short-term liquidity requirements primarily through the issuance of commercial paper. Exelon Corporate had $449 million in outstanding commercial paper borrowings as of December 31, 2022 and no outstanding commercial paper as of December 31, 2021. Short-Term Loan Agreements On March 23, 2017, Exelon Corporate entered into a term loan agreement for $500 million. The loan agreement was renewed on March 14, 2022 and will expire on March 16, 2023. Pursuant to the loan agreement, loans made thereunder bear interest at a variable rate equal to SOFR plus 0.65% and all indebtedness thereunder is unsecured. The loan agreement is reflected in Exelon Corporation's Balance Sheets within Short-term borrowings. On March 31, 2021, Exelon Corporate entered into a 364-day term loan agreement for $150 million with a variable interest rate of LIBOR plus 0.65% and an expiration date of March 30, 2022. Exelon Corporate repaid the term loan on March 30, 2022. In connection with the separation, on January 24, 2022, Exelon Corporate entered into a 364-day term loan agreement for $1.15 billion. The loan agreement was set to expire on January 23, 2023. Pursuant to the loan agreement, loans made thereunder bore interest at a variable rate equal to SOFR plus 0.75% until July 23, 2022 and a rate of SOFR plus 0.975% thereafter. All indebtedness pursuant to the loan agreement was unsecured. On August 11, 2022, Exelon Corporate made a partial repayment of $575 million on the term loan. The remaining $575 million outstanding balance was repaid on October 11, 2022 in conjunction with the $500 million 18-month term loan that was entered into on October 7, 2022. Revolving Credit Agreements As of December 31, 2022, Exelon Corporation had a $900 million aggregate bank commitment under its existing syndicated revolving facility in which $448 million was available to support additional commercial paper as of December 31, 2022. See Note 16 — Debt and Credit Agreements of the Combined Notes to Consolidated Financial Statements for additional information regarding Exelon Corporate’s credit agreement. On February 1, 2022, Exelon Corporate entered into a new 5-year revolving credit facility with an aggregate bank commitment of $900 million at a variable interest rate of SOFR plus 1.275% which replaced its existing $600 million syndicated revolving credit facility. Long-Term Debt The following tables present the outstanding long-term debt for Exelon Corporate as of December 31, 2022 and December 31, 2021: Maturity December 31, Rates 2022 2021 Long-term debt Junior subordinated notes 3.50 % 2022 $ — $ 1,150 Senior unsecured notes (a) 2.75 % - 7.60 % 2025 - 2052 8,139 6,139 Loan agreement 4.95 % - 5.15 % 2023 - 2024 1,350 — Total long-term debt 9,489 7,289 Unamortized debt discount and premium, net (10) (10) Unamortized debt issuance costs (51) (39) Fair value adjustment 164 175 Long-term debt due within one year (b) (850) (1,150) Long-term debt $ 8,742 $ 6,265 __________ (a) Senior unsecured notes included mirror debt that was held on Exelon Corporation's Balance Sheet in 2021. In connection with the separation, on January 31, 2022, Exelon Corporate received cash from Generation of $258 million to settle the intercompany loan. See Note 16 — Debt and Credit Agreements for additional information on the merger debt. (b) In connection with the separation, Exelon Corporate entered into three 18-month term loan agreements. On January 21, 2022, two of the loan agreements were issued for $300 million each with an expiration date of July 21, 2023. On January 24, 2022, the third loan agreement was issued for $250 million with an expiration date of July 24, 2023. Pursuant to the loan agreement, loans made thereunder bear interest at a variable rate equal to SOFR plus 0.65%. The long-term debt maturities for Exelon Corporate for the periods 2023 through 2027 and thereafter are as follows: 2023 $ 850 2024 500 2025 807 2026 750 2027 650 Thereafter 5,932 Total long-term debt $ 9,489 The financial statements of Exelon Corporate include related party transactions as presented in the tables below: For the Years Ended December 31, (In millions) 2022 2021 2020 Operating and maintenance from affiliates: BSC (a) $ 4 $ 14 $ 10 Total operating and maintenance from affiliates: $ 4 $ 14 $ 10 Interest income (expense) from affiliates, net: BSC $ 4 $ — $ 1 EEDC (b) 1 — — Total interest income from affiliates, net: $ 5 $ — $ 1 Equity in earnings (losses) of investments: BSC $ (18) $ (301) $ (273) EEDC (b) 2,482 2,215 1,729 PCI (9) (1) — Exelon InQB8R (4) (7) (1) Other (1) 2 27 Total equity in earnings of investments: $ 2,450 $ 1,908 $ 1,482 Cash contributions received from affiliates $ 2,027 $ 1,842 $ 1,638 As of December 31, (in millions) 2022 2021 Accounts receivable from affiliates (current): BSC (a) $ 3 $ 4 Generation — 13 ComEd 4 5 PECO 2 4 BGE 1 2 PHISCO 7 6 Exelon Enterprises — 1 Total accounts receivable from affiliates (current): $ 17 $ 35 Notes receivable from affiliates (current): BSC (a) $ 138 $ 210 PHI 44 7 Total notes receivable from affiliates (current): $ 182 $ 217 Investments in affiliates from continuing operations: BSC (a) $ 384 $ 146 EEDC (b) 35,092 32,621 PCI 52 62 UII 365 365 Voluntary Employee Beneficiary Association trust 4 3 Exelon Enterprises 3 3 Conectiv 12 — Exelon InQB8R 15 26 Other (d) (2) (3,663) Total investments in affiliates from continuing operations: $ 35,925 $ 29,563 Notes receivable from affiliates (noncurrent): Generation (c) $ — $ 319 Accounts payable to affiliates (current): UII $ 360 $ 360 Total accounts payable to affiliates (current): $ 360 $ 360 __________ (a) Exelon Corporate receives a variety of corporate support services from BSC, including legal, human resources, financial, information technology, and supply management services. All services are provided at cost, including applicable overhead. (b) EEDC consists of ComEd, PECO, BGE, PHI, Pepco, DPL, and ACE. (c) In connection with the debt obligations assumed by Exelon as part of the Constellation merger, Exelon and subsidiaries of Generation (former Constellation subsidiaries) entered into intercompany loan agreements that mirror the terms and amounts of the third-party debt obligations of Exelon, resulting in intercompany notes receivable at Exelon Corporate from Generation. In connection with the separation, on January 31, 2022, Exelon Corporate received cash from Generation of $258 million to settle the intercompany loan. See Schedule 1 - 2. Debit and Credit agreements for additional information on the merger debt. (d) Primarily relates to elimination of affiliate transactions with Generation, primarily related to the Regulatory Agreement Units. See Note 3 — Regulatory Matters and Note 23 — Related Party Transactions of the Combined Notes to Consolidated Financial Statements for additional information. Charitable Contributions In December 2022, Exelon Corporation made an unconditional promise to give $20 million to the Exelon Foundation. The contribution was recorded in Operating and maintenance expense within the Condensed Statements of Operations and Comprehensive Income with the offset in Accrued expenses and Other Deferred credits and other liabilities on the Condensed Balance Sheets.

Schedule II - Valuation and Qua

Schedule II - Valuation and Qualifying Accounts	12 Months Ended
Schedule II - Valuation and Qualifying Accounts	Dec. 31, 2022
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]
Valuation and Qualifying Accounts	Exelon Corporation and Subsidiary Companies Schedule II – Valuation and Qualifying Accounts Column A Column B Column C Column D Column E Additions and adjustments Description Balance at Charged to Charged Deductions Balance at (In millions) For the year ended December 31, 2022 Allowance for credit losses (a) $ 392 $ 174 (b) $ 28 $ 185 (c) $ 409 Deferred tax valuation allowance 37 — 57 — 94 Reserve for obsolete materials 13 8 — 6 15 For the year ended December 31, 2021 Allowance for credit losses (a) $ 405 $ 107 (b) $ — $ 120 (c) $ 392 Deferred tax valuation allowance 4 — 33 (d) — 37 Reserve for obsolete materials 11 5 — 3 13 For the year ended December 31, 2020 Allowance for credit losses (a) $ 213 $ 228 (b) $ 38 $ 74 (c) $ 405 Deferred tax valuation allowance 2 — 2 — 4 Reserve for obsolete materials 12 5 — 6 11 __________ (a) Excludes the noncurrent allowance for credit losses related to PECO’s installment plan receivables of $7 million, $14 million, and $5 million for the years ended December 31, 2022, 2021, and 2020, respectively. (b) The amount charged to costs and expenses includes the amount that was reclassified to regulatory assets/liabilities under different mechanisms applicable to the different jurisdictions the Utility Registrants operate in. (c) Primarily reflects write-offs, net of recoveries of individual accounts receivable. (d) DPL recorded a full valuation allowance against Delaware net operating losses carryforwards due to a change in Delaware tax law. See Note 13 — Income Taxes of the Combined Notes to Consolidated Financial Statements for additional information on the valuation allowance. Commonwealth Edison Company and Subsidiary Companies (2) ComEd (i) Financial Statements (Item 8): Report of Independent Registered Public Accounting Firm dated February 14, 2023 of PricewaterhouseCoopers LLP (PCAOB ID 238) Consolidated Statements of Operations and Comprehensive Income for the Years Ended December 31, 2022, 2021, and 2020 Consolidated Statements of Cash Flows for the Years Ended December 31, 2022, 2021, and 2020 Consolidated Balance Sheets at December 31, 2022 and 2021 Consolidated Statements of Changes in Shareholders’ Equity for the Years Ended December 31, 2022, 2021, and 2020 Notes to Consolidated Financial Statements (ii) Financial Statement Schedule: Schedule II—Valuation and Qualifying Accounts for the Years Ended December 31, 2022, 2021, and 2020 Schedules not included are omitted because of the absence of conditions under which they are required or because the required information is provided in the consolidated financial statements, including the notes thereto Commonwealth Edison Company and Subsidiary Companies Schedule II – Valuation and Qualifying Accounts Column A Column B Column C Column D Column E Additions and adjustments Description Balance at Charged to Charged Deductions Balance at (In millions) For the year ended December 31, 2022 Allowance for credit losses $ 90 $ 24 (a) $ 8 $ 46 (b) $ 76 Reserve for obsolete materials 7 5 — 4 8 For the year ended December 31, 2021 Allowance for credit losses $ 118 $ 18 (a) $ 1 $ 47 (b) $ 90 Reserve for obsolete materials 6 3 — 2 7 For the year ended December 31, 2020 Allowance for credit losses $ 79 $ 54 (a) $ 13 $ 28 (b) $ 118 Reserve for obsolete materials 7 3 — 4 6 __________ (a) ComEd is allowed to recover from or refund to customers the difference between its annual credit loss expense and the amounts collected in rates annually through a rider mechanism. The amount charged to costs and expenses includes the amount that was reclassified to regulatory assets/liabilities under such mechanism. See Note 3 – Regulatory Matters of the Combined Notes to Consolidated Financial Statements for additional information. (b) Write-offs, net of recoveries of individual accounts receivable. PECO Energy Company and Subsidiary Companies (3) PECO (i) Financial Statements (Item 8): Report of Independent Registered Public Accounting Firm dated February 14, 2023 of PricewaterhouseCoopers LLP (PCAOB ID 238) Consolidated Statements of Operations and Comprehensive Income for the Years Ended December 31, 2022, 2021, and 2020 Consolidated Statements of Cash Flows for the Years Ended December 31, 2022, 2021, and 2020 Consolidated Balance Sheets at December 31, 2022 and 2021 Consolidated Statements of Changes in Shareholder's Equity for the Years Ended December 31, 2022, 2021, and 2020 Notes to Consolidated Financial Statements (ii) Financial Statement Schedule: Schedule II—Valuation and Qualifying Accounts for the Years Ended December 31, 2022, 2021, and 2020 Schedules not included are omitted because of the absence of conditions under which they are required or because the required information is provided in the consolidated financial statements, including the notes thereto PECO Energy Company and Subsidiary Companies Schedule II – Valuation and Qualifying Accounts Column A Column B Column C Column D Column E Additions and adjustments Description Balance at Charged to Charged Deductions Balance at (In millions) For the year ended December 31, 2022 Allowance for credit losses (a) $ 112 $ 44 (b) $ 14 $ 56 (c) $ 114 Deferred tax valuation allowance 3 — 4 — 7 Reserve for obsolete materials 2 2 — 1 3 For the year ended December 31, 2021 Allowance for credit losses (a) $ 124 $ 32 (b) $ (6) $ 38 (c) $ 112 Deferred tax valuation allowance 1 — 2 — 3 Reserve for obsolete materials 2 1 — 1 2 For the year ended December 31, 2020 Allowance for credit losses (a) $ 62 $ 76 (b) $ 6 $ 20 (c) $ 124 Deferred tax valuation allowance — — 1 — 1 Reserve for obsolete materials 2 1 — 1 2 __________ (a) Excludes the noncurrent allowance for credit losses related to PECO’s installment plan receivables of $7 million, $14 million, and $5 million for the years ended December 31, 2022, 2021, and 2020, respectively. (b) The amount charged to costs and expenses includes the amount that was reclassified to the COVID-19 regulatory asset. See Note 3 – Regulatory Matters of the Combined Notes to Consolidated Financial Statements for additional information. (c) Write-offs, net of recoveries of individual accounts receivable. Baltimore Gas and Electric Company (4) BGE (i) Financial Statements (Item 8): Report of Independent Registered Public Accounting Firm dated February 14, 2023 of PricewaterhouseCoopers LLP (PCAOB ID 238) Statements of Operations and Comprehensive Income for the Years Ended December 31, 2022, 2021 and 2020 Statements of Cash Flows for the Years Ended December 31, 2022, 2021 and 2020 Balance Sheets at December 31, 2022 and 2021 Statements of Changes in Shareholder's Equity for the Years Ended December 31, 2022, 2021 and 2020 Notes to Financial Statements (ii) Financial Statement Schedule: Schedule II—Valuation and Qualifying Accounts for the Years Ended December 31, 2022, 2021, and 2020 Schedules not included are omitted because of the absence of conditions under which they are required or because the required information is provided in the consolidated financial statements, including the notes thereto Baltimore Gas and Electric Company Schedule II – Valuation and Qualifying Accounts Column A Column B Column C Column D Column E Additions and adjustments Description Balance at Charged to Charged Deductions Balance at (In millions) For the year ended December 31, 2022 Allowance for credit losses $ 47 $ 37 (a) $ 6 $ 26 (b) $ 64 Deferred tax valuation allowance — — 3 — 3 Reserve for obsolete materials 1 1 — — 2 For the year ended December 31, 2021 Allowance for credit losses $ 44 $ 16 (a) $ 3 $ 16 (b) $ 47 Reserve for obsolete materials 1 — — — 1 For the year ended December 31, 2020 Allowance for credit losses $ 17 $ 31 (a) $ 6 $ 10 (b) $ 44 Deferred tax valuation allowance 1 — (1) — — Reserve for obsolete materials 1 — — — 1 __________ (a) The amount charged to costs and expenses includes the amount that was reclassified to regulatory assets/liabilities under different mechanisms as approved by the MDPSC. (b) Write-offs, net of recoveries of individual accounts receivable. Pepco Holdings LLC and Subsidiary Companies (5) PHI (i) Financial Statements (Item 8): Report of Independent Registered Public Accounting Firm dated February 14, 2023 of PricewaterhouseCoopers LLP (PCAOB ID 238) Consolidated Statements of Operations and Comprehensive Income for the Years Ended December 31, 2022, 2021, and 2020 Consolidated Statements of Cash Flows for the Years Ended December 31, 2022, 2021, and 2020 Consolidated Balance Sheets at December 31, 2022 and 2021 Consolidated Statements of Changes in Equity for the Years Ended December 31, 2022, 2021, and 2020 Notes to Consolidated Financial Statements (ii) Financial Statement Schedule: Schedule II—Valuation and Qualifying Accounts for the Years Ended December 31, 2022, 2021, and 2020 Schedules not included are omitted because of the absence of conditions under which they are required or because the required information is provided in the consolidated financial statements, including the notes thereto Pepco Holdings LLC and Subsidiary Companies Schedule II – Valuation and Qualifying Accounts Column A Column B Column C Column D Column E Additions and adjustments Description Balance at Charged to Charged Deductions Balance at (In millions) For the year ended December 31, 2022 Allowance for credit losses $ 143 $ 69 (a) $ — $ 57 (b) $ 155 Deferred tax valuation allowance 31 — 4 — 35 Reserve for obsolete materials 3 — — 1 2 For the year ended December 31, 2021 Allowance for credit losses $ 119 $ 41 (a) $ 2 $ 19 (b) $ 143 Deferred tax valuation allowance — — 31 (c) — 31 Reserve for obsolete materials 2 1 — — 3 For the year ended December 31, 2020 Allowance for credit losses $ 53 $ 69 (a) $ 13 $ 16 (b) $ 119 Reserve for obsolete materials 3 — — 1 2 __________ (a) The amount charged to costs and expenses includes the amount that was reclassified to regulatory assets/liabilities under different mechanisms applicable to the different jurisdictions Pepco, DPL, and ACE operate in. (b) Write-offs, net of recoveries of individual accounts receivable. (c) DPL recorded a full valuation allowance against Delaware net operating losses carryforwards due to a change in Delaware tax law. See Note 13 — Income Taxes of the Combined Notes to Consolidated Financial Statements for additional information on the valuation allowance. Potomac Electric Power Company (6) Pepco (i) Financial Statements (Item 8): Report of Independent Registered Public Accounting Firm dated February 14, 2023 of PricewaterhouseCoopers LLP (PCAOB ID 238) Statements of Operations and Comprehensive Income for the Years Ended December 31, 2022, 2021 and 2020 Statements of Cash Flows for the Years Ended December 31, 2022, 2021 and 2020 Balance Sheets at December 31, 2022 and 2021 Statements of Changes in Shareholder's Equity for the Years Ended December 31, 2022, 2021 and 2020 Notes to Financial Statements (ii) Financial Statement Schedule: Schedule II—Valuation and Qualifying Accounts for the Years Ended December 31, 2022, 2021, and 2020 Schedules not included are omitted because of the absence of conditions under which they are required or because the required information is provided in the consolidated financial statements, including the notes thereto Potomac Electric Power Company Schedule II – Valuation and Qualifying Accounts Column A Column B Column C Column D Column E Additions and adjustments Description Balance at Charged to Charged Deductions Balance at (In millions) For the year ended December 31, 2022 Allowance for credit losses $ 53 $ 36 (a) $ 4 $ 21 (b) $ 72 Reserve for obsolete materials 1 — — — 1 For the year ended December 31, 2021 Allowance for credit losses $ 45 $ 14 (a) $ 2 $ 8 (b) $ 53 Reserve for obsolete materials 1 — — — 1 For the year ended December 31, 2020 Allowance for credit losses $ 20 $ 25 (a) $ 5 $ 5 (b) $ 45 Reserve for obsolete materials 1 — — — 1 __________ (a) The amount charged to costs and expenses includes the amount that was reclassified to regulatory assets/liabilities under different mechanisms as approved by the DCPSC and MDPSC. (b) Write-offs, net of recoveries of individual accounts receivable. Delmarva Power & Light Company (7) DPL (i) Financial Statements (Item 8): Report of Independent Registered Public Accounting Firm dated February 14, 2023 of PricewaterhouseCoopers LLP (PCAOB ID 238) Statements of Operations and Comprehensive Income for the Years Ended December 31, 2022, 2021 and 2020 Statements of Cash Flows for the Years Ended December 31, 2022, 2021 and 2020 Balance Sheets at December 31, 2022 and 2021 Statements of Changes in Shareholder's Equity for the Years Ended December 31, 2022, 2021 and 2020 Notes to Financial Statements (ii) Financial Statement Schedule: Schedule II—Valuation and Qualifying Accounts for the Years Ended December 31, 2022, 2021, and 2020 Schedules not included are omitted because of the absence of conditions under which they are required or because the required information is provided in the consolidated financial statements, including the notes thereto Delmarva Power & Light Company Schedule II – Valuation and Qualifying Accounts Column A Column B Column C Column D Column E Additions and adjustments Description Balance at Charged to Charged Deductions Balance at (In millions) For the year ended December 31, 2022 Allowance for credit losses $ 26 $ 13 (a) $ (2) $ 9 (b) $ 28 Deferred tax valuation allowance 31 — 1 — 32 For the year ended December 31, 2021 Allowance for credit losses $ 31 $ 6 (a) $ (1) $ 10 (b) $ 26 Deferred tax valuation allowance — — 31 (c) — 31 For the year ended December 31, 2020 Allowance for credit losses $ 15 $ 16 (a) $ 4 $ 4 (b) $ 31 __________ (a) The amount charged to costs and expenses includes the amount that was reclassified to regulatory assets/liabilities under different mechanisms as approved by the DEPSC and MDPSC. (b) Write-offs, net of recoveries of individual accounts receivable. (c) DPL recorded a full valuation allowance against Delaware net operating losses carryforwards due to a change in Delaware tax law. See Note 13 — Income Taxes of the Combined Notes to Consolidated Financial Statements for additional information on the valuation allowance. Atlantic City Electric Company and Subsidiary Company (8) ACE (i) Financial Statements (Item 8): Report of Independent Registered Public Accounting Firm dated February 14, 2023 of PricewaterhouseCoopers LLP (PCAOB ID 238) Consolidated Statements of Operations and Comprehensive Income for the Years Ended December 31, 2022, 2021, and 2020 Consolidated Statements of Cash Flows for the Years Ended December 31, 2022, 2021, and 2020 Consolidated Balance Sheets at December 31, 2022 and 2021 Consolidated Statements of Changes in Shareholder's Equity for the Years Ended December 31, 2022, 2021, and 2020 Notes to Consolidated Financial Statements (ii) Financial Statement Schedule: Schedule II—Valuation and Qualifying Accounts for the Years Ended December 31, 2022, 2021, and 2020 Schedules not included are omitted because of the absence of conditions under which they are required or because the required information is provided in the consolidated financial statements, including the notes thereto Atlantic City Electric Company and Subsidiary Company Schedule II – Valuation and Qualifying Accounts Column A Column B Column C Column D Column E Additions and adjustments Description Balance at Charged to Charged Deductions Balance at (In millions) For the year ended December 31, 2022 Allowance for credit losses $ 64 $ 20 (a) $ (2) $ 27 (b) $ 55 Reserve for obsolete materials 1 — — — 1 For the year ended December 31, 2021 Allowance for credit losses $ 43 $ 21 (a) $ 1 $ 1 (b) $ 64 Reserve for obsolete materials — 1 — — 1 For the year ended December 31, 2020 Allowance for credit losses $ 18 $ 28 (a) $ 4 $ 7 (b) $ 43 Reserve for obsolete materials 1 — — 1 — __________ (a) ACE is allowed to recover from or refund to customers the difference between its annual credit loss expense and the amounts collected in rates annually through the Societal Benefits Charge. The amount charged to costs and expenses includes the amount that was reclassified to regulatory assets/liabilities under such mechanism. See Note 3 – Regulatory Matters of the Combined Notes to Consolidated Financial Statements for additional information. (b) Write-offs, net of recoveries of individual accounts receivable.

Significant Accounting Polici_2

Significant Accounting Policies (Policies)	12 Months Ended
Significant Accounting Policies (Policies)	Dec. 31, 2022
Accounting Policies [Abstract]
Business Description and Basis of Presentation (All Registrants)	Description of Business (All Registrants) Exelon is a utility services holding company engaged in the energy distribution and transmission businesses through ComEd, PECO, BGE, Pepco, DPL, and ACE. On February 21, 2021, Exelon’s Board of Directors approved a plan to separate the Utility Registrants and Generation. The separation was completed on February 1, 2022, creating two publicly traded companies, Exelon and Constellation. See Note 2 — Discontinued Operations for additional information. Name of Registrant Business Service Territories Commonwealth Edison Company Purchase and regulated retail sale of electricity Northern Illinois, including the City of Chicago Transmission and distribution of electricity to retail customers PECO Energy Company Purchase and regulated retail sale of electricity and natural gas Southeastern Pennsylvania, including the City of Philadelphia (electricity) Transmission and distribution of electricity and distribution of natural gas to retail customers Pennsylvania counties surrounding the City of Philadelphia (natural gas) Baltimore Gas and Electric Company Purchase and regulated retail sale of electricity and natural gas Central Maryland, including the City of Baltimore (electricity and natural gas) Transmission and distribution of electricity and distribution of natural gas to retail customers Pepco Holdings LLC Utility services holding company engaged, through its reportable segments Pepco, DPL, and ACE Service Territories of Pepco, DPL, and ACE Potomac Electric Power Company Purchase and regulated retail sale of electricity District of Columbia, and major portions of Montgomery and Prince George’s Counties, Maryland. Transmission and distribution of electricity to retail customers Delmarva Power & Light Company Purchase and regulated retail sale of electricity and natural gas Portions of Delaware and Maryland (electricity) Transmission and distribution of electricity and distribution of natural gas to retail customers Portions of New Castle County, Delaware (natural gas) Atlantic City Electric Company Purchase and regulated retail sale of electricity Portions of Southern New Jersey Transmission and distribution of electricity to retail customers Basis of Presentation (All Registrants) This is a combined annual report of all Registrants. The Notes to the Consolidated Financial Statements apply to the Registrants as indicated parenthetically next to each corresponding disclosure. When appropriate, the Registrants are named specifically for their related activities and disclosures. Each of the Registrant’s Consolidated Financial Statements includes the accounts of its subsidiaries. All intercompany transactions have been eliminated, except for the historical transactions between the Utility Registrants and Generation for the purposes of presenting discontinued operations in all periods presented in the Consolidated Statements of Operations and Comprehensive Income. Through its business services subsidiary, BSC, Exelon provides its subsidiaries with a variety of support services at cost, including legal, human resources, financial, information technology, and supply management services. PHI also has a business services subsidiary, PHISCO, which provides a variety of support services at cost, including legal, finance, engineering, customer operations, distribution and transmission planning, asset management, system operations, and power procurement, to PHI operating companies. The costs of BSC and PHISCO are directly charged or allocated to the applicable subsidiaries. The results of Exelon’s corporate operations are presented as “Other” within the consolidated financial statements and include intercompany eliminations unless otherwise disclosed. As of December 31, 2022 and 2021, Exelon owned 100% of PECO, BGE, and PHI and more than 99% of ComEd. PHI owns 100% of Pepco, DPL, and ACE. As of December 31, 2021, Exelon owned 100% of Generation. As of February 1, 2022, as a result of the completion of the separation, Exelon no longer owns any interest in Generation. The separation of Constellation, including Generation and its subsidiaries, meets the criteria for discontinued operations and as such, its results of operations are presented as discontinued operations and have been excluded from continuing operations for all periods presented. Accounting rules require that certain BSC costs previously allocated to Generation be presented as part of Exelon’s continuing operations as these costs do not qualify as expenses of the discontinued operations. Comprehensive income, shareholders' equity, and cash flows related to Generation have not been segregated and are included in the Consolidated Statements of Operations and Comprehensive Income, Consolidated Statements of Changes in Shareholders’ Equity, and Consolidated Statements of Cash Flows, respectively, for all periods presented. See Note 2 — Discontinued Operations for additional information. The accompanying consolidated financial statements have been prepared in accordance with GAAP for annual financial statements and in accordance with the instructions to Form 10-K and Regulation S-X promulgated by the SEC.
Use Of Estimates (All Registrants)	Use of Estimates (All Registrants)The preparation of financial statements of each of the Registrants in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Areas in which significant estimates have been made include, but are not limited to, the accounting for pension and OPEB, unbilled energy revenues, allowance for credit losses, inventory reserves, goodwill and long-lived asset impairment assessments, derivative instruments, unamortized energy contracts, fixed asset depreciation, environmental costs and other loss contingencies, AROs, and taxes. Actual results could differ from those estimates.
Reclassification, Comparability Adjustment	Prior Period Adjustments and Reclassifications (Exelon, PHI, ACE) In the first quarter of 2022, management identified an error related to an overstatement of the regulatory liability associated with ACE’s mechanism to recover the cost of Transition Bonds issued in 2002 and 2003 by ACE Funding. Management has concluded that the error was not material to previously issued financial statements for Exelon, PHI or ACE. The error was corrected through a revision to ACE’s financial statements contained herein. The impact of the error correction was an $8 million increase to ACE’s opening Retained earnings as of January 1, 2021 with a corresponding reduction to Regulatory liabilities of $11 million and an increase to Deferred income taxes and unamortized investment tax credits of $3 million. The impact of the error to ACE’s Total operating revenues and Net income was less than $1 million for the year ended December 31, 2021. The error did not impact net cash flows provided by operating activities, net cash flows used in investing activities or net cash flows provided by financing activities for the year ended December 31, 2021. The error was corrected in the Exelon and PHI financial statements for the year ended December 31, 2022 as it was not material, resulting in an increase to Net income of $8 million.
Accounting for the Effects of Regulation (All Registrants)	Regulatory Accounting (All Registrants) For their regulated electric and gas operations, the Registrants reflect the effects of cost-based rate regulation in their financial statements, which is required for entities with regulated operations that meet the following criteria: (1) rates are established or approved by a third-party regulator; (2) rates are designed to recover the entities’ cost of providing services or products; and (3) there is a reasonable expectation that rates designed to recover costs can be charged to and collected from customers. The Registrants account for their regulated operations in accordance with regulatory and legislative guidance from the regulatory authorities having jurisdiction, principally the ICC, PAPUC, MDPSC, DCPSC, DEPSC, and NJBPU, under state public utility laws and the FERC under various Federal laws. Regulatory assets and liabilities are amortized and the related expense or revenue is recognized in the Consolidated Statements of Operations consistent with the recovery or refund included in customer rates. The Registrants' regulatory assets and liabilities as of the balance sheet date are probable of being recovered or settled in future rates. If a separable portion of the Registrants' business was no longer able to meet the criteria discussed above, the affected entities would be required to eliminate from their consolidated financial statements the effects of regulation for that portion, which could have a material impact on their financial statements. See Note 3 — Regulatory Matters for additional information. With the exception of income tax-related regulatory assets and liabilities, the Registrants classify regulatory assets and liabilities with a recovery or settlement period greater than one year as both current and noncurrent in their Consolidated Balance Sheets, with the current portion representing the amount expected to be recovered from or refunded to customers over the next twelve-month period as of the balance sheet date. Income tax-related regulatory assets and liabilities are classified entirely as noncurrent in the Registrants’ Consolidated Balance Sheets to align with the classification of the related deferred income tax balances. The Registrants treat the impacts of a final rate order received after the balance sheet date but prior to the issuance of the financial statements as a non-recognized subsequent event, as the receipt of a final rate order is a separate and distinct event that has future impacts on the parties affected by the order.
Revenues (All Registrants)	Revenues (All Registrants) Operating Revenues. The Registrants’ operating revenues generally consist of revenues from contracts with customers involving the sale and delivery of power and natural gas and utility revenues from ARP. The Registrants recognize revenue from contracts with customers to depict the transfer of goods or services to customers in an amount that the entities expect to be entitled to in exchange for those goods or services. The primary sources of revenue include regulated electric and natural gas tariff sales, distribution, and transmission services. At the end of each month, the Registrants accrue an estimate for the unbilled amount of energy delivered or services provided to customers. ComEd records ARP revenue for its best estimate of the electric distribution, energy efficiency, and transmission revenue impacts resulting from future changes in rates that ComEd believes are probable of approval by the ICC and FERC in accordance with its formula rate mechanisms. BGE, Pepco, DPL, and ACE record ARP revenue for their best estimate of the electric and natural gas distribution revenue impacts resulting from future changes in rates that they believe are probable of approval by the MDPSC, DCPSC, and/or NJBPU in accordance with their revenue decoupling mechanisms. PECO, BGE, Pepco, DPL, and ACE record ARP revenue for their best estimate of the transmission revenue impacts resulting from future changes in rates that they believe are probable of approval by FERC in accordance with their formula rate mechanisms. The companies recognize all ARP revenues that will be collected within 24 months of the end of the annual period in which they are recorded. See Note 3 — Regulatory Matters for additional information.
Taxes Directly Imposed on Revenue-Producing Transactions	Taxes Directly Imposed on Revenue-Producing Transactions. The Registrants collect certain taxes from customers such as sales and gross receipts taxes, along with other taxes, surcharges, and fees, that are levied by state or local governments on the sale or distribution of electricity and gas. Some of these taxes are imposed on the customer, but paid by the Registrants, while others are imposed on the Registrants. Where these taxes are imposed on the customer, such as sales taxes, they are reported on a net basis with no impact to the Consolidated Statements of Operations and Comprehensive Income. However, where these taxes are imposed on the Registrants, such as gross receipts taxes or other surcharges or fees, they are reported on a gross basis. Accordingly, revenues are recognized for the taxes collected from customers along with an offsetting expense. Se e Note 22 — Supplemental Financial Information for taxes that are presented on a gross basis.
Leases (All Registrants)	Leases (All Registrants) The Registrants recognize a ROU asset and lease liability for operating and finance leases with a term of greater than one year. Operating lease ROU assets are included in Other deferred debits and other assets and operating lease liabilities are included in Other current liabilities and Other deferred credits and other liabilities on the Consolidated Balance Sheets. Finance lease ROU assets are included in Plant, property, and equipment, net and finance lease liabilities are included in Long-term debt due within one year and Long-term debt on the Consolidated Balance Sheets. The ROU asset is measured as the sum of (1) the present value of all remaining fixed and in-substance fixed payments using the rate implicit in the lease whenever that is readily determinable or each Registrant’s incremental borrowing rate, (2) any lease payments made at or before the commencement date (less any lease incentives received), and (3) any initial direct costs incurred. The lease liability is measured the same as the ROU asset, but excludes any payments made before the commencement date and initial direct costs incurred. Lease terms include options to extend or terminate the lease if it is reasonably certain they will be exercised. The Registrants include non-lease components for most asset classes, which are service-related costs that are not integral to the use of the asset, in the measurement of the ROU asset and lease liability. Expense for operating leases and leases with a term of one year or less is recognized on a straight-line basis over the term of the lease, unless another systematic and rational basis is more representative of the derivation of benefit from use of the leased property. Variable lease payments are recognized in the period in which the related obligation is incurred. Operating lease expense, finance lease expense, and variable lease payments are primarily recorded to Operating and maintenance expense on the Registrants’ Statements of Operations and Comprehensive Income. Income from operating leases, including subleases, is recognized on a straight-line basis over the term of the lease, unless another systematic and rational basis is more representative of the pattern in which income is earned over the term of the lease. Variable lease income is recognized in the period in which the related obligation is performed. Operating lease income and variable lease income are recorded to Operating revenues on the Registrants’ Statements of Operations and Comprehensive Income. The Registrants’ operating and finance leases consist primarily of real estate including office buildings and vehicles and equipment. The Registrants account for land right arrangements that provide for exclusive use as leases while shared use land arrangements are generally not leases. The Registrants do not account for secondary use pole attachments as leases. See Note 10 — Leases for additional information.
Income Taxes (All Registrants)	Income Taxes (All Registrants) Deferred federal and state income taxes are recorded on significant temporary differences between the book and tax basis of assets and liabilities and for tax benefits carried forward. Investment tax credits have been deferred in the Registrants’ Consolidated Balance Sheets and are recognized in book income over the life of the related property. The Registrants account for uncertain income tax positions using a benefit recognition model with a two-step approach; a more-likely-than-not recognition criterion; and a measurement approach that measures the position as the largest amount of tax benefit that is greater than 50% likely of being realized upon ultimate settlement. If it is not more-likely-than-not that the benefit of the tax position will be sustained on its technical merits, no benefit is recorded. Uncertain tax positions that relate only to timing of when an item is included on a tax return are considered to have met the recognition threshold. The Registrants recognize accrued interest related to unrecognized tax benefits in Interest expense, net or Other, net (interest income) and recognize penalties related to unrecognized tax benefits in Other, net in their Consolidated Statements of Operations and Comprehensive Income.
Cash and Cash Equivalents (All Registrants)	Cash and Cash Equivalents (All Registrants) The Registrants consider investments purchased with an original maturity of three months or less to be cash equivalents. Restricted Cash and Cash Equivalents (All Registrants) Restricted cash and cash equivalents represent funds that are restricted to satisfy designated current liabilities. As of December 31, 2022 and 2021, the Registrants' restricted cash and cash equivalents primarily represented the following items: Registrant Description Exelon Payment of medical, dental, vision, and long-term disability benefits, in addition to the items listed below for the Utility Registrants. ComEd Collateral held from suppliers associated with energy and REC procurement contracts, any over-recovered RPS costs and alternative compliance payments received from RES pursuant to FEJA, and costs for the remediation of an MGP site. PECO Proceeds from the sales of assets that were subject to PECO’s mortgage indenture. BGE Proceeds from the loan program for the completion of certain energy efficiency measures and collateral held from energy suppliers. PHI (a) Payment of merger commitments, collateral held from its energy suppliers associated with procurement contracts, and repayment of Transition Bonds Pepco Payment of merger commitments and collateral held from energy suppliers. DPL Collateral held from energy suppliers. ACE (a) Repayment of Transition Bonds __________ (a) As of December 31, 2021, the Transition Bonds were fully redeemed. Restricted cash and cash equivalents not available to satisfy current liabilities are classified as noncurrent assets. As of December 31, 2022 and 2021, the Registrants' noncurrent restricted cash and cash equivalents primarily represented ComEd’s over-recovered RPS costs and alternative compliance payments received from RES pursuant to FEJA and costs for the remediation of an MGP site. See Note 16 — Debt and Credit Agreements and Note 22 — Supplemental Financial Information for additional information.
Allowance for Credit Losses on Accounts Receivables (All Registrants)	Allowance for Credit Losses on Accounts Receivables (All Registrants) The allowance for credit losses reflects the Registrants’ best estimates of losses on the customers' accounts receivable balances based on historical experience, current information, and reasonable and supportable forecasts. The allowance for credit losses is developed by applying loss rates for each Utility Registrant, based on historical loss experience, current conditions, and forward-looking risk factors, to the outstanding receivable balance by customer risk segment. Utility Registrants' customer accounts are written off consistent with approved regulatory requirements. Adjustments to the allowance for credit losses are primarily recorded to Operating and maintenance expense on the Registrants' Consolidated Statements of Operations and Comprehensive Income or Regulatory assets and liabilities on the Registrants' Consolidated Balance Sheets. See Note 3 - Regulatory Matters for additional information regarding the regulatory recovery of credit losses on customer accounts receivable. The Registrants have certain non-customer receivables in Other deferred debits and other assets which primarily are with governmental agencies and other high-quality counterparties with no history of default. As such, the allowance for credit losses related to these receivables is not material. The Registrants monitor these balances and will record an allowance if there are indicators of a decline in credit quality. See Note 6 — Accounts Receivable for additional information.
Inventories (All Registrants)	Inventories (All Registrants) Inventory is recorded at the lower of weighted average cost or net realizable value. Provisions are recorded for excess and obsolete inventory. Fossil fuel and materials and supplies are generally included in inventory when purchased. Fossil fuel is expensed to Purchased power and fuel expense when used or sold. Materials and supplies generally includes transmission and distribution materials and are expensed to Operating and maintenance or capitalized to Property, plant, and equipment, as appropriate, when installed or used.
Property Plant And Equipment (All Registrants)	Property, Plant, and Equipment (All Registrants) Property, plant, and equipment is recorded at original cost. Original cost includes construction-related direct labor and material costs and indirect construction costs including labor and related costs of departments associated with supporting construction activities. When appropriate, original cost also includes AFUDC for regulated property at the Utility Registrants. The cost of repairs and maintenance and minor replacements of property is charged to Operating and maintenance expense as incurred. Third parties reimburse the Utility Registrants for all or a portion of expenditures for certain capital projects. Such contributions in aid of construction costs (CIAC) are recorded as a reduction to Property, plant, and equipment, net. Upon retirement, the cost of property, net of salvage, is charged to accumulated depreciation consistent with the composite and group methods of depreciation. Depreciation expense at ComEd, BGE, Pepco, DPL, and ACE includes the estimated cost of dismantling and removing plant from service upon retirement. Actual incurred removal costs are applied against a related regulatory liability or recorded to a regulatory asset if in excess of previously collected removal costs. PECO’s removal costs are capitalized to accumulated depreciation when incurred and recorded to depreciation expense over the life of the new asset constructed consistent with PECO’s regulatory recovery method. Capitalized Software. Certain costs, such as design, coding, and testing incurred during the application development stage of software projects that are internally developed or purchased for operational use are capitalized within Property, plant, and equipment. Similar costs incurred for cloud-based solutions treated as service arrangements are capitalized within Other Current Assets and Deferred Debits and Other Assets. Such capitalized amounts are amortized ratably over the expected lives of the projects when they become operational, generally not to exceed five years. Certain other capitalized software costs are being amortized over longer lives based on the expected life or pursuant to prescribed regulatory requirements. AFUDC. AFUDC is the cost, during the period of construction, of debt and equity funds used to finance construction projects for regulated operations. AFUDC is recorded to construction work in progress and as a non-cash credit to an allowance that is included in interest expense for debt-related funds and other income and deductions for equity-related funds. The rates used for capitalizing AFUDC are computed under a method prescribed by regulatory authorities. See Note 7 — Property, Plant, and Equipment, Note 8 — Jointly Owned Electric Utility Plant and Note 22 — Supplemental Financial Information for additional information.
Depreciation and Amortization (All Registrants)	Depreciation and Amortization (All Registrants) Depreciation is generally recorded over the estimated service lives of property, plant, and equipment on a straight-line basis using the group or composite methods of depreciation. The group approach is typically for groups of similar assets that have approximately the same useful lives and the composite approach is used for dissimilar assets that have different lives. Under both methods, a reporting entity depreciates the assets over the average life of the assets in the group. ComEd, BGE, Pepco, DPL, and ACE's depreciation expense includes the estimated cost of dismantling and removing plant from service upon retirement, which is consistent with each utility's regulatory recovery method. PECO's removal costs are capitalized to accumulated depreciation when incurred and recorded to depreciation expense over the life of the new asset constructed consistent with PECO's regulatory recovery method. The estimated service lives for the Registrants are based on a combination of depreciation studies and historical retirements. See Note 7 — Property, Plant, and Equipment for additional information regarding depreciation. Amortization of regulatory assets and liabilities are recorded over the recovery or refund period specified in the related legislation or regulatory order or agreement. When the recovery or refund period is less than one year, amortization is recorded to the line item in which the deferred cost or income would have originally been recorded in the Registrants’ Consolidated Statements of Operations and Comprehensive Income. Amortization of ComEd’s electric distribution and energy efficiency formula rate regulatory assets and the Utility Registrants' transmission formula rate regulatory assets is recorded to Operating revenues. Amortization of income tax related regulatory assets and liabilities is generally recorded to Income tax expense. Except for the regulatory assets and liabilities discussed above, amortization is generally recorded to Depreciation and amortization in the Registrants’ Consolidated Statements of Operations and Comprehensive Income when the recovery period is more than one year. See Note 3 — Regulatory Matters and Note 22 — Supplemental Financial Information for additional information regarding the amortization of the Registrants' regulatory assets.
Asset Retirement Obligations (All Registrants)	Asset Retirement Obligations (All Registrants) The Registrants estimate and recognize a liability for their legal obligation to perform asset retirement activities even though the timing and/or methods of settlement may be conditional on future events. The Registrants update their AROs either annually or on a rotational basis at least once every three years, based on a risk profile, unless circumstances warrant more frequent updates. The updates factor in new cost estimates, credit-adjusted, risk-free rates (CARFR) and escalation rates, and the timing of cash flows. AROs are accreted throughout each year to reflect the time value of money for these present value obligations through an increase to regulatory assets. See Note 9 — Asset Retirement Obligations for additional information.
Guarantees (All Registrants)	Guarantees (All Registrants) If necessary, the Registrants recognize a liability at the time of issuance of a guarantee for the fair value of the obligations they have undertaken by issuing the guarantee. The liability is reduced or eliminated as the Registrants are released from risk under the guarantee. Depending on the nature of the guarantee, the release from risk of the Registrant may be recognized only upon the expiration or settlement of the guarantee or by a systematic and rational amortization method over the term of the guarantee. See Note 18 — Commitments and Contingencies for additional information.
Asset Impairments	Asset Impairments Long-Lived Assets (All Registrants). The Registrants evaluate the carrying value of long-lived assets for recoverability whenever events or changes in circumstances indicate that the carrying value of those assets may not be recoverable. Indicators of impairment may include specific regulatory disallowance, abandonment, or plans to dispose of a long-lived asset significantly before the end of its useful life. When the estimated undiscounted future cash flows attributable to the long-lived asset may not be recoverable, the amount of the impairment loss is determined by measuring the excess of the carrying amount of the long-lived asset over its fair value. Goodwill (Exelon, ComEd, and PHI). Goodwill represents the excess of the purchase price paid over the estimated fair value of the net assets acquired and liabilities assumed in the acquisition of a business. Goodwill is not amortized but is assessed for impairment at least annually or on an interim basis if an event occurs or circumstances change that would more likely than not reduce the fair value of a reporting unit below its carrying value. See Note 12 — Intangible Assets for additional information.
Derivatives Financial Instruments (All Registrants)	Derivative Financial Instruments (All Registrants) Derivatives are recognized on the balance sheet at their fair value unless they qualify for certain exceptions, including NPNS. For derivatives that qualify and are designated as cash flow hedges, changes in fair value each period are initially recorded in AOCI and recognized in earnings when the underlying hedged transaction affects earnings. Amounts recognized in earnings are recorded in Interest expense, net on the Consolidated Statement of Operations and Comprehensive Income based on the activity the transaction is economically hedging. Cash inflows and outflows related to derivative instruments designated as cash flow hedges are included as a component of operating, investing, or financing cash flows in the Consolidated Statements of Cash Flows, depending on the nature of each transaction. For derivatives intended to serve as economic hedges, which are not designated for hedge accounting, changes in fair value each period are recognized in earnings or as a regulatory asset or liability each period. Amounts recognized in earnings are recorded in Electric operating revenues, Purchased power and fuel, or Interest expense in the Consolidated Statements of Operations and Comprehensive Income based on the activity the transaction is economically hedging. Changes in fair value are also recorded as a regulatory asset or liability when there is an ability to recover or return the associated costs or benefits in accordance with regulatory requirements. Cash inflows and outflows related to derivative instruments are included as a component of operating, investing, or financing cash flows in the Consolidated Statements of Cash Flows, depending on the
Retirement Benefits (All Registrants)	Retirement Benefits (All Registrants) Exelon sponsors defined benefit pension plans and OPEB plans for substantially all current employees. The plan obligations and costs of providing benefits under these plans are measured as of December 31. The measurement involves various factors, assumptions, and accounting elections. The impact of assumption changes or experience different from that assumed on pension and OPEB obligations is recognized over time rather than immediately recognized in the Consolidated Statements of Operations and Comprehensive Income. Gains or losses in excess of the greater of ten percent of the projected benefit obligation or the MRV of plan assets are amortized over the expected average remaining service period of plan participants. See Note 14 — Retirement Benefits for additional information.

Discontinued Operations (Tables

Discontinued Operations (Tables) - Exelon Generation Co L L C [Member]	12 Months Ended
	Dec. 31, 2022
Business Dispositions [Line Items]
Discontinued Operations - Income Statement	The following table presents the results of Constellation that have been reclassified from continuing operations and included in discontinued operations within Exelon’s Consolidated Statements of Operations and Comprehensive Income for the years ended December 31, 2022, 2021, and 2020. These results are primarily Generation, which is comprised of Exelon’s Mid-Atlantic, Midwest, New York, ERCOT, and Other Power Regions reportable segments, and include the impact of transaction costs, certain BSC costs, including any transition costs, that were historically allocated and directly attributable to Generation, transactions between Generation and the Utility Registrants, and tax-related adjustments. Transaction costs include costs for external bankers, accountants, appraisers, lawyers, external counsels and other advisors, among others, who were involved in the negotiation, appraisal, due diligence and regulatory approval of the separation. Transition costs are primarily employee-related costs such as recruitment expenses, costs to establish certain stand-alone functions and information technology systems, professional services fees, and other separation-related costs during the transition to separate Generation. For the purposes of reporting discontinued operations, these results also include transactions between Generation and the Utility Registrants that were historically eliminated within Exelon’s Consolidated Statements of Operations, as these transactions will be ongoing after the separation. Certain BSC costs that were historically allocated to Generation are presented as part of continuing operations in Exelon’s Consolidated Statements of Operations as these costs do not qualify as expenses of the discontinued operations per the accounting rules. For the Years Ended December 31, 2022 2021 2020 Operating revenues Competitive business revenues $ 1,855 $ 18,466 $ 16,399 Competitive business revenues from affiliates 161 1,189 1,206 Total operating revenues 2,016 19,655 17,605 Operating expenses Competitive businesses purchased power and fuel 1,138 12,163 9,585 Operating and maintenance (a) 371 4,174 4,794 Depreciation and amortization 94 3,003 2,123 Taxes other than income taxes 44 475 482 Total operating expenses 1,647 19,815 16,984 Gain on sales of assets and businesses 10 201 11 Operating income 379 41 632 Other income and (deductions) Interest expense, net (20) (282) (328) Other, net (281) 795 937 Total other (deductions) and income (301) 513 609 Income before income taxes 78 554 1,241 Income taxes (40) 332 380 Equity in losses of unconsolidated affiliates (1) (9) (6) Net income 117 213 855 Net income (loss) attributable to noncontrolling interests 1 123 (9) Net income from discontinued operations $ 116 $ 90 $ 864 __________ (a) Includes transaction and transition costs related to the separation of $52 million and $43 million for the years ended December 31, 2022 and 2021, respectively. There were no separation related costs incurred in 2020. See discussion above for additional information.
Discontinued Operations - Balance Sheet	The following table presents the assets and liabilities of discontinued operations in Exelon’s Consolidated Balance Sheets as of December 31, 2021. December 31, 2021 ASSETS Current assets Cash and cash equivalents $ 510 Restricted cash and cash equivalents 72 Accounts receivable Customer accounts receivable 1,724 Customer allowance for credit losses (55) Customer accounts receivable, net 1,669 Other accounts receivable 596 Other allowance for credit losses (4) Other accounts receivable, net 592 Mark-to-market derivative assets 2,169 Inventories, net Fossil fuel and emission allowances 284 Materials and supplies 1,004 Renewable energy credits 529 Assets held for sale 13 Other 993 Total current assets of discontinued operations 7,835 Property, plant, and equipment (net of accumulated depreciation and amortization of $15,888) 19,661 Deferred debits and other assets Nuclear decommissioning trust funds 15,938 Investments 193 Mark-to-market derivative assets 949 Other 1,768 Total property, plant, and equipment, deferred debits, and other assets of discontinued operations 38,509 Total assets of discontinued operations $ 46,344 December 31, 2021 LIABILITIES AND SHAREHOLDERS’ EQUITY Current liabilities Short-term borrowings $ 2,082 Long-term debt due within one year 1,220 Accounts payable 1,757 Accrued expenses 818 Mark-to-market derivative liabilities 981 Renewable energy credit obligation 779 Liabilities held for sale 3 Other 300 Total current liabilities of discontinued operations 7,940 Long-term debt 4,575 Deferred credits and other liabilities Deferred income taxes and unamortized investment tax credits 3,583 Asset retirement obligations 12,819 Pension obligations 939 Non-pension postretirement benefit obligations 876 Spent nuclear fuel obligation 1,210 Mark-to-market derivative liabilities 513 Other 1,161 Total long-term debt, deferred credits, and other liabilities of discontinued operations 25,676 Total liabilities of discontinued operations $ 33,616
Discontinued Operations - Cash Flows	The following table presents selected financial information regarding cash flows of the discontinued operations that are included within Exelon’s Consolidated Statements of Cash Flows for the years ended December 31, 2022, 2021, and 2020. For the Years Ended December 31, 2022 2021 2020 Non-cash items included in net income from discontinued operations: Depreciation, amortization, and accretion, including nuclear fuel and energy contract amortization $ 207 $ 4,540 $ 3,636 Asset impairments — 545 563 Loss (gain) on sales of assets and businesses 9 (201) (11) Deferred income taxes and amortization of investment tax credits (143) (224) 94 Net fair value changes related to derivatives (59) (568) (270) Net realized and unrealized losses (gains) on NDT fund investments 205 (586) (461) Net unrealized losses (gains) on equity investments 16 160 (186) Other decommissioning-related activity 36 (946) (659) Cash flows from investing activities: Capital expenditures (227) (1,341) (1,759) Collection of DPP 169 3,902 3,771 Supplemental cash flow information: (Decrease) increase in capital expenditures not paid (128) 96 (88) Increase in DPP 348 3,652 4,441 Increase in PP&E related to ARO update 335 618 850

Regulatory Matters (Tables)

Regulatory Matters (Tables)	12 Months Ended
Regulatory Matters (Tables)	Dec. 31, 2022
Public Utilities, General Disclosures [Line Items]
Public Utilities Distribution Rate Cases [Table Text Block]	The following tables show the completed and pending distribution base rate case proceedings in 2022. Completed Distribution Base Rate Case Proceedings Registrant/Jurisdiction Filing Date Service Requested Revenue Requirement Increase Approved Revenue Requirement Increase Approved ROE Approval Date Rate Effective Date ComEd - Illinois (a) April 16, 2021 Electric $ 51 $ 46 7.36% December 1, 2021 January 1, 2022 April 15, 2022 Electric 199 199 7.85% November 17, 2022 January 1, 2023 PECO - Pennsylvania March 30, 2021 Electric 246 132 N/A (b) November 18, 2021 January 1, 2022 March 31, 2022 Natural Gas 82 55 October 27, 2022 January 1, 2023 BGE - Maryland (c) May 15, 2020 (amended September 11, 2020) Electric 203 140 9.50% December 16, 2020 January 1, 2021 Natural Gas 108 74 9.65% Pepco - District of Columbia (d) May 30, 2019 (amended June 1, 2020) Electric 136 109 9.275% June 8, 2021 July 1, 2021 Pepco - Maryland (e) October 26, 2020 (amended March 31, 2021) Electric 104 52 9.55% June 28, 2021 June 28, 2021 DPL - Maryland September 1, 2021 (amended December 23, 2021) (f) Electric 27 13 9.60% March 2, 2022 March 2, 2022 May 19, 2022 (g) Electric 38 29 9.60% December 14, 2022 January 1, 2023 DPL - Delaware January 14, 2022 (amended August 15, 2022) Natural Gas 13 8 9.60% October 12, 2022 August 14, 2022 ACE - New Jersey (h) December 9, 2020 (amended February 26, 2021) Electric 67 41 9.60% July 14, 2021 January 1, 2022 __________ (a) Pursuant to EIMA and FEJA, ComEd’s electric distribution rates are established through a performance-based formula, which sunsets at the end of 2022. See discussion of CEJA below for details on the transition away from the electric distribution formula rate. The electric distribution formula rate includes decoupling provisions and, as a result, ComEd's electric distribution formula rate revenues are not impacted by abnormal weather, usage per customer, or number of customers. Under the performance-based formula, ComEd filed annual updates to its electric distribution formula rate on or before May 1 st , with resulting rates effective in January of the following year. ComEd’s annual electric distribution formula rate update is based on prior year actual costs and current year projected capital additions (initial year revenue requirement). The update also reconciles any differences between the revenue requirement in effect for the prior year and actual costs incurred from the year (annual reconciliation). ComEd’s 2022 approved revenue requirement reflects an increase of $37 million for the initial year revenue requirement for 2022 and an increase of $9 million related to the annual reconciliation for 2020. The revenue requirement for 2022 provides for a weighted average debt and equity return on distribution rate base of 5.72% inclusive of an allowed ROE of 7.36%, reflecting the monthly average yields for 30-year treasury bonds plus 580 basis points . The reconciliation revenue requirement for 2020 provides for a weighted average debt and equity return on distribution rate base of 5.69%, inclusive of an allowed ROE of 7.29%, reflecting the monthly yields on 30-year treasury bonds plus 580 basis points less a performance metrics penalty of 7 basis points. ComEd’s 2023 approved revenue requirement above reflects an increase of $144 million for the initial year revenue requirement for 2023 and an increase of $55 million related to the annual reconciliation for 2021. The revenue requirement for 2023 provides for a weighted average debt and equity return on distribution rate base of 5.94% inclusive of an allowed ROE of 7.85%, reflecting the monthly average yields for 30-year treasury bonds plus 580 basis points. The reconciliation revenue requirement for 2021 provides for a weighted average debt and equity return on distribution rate base of 5.91%, inclusive of an allowed ROE of 7.78%, reflecting the monthly yields on 30-year treasury bonds plus 580 basis points less a performance metrics penalty of 7 basis points. This is ComEd's last performance-based electric distribution formula rate update filing under EIMA. See discussion of CEJA below for details on the transition away from the electric distribution formula rate. (b) The PECO electric and natural gas base rate case proceedings were resolved through settlement agreements, which did not specify an approved ROE. (c) Reflects a three-year cumulative multi-year plan for 2021 through 2023. BGE proposed to use certain tax benefits to fully offset the increases in 2021 and 2022 and partially offset the increase in 2023. The MDPSC awarded BGE electric revenue requirement increases of $59 million, $39 million, and $42 million, before offsets, in 2021, 2022, and 2023, respectively, and natural gas revenue requirement increases of $53 million, $11 million, and $10 million, before offsets, in 2021, 2022, and 2023, respectively. However, the MDPSC utilized the tax benefits to fully offset the increases in 2021 and January 2022 such that customer rates remained unchanged. For the remainder of 2022, the MDPSC chose to offset only 25% of the cumulative 2021 and 2022 electric revenue requirement increases and 50% of the cumulative gas revenue requirement i ncreases. In 2021, the MDPSC deferred a decision on whether to use certain tax benefits to offset the revenue requirement increases in 2023 and directed BGE to make another proposal at the end of 2022. In September 2022 BGE proposed that tax benefits not be used to offset the 2023 revenue requirement increases. On October 26, 2022, the MDPSC accepted BGE's recommendation to not use tax benefits to offset the 2023 revenue requirement increases . (d) Reflects a cumulative multi-year plan with 18-months remaining in 2021 through 2022. The DCPSC awarded Pepco electric incremental revenue requirement increases of $42 million and $67 million, before offsets, for 2021 and 2022, respectively. However, the DCPSC utilized the acceleration of refunds for certain tax benefits along with other rate relief to partially offset the customer rate increases by $22 million and $40 million for 2021 and 2022, respectively. (e) Reflects a three-year cumulative multi-year plan for April 1, 2021 through March 31, 2024. The MDPSC awarded Pepco electric incremental revenue requirement increases of $21 million, $16 million, and $15 million, before offsets, for the 12-month periods ending March 31, 2022, 2023, and 2024, respectively. Pepco proposed to utilize certain tax benefits to fully offset the increase through 2023 and partially offset customer rate increases in 2024. However, the MDPSC only utilized the acceleration of refunds for certain tax benefits to fully offset the increases such that customer rates remain unchanged through March 31, 2022. On February 23, 2022, the MDPSC chose to offset 25% of the cumulative revenue requirement increase through March 31, 2023. Whether certain tax benefits will be used to offset the customer rate increases for the twelve months ended March 31, 2024 has not been decided, and Pepco cannot predict the outcome. (f) The approved settlement reflects a 9.60% ROE, which is solely for the purposes of calculating AFUDC and regulatory asset carrying costs. (g) Reflects a three-year cumulative multi-year plan for January 1, 2023 through December 31, 2025. The MDPSC awarded DPL electric incremental revenue requirement increases of $17 million, $6 million, and $6 million for 2023, 2024, and 2025, respectively. (h) Requested and approved increases are before New Jersey sales and use tax. The order allows ACE to retain approximately $11 million of certain tax benefits which resulted in a decrease to income tax expense in Exelon's, PHI's, and ACE's Consolidated Statements of Operations and Comprehensive Income in the third quarter of 2021. Pending Distribution Base Rate Case Proceedings Registrant/Jurisdiction Filing Date Service Requested Revenue Requirement Increase Requested ROE Expected Approval Timing ComEd - Illinois (a) January 17, 2023 Electric $ 1,472 10.50% to 10.65% Fourth quarter of 2023 DPL - Delaware (b) December 15, 2022 Electric 60 10.50% Second quarter of 2024 __________ (a) Reflects a four-year cumulative MRP for January 1, 2024 to December 31, 2027 and total requested revenue requirement increases of $877 million effective January 1, 2024, $175 million effective January 1, 2025, $217 million effective January 1, 2026, and $203 million effective January 1, 2027, based on forecasted revenue requirements. The revenue requirement will provide for a weighted average debt and equity return on distribution rate base of 7.43% in 2024, 7.50% in 2025, 7.62% in 2026, and 7.70% in 2027, inclusive of an allowed ROE of 10.50% in 2024, 10.55% in 2025, 10.60% in 2026, and 10.65% in 2027. The requested revenue requirements are based on capital structures that reflect between 50.58% and 51.19% common equity. ComEd’s MRP also includes a proposed rate phase-in to defer approximately $307 million of the $877 million year-over-year increase for 2024 revenue from 2024 to 2026. (b) The rates will go into effect on July 15, 2023, subject to refund.
Public Utilities Transmission Rate Filings [Table Text Block]	For 2022, the following total increases/(decreases) were included in the Utility Registrants' electric transmission formula rate updates: Registrant (a) Initial Revenue Requirement Increase Annual Reconciliation (Decrease) Increase Total Revenue Requirement Increase Allowed Return on Rate Base (b) Allowed ROE (c) ComEd $ 24 $ (24) $ — 8.11 % 11.50 % PECO 23 16 39 7.30 % 10.35 % BGE 25 (4) 16 (d) 7.30 % 10.50 % Pepco 16 15 31 7.60 % 10.50 % DPL 9 2 11 7.09 % 10.50 % ACE 21 13 34 7.18 % 10.50 % __________ (a) All rates are effective June 1, 2022 - May 31, 2023, subject to review by interested parties pursuant to review protocols of each Utility Registrants' tariff. (b) Represents the weighted average debt and equity return on transmission rate bases. For ComEd and PECO, the common equity component of the ratio used to calculate the weighted average debt and equity return on the transmission formula rate base is currently capped at 55% and 55.75%, respectively. (c) The rate of return on common equity for each Utility Registrant includes a 50-basis-point incentive adder for being a member of a RTO. (d) The increase in BGE's transmission revenue requirement includes a $5 million reduction related to a FERC-approved dedicated facilities charge to recover the costs of providing transmission service to specifically designated load by BGE.
Public Utilities Energy Efficiency Revenue [Table Text Block]	During 2022, the ICC approved the following total increases in ComEd's requested energy efficiency revenue requirement: Filing Date Requested Revenue Requirement Increase Approved Revenue Requirement Increase (a) Approved ROE Approval Date Rate Effective Date May 25, 2022 $ 50 $ 50 7.85 % October 27, 2022 January 1, 2023 _________ (a) ComEd’s 2023 approved revenue requirement above reflects an increase of $66 million for the initial year revenue requirement for 2023 and a decrease of $16 million related to the annual reconciliation for 2021. The revenue requirement for 2023 provides for a weighted average debt and equity return on the energy efficiency regulatory asset and rate base of 5.94% inclusive of an allowed ROE of 7.85%, reflecting the monthly average yields for 30-year treasury bonds plus 580 basis points. The revenue requirement for the 2021 reconciliation year provides for a weighted average debt and equity return on the energy efficiency regulatory asset and rate base of 5.52% inclusive of an allowed ROE of 6.99%, which includes a downward performance adjustment that decreased the ROE. The performance adjustment can either increase or decrease the ROE based upon the achievement of energy efficiency savings goals. See table below for ComEd's regulatory assets associated with its energy efficiency formula rate.
Capitalized Ratemaking Amounts Not Recognized [Table Text Block]	The following table presents authorized amounts capitalized for ratemaking purposes related to earnings on shareholders’ investment that are not recognized for financial reporting purposes in the Registrants' Consolidated Balance Sheets. These amounts will be recognized as revenues in the related Consolidated Statements of Operations and Comprehensive Income in the periods they are billable to the Utility Registrants' customers. Exelon ComEd (a) PECO BGE (b) PHI Pepco (c) DPL (c) ACE (b) December 31, 2022 $ 57 $ 8 $ — $ 28 $ 21 $ 18 $ 2 $ 1 December 31, 2021 43 1 — 37 5 3 2 — __________ (a) Reflects ComEd's unrecognized equity returns earned for ratemaking purposes on its electric distribution formula rate regulatory assets. (b) BGE's and ACE's authorized amounts capitalized for ratemaking purposes primarily relate to earnings on shareholders' investment on their respective AMI programs.
Regulatory assets 2022 [Member]
Public Utilities, General Disclosures [Line Items]
Schedule of Regulatory Assets	The following tables provide information about the regulatory assets and liabilities of the Registrants as of December 31, 2022 and 2021: December 31, 2022 Exelon ComEd PECO BGE PHI Pepco DPL ACE Regulatory assets Pension and OPEB $ 1,867 $ — $ — $ — $ — $ — $ — $ — Pension and OPEB - merger related 769 — — — — — — — Deferred income taxes 606 — 595 — 11 11 — — AMI programs - deployment costs 122 — — 69 53 25 22 6 AMI programs - legacy meters 160 48 — 20 92 53 17 22 Electric distribution formula rate annual reconciliations 271 271 — — — — — — Electric distribution formula rate significant one-time events 115 115 — — — — — — Energy efficiency costs 1,434 1,434 — — — — — — Fair value of long-term debt 521 — — — 414 — — — Fair value of PHI's unamortized energy contracts 44 — — — 44 — — — Carbon mitigation credit 843 843 — — — — — — Asset retirement obligations 151 99 22 21 9 6 2 1 MGP remediation costs 318 293 13 12 — — — — Renewable energy 85 85 — — — — — — Electric energy and natural gas costs 241 — 15 25 201 41 26 134 Transmission formula rate annual reconciliations 37 — 16 — 21 3 5 13 Energy efficiency and demand response programs 560 — — 286 274 187 74 13 Under-recovered revenue decoupling 106 — — 8 98 98 — — Removal costs 782 — — 171 611 144 109 359 DC PLUG charge 37 — — — 37 37 — — Deferred storm costs 90 — — 55 35 2 2 31 COVID-19 58 20 17 8 13 10 3 — Under-recovered credit loss expense 71 38 — — 33 — — 33 Other 390 196 54 29 119 55 22 12 Total regulatory assets 9,678 3,442 732 704 2,065 672 282 624 Less: current portion 1,641 775 80 177 455 235 80 130 Total noncurrent regulatory assets $ 8,037 $ 2,667 $ 652 $ 527 $ 1,610 $ 437 $ 202 $ 494
Regulatory liabilities 2022 [Member]
Public Utilities, General Disclosures [Line Items]
Schedule of Regulatory Liabilities	December 31, 2022 Exelon ComEd PECO BGE PHI Pepco DPL ACE Regulatory liabilities Deferred income taxes $ 3,546 $ 2,010 $ — $ 682 $ 854 $ 402 $ 304 $ 148 Decommissioning the Regulatory Agreement Units 2,897 2,660 237 — — — — — Removal costs 1,750 1,604 — 35 111 20 91 — Electric energy and natural gas costs 87 11 65 4 7 — 7 — Transmission formula rate annual reconciliations 31 3 — 18 10 9 1 — Renewable portfolio standards costs 810 810 — — — — — — Stranded costs 9 — — — 9 — — 9 Energy efficiency and demand response programs 15 — 15 — — — — — Over-recovered revenue decoupling 19 — — 4 15 — 6 9 Dedicated facilities charge 110 — — 110 — — — — Other 275 41 28 10 81 30 15 16 Total regulatory liabilities 9,549 7,139 345 863 1,087 461 424 182 Less: current portion 437 226 75 47 76 6 44 26 Total noncurrent regulatory liabilities $ 9,112 $ 6,913 $ 270 $ 816 $ 1,011 $ 455 $ 380 $ 156
Regulatory assets 2021 [Member]
Public Utilities, General Disclosures [Line Items]
Schedule of Regulatory Assets	December 31, 2021 Exelon ComEd PECO BGE PHI Pepco DPL ACE Regulatory assets Pension and OPEB $ 2,409 $ — $ — $ — $ — $ — $ — $ — Pension and OPEB - merger related 893 — — — — — — — Deferred income taxes 883 — 873 — 10 10 — — AMI programs - deployment costs 145 — — 89 56 30 26 — AMI programs - legacy meters 186 69 — 29 88 60 21 7 Electric distribution formula rate annual reconciliations 44 44 — — — — — — Electric distribution formula rate significant one-time events 104 104 — — — — — — Energy efficiency costs 1,181 1,181 — — — — — — Fair value of long-term debt 557 — — — 443 — — — Fair value of PHI's unamortized energy contracts 236 — — — 236 — — — Asset retirement obligations 145 99 21 19 6 5 — 1 MGP remediation costs 283 266 8 9 — — — — Renewable energy 219 219 — — — — — — Electric energy and natural gas costs 96 — — 49 47 29 13 5 Transmission formula rate annual reconciliations 43 — 14 1 28 — 8 20 Energy efficiency and demand response programs 564 — — 283 281 199 79 3 Under-recovered revenue decoupling 157 — — 32 125 125 — — Removal costs 758 — — 143 615 147 109 360 DC PLUG charge 70 — — — 70 70 — — Deferred storm costs 49 — — — 49 3 3 43 COVID-19 82 28 33 8 13 10 3 — Under-recovered credit loss expense 89 60 — — 29 — — 29 Other 327 135 42 30 130 57 18 23 Total regulatory assets 9,520 2,205 991 692 2,226 745 280 491 Less: current portion 1,296 335 48 215 432 213 68 61 Total noncurrent regulatory assets $ 8,224 $ 1,870 $ 943 $ 477 $ 1,794 $ 532 $ 212 $ 430
Regulatory liabilities 2021 [Member]
Public Utilities, General Disclosures [Line Items]
Schedule of Regulatory Liabilities	December 31, 2021 Exelon ComEd PECO BGE PHI Pepco DPL ACE Regulatory liabilities Deferred income taxes $ 4,005 $ 2,105 $ — $ 819 $ 1,081 $ 525 $ 354 $ 202 Decommissioning the Regulatory Agreement Units 3,357 2,760 597 — — — — — Removal costs 1,694 1,541 — 39 114 20 94 — Electric energy and natural gas costs 113 25 71 — 17 9 3 5 Transmission formula rate annual reconciliations 8 7 — — 1 1 — — Renewable portfolio standards costs 500 500 — — — — — — Stranded costs 35 — — — 35 — — 24 Other 292 6 61 102 58 8 15 11 Total regulatory liabilities 10,004 6,944 729 960 1,306 563 466 242 Less: current portion 376 185 94 26 68 14 25 28 Total noncurrent regulatory liabilities $ 9,628 $ 6,759 $ 635 $ 934 $ 1,238 $ 549 $ 441 $ 214

Revenue from Contracts with C_2

Revenue from Contracts with Customers (Tables)	12 Months Ended
Revenue from Contracts with Customers (Tables)	Dec. 31, 2022
Contract Asset/Liabilities [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block]	The following table shows the amounts of future revenues expected to be recorded in each year for performance obligations that are unsatisfied or partially unsatisfied as of December 31, 2022. This disclosure only includes contracts for which the total consideration is fixed and determinable at contract inception. The average contract term varies by customer type and commodity but ranges from one month to several years. This disclosure excludes the Utility Registrants' gas and electric tariff sales contracts and transmission revenue contracts as they generally have an original expected duration of one year or less and, therefore, do not contain any future, unsatisfied performance obligations to be included in this disclosure. 2023 2024 2025 2026 2027 and thereafter Total Exelon $ 8 $ 6 $ 5 $ 5 $ 77 $ 101 PHI 8 6 5 5 77 101 Pepco 6 5 5 5 60 81 DPL 1 — — — 9 10 ACE 1 1 — — 8 10
Contract Liabilities [Member]
Contract Asset/Liabilities [Line Items]
Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block]	The following table provides a rollforward of the contract liabilities reflected in Exelon's, PHI's, Pepco's, DPL's, and ACE'S Consolidated Balance Sheets. As of December 31, 2022, 2021, and 2020, ComEd's, PECO's, and BGE's contract liabilities were not material. Exelon (a) PHI (a) Pepco (a) DPL (a) ACE (a) Balance as of December 31, 2020 $ 118 $ 118 $ 94 $ 12 $ 12 Revenues recognized (9) (9) (7) (1) (1) Balance as of December 31, 2021 109 109 87 11 11 Revenues recognized (8) (8) (6) (1) (1) Balance as of December 31, 2022 $ 101 $ 101 $ 81 $ 10 $ 10 __________

Segment Information (Tables)

Segment Information (Tables)	12 Months Ended
Segment Information (Tables)	Dec. 31, 2022
Segment Reporting [Abstract]
Analysis and reconciliation of reportable segment information	An analysis and reconciliation of the Registrants' reportable segment information to the respective information in the consolidated financial statements for the years ended December 31, 2022, 2021, and 2020 is as follows: ComEd PECO BGE PHI Other (a) Intersegment Exelon Operating revenues (b) : 2022 Electric revenues $ 5,761 $ 3,165 $ 2,871 $ 5,317 $ — $ (31) $ 17,083 Natural gas revenues — 738 1,024 238 — (5) 1,995 Shared service and other revenues — — — 10 1,823 (1,833) — Total operating revenues $ 5,761 $ 3,903 $ 3,895 $ 5,565 $ 1,823 $ (1,869) $ 19,078 2021 Electric revenues $ 6,406 $ 2,659 $ 2,505 $ 4,860 $ — $ (35) $ 16,395 Natural gas revenues — 539 836 168 — — 1,543 Shared service and other revenues — — — 13 2,213 (2,226) — Total operating revenues $ 6,406 $ 3,198 $ 3,341 $ 5,041 $ 2,213 $ (2,261) $ 17,938 2020 Electric revenues $ 5,904 $ 2,543 $ 2,336 $ 4,485 $ — $ (44) $ 15,224 Natural gas revenues — 515 762 162 — — 1,439 Shared service and other revenues — — — 16 2,035 (2,051) — Total operating revenues $ 5,904 $ 3,058 $ 3,098 $ 4,663 $ 2,035 $ (2,095) $ 16,663 Intersegment revenues (c) : 2022 $ 16 $ 7 $ 15 $ 10 $ 1,823 $ (1,865) $ 6 2021 41 21 31 13 2,203 (2,252) 57 2020 37 9 20 17 2,024 (2,084) 23 Depreciation and amortization: 2022 $ 1,323 $ 373 $ 630 $ 938 $ 61 $ — $ 3,325 2021 1,205 348 591 821 67 1 3,033 2020 1,133 347 550 782 79 — 2,891 Operating expenses: 2022 $ 4,218 $ 3,102 $ 3,376 $ 4,734 $ 2,093 $ (1,762) $ 15,761 2021 5,151 2,547 2,860 4,240 2,045 (1,587) 15,256 2020 4,950 2,512 2,598 4,045 1,882 (1,502) 14,485 Interest expense, net: 2022 $ 414 $ 177 $ 152 $ 292 $ 415 $ (3) $ 1,447 2021 389 161 138 267 335 (1) 1,289 2020 382 147 133 268 380 (3) 1,307 Income taxes: 2022 $ 264 $ 79 $ 8 $ 9 $ — $ (11) $ 349 2021 172 12 (35) 42 8 (161) 38 2020 177 (30) 41 (77) 35 (153) (7) Net income (loss) from continuing operations: 2022 $ 917 $ 576 $ 380 $ 608 $ (393) $ (34) $ 2,054 2021 742 504 408 561 (156) (443) 1,616 2020 438 447 349 495 (184) (446) 1,099 Capital expenditures: 2022 $ 2,506 $ 1,349 $ 1,262 $ 1,709 $ 95 $ — $ 6,921 2021 2,387 1,240 1,226 1,720 67 — 6,640 2020 2,217 1,147 1,247 1,604 74 — 6,289 Total assets: 2022 $ 39,661 $ 14,502 $ 13,350 $ 26,082 $ 6,014 $ (4,260) $ 95,349 2021 36,470 13,824 12,324 24,744 7,626 (8,319) 86,669 __________ (a) Other primarily includes Exelon’s corporate operations, shared service entities, and other financing and investment activities. (b) Includes gross utility tax receipts from customers. The offsetting remittance of utility taxes to the governing bodies is recorded in expenses in the Registrants’ Consolidated Statements of Operations and Comprehensive Income. See Note 22 — Supplemental Financial Information for additional information on total utility taxes. (c) See Note 23 — Related Party Transactions for additional information on intersegment revenues. PHI: Pepco DPL ACE Other (a) Intersegment PHI Operating revenues (b) : 2022 Electric revenues $ 2,531 $ 1,357 $ 1,431 $ — $ (2) $ 5,317 Natural gas revenues — 238 — — — 238 Shared service and other revenues — — — 391 (381) 10 Total operating revenues $ 2,531 $ 1,595 $ 1,431 $ 391 $ (383) $ 5,565 2021 Electric revenues $ 2,274 $ 1,212 $ 1,388 $ — $ (14) $ 4,860 Natural gas revenues — 168 — — — 168 Shared service and other revenues — — — 379 (366) 13 Total operating revenues $ 2,274 $ 1,380 $ 1,388 $ 379 $ (380) $ 5,041 2020 Electric revenues $ 2,149 $ 1,109 $ 1,245 $ — $ (18) $ 4,485 Natural gas revenues — 162 — — — 162 Shared service and other revenues — — — 372 (356) 16 Total operating revenues $ 2,149 $ 1,271 $ 1,245 $ 372 $ (374) $ 4,663 Intersegment revenues (c) : 2022 $ 5 $ 6 $ 2 $ 380 $ (383) $ 10 2021 5 7 2 380 (381) 13 2020 7 9 4 372 (375) 17 Depreciation and amortization: 2022 $ 417 $ 232 $ 261 $ 28 $ — $ 938 2021 403 210 179 29 — 821 2020 377 191 180 34 — 782 Operating expenses: 2022 $ 2,140 $ 1,359 $ 1,225 $ 393 $ (383) $ 4,734 2021 1,871 1,161 1,201 388 (381) 4,240 2020 1,799 1,120 1,123 378 (375) 4,045 Interest expense, net: 2022 $ 150 $ 66 $ 66 $ 9 $ 1 $ 292 2021 140 61 58 8 — 267 2020 138 61 59 10 — 268 Income taxes: 2022 $ (9) $ 14 $ 3 $ 1 $ — $ 9 2021 15 42 (13) (2) — 42 2020 (7) (25) (41) (4) — (77) Net income (loss): 2022 $ 305 $ 169 $ 148 $ (14) $ — $ 608 2021 296 128 146 (9) — 561 2020 266 125 112 (8) — 495 Capital expenditures: 2022 $ 874 $ 430 $ 398 $ 7 $ — $ 1,709 2021 843 429 445 3 — 1,720 2020 773 424 401 6 — 1,604 Total assets: 2022 $ 10,657 $ 5,802 $ 4,979 $ 4,677 $ (33) $ 26,082 2021 9,903 5,412 4,556 4,933 (60) 24,744 __________ (a) Other primarily includes PHI’s corporate operations, shared service entities, and other financing and investment activities. (b) Includes gross utility tax receipts from customers. The offsetting remittance of utility taxes to the governing bodies is recorded in expenses in the Registrants’ Consolidated Statements of Operations and Comprehensive Income. See Note 22 — Supplemental Financial Information for additional information on total utility taxes. (c) Includes intersegment revenues with ComEd, BGE, and PECO, which are eliminated at Exelon.
Schedule of Revenue by Major Customers by Reporting Segments	The following tables disaggregate the Registrants' revenues recognized from contracts with customers into categories that depict how the nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factors. For the Utility Registrants, the disaggregation of revenues reflects the two primary utility services of electric sales and natural gas sales (where applicable), with further disaggregation of these tariff sales provided by major customer groups. Exelon's disaggregated revenues are consistent with the Utility Registrants, but exclude any intercompany revenues. 2022 Revenues from contracts with customers ComEd PECO BGE PHI Pepco DPL ACE Electric revenues Residential $ 3,304 $ 2,026 $ 1,564 $ 2,590 $ 1,076 $ 750 $ 764 Small commercial & industrial 1,173 521 327 607 155 235 217 Large commercial & industrial 5 299 567 1,422 1,083 137 202 Public authorities & electric railroads 29 30 27 64 34 15 15 Other (a) 955 271 398 695 208 227 252 Total electric revenues (b) $ 5,466 $ 3,147 $ 2,883 $ 5,378 $ 2,556 $ 1,364 $ 1,450 Natural gas revenues Residential $ — $ 512 $ 678 $ 127 $ — $ 127 $ — Small commercial & industrial — 186 111 55 — 55 — Large commercial & industrial — — 183 12 — 12 — Transportation — 26 — 15 — 15 — Other (c) — 12 68 29 — 29 — Total natural gas revenues (d) $ — $ 736 $ 1,040 $ 238 $ — $ 238 $ — Total revenues from contracts with customers $ 5,466 $ 3,883 $ 3,923 $ 5,616 $ 2,556 $ 1,602 $ 1,450 Other revenues Revenues from alternative revenue programs $ 267 $ 2 $ (47) $ (59) $ (31) $ (9) $ (19) Other electric revenues (e) 28 16 14 8 6 2 — Other natural gas revenues (e) — 2 5 — — — — Total other revenues $ 295 $ 20 $ (28) $ (51) $ (25) $ (7) $ (19) Total revenues for reportable segments $ 5,761 $ 3,903 $ 3,895 $ 5,565 $ 2,531 $ 1,595 $ 1,431 2021 Revenues from contracts with customers ComEd PECO BGE PHI Pepco DPL ACE Electric revenues Residential $ 3,233 $ 1,704 $ 1,375 $ 2,441 $ 1,003 $ 694 $ 744 Small commercial & industrial 1,571 422 267 521 135 193 193 Large commercial & industrial 559 243 459 1,123 844 94 185 Public authorities & electric railroads 45 31 27 58 31 14 13 Other (a) 926 229 371 634 205 201 229 Total electric revenues (b) $ 6,334 $ 2,629 $ 2,499 $ 4,777 $ 2,218 $ 1,196 $ 1,364 Natural gas revenues Residential $ — $ 372 $ 518 $ 97 $ — $ 97 $ — Small commercial & industrial — 136 83 42 — 42 — Large commercial & industrial — — 147 7 — 7 — Transportation — 24 — 14 — 14 — Other (c) — 7 68 8 — 8 — Total natural gas revenues (d) $ — $ 539 $ 816 $ 168 $ — $ 168 $ — Total revenues from contracts with customers $ 6,334 $ 3,168 $ 3,315 $ 4,945 $ 2,218 $ 1,364 $ 1,364 Other revenues Revenues from alternative revenue programs $ 42 $ 26 $ 12 $ 91 $ 53 $ 14 $ 24 Other electric revenues (e) 30 4 11 5 3 2 — Other natural gas revenues (e) — — 3 — — — — Total other revenues $ 72 $ 30 $ 26 $ 96 $ 56 $ 16 $ 24 Total revenues for reportable segments $ 6,406 $ 3,198 $ 3,341 $ 5,041 $ 2,274 $ 1,380 $ 1,388 2020 Revenues from contracts with customers ComEd PECO BGE PHI Pepco DPL ACE Electric revenues Residential $ 3,090 $ 1,656 $ 1,345 $ 2,332 $ 988 $ 652 $ 692 Small commercial & industrial 1,399 386 241 472 132 171 169 Large commercial & industrial 515 228 406 1,001 736 89 176 Public authorities & electric railroads 45 29 27 60 34 13 13 Other (a) 884 225 309 613 218 190 207 Total electric revenues (b) $ 5,933 $ 2,524 $ 2,328 $ 4,478 $ 2,108 $ 1,115 $ 1,257 Natural gas revenues Residential $ — $ 361 $ 504 $ 96 $ — $ 96 $ — Small commercial & industrial — 126 79 42 — 42 — Large commercial & industrial — — 135 4 — 4 — Transportation — 24 — 14 — 14 — Other (c) — 4 29 6 — 6 — Total natural gas revenues (d) $ — $ 515 $ 747 $ 162 $ — $ 162 $ — Total revenues from contracts with customers $ 5,933 $ 3,039 $ 3,075 $ 4,640 $ 2,108 $ 1,277 $ 1,257 Other revenues Revenues from alternative revenue programs $ (47) $ 16 $ 16 $ 21 $ 40 $ (7) $ (12) Other electric revenues (e) 18 3 5 2 1 1 — Other natural gas revenues (e) — — 2 — — — — Total other revenues $ (29) $ 19 $ 23 $ 23 $ 41 $ (6) $ (12) Total revenues for reportable segments $ 5,904 $ 3,058 $ 3,098 $ 4,663 $ 2,149 $ 1,271 $ 1,245 __________ (a) Includes revenues from transmission revenue from PJM, wholesale electric revenue and mutual assistance revenue. (b) Includes operating revenues from affiliates in 2022, 2021, and 2020 respectively of: • $16 million, $41 million, and $37 million at ComEd • $7 million, $20 million, and $8 million at PECO • $7 million, $13 million, and $10 million at BGE • $10 million, $13 million, and $17 million at PHI • $5 million, $5 million, and $7 million at Pepco • $6 million, $7 million, and $9 million at DPL • $2 million, $2 million, and $4 million at ACE (c) Includes revenues from off-system natural gas sales. (d) Includes operating revenues from affiliates in 2022, 2021, and 2020 respectively of: • less than $1 million, $1 million, and $1 million at PECO • $8 million, $18 million, and $10 million at BGE (e) Includes late payment charge revenues.

Accounts Receivable (Tables)

Accounts Receivable (Tables)	12 Months Ended
Accounts Receivable (Tables)	Dec. 31, 2022
Receivables [Abstract]
Allowance for Credit Losses Rollforward	The following tables present the rollforward of Allowance for Credit Losses on Customer Accounts Receivable. Year Ended December 31, 2022 Exelon ComEd PECO BGE PHI Pepco DPL ACE Balance as of December 31, 2021 $ 320 $ 73 $ 105 $ 38 $ 104 $ 37 $ 18 $ 49 Plus: Current period provision for expected credit losses (a)(b) 176 29 52 37 58 31 12 15 Less: Write-offs, net (c)(d)(e) of recoveries (f) 169 43 52 21 53 21 9 23 Balance as of December 31, 2022 $ 327 $ 59 $ 105 $ 54 $ 109 $ 47 $ 21 $ 41 Year Ended December 31, 2021 Exelon ComEd PECO BGE PHI Pepco DPL ACE Balance as of December 31, 2020 $ 334 $ 97 $ 116 $ 35 $ 86 $ 32 $ 22 $ 32 Plus: Current period provision for expected credit losses 96 21 23 15 37 13 6 18 Less: Write-offs, net of recoveries 110 45 34 12 19 8 10 1 Balance as of December 31, 2021 $ 320 $ 73 $ 105 $ 38 $ 104 $ 37 $ 18 $ 49 _________ (a) For PECO, BGE, Pepco and DPL, the change in current period provision for expected credit losses is primarily a result of increased receivable balances. (b) For ACE, the change in current period provision for expected credit losses is primarily a result of decreased receivable balances. (c) For PECO, the change in write-offs is primarily a result of increased disconnection activities. (d) For PHI, Pepco and ACE, the change in write-offs is primarily related to the termination of the moratoriums in the District of Columbia and New Jersey, which beginning in March 2020, prevented customer disconnections for non-payment. With disconnection activities restarting in January 2022, write-offs of aging accounts receivable increased during the year. (e) For DPL, the change in write-offs is primarily a result of favorable customer payment behavior. (f) Recoveries were not material to the Registrants. The following tables present the rollforward of Allowance for Credit Losses on Other Accounts Receivable. Year Ended December 31, 2022 Exelon ComEd PECO BGE PHI Pepco DPL ACE Balance as of December 31, 2021 $ 72 $ 17 $ 7 $ 9 $ 39 $ 16 $ 8 $ 15 Plus: Current period provision (benefit) for expected credit losses 26 3 6 6 11 9 (1) 3 Less: Write-offs, net of recoveries (a) 16 3 4 5 4 — — 4 Balance as of December 31, 2022 $ 82 $ 17 $ 9 $ 10 $ 46 $ 25 $ 7 $ 14 Year Ended December 31, 2021 Exelon ComEd PECO BGE PHI Pepco DPL ACE Balance as of December 31, 2020 $ 71 $ 21 $ 8 $ 9 $ 33 $ 13 $ 9 $ 11 Plus: Current period provision (benefit) for expected credit losses 11 (2) 3 4 6 3 (1) 4 Less: Write-offs, net of recoveries 10 2 4 4 — — — — Balance as of December 31, 2021 $ 72 $ 17 $ 7 $ 9 $ 39 $ 16 $ 8 $ 15 _________ (a) Recoveries were not material to the Registrants.
Unbilled Customer Revenue	The following table provides additional information about unbilled customer revenues recorded in the Registrants' Consolidated Balance Sheets as of December 31, 2022 and 2021. Unbilled customer revenues (a) Exelon ComEd PECO BGE PHI Pepco DPL ACE December 31, 2022 $ 912 $ 223 $ 219 $ 247 $ 223 $ 103 $ 74 $ 46 December 31, 2021 747 240 161 171 175 82 53 40 _________ (a) Unbilled customer revenues are classified in Customer accounts receivables, net in the Registrants' Consolidated Balance Sheets.
Purchases and Sales of Accounts Receivable	The following tables present the total receivables purchased. Total receivables purchased Exelon (a) ComEd (a) PECO (a) BGE (a) PHI Pepco DPL ACE Year ended December 31, 2022 $ 3,981 $ 965 $ 1,081 $ 792 $ 1,143 $ 723 $ 205 $ 215 Year ended December 31, 2021 $ 3,840 $ 1,031 $ 1,041 $ 687 $ 1,081 $ 660 $ 217 $ 204 _________ (a) For BGE, includes $4 million of receivables purchased from Generation prior to the separation on February 1, 2022 for the year ended December 31, 2022. For ComEd, PECO, and BGE, includes $1 million, $1 million, and $21 million of receivables purchased from Generation, respectively, for the year ended December 31, 2021.

Property, Plant and Equipment_2

Property, Plant and Equipment (Tables)	12 Months Ended
Property, Plant and Equipment (Tables)	Dec. 31, 2022
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment	The following tables present a summary of property, plant, and equipment by asset category as of December 31, 2022 and 2021: Asset Category Exelon ComEd PECO BGE PHI Pepco DPL ACE December 31, 2022 Electric—transmission and distribution $ 69,034 $ 32,906 $ 10,719 $ 9,993 $ 17,165 $ 11,270 $ 5,231 $ 5,219 Gas—transportation and distribution 8,126 — 3,619 4,074 696 — 855 — Common—electric and gas 2,521 — 1,071 1,317 228 — 206 — Construction work in progress 4,534 1,174 744 487 2,101 1,526 271 296 Other property, plant, and equipment (a) 791 106 50 50 114 65 29 26 Total property, plant, and equipment 85,006 34,186 16,203 15,921 20,304 12,861 6,592 5,541 Less: accumulated depreciation 15,930 6,673 4,078 4,583 2,618 4,067 1,772 1,551 Property, plant, and equipment, net $ 69,076 $ 27,513 $ 12,125 $ 11,338 $ 17,686 $ 8,794 $ 4,820 $ 3,990 December 31, 2021 Electric—transmission and distribution $ 64,771 $ 31,077 $ 10,076 $ 9,352 $ 16,062 $ 10,798 $ 4,957 $ 4,882 Gas—transportation and distribution 7,429 — 3,339 3,712 646 — 806 — Common—electric and gas 2,335 — 1,005 1,224 201 — 180 — Construction work in progress 3,698 918 620 554 1,590 1,118 229 242 Other property, plant and equipment (a) 755 99 41 34 107 63 23 25 Total property, plant and equipment 78,988 32,094 15,081 14,876 18,606 11,979 6,195 5,149 Less: accumulated depreciation 14,430 6,099 3,964 4,299 2,108 3,875 1,635 1,420 Property, plant, and equipment, net $ 64,558 $ 25,995 $ 11,117 $ 10,577 $ 16,498 $ 8,104 $ 4,560 $ 3,729 __________ (a) Primarily composed of land and non-utility property. The following table presents the average service life for each asset category in number of years: Average Service Life (years) Asset Category Exelon ComEd PECO BGE PHI Pepco DPL ACE Electric - transmission and distribution 5-80 5-80 5-70 5-80 5-75 5-75 5-75 5-75 Gas - transportation and distribution 5-80 N/A 5-70 5-80 5-75 N/A 5-75 N/A Common - electric and gas 4-75 N/A 5-55 4-50 5-75 N/A 5-75 N/A Other property, plant, and equipment 4-61 31-50 50 20-50 10-43 10-33 10-43 13-15
Property Plant And Equipment Average Service Life Percentage By Asset Category Table	The following table presents the annual depreciation rates for each asset category. Annual Depreciation Rates Exelon ComEd PECO BGE PHI Pepco DPL ACE December 31, 2022 Electric—transmission and distribution 2.87% 3.00% 2.29% 2.82% 2.96% 2.58% 3.08% 3.38% Gas—transportation and distribution 2.14% N/A 1.87% 2.53% 1.45% N/A 1.45% N/A Common—electric and gas 7.54% N/A 6.31% 8.20% 8.96% N/A 10.03% N/A December 31, 2021 Electric—transmission and distribution 2.81% 2.94% 2.28% 2.80% 2.87% 2.56% 2.86% 3.21% Gas—transportation and distribution 2.13% N/A 1.84% 2.54% 1.47% N/A 1.47% N/A Common—electric and gas 7.31% N/A 6.34% 7.88% 8.33% N/A 8.69% N/A December 31, 2020 Electric—transmission and distribution 2.79% 2.95% 2.31% 2.69% 2.81% 2.53% 2.85% 3.08% Gas—transportation and distribution 2.14% N/A 1.85% 2.56% 1.50% N/A 1.50% N/A Common—electric and gas 7.01% N/A 6.39% 7.45% 7.36% N/A 6.72% N/A
Schedule Of Capitalized Interest And AFUDC	The following table summarizes credits to AFUDC by year: Exelon ComEd PECO BGE PHI Pepco DPL ACE December 31, 2022 AFUDC debt and equity $ 215 $ 54 $ 42 $ 29 $ 90 $ 69 $ 10 $ 11 December 31, 2021 AFUDC debt and equity $ 189 $ 47 $ 34 $ 36 $ 72 $ 59 $ 8 $ 5 December 31, 2020 AFUDC debt and equity $ 150 $ 42 $ 23 $ 30 $ 55 $ 42 $ 6 $ 7

Jointly Owned Electric Utilit_2

Jointly Owned Electric Utility Plant (Tables)	12 Months Ended
Jointly Owned Electric Utility Plant (Tables)	Dec. 31, 2022
Public Utilities, Property, Plant and Equipment [Abstract]
Schedule of Jointly Owned Utility Plants	PECO's, DPL's, and ACE's material undivided ownership interests in jointly owned electric plants and transmission facilities as of December 31, 2022 and 2021 were as follows: Transmission NJ/DE (a) Operator PSEG/DPL Ownership interest various Exelon’s share as of December 31, 2022: Plant in service $ 103 Accumulated depreciation 56 Exelon’s share as of December 31, 2021: Plant in service $ 103 Accumulated depreciation 55 __________ (a) PECO, DPL, and ACE own a 42.55%, 1%, and 13.9% share, respectively, in 151.3 miles of 500kV lines located in New Jersey and in the Salem generating plant substation. PECO, DPL, and ACE also own a 42.55%, 7.45%, and 7.45% share, respectively, in 2.5 miles of 500kV line located over the Delaware River. ACE also has a 21.78% share in a 500kV New Freedom Switching substation.

Asset Retirement Obligations (T

Asset Retirement Obligations (Tables)	12 Months Ended
Asset Retirement Obligations (Tables)	Dec. 31, 2022
Asset Retirement Obligation Disclosure [Abstract]
Asset Retirement Obligation Rollforward	The following table provides a rollforward of the AROs reflected in the Registrants’ Consolidated Balance Sheets from December 31, 2020 to December 31, 2022: Exelon ComEd PECO BGE PHI Pepco DPL ACE AROs as of December 31, 2020 $ 249 $ 129 $ 29 $ 23 $ 59 $ 39 $ 14 $ 6 Net increase due to changes in, and timing of, estimated future cash flows 26 15 — 2 10 5 2 3 Accretion expense (a) 7 4 1 1 1 1 — — Payments (8) (2) (1) — — — — — AROs as of December 31, 2021 274 146 29 26 70 45 16 9 Net (decrease) increase due to changes in, and timing of, estimated future cash flows (8) 2 (1) 3 (13) (8) (3) (2) Accretion expense (a) 8 4 1 1 2 2 — — Payments (3) (2) (1) — — — — — AROs as of December 31, 2022 $ 271 $ 150 $ 28 $ 30 $ 59 $ 39 $ 13 $ 7 __________ (a) For ComEd, PECO, BGE, PHI, DPL and ACE, the majority of the accretion is recorded as an increase to a regulatory asset due to the associated regulatory treatment.

Leases (Tables)

Leases (Tables)	12 Months Ended
Leases (Tables)	Dec. 31, 2022
Leases [Abstract]
Components of Lease Cost [Table Text Block]	The components of operating lease costs were as follows: Exelon ComEd PECO BGE PHI Pepco DPL ACE For the year ended December 31, 2022 Operating lease costs $ 66 $ 2 $ — $ 15 $ 42 $ 10 $ 12 $ 6 Variable lease costs 8 1 — — 2 1 1 1 Total lease costs (a) $ 74 $ 3 $ — $ 15 $ 44 $ 11 $ 13 $ 7 For the year ended December 31, 2021 Operating lease costs $ 84 $ 3 $ — $ 30 $ 43 $ 10 $ 12 $ 6 Variable lease costs 7 1 — 1 1 — — — Total lease costs (a) $ 91 $ 4 $ — $ 31 $ 44 $ 10 $ 12 $ 6 For the year ended December 31, 2020 Operating lease costs $ 98 $ 3 $ 1 $ 33 $ 46 $ 11 $ 13 $ 6 Variable lease costs 7 1 — 1 2 1 1 — Total lease costs (a) $ 105 $ 4 $ 1 $ 34 $ 48 $ 12 $ 14 $ 6 __________ (a) Excludes sublease income recorded at Exelon, PHI, and DPL of $4 million, $4 million, and $4 million for the years ended December 31, 2022, 2021, and 2020, respectively. The components of financing lease costs were as follows: PHI Pepco DPL ACE For the year ended December 31, 2022 Amortization of ROU asset $ 14 $ 5 $ 6 $ 3 Interest on lease liabilities 4 1 2 1 Total finance lease cost $ 18 $ 6 $ 8 $ 4 For the year ended December 31, 2021 Amortization of ROU asset $ 11 $ 4 $ 4 $ 3 Interest on lease liabilities 2 1 1 — Total finance lease cost $ 13 $ 5 $ 5 $ 3 For the year ended December 31, 2020 Amortization of ROU asset $ 7 $ 3 $ 3 $ 2 Interest on lease liabilities 2 — 1 — Total finance lease cost $ 9 $ 3 $ 4 $ 2 The weighted average remaining lease terms, in years, for operating and finance leases were as follows: Operating Leases Exelon ComEd PECO BGE PHI Pepco DPL ACE As of December 31, 2022 9.5 1.0 5.5 70.9 6.8 8.1 7.9 3.3 As of December 31, 2021 8.9 3.3 6.1 13.7 7.5 8.6 8.5 3.5 As of December 31, 2020 9.0 3.8 4.2 8.3 8.2 9.1 9.1 4.0 Finance Leases PHI Pepco DPL ACE As of December 31, 2022 5.5 5.4 5.5 5.6 As of December 31, 2021 6.1 5.9 6.1 6.3 As of December 31, 2020 6.5 6.3 6.5 6.5 The weighted average discount rates for operating and finance leases were as follows: Operating Leases Exelon ComEd PECO BGE PHI Pepco DPL ACE As of December 31, 2022 3.9 % 2.6 % 2.3 % 4.5 % 4.2 % 4.0 % 4.0 % 3.3 % As of December 31, 2021 4.0 % 2.8 % 2.2 % 4.0 % 4.2 % 4.0 % 4.0 % 3.4 % As of December 31, 2020 4.0 % 3.0 % 2.9 % 3.8 % 4.2 % 4.0 % 4.0 % 3.5 % Finance Leases PHI Pepco DPL ACE As of December 31, 2022 2.3 % 2.3 % 2.3 % 2.4 % As of December 31, 2021 2.2 % 2.3 % 2.1 % 2.1 % As of December 31, 2020 2.5 % 2.6 % 2.4 % 2.4 % ROU assets obtained in exchange for operating and finance lease obligations were as follows: Operating Leases Exelon ComEd PECO BGE PHI Pepco DPL ACE For the year ended December 31, 2022 $ 46 $ — $ — $ — $ 2 $ — $ 1 $ 1 For the year ended December 31, 2021 1 — — (1) 1 — 1 — For the year ended December 31, 2020 (2) — 1 — (1) — (1) — Finance Leases PHI Pepco DPL ACE For the year ended December 31, 2022 $ 14 $ 4 $ 7 $ 3 For the year ended December 31, 2021 32 12 12 8 For the year ended December 31, 2020 29 8 14 7
Supplemental Balance Sheet Information Related to Lessee Right-of-Use Assets and Lease Liabilities [Table Text Block]	The following tables provide additional information regarding the presentation of operating and finance lease ROU assets and lease liabilities within the Registrants’ Consolidated Balance Sheets: Operating Leases Exelon ComEd PECO BGE PHI Pepco DPL ACE As of December 31, 2022 Operating lease ROU assets Other deferred debits and other assets $ 265 $ 2 $ 1 $ 2 $ 180 $ 36 $ 39 $ 9 Operating lease liabilities Other current liabilities 40 2 — — 31 6 8 3 Other deferred credits and other liabilities 266 — 1 4 167 34 42 7 Total operating lease liabilities $ 306 $ 2 $ 1 $ 4 $ 198 $ 40 $ 50 $ 10 As of December 31, 2021 Operating lease ROU assets Other deferred debits and other assets $ 271 $ 5 $ 1 $ 16 $ 209 $ 43 $ 46 $ 11 Operating lease liabilities Other current liabilities 52 2 — 15 31 6 8 3 Other deferred credits and other liabilities 263 3 1 4 195 40 49 9 Total operating lease liabilities $ 315 $ 5 $ 1 $ 19 $ 226 $ 46 $ 57 $ 12 Finance Leases PHI Pepco DPL ACE As of December 31, 2022 Finance lease ROU assets Plant, property and equipment, net $ 74 $ 25 $ 31 $ 18 Finance lease liabilities Long-term debt due within one year 12 4 5 3 Long-term debt 64 21 27 16 Total finance lease liabilities $ 76 $ 25 $ 32 $ 19 As of December 31, 2021 Finance lease ROU assets Plant, property and equipment, net $ 73 $ 25 $ 29 $ 19 Finance lease liabilities Long-term debt due within one year 10 3 4 3 Long-term debt 64 23 25 16 Total finance lease liabilities $ 74 $ 26 $ 29 $ 19
Lessee, Operating Lease, Liability, Maturity [Table Text Block]	Future minimum lease payments for operating and finance leases as of December 31, 2022 were as follows: Operating Leases Year Exelon ComEd PECO BGE PHI Pepco DPL ACE 2023 $ 52 $ 2 $ — $ 1 $ 37 $ 7 $ 10 $ 4 2024 45 — — — 35 6 9 3 2025 43 — — — 34 6 7 2 2026 39 — — — 30 5 5 1 2027 39 — — — 29 4 6 1 Remaining years 161 — 1 18 67 20 25 — Total 379 2 1 19 232 48 62 11 Interest 73 — — 15 34 8 12 1 Total operating lease liabilities $ 306 $ 2 $ 1 $ 4 $ 198 $ 40 $ 50 $ 10
Finance Lease, Liability, Fiscal Year Maturity	Finance Leases Year PHI Pepco DPL ACE 2023 $ 14 $ 5 $ 6 $ 3 2024 14 5 6 3 2025 15 5 6 4 2026 15 5 6 4 2027 12 4 5 3 Remaining years 12 4 5 3 Total 82 28 34 20 Interest 6 3 2 1 Total finance lease liabilities $ 76 $ 25 $ 32 $ 19
Schedule of Supplemental Cash Flow Information Related to Leases [Table Text Block]	Cash paid for amounts included in the measurement of operating and finance lease liabilities were as follows: Operating cash flows from operating leases Exelon ComEd PECO BGE PHI Pepco DPL ACE For the year ended December 31, 2022 $ 66 $ 3 $ — $ 16 $ 37 $ 8 $ 9 $ 4 For the year ended December 31, 2021 93 3 — 46 39 8 9 4 For the year ended December 31, 2020 67 3 1 20 39 8 9 4 Financing cash flows from finance leases PHI Pepco DPL ACE For the year ended December 31, 2022 $ 13 $ 5 $ 5 $ 3 For the year ended December 31, 2021 10 3 4 3 For the year ended December 31, 2020 6 2 3 1
Components of Operating Lease Income [Table Text Block]	The components of lease income were as follows: Exelon ComEd PECO BGE PHI Pepco DPL For the year ended December 31, 2022 Operating lease income $ 4 $ — $ — $ — $ 4 $ — $ 3 Variable lease income 1 — — — 1 — 1 For the year ended December 31, 2021 Operating lease income $ 5 $ — $ — $ — $ 4 $ — $ 3 Variable lease income 1 — — — 1 — 1 For the year ended December 31, 2020 Operating lease income $ 5 $ — $ — $ — $ 3 $ — $ 3 Variable lease income 1 — — — 1 — 1
Lessor, Operating Lease, Payment to be Received, Fiscal Year Maturity [Table Text Block]	Future minimum lease payments to be recovered under operating leases as of December 31, 2022 were as follows: Year Exelon ComEd PECO BGE PHI Pepco DPL 2023 $ 5 $ 1 $ — $ — $ 4 $ — $ 3 2024 5 1 — — 3 — 3 2025 5 — — — 4 — 5 2026 5 — — — 5 — 4 2027 5 — — — 5 — 4 Remaining years 27 — 4 1 23 — 22 Total $ 52 $ 2 $ 4 $ 1 $ 44 $ — $ 41

Intangible Assets (Tables)

Intangible Assets (Tables)	12 Months Ended
Intangible Assets (Tables)	Dec. 31, 2022
Finite-Lived Intangible Assets [Line Items]
Schedule Of Goodwill	The following table presents the gross amount, accumulated impairment loss, and carrying amount of goodwill at Exelon, ComEd, and PHI as of December 31, 2022 and 2021. There were no additions or impairments during the years ended December 31, 2022 and 2021. Gross Amount Accumulated Impairment Loss Carrying Amount Exelon $ 8,613 $ 1,983 $ 6,630 ComEd (a) 4,608 1,983 2,625 PHI (b) 4,005 — 4,005 __________ (a) Reflects goodwill recorded in 2000 from the PECO/Unicom merger (predecessor parent company of ComEd). (b) Reflects goodwill recorded in 2016 from the PHI merger.
Schedule of Finite-Lived Intangible Assets	Exelon’s other intangible assets, included in Other current assets and Other deferred debits and other assets in the Consolidated Balance Sheets, consisted of the following as of December 31, 2022 and 2021. Exelon's and PHI's other intangible liabilities, included in current and noncurrent Unamortized energy contract liabilities in their Consolidated Balance Sheets, consisted of the following as of December 31, 2022 and 2021. The intangible assets and liabilities shown below are amortized on a straight-line basis, except for unamortized energy contracts which are amortized in relation to the expected realization of the underlying cash flows: December 31, 2022 December 31, 2021 Gross Accumulated Amortization Net Gross Accumulated Amortization Net Exelon Unamortized Energy Contracts $ (1,515) $ 1,470 $ (45) $ (1,515) $ 1,280 $ (235) Software License 81 (61) 20 81 (53) 28 Exelon Total $ (1,434) $ 1,409 $ (25) $ (1,434) $ 1,227 $ (207) PHI Unamortized Energy Contracts $ (1,515) $ 1,470 $ (45) $ (1,515) $ 1,280 $ (235)
Schedule Of Finite-Lived Intangible Assets Amortization Expense	The following table summarizes the amortization expense related to intangible assets and liabilities for each of the years ended December 31, 2022, 2021, and 2020: For the Years Ended December 31, Exelon (a) PHI (a) 2022 (b) $ (182) $ (190) 2021 (83) (92) 2020 (98) (115) __________ (a) For PHI unamortized energy contracts, the amortization of the fair value adjustment amounts and the corresponding offsetting regulatory asset amounts are amortized through Purchased power and fuel expense in their Consolidated Statements of Operations and Comprehensive Income resulting in no effect to net income. (b) On March 23, 2022, the NJBPU approved a petition by ACE to terminate the provisions in its PPAs. As such, the contract was fully amortized during the year ended December 31, 2022. See Note 3 - Regulatory Matters for additional information.
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]	The following table summarizes the estimated future amortization expense related to intangible assets and liabilities as of December 31, 2022: For the Years Ending December 31, Exelon PHI 2023 $ (2) $ (10) 2024 — (8) 2025 (2) (5) 2026 (5) (5) 2027 (4) (4)

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
Income Taxes (Tables)	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Schedule of Components of Income Tax Expense (Benefit)	Income tax expense (benefit) from continuing operations is comprised of the following components: For the Year Ended December 31, 2022 Exelon ComEd PECO BGE PHI Pepco DPL ACE Included in operations: Federal Current $ (24) $ 29 $ 13 $ (1) $ 16 $ 9 $ (2) $ 6 Deferred 106 117 18 (3) (23) (2) 2 (15) Investment tax credit amortization (3) (1) — — (1) — — — State Current (13) (6) (4) — 2 — — — Deferred 283 125 52 12 15 (16) 14 12 Total $ 349 $ 264 $ 79 $ 8 $ 9 $ (9) $ 14 $ 3 For the Year Ended December 31, 2021 Exelon ComEd PECO BGE PHI Pepco DPL ACE Included in operations: Federal Current $ (152) $ (30) $ 1 $ (18) $ 18 $ 22 $ 2 $ 1 Deferred 89 113 20 34 (52) (17) (14) (26) Investment tax credit amortization (2) (1) — — (1) — — — State Current (46) (41) — — — 1 1 — Deferred 149 131 (9) (51) 77 9 53 12 Total $ 38 $ 172 $ 12 $ (35) $ 42 $ 15 $ 42 $ (13) For the Year Ended December 31, 2020 Exelon ComEd PECO BGE PHI Pepco DPL ACE Included in operations: Federal Current $ (180) $ (24) $ (7) $ 4 $ 25 $ 40 $ (13) $ (4) Deferred 10 112 1 10 (129) (62) (20) (43) Investment tax credit amortization (3) (2) — — (1) — — — State Current (37) (27) — — (5) — — — Deferred 203 118 (24) 27 33 15 8 6 Total $ (7) $ 177 $ (30) $ 41 $ (77) $ (7) $ (25) $ (41)
Effective Income Tax Rate Reconciliation	The effective income tax rate from continuing operations varies from the U.S. federal statutory rate principally due to the following: For the Year Ended December 31, 2022 (a) Exelon ComEd PECO (b) BGE (b) PHI (b) Pepco (b) DPL (b) ACE (b) U.S. federal statutory rate 21.0 % 21.0 % 21.0 % 21.0 % 21.0 % 21.0 % 21.0 % 21.0 % Increase (decrease) due to: State income taxes, net of Federal income tax benefit (c) 8.8 8.0 5.8 2.6 2.1 (4.1) 6.5 6.9 Plant basis differences (4.1) (0.6) (11.9) (1.0) (1.7) (2.7) (0.7) (0.7) Excess deferred tax amortization (11.8) (5.6) (3.0) (19.8) (19.5) (16.8) (18.4) (24.5) Amortization of investment tax credit, including deferred taxes on basis differences (0.1) (0.1) — (0.1) (0.1) — (0.2) (0.2) Tax credits (d) 0.1 (0.3) — (0.7) (0.7) (0.7) (0.6) (0.5) Other (e) 0.6 — 0.2 0.1 0.4 0.3 0.1 — Effective income tax rate 14.5 % 22.4 % 12.1 % 2.1 % 1.5 % (3.0) % 7.7 % 2.0 % For the Year Ended December 31, 2021 (a) Exelon ComEd PECO (f) BGE (f) PHI Pepco (f) DPL (f) ACE (f) U.S. federal statutory rate 21.0 % 21.0 % 21.0 % 21.0 % 21.0 % 21.0 % 21.0 % 21.0 % Increase (decrease) due to: State income taxes, net of federal income tax benefit 5.0 7.8 (1.4) (10.8) 10.1 2.7 25.0 7.4 Plant basis differences (5.4) (0.8) (13.6) (1.7) (1.1) (1.6) (0.8) (0.2) Excess deferred tax amortization (17.2) (7.6) (3.8) (16.3) (22.4) (16.4) (20.0) (37.1) Amortization of investment tax credit, including deferred taxes on basis differences (0.1) (0.1) — (0.1) (0.1) — (0.2) (0.2) Tax credits (0.7) (0.5) — (0.9) (0.5) (0.5) (0.4) (0.5) Other (0.3) (1.0) 0.1 (0.6) — (0.4) 0.1 (0.2) Effective income tax rate 2.3 % 18.8 % 2.3 % (9.4) % 7.0 % 4.8 % 24.7 % (9.8) % For the Year Ended December 31, 2020 (a) Exelon ComEd (g) PECO (g) BGE (h) PHI (h) Pepco (h) DPL (h) ACE (h) U.S. federal statutory rate 21.0 % 21.0 % 21.0 % 21.0 % 21.0 % 21.0 % 21.0 % 21.0 % Increase (decrease) due to: State income taxes, net of federal income tax benefit 11.9 11.6 (4.5) 5.5 5.1 4.5 6.6 7.0 Plant basis differences (8.6) (0.6) (18.7) (1.5) (1.6) (1.7) (0.4) (3.0) Excess deferred tax amortization (29.1) (11.2) (4.6) (13.9) (42.0) (25.4) (51.7) (82.1) Amortization of investment tax credit, including deferred taxes on basis differences (0.3) (0.3) — (0.1) (0.2) (0.1) (0.3) (0.5) Tax credits (0.5) (0.3) — (0.4) (0.3) (0.3) (0.3) (0.5) Deferred Prosecution Agreement payments 3.8 6.8 — — — — — — Other 1.2 1.8 (0.4) (0.1) (0.4) (0.7) 0.1 0.4 Effective income tax rate (0.6) % 28.8 % (7.2) % 10.5 % (18.4) % (2.7) % (25.0) % (57.7) % __________ (a) Positive percentages represent income tax expense. Negative percentages represent income tax benefit. (b) For PECO, the lower effective tax rate is primarily related to plant basis differences attributable to tax repair deductions partially offset by higher state income taxes, net of federal income tax benefit, related to a one-time expense of $38 million attributable to the change in the Pennsylvania corporate income tax rate. For BGE, PHI, Pepco, DPL, and ACE, the lower effective tax rate is primarily related to the acceleration of certain income tax benefits due to distribution and transmission rate case settlements. (c) For Exelon, the higher state income taxes, net of federal income tax benefit, is primarily due to the long-term marginal state income tax rate change of $67 million and the recognition of a valuation allowance of $40 million against the net deferred tax asset position for certain standalone state filing jurisdictions, partially offset by a one-time impact associated with a state tax benefit of $43 million and indemnification adjustments pursuant to the Tax Matters Agreement of $11 million as a result of the separation. For PECO, the higher state income taxes, net of federal income tax benefit, related to a one-time expense of $38 million attributable to the change in the Pennsylvania corporate income tax rate. (d) For Exelon, reflects the income tax expense related to the write-off of federal tax credits subject to recapture of $15 million as a result of the separation. (e) For Exelon, reflects the nondeductible transaction costs of approximately $12 million arising as part of the separation and indemnification adjustments pursuant to the Tax Matters Agreement of $9 million. (f) For PECO, the lower effective tax rate is primarily related to plant basis differences attributable to tax repair deductions. For BGE, the income tax benefit is primarily due to the Maryland multi-year plan which resulted in the acceleration of certain income tax benefits. For Pepco, the lower effective tax rate is primarily related to the acceleration of certain income tax benefits due to distribution and transmission rate case settlements. For DPL, the higher effective tax rate is primarily related to a state income tax expense, net of federal income tax benefit, due to the recognition of a valuation allowance of approximately $31 million against a deferred tax asset associated with Delaware net operating loss carryforwards as a result of a change in Delaware tax law. For ACE, the income tax benefit is primarily due to a distribution rate case settlement which allows ACE to retain certain tax benefits. (g) For ComEd, the higher effective tax rate is primarily related to the nondeductible DPA payments. For PECO, the negative effective tax rate is primarily related to an increase in plant basis differences attributable to tax repair deductions related to an increase in storms and qualifying projects in 2021. (h) For BGE, PHI, Pepco, DPL, and ACE, the income tax benefit is primarily attributable to accelerated amortization of transmission related deferred income tax regulatory liabilities as a result of regulatory settlements. See Note 3 — Regulatory Matters for additional information.
Tax Effects of Temporary Differences	The tax effects of temporary differences and carryforwards, which give rise to significant portions of the deferred tax assets (liabilities), as of December 31, 2022 and 2021 are presented below: As of December 31, 2022 Exelon ComEd PECO BGE PHI Pepco DPL ACE Plant basis differences $ (12,130) $ (4,823) $ (2,119) $ (1,949) $ (3,131) $ (1,394) $ (906) $ (813) Accrual based contracts 10 — — — 10 — — — Derivatives and other financial instruments 26 23 — — 2 — — — Deferred pension and postretirement obligation 551 (300) (31) (31) (80) (76) (39) (3) Deferred debt refinancing costs 132 (5) — (2) 111 (4) (2) (1) Regulatory assets and liabilities (1,107) (131) (169) 57 (50) 7 43 11 Tax loss carryforward, net of valuation allowances 250 — 33 72 71 3 20 46 Tax credit carryforward 468 — — — — — — — Investment in partnerships (21) — — — — — — — Other, net 591 223 73 23 182 83 16 28 Deferred income tax liabilities (net) $ (11,230) $ (5,013) $ (2,213) $ (1,830) $ (2,885) $ (1,381) $ (868) $ (732) Unamortized investment tax credits (14) (8) — (2) (4) (1) (1) (2) Total deferred income tax liabilities (net) and unamortized investment tax credits $ (11,244) $ (5,021) $ (2,213) $ (1,832) $ (2,889) $ (1,382) $ (869) $ (734) As of December 31, 2021 Exelon ComEd PECO BGE PHI Pepco DPL ACE Plant basis differences $ (11,606) $ (4,648) $ (2,271) $ (1,826) $ (2,976) $ (1,321) $ (853) $ (777) Accrual based contracts 56 — — — 56 — — — Derivatives and other financial instruments 63 61 — — 2 — — — Deferred pension and postretirement obligation 641 (308) (32) (37) (90) (76) (40) (6) Deferred debt refinancing costs 146 (6) — (2) 123 (2) (1) (1) Regulatory assets and liabilities (1,130) 8 (280) 92 (53) 24 55 31 Tax loss carryforward, net of valuation allowances 242 — 65 68 64 2 18 42 Tax credit carryforward 584 — — — — — — — Investment in partnerships (21) — — — — — — — Other, net 449 216 97 21 212 99 19 34 Deferred income tax liabilities (net) $ (10,576) $ (4,677) $ (2,421) $ (1,684) $ (2,662) $ (1,274) $ (802) $ (677) Unamortized investment tax credits (15) (8) — (2) (5) (1) (1) (2) Total deferred income tax liabilities (net) and $ (10,591) $ (4,685) $ (2,421) $ (1,686) $ (2,667) $ (1,275) $ (803) $ (679)
Summary of Loss Carryforwards	The following table provides Exelon’s, PECO’s, BGE’s, PHI’s, Pepco’s, DPL’s, and ACE’s carryforwards, of which the state related items are presented on a post-apportioned basis, as well as, any corresponding valuation allowances as of December 31, 2022. ComEd does not have net operating losses or credit carryforwards for the year ended December 31, 2022. Exelon PECO BGE PHI Pepco DPL ACE Federal Federal general business credits carryforwards (a) $ 468 $ — $ — $ — $ — $ — $ — State State net operating loss carryforwards 4,991 970 1,142 1,501 50 768 651 Deferred taxes on state tax attributes (net of federal taxes) 307 37 72 104 3 52 46 Valuation allowance on state tax attributes (net of federal taxes) (b) 57 4 — 33 — 32 — Year in which net operating loss or credit carryforwards will begin to expire (c) 2035 2032 2033 2029 N/A 2032 2031 __________ (a) For Exelon, the federal general business credit carryforward will begin expiring in 2035. (b) For Exelon, a full valuation allowance has been recorded against certain separate company state net operating loss carryforwards that are expected to expire before realization. For PECO, a valuation allowance has been recorded against certain Pennsylvania net operating losses that are expected to expire before realization. For DPL, a full valuation allowance has been recorded against Delaware net operating losses carryforwards due to a change in Delaware tax law. (c) A portion of Exelon's, BGE's, Pepco's, and DPL's Maryland state net operating loss carryforward have an indefinite carryforward period.
Schedule of Unrecognized Tax Benefits Roll Forward	The following table presents changes in unrecognized tax benefits, for Exelon, PHI, and ACE. ComEd's, PECO's, BGE's, Pepco's, and DPL's amounts are not material. Exelon (a) PHI ACE Balance at January 1, 2020 $ 95 $ 48 $ 14 Change to positions that only affect timing 6 3 1 Increases based on tax positions related to 2020 3 — — Increases based on tax positions prior to 2020 26 1 — Decreases based on tax positions prior to 2020 (5) — — Balance at December 31, 2020 125 52 15 Change to positions that only affect timing 13 3 1 Increases based on tax positions related to 2021 4 1 — Increases based on tax positions prior to 2021 4 — — Decreases based on tax positions prior to 2021 (3) — — Balance at December 31, 2021 143 56 16 Change to positions that only affect timing (1) 1 1 Increases based on tax positions related to 2022 3 2 — Increases based on tax positions prior to 2022 3 — — Decreases based on tax positions prior to 2022 — — — Balance at December 31, 2022 $ 148 $ 59 $ 17 ______ (a) As of December 31, 2022, Exelon recorded a receivable of $50 million in noncurrent Other assets in the Consolidated Balance Sheet for Constellation’s share of unrecognized tax benefits for periods prior to the separation.
Summary of Positions for which Significant Change in Unrecognized Tax Benefits is Reasonably Possible	The following table presents Exelon's unrecognized tax benefits that, if recognized, would decrease the effe ctive tax rate. The Utility Registrants' amounts are not material. Exelon December 31, 2022 $ 90 December 31, 2021 77 December 31, 2020 73
Total amounts of interest and penalties recognized	The following table represents the net interest and penalties receivable (payable) related to tax positions reflected in Exelon's Consolidated Balance Sheets. The Utility Registrants' amounts are not material. Net interest and penalties receivable as of Exelon December 31, 2022 (a) (b) $ 45 December 31, 2021 (c) 43 __________ (a) As of December 31, 2022, the interest receivable balance is not expected to be settled in cash within the next twelve months and is therefore classified as a noncurrent receivable. (b) As of December 31, 2022, Exelon recorded a receivable of $1 million in noncurrent Other assets in the Consolidated Balance Sheet for Constellation's share of net interest for periods prior to the separation. (c) As of December 31, 2021, the interest receivable balance is not expected to be settled in cash within the next twelve months and is therefore classified as a noncurrent receivable. In December of 2021, Exelon received a refund of approximately $272 million related to an interest netting refund claim.
Long-Term Marginal State Income Tax Rate	The impacts to ComEd, BGE, PHI, Pepco, DPL, and ACE for the years ended December 31, 2022, 2021, and 2020 were not material. December 31, 2022 Exelon Increase to Deferred Income Tax Liability and Income Tax Expense, Net of Federal Taxes $ 67 December 31, 2021 Increase to Deferred Income Tax Liability and Income Tax Expense, Net of Federal Taxes $ 27 December 31, 2020 Increase to Deferred Income Tax Liability and Income Tax Expense, Net of Federal Taxes $ 66
Allocation of Federal Tax Benefit Under Tax Sharing Agreement	The following table presents the allocation of tax benefits from Exelon under the Tax Sharing Agreement, for the year ended December 31, 2022, 2021, and 2020. ComEd PECO BGE PHI Pepco DPL ACE December 31, 2022 (a) $ 1 $ 47 $ — $ 28 $ 23 $ 3 $ 2 December 31, 2021 (b) 1 19 — 17 16 — — December 31, 2020 (c) 14 17 — 17 8 6 1 __________ (a) BGE did not record an allocation of federal tax benefits from Exelon under the Tax Sharing Agreement as a result of a tax net operating loss. (b) BGE, DPL, and ACE did not record an allocation of federal tax benefits from Exelon under the Tax Sharing Agreement as a result of a tax net operating loss. (c) BGE did not record an allocation of federal tax benefits from Exelon under the Tax Sharing Agreement as a result of a tax net operating loss.

Retirement Benefits (Tables)

Retirement Benefits (Tables)	12 Months Ended
Retirement Benefits (Tables)	Dec. 31, 2022
Retirement Benefits [Abstract]
Defined Benefit Plan Change In Benefit Obligation RollForward	The following tables provide a rollforward of the changes in the benefit obligations and plan assets of Exelon for the most recent two years for all plans combined: Pension Benefits OPEB 2022 2021 2022 2021 Change in benefit obligation: Net benefit obligation as of the beginning of year $ 14,236 $ 14,861 $ 2,502 $ 2,661 Service cost 236 294 41 51 Interest cost 439 406 76 69 Plan participants’ contributions — — 26 32 Actuarial (gain) loss (a) (3,379) (442) (604) (116) Settlements — (23) — (5) Gross benefits paid (855) (860) (157) (190) Net benefit obligation as of the end of year $ 10,677 $ 14,236 $ 1,884 $ 2,502 Pension Benefits OPEB 2022 2021 2022 2021 Change in plan assets: Fair value of net plan assets as of the beginning of year $ 12,165 $ 11,883 $ 1,665 $ 1,635 Actual return on plan assets (2,359) 822 (225) 130 Employer contributions 570 343 42 63 Plan participants’ contributions — — 26 32 Gross benefits paid (855) (860) (157) (190) Settlements — (23) — (5) Fair value of net plan assets as of the end of year $ 9,521 $ 12,165 $ 1,351 $ 1,665 __________ (a) The pension and OPEB gains in 2022 and 2021 primarily reflect an increase in the discount rate.
Schedule of Amounts Recognized in Balance Sheet	Exelon presents its benefit obligations and plan assets net on its Consolidated Balance Sheets within the following line items: Pension Benefits OPEB 2022 2021 2022 2021 Other current liabilities $ 47 $ 20 $ 26 $ 26 Pension obligations 1,109 2,051 — — Non-pension postretirement benefit obligations — — 507 811 Unfunded status (net benefit obligation less plan assets) $ 1,156 $ 2,071 $ 533 $ 837
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets	The following table provides the ABO and fair value of plan assets for all pension plans with an ABO in excess of plan assets. Information for pension and OPEB plans with projected benefit obligations (PBO) and accumulated postretirement benefit obligation (APBO), respectively, in excess of plan assets has been disclosed in the Obligations and Plan Assets table above as all pension and OPEB plans are underfunded. Exelon ABO in Excess of Plan Assets 2022 2021 ABO $ 10,108 $ 13,497 Fair value of net plan assets 9,427 12,165
Calculation of Net Periodic Benefit Costs	The following table presents the components of Exelon’s net periodic benefit costs, prior to capitalization, for the years ended December 31, 2022, 2021, and 2020. Pension Benefits OPEB 2022 2021 2020 2022 2021 2020 Components of net periodic benefit cost: Service cost $ 236 $ 294 $ 251 $ 41 $ 51 $ 56 Interest cost 439 406 476 76 69 93 Expected return on assets (822) (843) (796) (99) (99) (101) Amortization of: Prior service cost (credit) 2 2 3 (19) (25) (76) Actuarial loss 295 399 349 12 27 34 Curtailment benefits — — — — — (1) Settlement and other charges — 7 6 — 1 1 Net periodic benefit cost $ 150 $ 265 $ 289 $ 11 $ 24 $ 6
Schedule Of Pension And Other Postretirement Benefit Costs	The amounts below represent the Registrants' allocated pension and OPEB costs. For Exelon, the service cost component is included in Operating and maintenance expense and Property, plant, and equipment, net while the non-service cost components are included in Other, net and Regulatory assets. For the Utility Registrants, the service cost and non-service cost components are included in Operating and maintenance expense and Property, plant, and equipment, net in their consolidated financial statements. For the Years Ended December 31, Exelon ComEd PECO BGE PHI Pepco DPL ACE 2022 $ 161 $ 60 $ (9) $ 44 $ 53 $ 9 $ 3 $ 12 2021 288 129 8 64 49 6 2 11 2020 296 114 5 64 70 15 7 14
Changes In Plan Assets And Benefit Obligations Recognized In OCI And Regulatory Assets	The following tables provide the components of AOCI and regulatory assets (liabilities) for Exelon for the years ended December 31, 2022, 2021, and 2020 for all plans combined. The tables include amounts related to Generation prior to the separation. Pension Benefits OPEB 2022 2021 2020 2022 2021 2020 Changes in plan assets and benefit obligations recognized in AOCI and regulatory assets (liabilities): Current year actuarial (gain) loss $ (226) $ (700) $ 941 $ (271) $ (270) $ 22 Amortization of actuarial loss (295) (598) (512) (12) (37) (49) Separation of Constellation (2,631) — — (43) — — Current year prior service cost (credit) — — — — — (111) Amortization of prior service (cost) credit (2) (3) (4) 19 34 124 Curtailments — — — — — 1 Settlements — (27) (14) — (1) (1) Total recognized in AOCI and regulatory assets (liabilities) $ (3,154) $ (1,328) $ 411 $ (307) $ (274) $ (14) Total recognized in AOCI $ (2,719) $ (747) $ 271 $ (74) $ (130) $ 6 Total recognized in regulatory assets (liabilities) $ (435) $ (581) $ 140 $ (233) $ (144) $ (20)
Schedule of Amounts in Accumulated Other Comprehensive Income (Loss) to be Recognized over Next Fiscal Year	The following table provides the components of gross accumulated other comprehensive loss and regulatory assets (liabilities) for Exelon that have not been recognized as components of periodic benefit cost as of December 31, 2022 and 2021, respectively, for all plans combined: Pension Benefits OPEB 2022 2021 2022 2021 Prior service cost (credit) $ 19 $ 32 $ (55) $ (111) Actuarial loss (gain) 3,611 6,752 (133) 230 Total $ 3,630 $ 6,784 $ (188) $ 119 Total included in AOCI $ 873 $ 3,592 $ (21) $ 53 Total included in regulatory assets (liabilities) $ 2,757 $ 3,192 $ (167) $ 66
Defined Benefit Plan Weighted Average Assumptions Used In Calculating Benefit Obligation	For Exelon, the following assumptions were used to determine the benefit obligations for the plans as of December 31, 2022 and 2021. Assumptions used to determine year-end benefit obligations are the assumptions used to estimate the subsequent year’s net periodic benefit costs. Pension Benefits OPEB 2022 2021 2022 2021 Discount rate (a) 5.53 % 2.92 % 5.51 % 2.88 % Investment crediting rate (b) 5.07 % 3.75 % N/A N/A Rate of compensation increase 3.75 % 3.75 % 3.75 % 3.75 % Mortality table Pri-2012 table with MP- 2021 improvement scale (adjusted) Pri-2012 table with MP- 2021 improvement scale (adjusted) Pri-2012 table with MP- 2021 improvement scale (adjusted) Pri-2012 table with MP- 2021 improvement scale (adjusted) Health care cost trend on covered charges N/A N/A Initial and ultimate rate of 5.00% Initial and ultimate trend of 5.00% __________ (a) The discount rates above represent the blended rates used to determine the majority of Exelon’s pension and OPEB obligations. Certain benefit plans used individual rates, which range from 5.46% - 5.60% and 5.49% - 5.51% for pension and OPEB plans, respectively, as of December 31, 2022 and 2.55% - 3.02% and 2.84% - 2.92% for pension and OPEB plans, respectively, as of December 31, 2021. (b) The investment crediting rate above represents a weighted average rate.
Defined Benefit Plan Weighted Average Assumptions Used In Calculating Net Periodic Benefit Cost	The following assumptions were used to determine the net periodic benefit cost for Exelon for the years ended December 31, 2022, 2021 and 2020: Pension Benefits OPEB 2022 2021 2020 2022 2021 2020 Discount rate (a) 3.24 % 2.58 % 3.34 % 3.20 % 2.51 % 3.31 % Investment crediting rate (b) 3.75 % 3.72 % 3.82 % N/A N/A N/A Expected return on plan assets (c) 7.00 % 7.00 % 7.00 % 6.44 % 6.46 % 6.69 % Rate of compensation increase 3.75 % 3.75 % 3.75 % 3.75 % 3.75 % 3.75 % Mortality table Pri-2012 table with MP- 2021 improvement scale (adjusted) Pri-2012 table with MP - 2020 improvement scale (adjusted) Pri-2012 table with MP - 2019 improvement scale (adjusted) Pri-2012 table with MP- 2021 improvement scale (adjusted) Pri-2012 table with MP - 2020 improvement scale (adjusted) Pri-2012 table with MP - 2019 improvement scale (adjusted) Health care cost trend on covered charges N/A N/A N/A Initial and ultimate rate of 5.00% Initial and ultimate rate of 5.00% Initial and ultimate rate of 5.00% __________ (a) The discount rates above represent the blended rates used to establish the majority of Exelon’s pension and OPEB costs. Certain benefit plans used individual rates, which range from 2.55%-3.24% and 2.84%-3.20% for pension and OPEB plans, respectively, for the year ended December 31, 2022; 2.11%-2.73% and 2.45%-2.63% for pension and OPEB plans; respectively, for the year ended December 31, 2021; and 3.02%-3.44% and 3.27%-3.40% for pension and OPEB plans, respectively, for the year ended December 31, 2020. (b) The investment crediting rate above represents a weighted average rate. (c) Not applicable to pension and OPEB plans that do not have plan assets.
Pension And Other Postretirement Benefit Contributions	The following tables provide contributions to the pension and OPEB plans: Pension Benefits OPEB 2022 2021 2020 2022 2021 2020 Exelon $ 570 $ 343 $ 306 $ 42 $ 63 $ 40 ComEd 176 174 143 8 22 5 PECO 15 17 18 3 1 — BGE 48 57 56 20 24 22 PHI 69 39 30 9 9 9 Pepco 3 2 2 8 9 9 DPL 1 1 — — — — ACE 7 3 2 — — — The following table provides all Registrants' planned contributions to the qualified pension plans, planned benefit payments to non-qualified pension plans, and planned contributions to OPEB plans in 2023: Qualified Pension Plans Non-Qualified Pension Plans OPEB Exelon $ 20 $ 48 $ 47 ComEd 20 3 19 PECO — 1 — BGE — 1 15 PHI — 9 11 Pepco — 1 11 DPL — — — ACE — — —
Schedule of Expected Benefit Payments	Estimated future benefit payments to participants in all of the pension plans and postretirement benefit plans as of December 31, 2022 were: Pension Benefits OPEB 2023 $ 805 $ 152 2024 775 152 2025 789 152 2026 790 152 2027 798 153 2028 through 2032 3,983 744 Total estimated future benefits payments through 2032 $ 7,940 $ 1,505
Defined Benefit Plan Weighted Average Asset Allocations And Target Allocations	Exelon’s pension and OPEB plan target asset allocations as of December 31, 2022 and 2021 were as follows: December 31, 2022 December 31, 2021 Asset Category Pension Benefits OPEB Pension Benefits OPEB Equity securities 28 % 44 % 35 % 44 % Fixed income securities 44 % 41 % 41 % 41 % Alternative investments (a) 28 % 15 % 24 % 15 % Total 100 % 100 % 100 % 100 % __________ (a) Alternative investments include private equity, hedge funds, real estate, and private credit.
Defined Benefit Plan Fair Value Of Plan Assets	The following tables present pension and OPEB plan assets measured and recorded at fair value in Exelon's Consolidated Balance Sheets on a recurring basis and their level within the fair value hierarchy as of December 31, 2022 and 2021: December 31, 2022 December 31, 2021 Level 1 Level 2 Level 3 Not subject to leveling Total Level 1 Level 2 Level 3 Not subject to leveling Total Pension plan assets (a) Cash and cash equivalents $ 200 $ — $ — $ — $ 200 $ 260 $ 91 $ — $ — $ 351 Equities (b) 1,448 — — 782 2,230 2,699 — 2 1,273 3,974 Fixed income: U.S. Treasury and agencies 986 178 — — 1,164 1,002 176 — — 1,178 State and municipal debt — 44 — — 44 — 47 — — 47 Corporate debt (c) — 1,975 12 — 1,987 — 2,523 325 — 2,848 Other (b) — 63 — 744 807 43 161 12 301 517 Fixed income subtotal 986 2,260 12 744 4,002 1,045 2,907 337 301 4,590 Private equity — — — 1,169 1,169 — — — 1,124 1,124 Hedge funds — — — 760 760 — — — 774 774 Real estate — — — 821 821 — — — 760 760 Private credit — — — 658 658 — — 130 603 733 Pension plan assets subtotal 2,634 2,260 12 4,934 9,840 4,004 2,998 469 4,835 12,306 OPEB plan assets (a) Cash and cash equivalents 39 — — — 39 54 41 — — 95 Equities 305 1 — 273 579 387 2 — 324 713 Fixed income: U.S. Treasury and agencies 17 45 — — 62 14 44 — — 58 State and municipal debt — 8 — — 8 — 7 — — 7 Corporate debt (c) — 44 — — 44 — 74 — — 74 Other 161 5 — 187 353 223 4 — 136 363 Fixed income subtotal 178 102 — 187 467 237 129 — 136 502 Hedge funds — — — 120 120 — — — 175 175 Real estate — — — 106 106 — — — 86 86 Private credit — — — 39 39 — — — 84 84 OPEB plan assets subtotal 522 103 — 725 1,350 678 172 — 805 1,655 Total pension and OPEB plan assets (d) $ 3,156 $ 2,363 $ 12 $ 5,659 $ 11,190 $ 4,682 $ 3,170 $ 469 $ 5,640 $ 13,961 __________ (a) See Note 17—Fair Value of Financial Assets and Liabilities for a description of levels within the fair value hierarchy. (b) Includes derivative instruments of $11 million and $(2) million for the years ended December 31, 2022 and 2021, respectively, which have total notional amounts of $3,434 million and $3,481 million as of December 31, 2022 and 2021, respectively. The notional principal amounts for these instruments provide one measure of the transaction volume outstanding as of the fiscal years ended and do not represent the amount of the company’s exposure to credit or market loss. (c) Includes investments in equities sold short held in investment vehicles primarily to hedge the equity option component of its convertible debt. Pension equities sold short totaled $(44) million as of December 31, 2021. OPEB equities sold short totaled $(18) million as of December 31, 2021. There were no individually held investments sold short in 2022. (d) Excludes net liabilities of $318 million and $131 million as of December 31, 2022 and 2021, respectively, which include certain derivative assets that have notional amounts of $69 million and $127 million as of December 31, 2022 and 2021, respectively. These items are required to reconcile to the fair value of net plan assets and consist primarily of receivables or payables related to pending securities sales and purchases, interest and dividends receivable, and repurchase agreement obligations. The repurchase agreements generally have maturities ranging from 3-6 months.
Schedule of Changes in Fair Value of Plan Assets	The following table presents the reconciliation of Level 3 assets and liabilities for Exelon measured at fair value for pension and OPEB plans for the years ended December 31, 2022 and 2021: Fixed Income Equities Private Credit Total Pension Assets Balance as of January 1, 2022 $ 337 $ 2 $ 130 $ 469 Actual return on plan assets: Relating to assets still held as of the (9) — (15) (24) Relating to assets sold during the period (19) — 13 (6) Purchases, sales and settlements: Purchases — — 7 7 Settlements (a) (1) — (52) (53) Transfers out of Level 3 (b) (296) (2) (83) (381) Balance as of December 31, 2022 $ 12 $ — $ — $ 12 Fixed Income Equities Private Credit Total Pension Assets Balance as of January 1, 2021 $ 348 $ 1 $ 136 $ 485 Actual return on plan assets: Relating to assets still held as of the reporting date (12) — 18 6 Purchases, sales and settlements: Purchases 10 — 5 15 Settlements (a) (13) — (29) (42) Transfers into Level 3 4 1 — 5 Balance as of December 31, 2021 $ 337 $ 2 $ 130 $ 469 __________ (a) Represents cash settlements only.
Schedule Of Defined Contributions	The Registrants participate in a 401(k) defined contribution savings plan that is sponsored by Exelon. The plan is qualified under applicable sections of the IRC and allows employees to contribute a portion of their pre-tax and/or after-tax income in accordance with specified guidelines. All Registrants match a percentage of the employee contributions up to certain limits. The following table presents the employer contributions and employer matching contributions to the savings plan for the years ended December 31, 2022, 2021, and 2020: For the Years Ended December 31, Exelon ComEd PECO BGE PHI Pepco DPL ACE 2022 $ 91 $ 39 $ 13 $ 11 14 $ 4 $ 3 $ 2 2021 90 35 12 12 14 4 3 2 2020 95 36 12 13 14 4 3 3

Derivative Financial Instrume_2

Derivative Financial Instruments (Tables)	12 Months Ended
Derivative Financial Instruments (Tables)	Dec. 31, 2022
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Interest Rate Derivatives	Below is a summary of the interest rate hedge balances as of December 31, 2022. Exelon had no interest rate hedge activity in 2021. December 31, 2022 Derivatives Designated Economic Hedges Total Other deferred debits (noncurrent assets) $ 6 $ 5 $ 11 Total derivative assets 6 5 11 Mark-to-market derivative liabilities (current liabilities) — (3) (3) Mark-to-market derivative liabilities (noncurrent liabilities) (4) — (4) Total mark-to-market derivative liabilities (4) (3) (7) Total mark-to-market derivative net assets $ 2 $ 2 $ 4
Derivative Instruments, Gain (Loss)	For the year ended December 31, 2022, Exelon Corporate recognized the following net pre-tax mark-to-market losses which are also recognized in Net fair value changes related to derivatives in Exelon's Consolidated Statements of Cash Flows. Exelon had no swaps for the years ended December 31, 2021 and 2020 . Loss Income Statement Location 2022 Electric operating revenues $ 2 Interest expense 3 Total $ 5

Debt and Credit Agreements (Tab

Debt and Credit Agreements (Tables)	12 Months Ended
Debt and Credit Agreements (Tables)	Dec. 31, 2022
Short-term and Long-term Debt [Line Items]
Schedule of Commercial Paper Borrowings	The following table reflects the Registrants' commercial paper programs supported by the revolving credit agreements and bilateral credit agreements as of December 31, 2022 and 2021: Credit Facility Size Outstanding Commercial Average Interest Rate on Commercial Paper Issuer 2022 (a) 2021 (a) 2022 2021 2022 2021 Exelon (b) $ 4,000 $ 3,700 $ 1,938 $ 599 4.77 % 0.35 % ComEd 1,000 1,000 427 — 4.71 % — % PECO 600 600 239 — 4.71 % — % BGE 600 600 409 130 4.81 % 0.37 % PHI (c) 900 900 414 469 4.78 % 0.35 % Pepco 300 (d) 300 299 175 4.79 % 0.33 % DPL 300 (d) 300 115 149 4.76 % 0.36 % ACE 300 (d) 300 — 145 — % 0.35 % __________ (a) Excludes credit facility agreements arranged at minority and community banks. See below for additional information. (b) Includes revolving credit agreements at Exelon Corporate with a maximum program size of $900 million and $600 million as of December 31, 2022 and December 31, 2021, respectively. Exelon Corporate had $449 million in outstanding commercial paper as of December 31, 2022 and no outstanding commercial paper as of December 31, 2021. (c) Represents the consolidated amounts of Pepco, DPL, and ACE. (d) The standard maximum program size for revolving credit facilities is $300 million each for Pepco, DPL and ACE based on the credit agreements in place. However, the facilities at Pepco, DPL, and ACE have the ability to flex to $500 million, $500 million, and $350 million, respectively. The borrowing capacity may be increased or decreased during the term of the facility, except that (i) the sum of the borrowing capacity must equal the total amount of the facility, and (ii) the aggregate amount of credit used at any given time by each of Pepco, DPL, or ACE may not exceed $900 million or the maximum amount of short-term debt the company is permitted to have outstanding by its regulatory authorities. The total number of the borrowing reallocations may not exceed eight per year during the term of the facility. As of December 23, 2022, this ability was utilized to increase Pepco's program size to $400 million. As a result, the program sizes for DPL and ACE were decreased to $250 million each, which prevents the aggregate amount of outstanding short-term debt from potentially exceeding the $900 million limit.
Schedule of Aggregate Bank Commitments, Credit Facility Borrowings, and Available Capacity	As of December 31, 2022, the Registrants had the following aggregate bank commitments, credit facility borrowings, and available capacity under their respective credit facilities: Available Capacity as of December 31, 2022 Borrower (a) Facility Type Aggregate Bank (b) Facility Draws Outstanding Actual To Support Additional Commercial (c) Exelon (c) Syndicated Revolver $ 4,000 $ — $ 8 $ 3,992 $ 2,054 ComEd Syndicated Revolver 1,000 — 5 995 568 PECO Syndicated Revolver 600 — — 600 361 BGE Syndicated Revolver 600 — — 600 191 PHI (d) Syndicated Revolver 900 — — 900 486 Pepco Syndicated Revolver 300 — — 300 1 DPL Syndicated Revolver 300 — — 300 185 ACE Syndicated Revolver 300 — — 300 300 __________ (a) On February 1, 2022, Exelon Corporate and the Utility Registrants' respective syndicated revolving credit facilities were replaced with a new 5-year revolving credit facility. (b) Excludes credit facility agreements arranged at minority and community banks. See below for additional information. (c) Includes $900 million aggregate bank commitment related to Exelon Corporate. Exelon Corporate had $3 million outstanding letters of credit as of December 31, 2022. Exelon Corporate had $448 million in available capacity to support additional commercial paper as of December 31, 2022. (d) Represents the consolidated amounts of Pepco, DPL, and ACE.
Schedule of Basis Spread	Borrowings under Exelon’s, ComEd’s, PECO’s, BGE's, Pepco's, DPL's, and ACE's revolving credit agreements bear interest at a rate based upon either the prime rate or a SOFR-based rate, plus an adder based upon the particular Registrant’s credit rating. The adders for the prime based borrowings and SOFR-based borrowings are presented in the following table: Exelon (a) ComEd PECO BGE Pepco DPL ACE Prime based borrowings 0 - 27.5 — — — 7.5 — 7.5 SOFR-based borrowings 90.0 - 127.5 100.0 90.0 90.0 107.5 100.0 107.5 __________ (a) Includes interest rate adders at Exelon Corporate of 27.5 basis points and 127.5 basis points for prime and SOFR-based borrowings, respectively.
Schedule of long-term debt instruments	Long-Term Debt The following tables present the outstanding long-term debt at the Registrants as of December 31, 2022 and 2021: Exelon Maturity December 31, Rates 2022 2021 Long-term debt First mortgage bonds (a)(b) 1.05 % - 7.90 % 2023 - 2052 $ 22,651 $ 20,751 Senior unsecured notes 2.75 % - 7.60 % 2025 - 2052 8,324 6,324 Unsecured notes 2.25 % - 6.35 % 2023 - 2052 4,250 4,000 Notes payable and other 1.64 % - 7.49 % 2025 - 2053 86 86 Junior subordinated notes 3.50 % 2022 — 1,150 Long-term software licensing agreement 2.30 % - 3.95 % 2024 - 2025 25 9 Unsecured tax-exempt bonds 4.00 % - 4.05 % 2024 33 143 Medium-terms notes (unsecured) 7.72 % 2027 10 10 Loan agreement 2.00 % 5.15 % 2023 - 2024 1,400 50 Total long-term debt 36,779 32,523 Unamortized debt discount and premium, net (74) (70) Unamortized debt issuance costs (257) (220) Fair value adjustment 626 669 Long-term debt due within one year (c) (1,802) (2,153) Long-term debt $ 35,272 $ 30,749 Long-term debt to financing trusts (d) Subordinated debentures to ComEd Financing III 6.35 % 2033 $ 206 $ 206 Subordinated debentures to PECO Trust III 7.38 % - 9.50 % 2028 81 81 Subordinated debentures to PECO Trust IV 5.75 % 2033 103 103 Total long-term debt to financing trusts $ 390 $ 390 __________ (a) Substantially all of ComEd’s assets other than expressly excepted property and substantially all of PECO’s, Pepco's, DPL's, and ACE's assets are subject to the liens of their respective mortgage indentures. (b) On January 3, 2023, ComEd entered into a purchase agreement of First Mortgage Bonds of $400 million and $575 million at 4.90% and 5.30% due on February 1, 2033 and February 1, 2053, respectively. The closing date of the issuance occurred on January 10, 2023. (c) In connection with the separation, Exelon Corporate entered into three 18-month term loan agreements. On January 21, 2022, two of the loan agreements were issued for $300 million each with an expiration date of July 21, 2023. On January 24, 2022, the third loan agreement was issued for $250 million with an expiration date of July 24, 2023. Pursuant to the loan agreement, loans made thereunder bear interest at a variable rate equal to SOFR plus 0.65%. (d) Amounts owed to these financing trusts are recorded as Long-term debt to financing trusts within Exelon’s Consolidated Balance Sheets. ComEd Maturity December 31, Rates 2022 2021 Long-term debt First mortgage bonds (a)(b) 2.20 % - 6.45 % 2024 - 2052 $ 10,629 $ 9,879 Other 7.49 % 2053 8 8 Total long-term debt 10,637 9,887 Unamortized debt discount and premium, net (27) (27) Unamortized debt issuance costs (92) (87) Long-term debt $ 10,518 $ 9,773 Long-term debt to financing trust (c) Subordinated debentures to ComEd Financing III 6.35 % 2033 $ 206 $ 206 Total long-term debt to financing trusts 206 206 Unamortized debt issuance costs (1) (1) Long-term debt to financing trusts $ 205 $ 205 __________ (a) Substantially all of ComEd’s assets, other than expressly excepted property, are subject to the lien of its mortgage indenture. (b) On January 3, 2023, ComEd entered into a purchase agreement of First Mortgage Bonds of $400 million and $575 million at 4.90% and 5.30% due on February 1, 2033 and February 1, 2053, respectively. The closing date of the issuance occurred on January 10, 2023. (c) Amount owed to this financing trust is recorded as Long-term debt to financing trust within ComEd’s Consolidated Balance Sheets. PECO Maturity December 31, Rates 2022 2021 Long-term debt First mortgage bonds (a) 2.80 % - 5.95 % 2025 - 2052 $ 4,625 $ 4,200 Loan agreement 2.00 % 2023 50 50 Total long-term debt 4,675 4,250 Unamortized debt discount and premium, net (24) (20) Unamortized debt issuance costs (39) (33) Long-term debt due within one year (50) (350) Long-term debt $ 4,562 $ 3,847 Long-term debt to financing trusts (b) Subordinated debentures to PECO Trust III 7.38 % - 9.50 % 2028 $ 81 $ 81 Subordinated debentures to PECO Trust IV 5.75 % 2033 103 103 Long-term debt to financing trusts $ 184 $ 184 __________ (a) Substantially all of PECO’s assets are subject to the lien of its mortgage indenture. (b) Amounts owed to this financing trust are recorded as Long-term debt to financing trusts within PECO’s Consolidated Balance Sheets. BGE Maturity December 31, Rates 2022 2021 Long-term debt Unsecured notes 2.25 % - 6.35 % 2023 - 2052 $ 4,250 $ 4,000 Total long-term debt 4,250 4,000 Unamortized debt discount and premium, net (13) (12) Unamortized debt issuance costs (30) (27) Long-term debt due within one year (300) (250) Long-term debt $ 3,907 $ 3,711 PHI Maturity December 31, Rates 2022 2021 Long-term debt First mortgage bonds (a) 1.05 % - 7.90 % 2023 - 2052 $ 7,397 $ 6,672 Senior unsecured notes 7.45 % 2032 185 185 Unsecured tax-exempt bonds 4.00 % - 4.05 % 2024 33 143 Medium-terms notes (unsecured) 7.72 % 2027 10 10 Finance leases 5.59 % 2025 - 2030 76 74 Other (b) 7.28 % - 7.49 % 2022 — — Total long-term debt 7,701 7,084 Unamortized debt discount and premium, net 4 4 Unamortized debt issuance costs (47) (36) Fair value adjustment 462 495 Long-term debt due within one year (591) (399) Long-term debt $ 7,529 $ 7,148 _________ (a) Substantially all of Pepco's, DPL's, and ACE's assets are subject to the liens of their respective mortgage indentures. (b) The amount in the Other category was zero and less than $1 million as of December 31, 2022 and December 31, 2021, respectively. Pepco Maturity December 31, Rates 2022 2021 Long-term debt First mortgage bonds (a) 2.32 % - 7.90 % 2024 - 2052 $ 3,775 $ 3,350 Unsecured tax-exempt bonds 1.70 % 2022 — 110 Finance leases 5.59 % 2025 - 2029 25 26 Other (b) 7.28 % - 7.49 % 2022 — — Total long-term debt 3,800 3,486 Unamortized debt discount and premium, net 2 2 Unamortized debt issuance costs (51) (43) Long-term debt due within one year (4) (313) Long-term debt $ 3,747 $ 3,132 ________ (a) Substantially all of Pepco's assets are subject to the lien of its mortgage indenture. (b) The amount in the Other category was zero and less than $1 million as of December 31, 2022 and December 31, 2021, respectively. DPL Maturity December 31, Rates 2022 2021 Long-term debt First mortgage bonds (a) 1.05 % - 4.27 % 2023 - 2052 $ 1,874 $ 1,749 Unsecured tax-exempt bonds 4.00 % - 4.05 % 2024 33 33 Medium-terms notes (unsecured) 7.72 % 2027 10 10 Finance leases 5.39 % 2025 - 2030 32 29 Total long-term debt 1,949 1,821 Unamortized debt discount and premium, net (b) — — Unamortized debt issuance costs (11) (11) Long-term debt due within one year (584) (83) Long-term debt $ 1,354 $ 1,727 __________ (a) Substantially all of DPL's assets are subject to the lien of its mortgage indenture. (b) The amount in the Unamortized debt discount and premium, net category was less than $1 million as of December 31, 2022 and 2021. ACE Maturity December 31, Rates 2022 2021 Long-term debt First mortgage bonds (a) 2.25 % - 5.80 % 2024 - 2052 $ 1,748 $ 1,573 Finance leases 5.59 % 2025 - 2030 19 19 Total long-term debt 1,767 1,592 Unamortized debt discount and premium, net (1) (1) Unamortized debt issuance costs (9) (9) Long-term debt due within one year (3) (3) Long-term debt $ 1,754 $ 1,579 __________ (a) Substantially all of ACE's assets are subject to the lien of its mortgage indenture.
Schedule of maturities of long-term debt	Long-term debt maturities at the Registrants in the periods 2023 through 2027 and thereafter are as follows: Year Exelon ComEd PECO BGE PHI Pepco DPL ACE 2023 $ 1,802 $ — $ 50 $ 300 $ 591 $ 4 $ 584 $ 3 2024 1,317 250 — — 564 405 6 153 2025 1,414 — 350 — 242 5 84 153 2026 1,613 500 — 350 13 4 6 3 2027 1,021 350 — — 21 3 15 3 Thereafter 30,002 (a) 9,743 (b) 4,459 (c) 3,600 6,270 3,379 1,254 1,452 Total $ 37,169 $ 10,843 $ 4,859 $ 4,250 $ 7,701 $ 3,800 $ 1,949 $ 1,767 __________ (a) Includes $390 million due to ComEd and PECO financing trusts. (b) Includes $206 million due to ComEd financing trust. (c) Includes $184 million due to PECO financing trusts.
Community and Minority Facilities [Member]
Short-term and Long-term Debt [Line Items]
Schedule of Aggregate Bank Commitments, Credit Facility Borrowings, and Available Capacity	The following table reflects the Registrants' credit facility agreements arranged at minority and community banks as of December 31, 2022 and 2021. These are excluded from the Maximum Program Size and Aggregate Bank Commitment amounts within the two tables above and the facilities are solely used to issue letters of credit. Aggregate Bank Commitments Outstanding Letters of Credit Borrower 2022 (a) 2021 2022 2021 Exelon (b) $ 140 $ 98 $ 10 $ 8 ComEd 40 33 7 5 PECO 40 33 1 1 BGE 15 8 2 2 PHI (c) 45 24 — — Pepco 15 8 — — DPL 15 8 — — ACE 15 8 — — __________ (a) These facilities were entered into on October 7, 2022 and expire on October 6, 2023. (b) Represents the consolidated amounts of ComEd, PECO, BGE, Pepco, DPL, and ACE. (c) Represents the consolidated amounts of Pepco, DPL, and ACE.
Revolving Credit Facility [Member]
Short-term and Long-term Debt [Line Items]
Schedule of Aggregate Bank Commitments, Credit Facility Borrowings, and Available Capacity	Revolving Credit Agreements On February 1, 2022, Exelon Corporate and the Utility Registrants each entered into a new 5-year revolving credit facility that replaced its existing syndicated revolving credit facility. The following table reflects the credit agreements: Borrower Aggregate Bank Commitment Interest Rate Exelon Corporate $ 900 SOFR plus 1.275 % ComEd 1,000 SOFR plus 1.000 % PECO 600 SOFR plus 0.900 % BGE 600 SOFR plus 0.900 % Pepco 300 SOFR plus 1.075 % DPL 300 SOFR plus 1.000 % ACE 300 SOFR plus 1.075 %

Fair Value of Financial Asset_2

Fair Value of Financial Assets and Liabilities (Tables)	12 Months Ended
Fair Value of Financial Assets and Liabilities (Tables)	Dec. 31, 2022
Fair Value Disclosures [Abstract]
Fair Value of Financial Liabilities Recorded at Amortized Cost	The following tables present the carrying amounts and fair values of the Registrants’ short-term liabilities, long-term debt, and trust preferred securities (long-term debt to financing trusts or junior subordinated debentures) as of December 31, 2022 and 2021. The Registrants have no financial liabilities classified as Level 1 or measured using the NAV practical expedient. The carrying amounts of the Registrants’ short-term liabilities as presented in their Consolidated Balance Sheets are representative of their fair value (Level 2) because of the short-term nature of these instruments. December 31, 2022 December 31, 2021 Carrying Amount Fair Value Carrying Amount Fair Value Level 2 Level 3 Total Level 2 Level 3 Total Long-Term Debt, including amounts due within one year (a) Exelon $ 37,074 $ 29,902 $ 2,327 $ 32,229 $ 32,902 $ 34,897 $ 2,217 $ 37,114 ComEd 10,518 9,006 — 9,006 9,773 11,305 — 11,305 PECO 4,612 3,864 50 3,914 4,197 4,740 50 4,790 BGE 4,207 3,613 — 3,613 3,961 4,406 — 4,406 PHI 8,120 4,507 2,277 6,784 7,547 5,970 2,167 8,137 Pepco 3,751 2,229 1,205 3,434 3,445 3,201 975 4,176 DPL 1,938 1,164 458 1,622 1,810 1,426 552 1,978 ACE 1,757 909 614 1,523 1,582 1,091 641 1,732 Long-Term Debt to Financing Trusts Exelon $ 390 $ — $ 384 $ 384 $ 390 $ — $ 470 $ 470 ComEd 205 — 204 204 205 — 248 248 PECO 184 — 180 180 184 — 222 222 __________ (a) Includes unamortized debt issuance costs, unamortized debt discount and premium, net, purchase accounting fair value adjustments, and finance lease liabilities which are not fair valued. Refer to Note 16 — Debt and Credit Agreements for unamortized debt issuance costs, unamortized debt discount and premium, net, and purchase accounting fair value adjustments and Note 10 — Leases for finance lease liabilities .
Assets and Liabilities Measured and Recorded at Fair Value on Recurring Basis	The following tables present assets and liabilities measured and recorded at fair value in the Registrants' Consolidated Balance Sheets on a recurring basis and their level within the fair value hierarchy as of December 31, 2022 and 2021. The Registrants have no financial assets or liabilities measured using the NAV practical expedient: Exelon As of December 31, 2022 As of December 31, 2021 Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Assets Cash equivalents (a) $ 664 $ — $ — $ 664 $ 524 $ — $ — $ 524 Rabbi trust investments Cash equivalents 62 — — 62 60 — — 60 Mutual funds 49 — — 49 60 — — 60 Fixed income — 7 — 7 — 10 — 10 Life insurance contracts — 58 40 98 — 61 37 98 Rabbi trust investments subtotal 111 65 40 216 120 71 37 228 Interest rate derivative assets Derivatives designated as hedging instruments — 6 — 6 — — — — Economic hedges — 5 — 5 — — — — Interest rate derivative assets subtotal — 11 — 11 — — — — Total assets 775 76 40 891 644 71 37 752 Liabilities Mark-to-market derivative liabilities — — (84) (84) — — (219) (219) Interest rate derivative liabilities Derivatives designated as hedging instruments — (4) — (4) — — — — Economic hedges — (3) — (3) — — — — Interest rate derivative liabilities subtotal — (7) — (7) — — — — Deferred compensation obligation — (75) — (75) — (131) — (131) Total liabilities — (82) (84) (166) — (131) (219) (350) Total net assets (liabilities) $ 775 $ (6) $ (44) $ 725 $ 644 $ (60) $ (182) $ 402 __________ (a) Excludes cash of $345 million and $464 million as of December 31, 2022 and 2021, respectively, and restricted cash of $81 million and $49 million as of December 31, 2022 and 2021, respectively, and includes long-term restricted cash of $117 million and $44 million as of December 31, 2022 and 2021, respectively, which is reported in Other deferred debits in the Consolidated Balance Sheets. ComEd, PECO, and BGE ComEd PECO BGE As of December 31, 2022 Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Assets Cash equivalents (a) $ 392 $ — $ — $ 392 $ 10 $ — $ — $ 10 $ 23 $ — $ — $ 23 Rabbi trust investments Mutual funds — — — — 7 — — 7 7 — — 7 Life insurance contracts — — — — — 15 — 15 — — — — Rabbi trust investments subtotal — — — — 7 15 — 22 7 — — 7 Total assets 392 — — 392 17 15 — 32 30 — — 30 Liabilities Mark-to-market derivative liabilities (b) — — (84) (84) — — — — — — — — Deferred compensation obligation — (8) — (8) — (7) — (7) — (4) — (4) Total liabilities — (8) (84) (92) — (7) — (7) — (4) — (4) Total net assets (liabilities) $ 392 $ (8) $ (84) $ 300 $ 17 $ 8 $ — $ 25 $ 30 $ (4) $ — $ 26 ComEd PECO BGE As of December 31, 2021 Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Assets Cash equivalents (a) $ 237 $ — $ — $ 237 $ 9 $ — $ — $ 9 $ — $ — $ — $ — Rabbi trust investments Mutual funds — — — — 11 — — 11 14 — — 14 Life insurance contracts — — — — — 16 — 16 — — — — Rabbi trust investments subtotal — — — — 11 16 — 27 14 — — 14 Total assets 237 — — 237 20 16 — 36 14 — — 14 Liabilities Mark-to-market derivative liabilities (b) — — (219) (219) — — — — — — — — Deferred compensation obligation — (10) — (10) — (9) — (9) — (7) — (7) Total liabilities — (10) (219) (229) — (9) — (9) — (7) — (7) Total net assets (liabilities) $ 237 $ (10) $ (219) $ 8 $ 20 $ 7 $ — $ 27 $ 14 $ (7) $ — $ 7 __________ (a) ComEd excludes cash of $42 million and $105 million as of December 31, 2022 and 2021, respectively, and restricted cash of $77 million and $42 million as of December 31, 2022 and 2021, respectively, and includes long-term restricted cash of $117 million and $43 million as of December 31, 2022 and 2021, respectively, which is reported in Other deferred debits in the Consolidated Balance Sheets. PECO excludes cash of $58 million and $35 million as of December 31, 2022 and 2021, respectively. BGE excludes cash of $43 million and $51 million as of December 31, 2022 and 2021, respectively, and restricted cash of $1 million and $4 million as of December 31, 2022 and 2021, respectively. (b) The Level 3 balance consists of the current and noncurrent liability of $5 million and $79 million, respectively, as of December 31, 2022, and $18 million and $201 million, respectively, as of December 31, 2021 related to floating-to-fixed energy swap contracts with unaffiliated suppliers. PHI, Pepco, DPL, and ACE As of December 31, 2022 As of December 31, 2021 PHI Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Assets Cash equivalents (a) $ 205 $ — $ — $ 205 $ 110 $ — $ — $ 110 Rabbi trust investments Cash equivalents 59 — — 59 59 — — 59 Mutual funds 11 — — 11 14 — — 14 Fixed income — 7 — 7 — 10 — 10 Life insurance contracts — 22 39 61 — 27 35 62 Rabbi trust investments subtotal 70 29 39 138 73 37 35 145 Total assets 275 29 39 343 183 37 35 255 Liabilities Deferred compensation obligation — (14) — (14) — (18) — (18) Total liabilities — (14) — (14) — (18) — (18) Total net assets $ 275 $ 15 $ 39 $ 329 $ 183 $ 19 $ 35 $ 237 Pepco DPL ACE As of December 31, 2022 Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Assets Cash equivalents (a) $ 51 $ — $ — $ 51 $ 121 $ — $ — $ 121 $ 1 $ — $ — $ 1 Rabbi trust investments Cash equivalents 59 — — 59 — — — — — — — — Life insurance contracts — 22 38 60 — — — — — — — — Rabbi trust investments subtotal 59 22 38 119 — — — — — — — — Total assets 110 22 38 170 121 — — 121 1 — — 1 Liabilities Deferred compensation obligation — (1) — (1) — — — — — — — — Total liabilities — (1) — (1) — — — — — — — — Total net assets $ 110 $ 21 $ 38 $ 169 $ 121 $ — $ — $ 121 $ 1 $ — $ — $ 1 Pepco DPL ACE As of December 31, 2021 Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Assets Cash equivalents (a) $ 31 $ — $ — $ 31 $ 43 $ — $ — $ 43 $ — $ — $ — $ — Rabbi trust investments Cash equivalents 58 — — 58 — — — — — — — — Life insurance contracts — 27 35 62 — — — — — — — — Rabbi trust investments subtotal 58 27 35 120 — — — — — — — — Total assets 89 27 35 151 43 — — 43 — — — — Liabilities Deferred compensation obligation — (2) — (2) — — — — — — — — Total liabilities — (2) — (2) — — — — — — — — Total net assets $ 89 $ 25 $ 35 $ 149 $ 43 $ — $ — $ 43 $ — $ — $ — $ — __________ (a) PHI excludes cash of $165 million and $100 million as of December 31, 2022 and 2021, respectively, and restricted cash of $3 million and $3 million as of December 31, 2022 and 2021, respectively. Pepco excludes cash of $45 million and $34 million as of December 31, 2022 and 2021, respectively, and restricted cash of $3 million and $3 million as of December 31, 2022 and 2021, respectively. DPL excludes cash of $31 million and $28 million as of December 31, 2022 and 2021, respectively. ACE excludes cash of $71 million and $29 million as of December 31, 2022 and 2021, respectively.
Fair Value Reconciliation of Level 3 Assets and Liabilities Measured at Fair Value on a Recurring Basis	The following tables present the fair value reconciliation of Level 3 assets and liabilities measured at fair value on a recurring basis during the years ended December 31, 2022 and 2021: Exelon ComEd PHI and Pepco For the year ended December 31, 2022 Total Mark-to-Market Life Insurance Contracts Balance as of December 31, 2021 $ (182) $ (219) $ 35 Total realized / unrealized gains (losses) Included in net income (a) 5 — 5 Included in regulatory assets/liabilities 135 135 (b) — Purchases, sales, and settlements Settlements — — — Transfers out of Level 3 (2) — — Balance as of December 31, 2022 $ (44) $ (84) (c) $ 40 The amount of total gains included in income attributed to the change in unrealized gains (losses) related to assets and liabilities as of December 31, 2022 5 $ — $ 5 Exelon ComEd PHI and Pepco For the year ended December 31, 2021 Total Mark-to-Market Life Insurance Contracts Balance as of December 31, 2020 $ (267) $ (301) $ 34 Total realized / unrealized gains (losses) Included in net income (a) 3 — 3 Included in regulatory assets/liabilities 82 82 (b) — Purchases, sales, and settlements Settlements (2) — (2) Transfers into Level 3 2 — — Balance as of December 31, 2021 $ (182) $ (219) $ 35 The amount of total gains included in income attributed to the change in unrealized gains (losses) related to assets and liabilities as of December 31, 2021 $ 3 $ — $ 3 __________ (a) Classified in Operating and maintenance expense in the Consolidated Statements of Operations and Comprehensive Income. (b) Includes $136 million of increases in fair value and a decrease for realized losses due to settlements of $1 million recorded in purchased power expense associated with floating-to-fixed energy swap contracts with unaffiliated suppliers for the year ended December 31, 2022. Includes $62 million of increases in fair value and an increase for realized losses due to settlements of $20 million recorded in purchased power expense associated with floating-to-fixed energy swap contracts with unaffiliated suppliers for the year ended December 31, 2021. (c) The balance of the current and noncurrent asset was effectively zero as of December 31, 2022. The balance consists of a current and noncurrent liability of $5 million and $79 million, respectively, as of December 31, 2022.
Fair Value Reconciliation of Level 3 Assets and Liabilities Measured at Fair Value on a Recurring Basis, Valuation Technique	The following table discloses the significant unobservable inputs to the forward curve used to value mark-to-market derivatives: Type of trade Fair Value as of December 31, 2022 Fair Value as of December 31, 2021 Valuation Unobservable 2022 Range & Arithmetic Average 2021 Range & Arithmetic Average Mark-to-market derivatives $ (84) $ (219) Discounted Cash Flow Forward power price (a) $ 34.78 - $ 75.71 $ 48.44 $ 28.65 - $ 47.10 $ 33.96 __________ (a) An increase to the forward power price would increase the fair value.

Commitments and Contingencies_2

Commitments and Contingencies (Tables)	12 Months Ended
Commitments and Contingencies (Tables)	Dec. 31, 2022
Commitments and Contingencies Disclosure [Abstract]
PHI Merger Commitments [Table Text Block]	The following amounts represent total commitment costs that have been recorded since the acquisition date and the total remaining obligations for Exelon, PHI, Pepco, DPL, and ACE as of December 31, 2022: Description Exelon PHI Pepco DPL ACE Total commitments $ 513 $ 320 $ 120 $ 89 $ 111 Remaining commitments (a) 52 45 39 4 2 __________ (a) Remaining commitments extend through 2026 and include rate credits, energy efficiency programs, and delivery system modernization.
Commercial Commitments	The Registrants' commercial commitments as of December 31, 2022, representing commitments potentially triggered by future events were as follows: Expiration within Exelon Total 2023 2024 2025 2026 2027 2028 and beyond Letters of credit $ 19 $ 17 $ 2 $ — $ — $ — $ — Surety bonds (a) 205 203 2 — — — — Financing trust guarantees 378 — — — — — 378 Guaranteed lease residual values (b) 29 — 6 6 5 4 8 Total commercial commitments $ 631 $ 220 $ 10 $ 6 $ 5 $ 4 $ 386 ComEd Letters of credit $ 12 $ 10 $ 2 $ — $ — $ — $ — Surety bonds (a) 46 44 2 — — — — Financing trust guarantees 200 — — — — — 200 Total commercial commitments $ 258 $ 54 $ 4 $ — $ — $ — $ 200 PECO Letters of credit $ 1 $ 1 $ — $ — $ — $ — $ — Surety bonds (a) 2 2 — — — — — Financing trust guarantees 178 — — — — — 178 Total commercial commitments $ 181 $ 3 $ — $ — $ — $ — $ 178 BGE Letters of credit $ 2 $ 2 $ — $ — $ — $ — $ — Surety bonds (a) 2 2 — — — — — Total commercial commitments $ 4 $ 4 $ — $ — $ — $ — $ — PHI Surety bonds (a) $ 96 $ 96 $ — $ — $ — $ — $ — Guaranteed lease residual values (b) 29 — 6 6 5 4 8 Total commercial commitments $ 125 $ 96 $ 6 $ 6 $ 5 $ 4 $ 8 Pepco Surety bonds (a) $ 84 $ 84 $ — $ — $ — $ — $ — Guaranteed lease residual values (b) 10 — 2 2 2 1 3 Total commercial commitments $ 94 $ 84 $ 2 $ 2 $ 2 $ 1 $ 3 DPL Surety bonds (a) $ 7 $ 7 $ — $ — $ — $ — $ — Guaranteed lease residual values (b) 12 — 3 2 2 2 3 Total commercial commitments $ 19 $ 7 $ 3 $ 2 $ 2 $ 2 $ 3 ACE Surety bonds (a) $ 5 $ 5 $ — $ — $ — $ — $ — Guaranteed lease residual values (b) 7 — 1 2 1 1 2 Total commercial commitments $ 12 $ 5 $ 1 $ 2 $ 1 $ 1 $ 2 __________ (a) Surety bonds—Guarantees issued related to contract and commercial agreements, excluding bid bonds. (b) Represents the maximum potential obligation in the event that the fair value of certain leased equipment and fleet vehicles is zero at the end of the maximum lease term. The lease term associated with these assets ranges from 1 to 8 years. The maximum potential obligation at the end of the minimum lease term would be $68 million guaranteed by Exelon and PHI, of which $22 million , $28 million, and $18 million is guaranteed by Pepco, DPL, and ACE, respectively. Historically, payments under the guarantees have not been made and PHI believes the likelihood of payments being required under the guarantees is remote.
Accrued environmental liabilities	As of December 31, 2022 and 2021, the Registrants had accrued the following undiscounted amounts for environmental liabilities in Accrued expenses, Other current liabilities, and Other deferred credits and other liabilities in their respective Consolidated Balance Sheets: December 31, 2022 December 31, 2021 Total environmental Portion of total related to Total environmental Portion of total related to Exelon $ 409 $ 355 $ 352 $ 303 ComEd 325 324 279 279 PECO 25 23 22 20 BGE 9 8 6 4 PHI 46 — 42 — Pepco 44 — 40 — DPL 1 — 1 — ACE 1 — 1 —

Shareholders' Equity (Tables)

Shareholders' Equity (Tables)	12 Months Ended
Shareholders' Equity (Tables)	Dec. 31, 2022
Equity [Abstract]
Common Stock Warrants [Table Text Block]	The following table presents warrants outstanding to purchase ComEd common stock and shares of common stock reserved for the conversion of warrants. The warrants entitle the holders to convert such warrants into common stock of ComEd at a conversion rate of one share of common stock for three warrants. December 31, 2022 2021 Warrants outstanding 60,052 60,061 Common Stock reserved for conversion 20,017 20,020
Preferred Stock [Table Text Block]	The following table presents Exelon, ComEd, PECO, BGE, Pepco, and ACE's shares of preferred securities authorized, none of which were outstanding, as of December 31, 2022 and 2021. There are no shares of preferred securities authorized for DPL. Preferred Securities Authorized Exelon 100,000,000 ComEd 850,000 PECO 15,000,000 BGE 1,000,000 Pepco 6,000,000 ACE (a) 2,799,979 _________ (a) Includes 799,979 shares of cumulative preferred stock and 2,000,000 of no-par preferred stock as of December 31, 2022 and 2021.
Preference Securities [Table Text Block]	The following table presents ComEd's, BGE's, and ACE's preference securities authorized, none of which were outstanding as of December 31, 2022 and 2021. There are no shares of preference securities authorized for Exelon, PECO, Pepco, and DPL. Preference Securities Authorized ComEd 6,810,451 BGE (a) 6,500,000 ACE 3,000,000 __________ (a) Includes 4,600,000 shares of unclassified preference securities and 1,900,000 shares of previously redeemed preference securities as of December 31, 2022 and 2021.

Stock-Based Compensation Plan_2

Stock-Based Compensation Plans Stock-Based Compensation Plans (Tables)	12 Months Ended
	Dec. 31, 2022
Share-Based Payment Arrangement [Abstract]
Share-based Payment Arrangement, Cost by Plan [Table Text Block]	The following table presents the stock-based compensation expense included in Exelon's Consolidated Statements of Operations and Comprehensive Income. The Utility Registrants' stock-based compensation expense for the years ended December 31, 2022, 2021, and 2020 was not material. Year Ended December 31, Exelon 2022 2021 2020 Total stock-based compensation expense included in operating and maintenance expense $ 41 $ 95 $ 37 Income tax benefit (10) (25) (9) Total after-tax stock-based compensation expense $ 31 $ 70 $ 28
Stock Based Compensation Tax Benefit	The following table presents information regarding Exelon’s realized tax benefit when distributed: Year Ended December 31, 2022 2021 2020 Performance share awards $ 6 $ 6 $ 15 Restricted stock units 6 6 8
Schedule of Nonvested Performance-based Units Activity	The following table summarizes Exelon’s nonvested performance share awards activity: Shares Weighted Average Nonvested at December 31, 2021 (a) 1,222,516 $ 44.96 Granted 727,697 43.05 Change in performance (216,981) 42.73 Vested (233,318) 47.39 Forfeited (86,128) 42.61 Awards surrendered as a result of the separation (2,308,745) Awards granted in conversion as a result of the separation 1,870,990 Undistributed vested awards (b)(c) (109,226) 4.55 Nonvested at December 31, 2022 (a) 866,805 $ 41.86 __________ (a) Excludes 1,539,819 and 1,934,238 of performance share awards issued to retirement-eligible employees as of December 31, 2022 and 2021, respectively, as they are fully vested. (b) The significant reduction in weighted average grant date fair value during 2022 primarily resulted from more pre-separation shares being surrendered than shares issued to Exelon retirement eligible employees post-separation. (c) Represents performance share awards that vested but were not distributed to retirement-eligible employees during 2022.
Schedule of weighted average grant date fair value	The following table summarizes the weighted average grant date fair value and the total fair value of performance share awards vested. Year Ended December 31, 2022 (a) 2021 2020 Weighted average grant date fair value (per share) $ 43.05 $ 43.37 $ 46.61 Total fair value of performance shares vested 29 44 39 Total fair value of performance shares settled in cash 25 28 63 __________ (a) As of December 31, 2022, $12 million of total unrecognized compensation costs related to nonvested performance shares are expected to be recognized over the remaining weighted-average period of 1.8 years.
Schedule of Nonvested Restricted Stock Units Activity	The following table summarizes Exelon’s nonvested restricted stock unit activity: Shares Weighted Average Nonvested at December 31, 2021 (a) 1,142,049 $ 43.52 Granted 468,514 42.97 Vested (499,621) 42.28 Forfeited (71,816) 41.89 Awards surrendered as a result of the separation (943,509) Awards granted in conversion as a result of the separation 643,994 Undistributed vested awards (b) (178,450) 38.24 Nonvested at December 31, 2022 (a) 561,161 $ 41.98 __________ (a) Excludes 476,592 and 609,934 of restricted stock units issued to retirement-eligible employees as of December 31, 2022 and 2021, respectively, as they are fully vested. (b) Represents restricted stock units that vested but were not distributed to retirement-eligible employees during 2022.
Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity	The following table summarizes the weighted average grant date fair value and the total fair value of restricted stock units vested. Year Ended December 31, 2022 (a) 2021 2020 Weighted average grant date fair value (per share) $ 42.97 $ 44.21 $ 46.33 Total fair value of restricted stock units vested 23 34 54 __________
Schedule of Share-based Compensation, Stock Options, Activity	The following table presents information with respect to stock option activity: Shares Weighted Weighted Aggregate Balance of shares outstanding at December 31, 2021 27,007 $ 46.47 0.15 $ — Options exercised (27,644) 38.56 — Options expired — — Awards surrendered as a result of the separation (2,000) Awards granted in conversion as a result of the separation 2,637 Balance of shares outstanding at December 31, 2022 — $ — 0 $ — Exercisable at December 31, 2022 — $ — 0 $ —
Stock Options Exercised	The following table summarizes additional information regarding stock options exercised: Year Ended December 31, 2022 2021 2020 Intrinsic value (a) $ — $ 11 $ 5 Cash received for exercise price 1 37 18 __________ (a) The difference between the market value on the date of exercise and the option exercise price.

Changes in Accumulated Other _2

Changes in Accumulated Other Comprehensive Income (Tables)	12 Months Ended
Changes in Accumulated Other Comprehensive Income (Tables)	Dec. 31, 2022
Equity [Abstract]
Schedule Of Changes In Accumulated Other Comprehensive Income (Loss)	The following tables present changes in Exelon's AOCI, net of tax, by component: Cash Flow Pension and (a) Foreign Total Balance at December 31, 2019 $ (2) $ (3,165) $ (27) $ (3,194) OCI before reclassifications (3) (357) 4 (356) Amounts reclassified from AOCI — 150 — 150 Net current-period OCI (3) (207) 4 (206) Balance at December 31, 2020 $ (5) $ (3,372) $ (23) $ (3,400) OCI before reclassifications (1) 432 — 431 Amounts reclassified from AOCI — 219 — 219 Net current-period OCI (1) 651 — 650 Balance at December 31, 2021 $ (6) $ (2,721) $ (23) $ (2,750) Separation of Constellation 6 1,994 23 2,023 OCI before reclassifications 2 46 — 48 Amounts reclassified from AOCI — 41 — 41 Net current-period OCI 2 87 — 89 Balance at December 31, 2022 $ 2 $ (640) $ — $ (638) __________
Schedule of Income Taxes Allocated to Other Comprehensive Income (Loss) Components	The following table presents income tax benefit (expense) allocated to each component of Exelon's other comprehensive income (loss): For the Years Ended December 31, 2022 2021 2020 Pension and non-pension postretirement benefit plans: Prior service benefit reclassified to periodic benefit cost $ — $ 4 $ 16 Actuarial loss reclassified to periodic benefit cost (14) (76) (66) Pension and non-pension postretirement benefit plans valuation adjustment (14) (153) 122

Supplemental Financial Inform_2

Supplemental Financial Information (Tables)	12 Months Ended
Supplemental Financial Information (Tables)	Dec. 31, 2022
Supplemental Financial Information [Abstract]
Taxes Other Than Income Taxes	The following tables provide additional information about material items recorded in the Registrants' Consolidated Statements of Operations and Comprehensive Income. Taxes other than income taxes Exelon ComEd PECO BGE PHI Pepco DPL ACE For the year ended December 31, 2022 Utility (a) $ 878 $ 306 $ 166 $ 94 $ 312 $ 283 $ 25 $ 4 Property 377 31 17 191 138 94 42 2 Payroll 117 28 16 17 25 6 4 3 For the year ended December 31, 2021 Utility (a) $ 774 $ 246 $ 139 $ 88 $ 301 $ 278 $ 22 $ 3 Property 364 39 18 176 131 88 40 3 Payroll 124 27 16 18 27 7 5 3 For the year ended December 31, 2020 Utility (a) $ 759 $ 238 $ 135 $ 87 $ 299 $ 275 $ 21 $ 3 Property 336 30 16 164 126 84 39 3 Payroll 121 27 16 17 25 7 5 3 __________ (a) The Registrants’ utility taxes represents municipal and state utility taxes and gross receipts taxes related to their operating revenues. The offsetting collection of utility taxes from customers is recorded in revenues in the Registrants’ Consolidated Statements of Operations and Comprehensive Income.
Schedule of Other Nonoperating Income, by Component	Other, net Exelon ComEd PECO BGE PHI Pepco DPL ACE For the year ended December 31, 2022 AFUDC—Equity $ 150 $ 35 $ 31 $ 21 $ 63 $ 48 $ 7 $ 8 Non-service net periodic benefit cost 63 — — — — — — — For the year ended December 31, 2021 AFUDC—Equity $ 136 $ 34 $ 26 $ 27 $ 49 $ 40 $ 6 $ 3 Non-service net periodic benefit cost 91 — — — — — — — For the year ended December 31, 2020 AFUDC—Equity $ 104 $ 29 $ 17 $ 22 $ 36 $ 28 $ 4 $ 4 Non-service net periodic benefit cost 53 — — — — — — —
Cash Flow Supplemental Disclosures	The following tables provide additional information about material items recorded in the Registrants' Consolidated Statements of Cash Flows. Depreciation, amortization, and accretion Exelon (a) ComEd PECO BGE PHI Pepco DPL ACE For the year ended December 31, 2022 Property, plant, and equipment (b) $ 2,690 $ 1,031 $ 359 $ 476 $ 680 $ 288 $ 191 $ 173 Amortization of regulatory assets (b) 718 292 14 154 258 129 41 88 Amortization of intangible assets, net (b) 12 — — — — — — — Amortization of energy contract assets and liabilities (c) 3 — — — — — — — Nuclear fuel (d) 66 — — — — — — — ARO accretion (e) 44 — — — — — — — Total depreciation, amortization, and accretion $ 3,533 $ 1,323 $ 373 $ 630 $ 938 $ 417 $ 232 $ 261 For the year ended December 31, 2021 Property, plant, and equipment (b) $ 5,384 $ 970 $ 336 $ 439 $ 627 $ 274 $ 169 $ 155 Amortization of regulatory assets (b) 594 235 12 152 194 129 41 24 Amortization of intangible assets, net (b) 58 — — — — — — — Amortization of energy contract assets and liabilities (c) 31 — — — — — — — Nuclear fuel (d) 992 — — — — — — — ARO accretion (e) 514 — — — — — — — Total depreciation, amortization, and accretion $ 7,573 $ 1,205 $ 348 $ 591 $ 821 $ 403 $ 210 $ 179 For the year ended December 31, 2020 Property, plant, and equipment (b) $ 4,364 $ 922 $ 319 $ 397 $ 586 $ 257 $ 155 $ 140 Amortization of regulatory assets (b) 588 211 28 153 196 120 36 40 Amortization of intangible assets, net (b) 62 — — — — — — — Amortization of energy contract assets and liabilities (c) 30 — — — — — — — Nuclear fuel (d) 983 — — — — — — — ARO accretion (e) 500 — — — — — — — Total depreciation, amortization, and accretion $ 6,527 $ 1,133 $ 347 $ 550 $ 782 $ 377 $ 191 $ 180 __________ (a) Exelon's amounts include amounts related to Generation prior to the separation. See Note 2 — Discontinued Operations for additional information. (b) Included in Depreciation and amortization in the Registrants' Consolidated Statements of Operations and Comprehensive Income. (c) Included in Electric operating revenues or Purchased power expense in Exelon’s Consolidated Statements of Operations and Comprehensive Income. (d) Included in Purchased fuel expense in Exelon’s Consolidated Statements of Operations and Comprehensive Income. (e) Included in Operating and maintenance expense in Exelon's Consolidated Statements of Operations and Comprehensive Income. Cash paid (refunded) during the year: Exelon (a) ComEd PECO BGE PHI Pepco DPL ACE For the year ended December 31, 2022 Interest (net of amount capitalized) $ 1,434 $ 396 $ 166 $ 147 $ 274 $ 141 $ 63 $ 60 Income taxes (net of refunds) 73 23 31 16 19 28 (2) (6) For the year ended December 31, 2021 Interest (net of amount capitalized) $ 1,505 $ 372 $ 152 $ 134 $ 255 $ 132 $ 59 $ 56 Income taxes (net of refunds) 281 (72) (4) (38) — 12 (9) 2 For the year ended December 31, 2020 Interest (net of amount capitalized) $ 1,521 $ 371 $ 144 $ 125 $ 257 $ 129 $ 61 $ 57 Income taxes (net of refunds) 10 (61) (37) (57) 46 40 12 (3) __________ (a) Exelon's amounts include amounts related to Generation prior to the separation. See Note 2 — Discontinued Operations for additional information. Other non-cash operating activities: Exelon (a) ComEd PECO BGE PHI Pepco DPL ACE For the year ended December 31, 2022 Pension and non-pension postretirement benefit costs $ 164 $ 60 $ (9) $ 44 $ 53 $ 9 $ 3 $ 12 Allowance for credit losses 173 46 45 25 58 29 12 16 Other decommissioning-related activity 36 — — — — — — — Energy-related options 60 — — — — — — — True-up adjustments to decoupling mechanisms and formula rates (b) (168) (267) (2) 47 54 31 7 16 Long-term incentive plan 42 — — — — — — — Amortization of operating ROU asset 56 2 — 14 27 7 8 3 AFUDC - Equity (150) (35) (31) (21) (63) (48) (7) (8) For the year ended December 31, 2021 Pension and non-pension postretirement benefit costs $ 411 $ 129 $ 8 $ 61 $ 49 $ 6 $ 2 $ 11 Allowance for credit losses 160 47 39 17 24 9 5 10 Other decommissioning-related activity (946) — — — — — — — Energy-related options 125 — — — — — — — True-up adjustments to decoupling mechanisms and formula rates (b) (171) (42) (26) (12) (91) (53) (14) (24) Severance costs (57) 2 — — 1 — — — Long-term incentive plan 137 — — — — — — — Amortization of operating ROU asset 183 1 — 29 28 6 8 4 AFUDC - Equity (136) (34) (26) (27) (49) (40) (6) (3) For the year ended December 31, 2020 Pension and non-pension postretirement benefit costs $ 411 $ 114 $ 5 $ 62 $ 70 $ 15 $ 7 $ 14 Allowance for credit losses 150 32 42 15 43 24 16 2 Other decommissioning-related activity (659) — — — — — — — Energy-related options 104 — — — — — — — True-up adjustments to decoupling mechanisms and formula rates (c) (6) 47 (16) (16) (21) (40) 7 12 Severance costs 105 1 1 — — — — — Provision for excess and obsolete inventory 131 2 1 — — — — — Long-term incentive plan 56 — — — — — — — Amortization of operating ROU Asset 222 2 1 31 28 7 8 3 Asset impairments — 15 — — 13 — 7 6 AFUDC - Equity (104) (29) (17) (22) (36) (28) (4) (4) __________ (a) Exelon's amounts include amounts related to Generation prior to the separation. See Note 2 — Discontinued Operations for additional information. (b) For ComEd, reflects the true-up adjustments in regulatory assets and liabilities associated with its distribution, energy efficiency, distributed generation, and transmission formula rates. For PECO, reflects the change in regulatory assets and liabilities associated with its transmission formula rate. For BGE, Pepco, DPL, and ACE, reflects the change in regulatory assets and liabilities associated with their decoupling mechanisms and transmission formula rates. See Note 3 — Regulatory Matters for additional information. (c) For ComEd, reflects the true-up adjustments in regulatory assets and liabilities associated with its distribution, energy efficiency, distributed generation, and transmission formula rates. For BGE, Pepco, and DPL, reflects the change in regulatory assets and liabilities associated with their decoupling mechanisms and transmission formula rates. For PECO and ACE, reflects the change in regulatory assets and liabilities associated with their transmission formula rates. See Note 3 — Regulatory Matters for additional information The following tables provide a reconciliation of cash, restricted cash, and cash equivalents reported within the Registrants' Consolidated Balance Sheets that sum to the total of the same amounts in their Consolidated Statements of Cash Flows. Exelon ComEd PECO BGE PHI Pepco DPL ACE December 31, 2022 Cash and cash equivalents $ 407 $ 67 $ 59 $ 43 $ 198 $ 45 $ 31 $ 72 Restricted cash and cash equivalents 566 327 9 24 175 54 121 — Restricted cash included in other long-term assets 117 117 — — — — — — Total cash, restricted cash, and cash equivalents $ 1,090 $ 511 $ 68 $ 67 $ 373 $ 99 $ 152 $ 72 December 31, 2021 Cash and cash equivalents $ 672 $ 131 $ 36 $ 51 $ 136 $ 34 $ 28 $ 29 Restricted cash and cash equivalents 321 210 8 4 77 34 43 — Restricted cash included in other long-term assets 44 43 — — — — — — Cash, restricted cash, and cash equivalents included in current assets of discontinued operations 582 — — — — — — — Total cash, restricted cash, and cash equivalents $ 1,619 $ 384 $ 44 $ 55 $ 213 $ 68 $ 71 $ 29 December 31, 2020 Cash and cash equivalents $ 432 $ 83 $ 19 $ 144 $ 111 $ 30 $ 15 $ 17 Restricted cash and cash equivalents 349 279 7 1 39 35 — 3 Restricted cash included in other long-term assets 53 43 — — 10 — — 10 Cash, restricted cash, and cash equivalents included in current assets of discontinued operations 332 — — — — — — — Total cash, restricted cash, and cash equivalents $ 1,166 $ 405 $ 26 $ 145 $ 160 $ 65 $ 15 $ 30 December 31, 2019 Cash and cash equivalents $ 587 $ 90 $ 21 $ 24 $ 131 $ 30 $ 13 $ 12 Restricted cash and cash equivalents 358 150 6 1 36 33 — 2 Restricted cash included in other long-term assets 177 163 — — 14 — — 14 Total cash, restricted cash, and cash equivalents (a) $ 1,122 $ 403 $ 27 $ 25 $ 181 $ 63 $ 13 $ 28 __________ (a) Exelon's amounts include amounts related to Generation prior to the separation. See Note 2 — Discontinued Operations for additional information.
Supplemental Balance Sheet Disclosures	The following tables provide additional information about material items recorded in the Registrants' Consolidated Balance Sheets. Investments Exelon ComEd PECO BGE PHI Pepco December 31, 2022 Equity method investments: Other equity method investments $ 16 $ 6 $ 8 $ — $ — $ — Other investments: Employee benefit trusts and investments (a) 216 — 22 7 138 119 Total investments $ 232 $ 6 $ 30 $ 7 $ 138 $ 119 December 31, 2021 Equity method investments: Other equity method investments $ 15 $ 6 $ 7 $ — $ — $ — Other investments: Employee benefit trusts and investments (a) 235 — 27 14 145 120 Total investments $ 250 $ 6 $ 34 $ 14 $ 145 $ 120 __________ (a) The Registrants’ debt and equity security investments are recorded at fair market value. Accrued expenses Exelon ComEd PECO BGE PHI Pepco DPL ACE December 31, 2022 Compensation-related accruals (a) $ 613 $ 179 $ 81 $ 79 $ 104 $ 29 $ 20 $ 16 Taxes accrued 211 92 10 34 70 52 8 12 Interest accrued 338 124 47 42 61 32 9 14 December 31, 2021 Compensation-related accruals (a) $ 596 $ 155 $ 77 $ 78 $ 113 $ 35 $ 20 $ 17 Taxes accrued 253 94 14 53 96 88 9 11 Interest accrued 297 116 41 44 52 28 8 11 __________ (a) Primarily includes accrued payroll, bonuses and other incentives, vacation, and benefits.

Related Party Transactions (Tab

Related Party Transactions (Tables)	12 Months Ended
Related Party Transactions (Tables)	Dec. 31, 2022
Related Party Transactions [Abstract]
Schedule of Related Party Transactions [Table Text Block]	The Utility Registrants incurred expenses from transactions with the Generation affiliate as described in the footnotes to the table below prior to separation on February 1, 2022. Such expenses were primarily recorded as Purchased power from affiliates and an immaterial amount recorded as Operating and maintenance expense from affiliates at the Utility Registrants: For the Years Ended December 31, 2022 2021 2020 ComEd (a) $ 59 $ 376 $ 330 PECO (b) 33 196 190 BGE (c) 18 236 315 PHI 51 366 367 Pepco (d) 39 270 279 DPL (e) 10 79 75 ACE (f) 2 17 13 __________ (a) ComEd had an ICC-approved RFP contract with Generation to provide a portion of ComEd’s electric supply requirements. ComEd also purchased RECs and ZECs from Generation. (b) PECO received electric supply from Generation under contracts executed through PECO’s competitive procurement process. In addition, PECO had a ten-year agreement with Generation to sell solar AECs. (c) BGE received a portion of its energy requirements from Generation under its MDPSC-approved market-based SOS and gas commodity programs. (d) Pepco received electric supply from Generation under contracts executed through Pepco's competitive procurement process approved by the MDPSC and DCPSC. (e) DPL received a portion of its energy requirements from Generation under its MDPSC and DEPSC approved market-based SOS commodity programs. (f) ACE received electric supply from Generation under contracts executed through ACE's competitive procurement process approved by the NJBPU.
Related Party Transactions - BSC and PHISCO Service Companies [Table Text Block]	The following table presents the service company costs allocated to the Registrants: Operating and maintenance from affiliates Capitalized costs For the years ended December 31, For the years ended December 31, 2022 2021 2020 2022 2021 2020 Exelon BSC $ 707 $ 508 $ 531 PHISCO 80 72 61 ComEd BSC $ 316 $ 304 $ 283 311 207 186 PECO BSC 197 169 150 115 81 76 BGE BSC 204 189 170 122 92 132 PHI BSC 188 168 152 159 128 149 PHISCO — — — 80 72 61 Pepco BSC 110 96 85 60 50 55 PHISCO 112 114 120 33 31 27 DPL BSC 71 61 54 45 43 51 PHISCO 96 99 97 26 22 18 ACE BSC 57 53 45 54 33 40 PHISCO 84 86 87 21 19 16
Related Party Transactions - Current Receivables From/Payables To Affiliates [Table Text Block]	The following tables present current Receivables from affiliates and current Payables to affiliates: December 31, 2022 Receivables from affiliates: Payables to affiliates: ComEd PECO BGE Pepco DPL ACE BSC PHISCO Other Total ComEd $ — $ — $ — $ — $ — $ 66 $ — $ 8 $ 74 PECO $ — — — — — 39 — 3 42 BGE — — — — — 38 — 1 39 PHI — — — — — — 4 — 10 14 Pepco — — — — — 20 13 1 34 DPL — 2 — — — 12 8 — 22 ACE — 2 — — — 14 9 1 26 Other 3 — — — — 1 — — 4 Total $ 3 $ 4 $ — $ — $ — $ 1 $ 193 $ 30 $ 24 $ 255 December 31, 2021 Receivables from affiliates: Payables to affiliates: ComEd PECO BGE Pepco DPL ACE Generation BSC PHISCO Other Total ComEd $ — $ — $ — $ — $ — $ 41 $ 71 $ — $ 9 $ 121 PECO $ — — — — — 30 36 — 4 70 BGE — — — — — 4 41 — 3 48 PHI — 1 — — — 1 — 5 — 9 16 Pepco — — 1 1 1 20 21 12 3 59 DPL — — — — — 4 17 11 1 33 ACE — — — — — 7 13 9 2 31 Generation 13 — — — — — 102 — 16 131 Other 3 — — — — — 11 — — 14 Total $ 16 $ 1 $ 1 $ — $ 1 $ 2 $ 117 $ 306 $ 32 $ 47 $ 523
Related Party Transactions - Long Term Debt to Financing Trusts [Table Text Block]	The following table presents Long-term debt to financing trusts: As of December 31, 2022 2021 Exelon ComEd PECO Exelon ComEd PECO ComEd Financing III $ 206 $ 205 $ — $ 206 $ 205 $ — PECO Trust III 81 — 81 81 — 81 PECO Trust IV 103 — 103 103 — 103 Total $ 390 $ 205 $ 184 $ 390 $ 205 $ 184

Significant Accounting Polici_3

Significant Accounting Policies - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Jan. 01, 2021
Significant Accounting Policies Additional Narrative Information [Line Items]
Retained earnings/Undistributed earnings (losses)	$ 4,597	$ 16,942
Regulatory Liabilities	9,549	10,004
Deferred income taxes and unamortized investment tax credits	11,250	10,611
Net income (loss)	$ 2,171	1,829	$ 1,954
Minimum expectation of tax position to be realized	50%
Corporate, Non-Segment [Member]
Significant Accounting Policies Additional Narrative Information [Line Items]
Retained earnings/Undistributed earnings (losses)	$ 4,597	16,942
Net income (loss)	$ 2,170	$ 1,706	1,963
Commonwealth Edison Company [Member] \| Corporate, Non-Segment [Member]
Significant Accounting Policies Additional Narrative Information [Line Items]
Percentage ownership of consolidated subsidiaries	99%	99%
Exelon Generation Co L L C [Member]
Significant Accounting Policies Additional Narrative Information [Line Items]
Percentage ownership of consolidated subsidiaries		100%
Exelon significant subsidiaries \| Corporate, Non-Segment [Member]
Significant Accounting Policies Additional Narrative Information [Line Items]
Percentage ownership of consolidated subsidiaries	100%	100%
Pepco Holdings LLC [Member]
Significant Accounting Policies Additional Narrative Information [Line Items]
Retained earnings/Undistributed earnings (losses)	$ (352)	$ (210)
Regulatory Liabilities	1,087	1,306
Deferred income taxes and unamortized investment tax credits	2,895	2,675
Net income (loss)	608	$ 561	495
Pepco Holdings LLC [Member] \| Pepco Holdings LLC [Member]
Significant Accounting Policies Additional Narrative Information [Line Items]
Net income (loss)	$ 8
Pepco Holdings LLC [Member] \| Potomac Electric Power Company [Member]
Significant Accounting Policies Additional Narrative Information [Line Items]
Percentage ownership of consolidated subsidiaries	100%	100%
Pepco Holdings LLC [Member] \| Delmarva Power & Light Company [Member]
Significant Accounting Policies Additional Narrative Information [Line Items]
Percentage ownership of consolidated subsidiaries	100%	100%
Pepco Holdings LLC [Member] \| Atlantic City Electric Company [Member]
Significant Accounting Policies Additional Narrative Information [Line Items]
Percentage ownership of consolidated subsidiaries	100%	100%
Atlantic City Electric Company [Member]
Significant Accounting Policies Additional Narrative Information [Line Items]
Retained earnings/Undistributed earnings (losses)	$ (12)	$ (15)
Regulatory Liabilities	182	242
Deferred income taxes and unamortized investment tax credits	734	682
Net income (loss)	$ 148	146	$ 112
Atlantic City Electric Company [Member] \| Atlantic City Electric Company [Member]
Significant Accounting Policies Additional Narrative Information [Line Items]
Retained earnings/Undistributed earnings (losses)				$ 8
Regulatory Liabilities				11
Deferred income taxes and unamortized investment tax credits				$ 3
Net income (loss)		$ 1

Discontinued Operations and Dis

Discontinued Operations and Disposal Groups (Details) - USD ($) $ in Millions	11 Months Ended	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2022	Sep. 30, 2022	Feb. 01, 2022	Jan. 31, 2022
Business Dispositions [Line Items]
Discontinued Operation, Intra-Entity Amounts, Discontinued Operation after Disposal, Expense	$ 266
Exelon Generation Co L L C [Member]
Business Dispositions [Line Items]
Discontinued Operation, Intra-Entity Amounts, Discontinued Operation after Disposal, Expense	43
Net Assets				$ (11,573)
Corporate, Non-Segment [Member]
Business Dispositions [Line Items]
Common Stock, Shares, Issued				326,663,937
Separation Cash Payment					$ 1,750
Proceeds from Sale and Collection of Notes Receivable		$ 258
Corporate, Non-Segment [Member] \| ShortTermDebtSOFRplus075Jan2023
Business Dispositions [Line Items]
Short-Term Loans	1,150	1,150	$ 1,150
Corporate, Non-Segment [Member] \| SMBCTermLoanJuly2023 \| Notes Payable to Banks
Business Dispositions [Line Items]
Debt Instrument, Face Amount	300	300
Corporate, Non-Segment [Member] \| USBTermLoanJuly2023 \| Notes Payable to Banks
Business Dispositions [Line Items]
Debt Instrument, Face Amount	300	300
Corporate, Non-Segment [Member] \| PNCTermLoanJuly2023 \| Notes Payable to Banks
Business Dispositions [Line Items]
Debt Instrument, Face Amount	$ 250	$ 250

Discontinued Operations (Detail

Discontinued Operations (Details) - Income Statement - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Business Dispositions [Line Items]
Operating and maintenance	$ 4,673	$ 4,547	$ 4,641
Depreciation and Amortization	3,325	3,033	2,891
Taxes, Miscellaneous	1,390	1,291	1,232
Costs and Expenses	15,761	15,256	14,485
Other Nonoperating Income (Expense)	535	261	208
Nonoperating Income (Expense)	(912)	(1,028)	(1,099)
Income taxes	349	38	(7)
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	117	213	855
Net income (loss) attributable to noncontrolling interests	1	123	(9)
Net Income (Loss) from Discontinued Operations Available to Common Shareholders, Basic	116	90	864
Total transaction costs relating to the Separation	12
Total transaction and transition costs incurred related to the Separation	52	43	0
Exelon Generation Co L L C [Member]
Business Dispositions [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	1,855	18,466	16,399
Operating revenues from affiliates	161	1,189	1,206
Disposal Group, Including Discontinued Operation, Revenue	2,016	19,655	17,605
Purchased power and/or fuel	1,138	12,163	9,585
Operating and maintenance	371	4,174	4,794
Depreciation and Amortization	94	3,003	2,123
Taxes, Miscellaneous	44	475	482
Costs and Expenses	1,647	19,815	16,984
Gain (Loss) on Disposition of Assets	10	201	11
Disposal Group, Including Discontinued Operation, Operating Income (Loss)	379	41	632
Disposal Group, Including Discontinued Operation, Interest Expense	(20)	(282)	(328)
Other Nonoperating Income (Expense)	(281)	795	937
Nonoperating Income (Expense)	(301)	513	609
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax	78	554	1,241
Income taxes	(40)	332	380
Equity in losses of unconsolidated affiliates	(1)	(9)	(6)
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	117	213	855
Net income (loss) attributable to noncontrolling interests	1	123	(9)
Net Income (Loss) from Discontinued Operations Available to Common Shareholders, Basic	$ 116	$ 90	$ 864

Discontinued Operations (Deta_2

Discontinued Operations (Details) - Balance Sheet - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Business Dispositions [Line Items]
Restricted cash	$ 566	$ 321	$ 349	$ 358
Customer accounts receivable	2,544	2,189
Customer allowance for credit losses	327	320
Other accounts receivable	1,426	1,068
Other allowance for credit losses	(82)	(72)
Other accounts receivable, net	1,344	996
Fossil fuel and emission allowances	208	105
Materials and supplies	547	476
Currents assets of discontinued operations	0	7,835
Accumulated depreciation and amortization	15,930	14,430
Investments	232	250
Other	1,141	885
Property, plant, and equipment, deferred debits, and other assets of discontinued operations	0	38,509
Total assets	95,349	133,013
Short-term Debt	2,586	1,248
Long-term Debt and Lease Obligation, Current	1,802	2,153
Mark-to-market derivative liabilities, current	8	18
Current liabilities of discontinued operations	0	7,940
Long-term Debt, Excluding Current Maturities	35,272	30,749
Deferred income taxes and unamortized investment tax credits	11,250	10,611
Asset retirement obligations, noncurrent	269	271
Derivative Liability, Noncurrent	83	201
Other deferred credits and other liabilities	1,967	1,573
Long-term debt, deferred credits, and other liabilities of discontinued operations	0	25,676
Total liabilities	$ 70,605	98,218
Exelon Generation Co L L C [Member]
Business Dispositions [Line Items]
Disposal Group, Including Discontinued Operation, Cash and Cash Equivalents		510
Restricted cash		72
Customer accounts receivable		1,724
Customer allowance for credit losses		(55)
Disposal Group, Including Discontinued Operation, Accounts, Notes and Loans Receivable, Net		1,669
Other accounts receivable		596
Other allowance for credit losses		(4)
Other accounts receivable, net		592
Mark-to-market derivative assets, current		2,169
Fossil fuel and emission allowances		284
Materials and supplies		1,004
Renewable energy credits, current		529
Disposal Group, Including Discontinued Operations, Assets, Current - Assets held for sale		13
Disposal Group, Including Discontinued Operation, Other Assets, Current		993
Currents assets of discontinued operations		7,835
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment, Noncurrent		19,661
Accumulated depreciation and amortization		15,888
Decommissioning Fund Investments		15,938
Investments		193
Mark-to-market derivative assets, noncurrent		949
Other		1,768
Property, plant, and equipment, deferred debits, and other assets of discontinued operations		38,509
Total assets		46,344
Short-term Debt		2,082
Long-term Debt and Lease Obligation, Current		1,220
Disposal Group, Including Discontinued Operation, Accounts Payable, Current		1,757
Disposal Group, Including Discontinued Operation, Accrued Liabilities, Current		818
Mark-to-market derivative liabilities, current		981
Renewable energy credit obligation		779
Disposal Group, Including Discontinued Operations, Assets, Current - Liabilities held for sale		3
Disposal Group, Including Discontinued Operation, Other Liabilities, Current		300
Current liabilities of discontinued operations		7,940
Long-term Debt, Excluding Current Maturities		4,575
Deferred income taxes and unamortized investment tax credits		3,583
Asset retirement obligations, noncurrent		12,819
Disposal Group, Including Discontinued Operation, Pension Plan Benefit Obligation, Noncurrent		939
Disposal Group, Including Discontinued Operation, Postretirement Plan Benefit Obligation, Noncurrent		876
Spent Nuclear Fuel Obligation, Noncurrent		1,210
Derivative Liability, Noncurrent		513
Other deferred credits and other liabilities		1,161
Long-term debt, deferred credits, and other liabilities of discontinued operations		25,676
Total liabilities		$ 33,616

Discontinued Operations (Deta_3

Discontinued Operations (Details) - Cash Flow - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Business Dispositions [Line Items]
Depreciation, Amortization and Accretion, Net	$ 3,533	$ 7,573	$ 6,527
Asset Impairment Charges	48
Gain (Loss) on Sale of Assets and Asset Impairment Charges	8	201	24
Deferred Income Taxes and Tax Credits	255	18	309
Unrealized Gain (Loss) on Derivatives	53	568	268
Gain (Loss) on Investments	(205)	586	461
Other non-cash operating activities	(370)	200	(592)
Payments to Acquire Property, Plant, and Equipment	7,147	7,981	8,048
Collection of deferred purchase price	169	3,902	3,771
Increase (decrease) in capital expenditures not paid	36	16	194
Increase in Deferred Purchase Price	348	3,652	4,441
Increase (decrease) in PPE related to ARO update	332	642	850
Exelon Generation Co L L C [Member]
Business Dispositions [Line Items]
Depreciation, Amortization and Accretion, Net	207	4,540	3,636
Asset Impairment Charges	0	545	563
Gain (Loss) on Sale of Assets and Asset Impairment Charges	9	(201)	(11)
Deferred Income Taxes and Tax Credits	(143)	(224)	94
Unrealized Gain (Loss) on Derivatives	(59)	(568)	(270)
Gain (Loss) on Investments	205	(586)	(461)
Net unrealized losses (gains) on equity investments	16	160	(186)
Other non-cash operating activities	36	(946)	(659)
Payments to Acquire Property, Plant, and Equipment	(227)	(1,341)	(1,759)
Collection of deferred purchase price	169	3,902	3,771
Increase (decrease) in capital expenditures not paid	(128)	96	(88)
Increase in Deferred Purchase Price	348	3,652	4,441
Increase (decrease) in PPE related to ARO update	$ 335	$ 618	$ 850

Regulatory Matters- Narrative (

Regulatory Matters- Narrative (Details) $ in Millions

12 Months Ended

36 Months Ended

48 Months Ended

72 Months Ended

Sep. 27, 2022

Feb. 03, 2022

Dec. 31, 2022 USD ($)

Dec. 31, 2025 USD ($)

Jun. 30, 2027 USD ($)

Dec. 31, 2024 USD ($)

Jun. 30, 2023 USD ($)

Dec. 31, 2022 USD ($)

Jul. 10, 2023 USD ($)

Mar. 31, 2022 USD ($)

Jul. 09, 2021 USD ($)

Jul. 02, 2021 USD ($)

Commonwealth Edison Co [Member]

Regulatory Matters Additional Narrative Information [Line Items]

Maximum increase of revenue requirement

105%

Beneficial electrification planned expenditure

$ 300

Basis points for ComEd's Electric Distribution rates

580

Basis Points - ComEd Symmetrical Performance Adjustments

Commonwealth Edison Co [Member] | Carbon Mitigation Credit Rider

Regulatory Matters Additional Narrative Information [Line Items]

Increase (Decrease) in Regulatory Assets

$ 117

Baltimore Gas and Electric Company [Member]

Regulatory Matters Additional Narrative Information [Line Items]

Maryland Relief Act Funds

$ 50

Potomac Electric Power Company [Member]

Regulatory Matters Additional Narrative Information [Line Items]

Maryland Relief Act Funds

$ 12

Potomac Electric Power Company [Member] | Forecast [Member]

Regulatory Matters Additional Narrative Information [Line Items]

Proposed Capital Expenditure

$ 500

Delmarva Power & Light Company [Member]

Regulatory Matters Additional Narrative Information [Line Items]

Maryland Relief Act Funds

$ 8

Atlantic City Electric Company [Member]

Regulatory Matters Additional Narrative Information [Line Items]

Proposed Capital Expenditure

$ 220

Contract Termination Liability

137

$ 137

$ 203

Gain (Loss) on Contract Termination

Atlantic City Electric Company [Member] | Forecast [Member]

Regulatory Matters Additional Narrative Information [Line Items]

Proposed Capital Expenditure

338

Public Utilities, Approved Rate Increase (Decrease), Amount

$ 96

Approved Capital Expenditure IIP 2.0

$ 379

Other Current Liabilities [Member] | Atlantic City Electric Company [Member]

Regulatory Matters Additional Narrative Information [Line Items]

Contract Termination Liability

Other Noncurrent Liabilities [Member] | Atlantic City Electric Company [Member]

Regulatory Matters Additional Narrative Information [Line Items]

Contract Termination Liability

$ 50

Regulatory Matters - Schedule o

Regulatory Matters - Schedule of Completed Rate Cases (Details) - USD ($) $ in Millions

Dec. 14, 2022

Nov. 17, 2022

Oct. 27, 2022

Oct. 12, 2022

Aug. 15, 2022

May 19, 2022

Apr. 15, 2022

Mar. 31, 2022

Mar. 02, 2022

Feb. 23, 2022

Dec. 23, 2021

Dec. 22, 2021

Dec. 01, 2021

Nov. 18, 2021

Jul. 14, 2021

Jun. 28, 2021

Jun. 08, 2021

Apr. 16, 2021

Mar. 31, 2021

Mar. 30, 2021

Feb. 26, 2021

Dec. 16, 2020

Sep. 11, 2020

Jun. 01, 2020

Commonwealth Edison Co [Member] | Illinois 2021 Electric Distribution Base Rate Case

Regulatory Matters Completed Rate Cases [Line Items]

Public Utilities, Requested Rate Increase (Decrease), Amount

$ 51

Public Utilities, Approved Rate Increase (Decrease), Amount

$ 46

Public Utilities, Approved Return on Equity, Percentage

7.36%

Commonwealth Edison Co [Member] | Illinois 2021 Electric Distribution Base Rate Case | 2020

Regulatory Matters Completed Rate Cases [Line Items]

Public Utilities, Approved Rate Increase (Decrease), Amount

$ 9

Public Utilities, Approved Return on Equity, Percentage

7.29%

Basis points for ComEd's Revenue Requirement

580

Public Utilities, Approved Equity Capital Structure, Percentage

5.69%

Commonwealth Edison Co [Member] | Illinois 2021 Electric Distribution Base Rate Case | 2020 | Performance Metrics Penalty

Regulatory Matters Completed Rate Cases [Line Items]

Basis points for ComEd's Revenue Requirement

Commonwealth Edison Co [Member] | Illinois 2021 Electric Distribution Base Rate Case | 2022

Regulatory Matters Completed Rate Cases [Line Items]

Public Utilities, Approved Rate Increase (Decrease), Amount

$ 37

Public Utilities, Approved Return on Equity, Percentage

7.36%

Basis points for ComEd's Revenue Requirement

580

Public Utilities, Approved Equity Capital Structure, Percentage

5.72%

Commonwealth Edison Co [Member] | Illinois 2022 Electric Distribution Base Rate Case

Regulatory Matters Completed Rate Cases [Line Items]

Public Utilities, Requested Rate Increase (Decrease), Amount

$ 199

Public Utilities, Approved Rate Increase (Decrease), Amount

$ 199

Public Utilities, Approved Return on Equity, Percentage

7.85%

Commonwealth Edison Co [Member] | Illinois 2022 Electric Distribution Base Rate Case | 2021

Regulatory Matters Completed Rate Cases [Line Items]

Public Utilities, Approved Return on Equity, Percentage

7.78%

Basis points for ComEd's Revenue Requirement

580

Public Utilities Approved Rate Increase (Decrease), Prior Year Annual Reconciliation

$ 55

Public Utilities, Approved Equity Capital Structure, Percentage

5.91%

Commonwealth Edison Co [Member] | Illinois 2022 Electric Distribution Base Rate Case | 2021 | Performance Metrics Penalty

Regulatory Matters Completed Rate Cases [Line Items]

Basis points for ComEd's Revenue Requirement

Commonwealth Edison Co [Member] | Illinois 2022 Electric Distribution Base Rate Case | 2023

Regulatory Matters Completed Rate Cases [Line Items]

Public Utilities, Approved Rate Increase (Decrease), Amount

$ 144

Public Utilities, Approved Return on Equity, Percentage

7.85%

Basis points for ComEd's Revenue Requirement

580

Public Utilities, Approved Equity Capital Structure, Percentage

5.94%

PECO Energy Co [Member] | Pennsylvania 2021 Electric Distribution Base Rate Case [Member]

Regulatory Matters Completed Rate Cases [Line Items]

Public Utilities, Requested Rate Increase (Decrease), Amount

$ 246

Public Utilities, Approved Rate Increase (Decrease), Amount

$ 132

PECO Energy Co [Member] | Pennsylvania 2022 Natural Gas Distribution Base Rate Case

Regulatory Matters Completed Rate Cases [Line Items]

Public Utilities, Requested Rate Increase (Decrease), Amount

$ 82

Public Utilities, Approved Rate Increase (Decrease), Amount

$ 55

Baltimore Gas and Electric Company [Member] | Maryland 2020 Electric Distribution Base Rate Case [Member]

Regulatory Matters Completed Rate Cases [Line Items]

Public Utilities, Requested Rate Increase (Decrease), Amended, Amount

$ 203

Public Utilities, Approved Rate Increase (Decrease), Amount

$ 140

Public Utilities, Approved Return on Equity, Percentage

9.50%

Baltimore Gas and Electric Company [Member] | Maryland 2020 Electric Distribution Base Rate Case [Member] | 2021

Regulatory Matters Completed Rate Cases [Line Items]

Public Utilities, Approved Rate Increase (Decrease), Amount

$ 59

Baltimore Gas and Electric Company [Member] | Maryland 2020 Electric Distribution Base Rate Case [Member] | 2022

Regulatory Matters Completed Rate Cases [Line Items]

Public Utilities, Approved Rate Increase (Decrease), Amount

Baltimore Gas and Electric Company [Member] | Maryland 2020 Electric Distribution Base Rate Case [Member] | 2022 | Offsets

Regulatory Matters Completed Rate Cases [Line Items]

Public Utilities, Approved Rate Increase (Decrease), Percentage

25%

Baltimore Gas and Electric Company [Member] | Maryland 2020 Electric Distribution Base Rate Case [Member] | 2023

Regulatory Matters Completed Rate Cases [Line Items]

Public Utilities, Approved Rate Increase (Decrease), Amount

Baltimore Gas and Electric Company [Member] | Maryland 2020 Gas Distribution Base Rate Case [Member]

Regulatory Matters Completed Rate Cases [Line Items]

Public Utilities, Requested Rate Increase (Decrease), Amended, Amount

$ 108

Public Utilities, Approved Rate Increase (Decrease), Amount

$ 74

Public Utilities, Approved Return on Equity, Percentage

9.65%

Baltimore Gas and Electric Company [Member] | Maryland 2020 Gas Distribution Base Rate Case [Member] | 2021

Regulatory Matters Completed Rate Cases [Line Items]

Public Utilities, Approved Rate Increase (Decrease), Amount

$ 53

Baltimore Gas and Electric Company [Member] | Maryland 2020 Gas Distribution Base Rate Case [Member] | 2022

Regulatory Matters Completed Rate Cases [Line Items]

Public Utilities, Approved Rate Increase (Decrease), Amount

Baltimore Gas and Electric Company [Member] | Maryland 2020 Gas Distribution Base Rate Case [Member] | 2022 | Offsets

Regulatory Matters Completed Rate Cases [Line Items]

Public Utilities, Approved Rate Increase (Decrease), Percentage

50%

Baltimore Gas and Electric Company [Member] | Maryland 2020 Gas Distribution Base Rate Case [Member] | 2023

Regulatory Matters Completed Rate Cases [Line Items]

Public Utilities, Approved Rate Increase (Decrease), Amount

$ 10

Potomac Electric Power Company [Member] | Maryland 2020 Electric Distribution Base Rate Case [Member]

Regulatory Matters Completed Rate Cases [Line Items]

Public Utilities, Requested Rate Increase (Decrease), Amended, Amount

$ 104

Public Utilities, Approved Rate Increase (Decrease), Amount

$ 52

Public Utilities, Approved Return on Equity, Percentage

9.55%

Potomac Electric Power Company [Member] | Maryland 2020 Electric Distribution Base Rate Case [Member] | 2022

Regulatory Matters Completed Rate Cases [Line Items]

Public Utilities, Approved Rate Increase (Decrease), Amount

$ 21

Potomac Electric Power Company [Member] | Maryland 2020 Electric Distribution Base Rate Case [Member] | 2023

Regulatory Matters Completed Rate Cases [Line Items]

Public Utilities, Approved Rate Increase (Decrease), Amount

Potomac Electric Power Company [Member] | Maryland 2020 Electric Distribution Base Rate Case [Member] | 2023 | Offsets

Regulatory Matters Completed Rate Cases [Line Items]

Public Utilities, Approved Rate Increase (Decrease), Percentage

25%

Potomac Electric Power Company [Member] | Maryland 2020 Electric Distribution Base Rate Case [Member] | 2024

Regulatory Matters Completed Rate Cases [Line Items]

Public Utilities, Approved Rate Increase (Decrease), Amount

$ 15

Potomac Electric Power Company [Member] | District of Columbia 2019 Electric Distribution Base Rate Case

Regulatory Matters Completed Rate Cases [Line Items]

Public Utilities, Requested Rate Increase (Decrease), Amended, Amount

$ 136

Public Utilities, Approved Rate Increase (Decrease), Amount

$ 109

Public Utilities, Approved Return on Equity, Percentage

9.275%

Potomac Electric Power Company [Member] | District of Columbia 2019 Electric Distribution Base Rate Case | 2021

Regulatory Matters Completed Rate Cases [Line Items]

Public Utilities, Approved Rate Increase (Decrease), Amount

$ 42

Potomac Electric Power Company [Member] | District of Columbia 2019 Electric Distribution Base Rate Case | 2021 | Offsets

Regulatory Matters Completed Rate Cases [Line Items]

Public Utilities, Approved Rate Increase (Decrease), Amount

(22)

Potomac Electric Power Company [Member] | District of Columbia 2019 Electric Distribution Base Rate Case | 2022

Regulatory Matters Completed Rate Cases [Line Items]

Public Utilities, Approved Rate Increase (Decrease), Amount

Potomac Electric Power Company [Member] | District of Columbia 2019 Electric Distribution Base Rate Case | 2022 | Offsets

Regulatory Matters Completed Rate Cases [Line Items]

Public Utilities, Approved Rate Increase (Decrease), Amount

$ (40)

Delmarva Power & Light Company [Member] | Maryland 2021 Electric Distribution Base Rate Case

Regulatory Matters Completed Rate Cases [Line Items]

Public Utilities, Requested Rate Increase (Decrease), Amended, Amount

$ 27

Public Utilities, Approved Rate Increase (Decrease), Amount

$ 13

Public Utilities, Approved Return on Equity, Percentage

9.60%

Delmarva Power & Light Company [Member] | Maryland 2022 Electric Distribution Base Rate Case

Regulatory Matters Completed Rate Cases [Line Items]

Public Utilities, Requested Rate Increase (Decrease), Amended, Amount

$ 38

Public Utilities, Approved Rate Increase (Decrease), Amount

$ 29

Public Utilities, Approved Return on Equity, Percentage

9.60%

Delmarva Power & Light Company [Member] | Maryland 2022 Electric Distribution Base Rate Case | 2023

Regulatory Matters Completed Rate Cases [Line Items]

Public Utilities, Approved Rate Increase (Decrease), Amount

$ 17

Delmarva Power & Light Company [Member] | Maryland 2022 Electric Distribution Base Rate Case | 2024

Regulatory Matters Completed Rate Cases [Line Items]

Public Utilities, Approved Rate Increase (Decrease), Amount

Delmarva Power & Light Company [Member] | Maryland 2022 Electric Distribution Base Rate Case | 2025

Regulatory Matters Completed Rate Cases [Line Items]

Public Utilities, Approved Rate Increase (Decrease), Amount

$ 6

Delmarva Power & Light Company [Member] | Delaware 2022 Natural Gas Distribution Base Rate Case

Regulatory Matters Completed Rate Cases [Line Items]

Public Utilities, Requested Rate Increase (Decrease), Amended, Amount

$ 13

Public Utilities, Approved Rate Increase (Decrease), Amount

$ 8

Public Utilities, Approved Return on Equity, Percentage

9.60%

Atlantic City Electric Company [Member] | New Jersey 2020 Electric Distribution Base Rate Case

Regulatory Matters Completed Rate Cases [Line Items]

Public Utilities, Requested Rate Increase (Decrease), Amended, Amount

$ 67

Public Utilities, Approved Rate Increase (Decrease), Amount

$ 41

Public Utilities, Approved Return on Equity, Percentage

9.60%

Atlantic City Electric Company [Member] | New Jersey 2020 Electric Distribution Base Rate Case | Tax Benefits

Regulatory Matters Completed Rate Cases [Line Items]

Public Utilities, Approved Rate Increase (Decrease), Amount

$ 11

Regulatory Matters - Schedule_2

Regulatory Matters - Schedule of Pending Rate Cases (Details) - USD ($) $ in Millions	Jan. 17, 2023	Dec. 15, 2022
Commonwealth Edison Co [Member] \| Illinois 2023 Electric Distribution Base Rate Case
Regulatory Matters Pending Rate Cases [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount	$ 1,472
Commonwealth Edison Co [Member] \| Illinois 2023 Electric Distribution Base Rate Case \| Minimum [Member]
Regulatory Matters Pending Rate Cases [Line Items]
Public Utilities, Requested Return on Equity, Percentage	10.50%
Public Utilities, Requested Equity Capital Structure, Percentage	50.58%
Commonwealth Edison Co [Member] \| Illinois 2023 Electric Distribution Base Rate Case \| Maximum [Member]
Regulatory Matters Pending Rate Cases [Line Items]
Public Utilities, Requested Return on Equity, Percentage	10.65%
Public Utilities, Requested Equity Capital Structure, Percentage	51.19%
Commonwealth Edison Co [Member] \| Illinois 2023 Electric Distribution Base Rate Case \| 2024
Regulatory Matters Pending Rate Cases [Line Items]
Public Utilities, Requested Return on Equity, Percentage	10.50%
Public Utilities, Requested Rate Increase (Decrease), Initial Revenue Requirement, Amount	$ 877
Public Utilities, Requested Equity Capital Structure, Percentage	7.43%
Commonwealth Edison Co [Member] \| Illinois 2023 Electric Distribution Base Rate Case \| 2025
Regulatory Matters Pending Rate Cases [Line Items]
Public Utilities, Requested Return on Equity, Percentage	10.55%
Public Utilities, Requested Rate Increase (Decrease), Initial Revenue Requirement, Amount	$ 175
Public Utilities, Requested Equity Capital Structure, Percentage	7.50%
Commonwealth Edison Co [Member] \| Illinois 2023 Electric Distribution Base Rate Case \| 2026
Regulatory Matters Pending Rate Cases [Line Items]
Public Utilities, Requested Return on Equity, Percentage	10.60%
Public Utilities, Requested Rate Increase (Decrease), Initial Revenue Requirement, Amount	$ 217
Public Utilities, Requested Equity Capital Structure, Percentage	7.62%
Public Utilities, Requested Rate Increase (Decrease), Proposed Revenue Requirement Phase-In	$ 307
Commonwealth Edison Co [Member] \| Illinois 2023 Electric Distribution Base Rate Case \| 2027
Regulatory Matters Pending Rate Cases [Line Items]
Public Utilities, Requested Return on Equity, Percentage	10.65%
Public Utilities, Requested Rate Increase (Decrease), Initial Revenue Requirement, Amount	$ 203
Public Utilities, Requested Equity Capital Structure, Percentage	7.70%
Delmarva Power & Light Company [Member] \| Delaware 2022 Electric Distribution Base Rate Case
Regulatory Matters Pending Rate Cases [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount		$ 60
Public Utilities, Requested Return on Equity, Percentage		10.50%

Regulatory Matters - Annual Ele

Regulatory Matters - Annual Electric Transmission Filings (Details) - USD ($) $ in Millions	May 27, 2022	May 13, 2022	Apr. 29, 2022	Apr. 27, 2022
Commonwealth Edison Co [Member] \| 2022 Transmission Formula Rate Annual Update [Domain]
Public Utilities, General Disclosures [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount			$ 24
Annual Reconciliation Increase (Decrease)			(24)
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount			$ 0
Public Utilities, Approved Equity Capital Structure, Percentage			8.11%
Public Utilities, Approved Return on Equity, Percentage			11.50%
Cap on Equity Component of Rate of Return on Common Equity in Federal Energy Regulatory Committee Complaint			55%
Basis points for Transmission Formula Rate			50
PECO Energy Co [Member] \| 2022 Transmission Formula Rate Annual Update [Domain]
Public Utilities, General Disclosures [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount	$ 23
Annual Reconciliation Increase (Decrease)	16
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount	$ 39
Public Utilities, Approved Equity Capital Structure, Percentage	7.30%
Public Utilities, Approved Return on Equity, Percentage	10.35%
Cap on Equity Component of Rate of Return on Common Equity in Federal Energy Regulatory Committee Complaint	55.75%
Basis points for Transmission Formula Rate	50
Baltimore Gas and Electric Company [Member] \| 2022 Transmission Formula Rate Annual Update [Domain]
Public Utilities, General Disclosures [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount				$ 25
Annual Reconciliation Increase (Decrease)				(4)
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount				$ 16
Public Utilities, Approved Equity Capital Structure, Percentage				7.30%
Public Utilities, Approved Return on Equity, Percentage				10.50%
Basis points for Transmission Formula Rate				50
Baltimore Gas and Electric Company [Member] \| 2022 Transmission Formula Rate Revenue Reduction
Public Utilities, General Disclosures [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount				$ 5
Potomac Electric Power Company [Member] \| 2022 Transmission Formula Rate Annual Update [Domain]
Public Utilities, General Disclosures [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount		$ 16
Annual Reconciliation Increase (Decrease)		15
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount		$ 31
Public Utilities, Approved Equity Capital Structure, Percentage		7.60%
Public Utilities, Approved Return on Equity, Percentage		10.50%
Basis points for Transmission Formula Rate		50
Delmarva Power & Light Company [Member] \| 2022 Transmission Formula Rate Annual Update [Domain]
Public Utilities, General Disclosures [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount		$ 9
Annual Reconciliation Increase (Decrease)		2
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount		$ 11
Public Utilities, Approved Equity Capital Structure, Percentage		7.09%
Public Utilities, Approved Return on Equity, Percentage		10.50%
Basis points for Transmission Formula Rate		50
Atlantic City Electric Company [Member] \| 2022 Transmission Formula Rate Annual Update [Domain]
Public Utilities, General Disclosures [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount		$ 21
Annual Reconciliation Increase (Decrease)		13
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount		$ 34
Public Utilities, Approved Equity Capital Structure, Percentage		7.18%
Public Utilities, Approved Return on Equity, Percentage		10.50%
Basis points for Transmission Formula Rate		50

Regulatory Matters - Energy Eff

Regulatory Matters - Energy Efficiency Formula Rate (Details) - Commonwealth Edison Co [Member] - ComEd 2022 Energy Efficiency Formula Rate [Domain] - USD ($) $ in Millions	Oct. 27, 2022	May 25, 2022
Schedule of Energy Efficiency Formula Rate Updates [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount		$ 50
Public Utilities, Approved Rate Increase (Decrease), Amount	$ 50
Public Utilities, Approved Return on Equity, Percentage	7.85%
Public Utilities, Requested Equity Capital Structure, Percentage	5.94%
Basis points for ComEd's Revenue Requirement	580
2021
Schedule of Energy Efficiency Formula Rate Updates [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount	$ (16)
Public Utilities, Approved Return on Equity, Percentage	6.99%
Public Utilities, Approved Equity Capital Structure, Percentage	5.52%
2023
Schedule of Energy Efficiency Formula Rate Updates [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount	$ 66

Regulatory Matters - Schedule_3

Regulatory Matters - Schedule of Regulatory Assets (Details) - USD ($) $ in Millions	48 Months Ended		72 Months Ended
	Dec. 31, 2024	Dec. 31, 2022	Jul. 10, 2023	Dec. 31, 2021
Regulatory Assets [Line Items]
Regulatory Assets		$ 9,678		$ 9,520
Current regulatory assets		1,641		1,296
Noncurrent regulatory assets		8,037		8,224
Pension and Other Postretirement Plans Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets		1,867		2,409
Pension and Post Retirement Plan Merger Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets		769		893
Deferred income taxes
Regulatory Assets [Line Items]
Regulatory Assets		606		883
Advanced Metering Infrastructure Deployment Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets		122		145
Advanced Metering Infrastructure Legacy Meter Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets		160		186
Electric Distribution Formula Rate Annual Reconciliations [Member]
Regulatory Assets [Line Items]
Regulatory Assets		271		44
Electric Distribution Formula Rate One-time Events [Member]
Regulatory Assets [Line Items]
Regulatory Assets		115		104
Energy Efficiency Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets		1,434		1,181
Fair value of long-term debt
Regulatory Assets [Line Items]
Regulatory Assets		521		557
Fair value of PHI's unamortized energy contracts
Regulatory Assets [Line Items]
Regulatory Assets		44		236
Carbon Mitigation Credit Rider
Regulatory Assets [Line Items]
Regulatory Assets		843
Asset retirement obligations
Regulatory Assets [Line Items]
Regulatory Assets		151		145
MGP remediation costs
Regulatory Assets [Line Items]
Regulatory Assets		318		283
Renewable Energy Program [Member]
Regulatory Assets [Line Items]
Regulatory Assets		85		219
Electric energy and natural gas costs
Regulatory Assets [Line Items]
Regulatory Assets		241		96
Transmission formula rate annual reconciliations [Member]
Regulatory Assets [Line Items]
Regulatory Assets		37		43
Energy efficiency and demand response programs
Regulatory Assets [Line Items]
Regulatory Assets		560		564
Under-recovered revenue decoupling
Regulatory Assets [Line Items]
Regulatory Assets		106		157
Removal costs
Regulatory Assets [Line Items]
Regulatory Assets		782		758
DC PLUG charge
Regulatory Assets [Line Items]
Regulatory Assets		37		70
Deferred storm costs
Regulatory Assets [Line Items]
Regulatory Assets		90		49
COVID-19 Regulatory Asset
Regulatory Assets [Line Items]
Regulatory Assets		58		82
Under-Recovered Credit Loss Expense
Regulatory Assets [Line Items]
Regulatory Assets		71		89
Other
Regulatory Assets [Line Items]
Regulatory Assets		390		327
Commonwealth Edison Co [Member]
Regulatory Assets [Line Items]
Regulatory Assets		3,442		2,205
Current regulatory assets		775		335
Noncurrent regulatory assets		2,667		1,870
Commonwealth Edison Co [Member] \| Pension and Other Postretirement Plans Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets		0		0
Commonwealth Edison Co [Member] \| Pension and Post Retirement Plan Merger Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets		0		0
Commonwealth Edison Co [Member] \| Deferred income taxes
Regulatory Assets [Line Items]
Regulatory Assets		0		0
Commonwealth Edison Co [Member] \| Advanced Metering Infrastructure Deployment Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets		0		0
Commonwealth Edison Co [Member] \| Advanced Metering Infrastructure Legacy Meter Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets		48		69
Commonwealth Edison Co [Member] \| Electric Distribution Formula Rate Annual Reconciliations [Member]
Regulatory Assets [Line Items]
Regulatory Assets		271		44
Commonwealth Edison Co [Member] \| Electric Distribution Formula Rate One-time Events [Member]
Regulatory Assets [Line Items]
Regulatory Assets		115		104
Commonwealth Edison Co [Member] \| Energy Efficiency Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets		1,434		1,181
Commonwealth Edison Co [Member] \| Fair value of long-term debt
Regulatory Assets [Line Items]
Regulatory Assets		0		0
Commonwealth Edison Co [Member] \| Fair value of PHI's unamortized energy contracts
Regulatory Assets [Line Items]
Regulatory Assets		0		0
Commonwealth Edison Co [Member] \| Carbon Mitigation Credit Rider
Regulatory Assets [Line Items]
Regulatory Assets		843
Commonwealth Edison Co [Member] \| Asset retirement obligations
Regulatory Assets [Line Items]
Regulatory Assets		99		99
Commonwealth Edison Co [Member] \| MGP remediation costs
Regulatory Assets [Line Items]
Regulatory Assets		293		266
Commonwealth Edison Co [Member] \| Renewable Energy Program [Member]
Regulatory Assets [Line Items]
Regulatory Assets		85		219
Commonwealth Edison Co [Member] \| Electric energy and natural gas costs
Regulatory Assets [Line Items]
Regulatory Assets		0		0
Commonwealth Edison Co [Member] \| Transmission formula rate annual reconciliations [Member]
Regulatory Assets [Line Items]
Regulatory Assets		0		0
Commonwealth Edison Co [Member] \| Energy efficiency and demand response programs
Regulatory Assets [Line Items]
Regulatory Assets		0		0
Commonwealth Edison Co [Member] \| Under-recovered revenue decoupling
Regulatory Assets [Line Items]
Regulatory Assets		0		0
Commonwealth Edison Co [Member] \| Removal costs
Regulatory Assets [Line Items]
Regulatory Assets		0		0
Commonwealth Edison Co [Member] \| DC PLUG charge
Regulatory Assets [Line Items]
Regulatory Assets		0		0
Commonwealth Edison Co [Member] \| Deferred storm costs
Regulatory Assets [Line Items]
Regulatory Assets		0		0
Commonwealth Edison Co [Member] \| COVID-19 Regulatory Asset
Regulatory Assets [Line Items]
Regulatory Assets		20		28
Commonwealth Edison Co [Member] \| Under-Recovered Credit Loss Expense
Regulatory Assets [Line Items]
Regulatory Assets		38		60
Commonwealth Edison Co [Member] \| Other
Regulatory Assets [Line Items]
Regulatory Assets		196		135
PECO Energy Co [Member]
Regulatory Assets [Line Items]
Regulatory Assets		732		991
Current regulatory assets		80		48
Noncurrent regulatory assets		652		943
PECO Energy Co [Member] \| Pension and Other Postretirement Plans Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets		0		0
PECO Energy Co [Member] \| Pension and Post Retirement Plan Merger Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets		0		0
PECO Energy Co [Member] \| Deferred income taxes
Regulatory Assets [Line Items]
Regulatory Assets		595		873
PECO Energy Co [Member] \| Advanced Metering Infrastructure Deployment Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets		0		0
PECO Energy Co [Member] \| Advanced Metering Infrastructure Legacy Meter Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets		0		0
PECO Energy Co [Member] \| Electric Distribution Formula Rate Annual Reconciliations [Member]
Regulatory Assets [Line Items]
Regulatory Assets		0		0
PECO Energy Co [Member] \| Electric Distribution Formula Rate One-time Events [Member]
Regulatory Assets [Line Items]
Regulatory Assets		0		0
PECO Energy Co [Member] \| Energy Efficiency Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets		0		0
PECO Energy Co [Member] \| Fair value of long-term debt
Regulatory Assets [Line Items]
Regulatory Assets		0		0
PECO Energy Co [Member] \| Fair value of PHI's unamortized energy contracts
Regulatory Assets [Line Items]
Regulatory Assets		0		0
PECO Energy Co [Member] \| Carbon Mitigation Credit Rider
Regulatory Assets [Line Items]
Regulatory Assets		0
PECO Energy Co [Member] \| Asset retirement obligations
Regulatory Assets [Line Items]
Regulatory Assets		22		21
PECO Energy Co [Member] \| MGP remediation costs
Regulatory Assets [Line Items]
Regulatory Assets		13		8
PECO Energy Co [Member] \| Renewable Energy Program [Member]
Regulatory Assets [Line Items]
Regulatory Assets		0		0
PECO Energy Co [Member] \| Electric energy and natural gas costs
Regulatory Assets [Line Items]
Regulatory Assets		15		0
PECO Energy Co [Member] \| Transmission formula rate annual reconciliations [Member]
Regulatory Assets [Line Items]
Regulatory Assets		16		14
PECO Energy Co [Member] \| Energy efficiency and demand response programs
Regulatory Assets [Line Items]
Regulatory Assets		0		0
PECO Energy Co [Member] \| Under-recovered revenue decoupling
Regulatory Assets [Line Items]
Regulatory Assets		0		0
PECO Energy Co [Member] \| Removal costs
Regulatory Assets [Line Items]
Regulatory Assets		0		0
PECO Energy Co [Member] \| DC PLUG charge
Regulatory Assets [Line Items]
Regulatory Assets		0		0
PECO Energy Co [Member] \| Deferred storm costs
Regulatory Assets [Line Items]
Regulatory Assets		0		0
PECO Energy Co [Member] \| COVID-19 Regulatory Asset
Regulatory Assets [Line Items]
Regulatory Assets		17		33
PECO Energy Co [Member] \| Under-Recovered Credit Loss Expense
Regulatory Assets [Line Items]
Regulatory Assets		0		0
PECO Energy Co [Member] \| Other
Regulatory Assets [Line Items]
Regulatory Assets		54		42
Baltimore Gas and Electric Company [Member]
Regulatory Assets [Line Items]
Regulatory Assets		704		692
Current regulatory assets		177		215
Noncurrent regulatory assets		527		477
Baltimore Gas and Electric Company [Member] \| Pension and Other Postretirement Plans Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets		0		0
Baltimore Gas and Electric Company [Member] \| Pension and Post Retirement Plan Merger Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets		0		0
Baltimore Gas and Electric Company [Member] \| Deferred income taxes
Regulatory Assets [Line Items]
Regulatory Assets		0		0
Baltimore Gas and Electric Company [Member] \| Advanced Metering Infrastructure Deployment Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets		69		89
Baltimore Gas and Electric Company [Member] \| Advanced Metering Infrastructure Legacy Meter Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets		20		29
Baltimore Gas and Electric Company [Member] \| Electric Distribution Formula Rate Annual Reconciliations [Member]
Regulatory Assets [Line Items]
Regulatory Assets		0		0
Baltimore Gas and Electric Company [Member] \| Electric Distribution Formula Rate One-time Events [Member]
Regulatory Assets [Line Items]
Regulatory Assets		0		0
Baltimore Gas and Electric Company [Member] \| Energy Efficiency Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets		0		0
Baltimore Gas and Electric Company [Member] \| Fair value of long-term debt
Regulatory Assets [Line Items]
Regulatory Assets		0		0
Baltimore Gas and Electric Company [Member] \| Fair value of PHI's unamortized energy contracts
Regulatory Assets [Line Items]
Regulatory Assets		0		0
Baltimore Gas and Electric Company [Member] \| Carbon Mitigation Credit Rider
Regulatory Assets [Line Items]
Regulatory Assets		0
Baltimore Gas and Electric Company [Member] \| Asset retirement obligations
Regulatory Assets [Line Items]
Regulatory Assets		21		19
Baltimore Gas and Electric Company [Member] \| MGP remediation costs
Regulatory Assets [Line Items]
Regulatory Assets		12		9
Baltimore Gas and Electric Company [Member] \| Renewable Energy Program [Member]
Regulatory Assets [Line Items]
Regulatory Assets		0		0
Baltimore Gas and Electric Company [Member] \| Electric energy and natural gas costs
Regulatory Assets [Line Items]
Regulatory Assets		25		49
Baltimore Gas and Electric Company [Member] \| Transmission formula rate annual reconciliations [Member]
Regulatory Assets [Line Items]
Regulatory Assets		0		1
Baltimore Gas and Electric Company [Member] \| Energy efficiency and demand response programs
Regulatory Assets [Line Items]
Regulatory Assets		286		283
Baltimore Gas and Electric Company [Member] \| Under-recovered revenue decoupling
Regulatory Assets [Line Items]
Regulatory Assets		8		32
Baltimore Gas and Electric Company [Member] \| Removal costs
Regulatory Assets [Line Items]
Regulatory Assets		171		143
Baltimore Gas and Electric Company [Member] \| DC PLUG charge
Regulatory Assets [Line Items]
Regulatory Assets		0		0
Baltimore Gas and Electric Company [Member] \| Deferred storm costs
Regulatory Assets [Line Items]
Regulatory Assets		55		0
Baltimore Gas and Electric Company [Member] \| Deferred storm costs \| MARYLAND
Regulatory Assets [Line Items]
Regulatory Assets		55
Baltimore Gas and Electric Company [Member] \| COVID-19 Regulatory Asset
Regulatory Assets [Line Items]
Regulatory Assets		8		8
Baltimore Gas and Electric Company [Member] \| COVID-19 Regulatory Asset \| MARYLAND
Regulatory Assets [Line Items]
Regulatory Assets		4
Baltimore Gas and Electric Company [Member] \| COVID-19 Regulatory Asset \| MARYLAND \| 2025
Regulatory Assets [Line Items]
Regulatory Assets		4
Baltimore Gas and Electric Company [Member] \| Under-Recovered Credit Loss Expense
Regulatory Assets [Line Items]
Regulatory Assets		0		0
Baltimore Gas and Electric Company [Member] \| Other
Regulatory Assets [Line Items]
Regulatory Assets		29		30
Baltimore Gas and Electric Company [Member] \| Difference between Carrying Value and Fair Value [Member]
Regulatory Assets [Line Items]
Regulatory Assets		107		114
Pepco Holdings LLC [Member]
Regulatory Assets [Line Items]
Regulatory Assets		2,065		2,226
Current regulatory assets		455		432
Noncurrent regulatory assets		1,610		1,794
Pepco Holdings LLC [Member] \| Pension and Other Postretirement Plans Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets		0		0
Pepco Holdings LLC [Member] \| Pension and Post Retirement Plan Merger Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets		0		0
Pepco Holdings LLC [Member] \| Deferred income taxes
Regulatory Assets [Line Items]
Regulatory Assets		11		10
Pepco Holdings LLC [Member] \| Advanced Metering Infrastructure Deployment Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets		53		56
Pepco Holdings LLC [Member] \| Advanced Metering Infrastructure Legacy Meter Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets		92		88
Pepco Holdings LLC [Member] \| Electric Distribution Formula Rate Annual Reconciliations [Member]
Regulatory Assets [Line Items]
Regulatory Assets		0		0
Pepco Holdings LLC [Member] \| Electric Distribution Formula Rate One-time Events [Member]
Regulatory Assets [Line Items]
Regulatory Assets		0		0
Pepco Holdings LLC [Member] \| Energy Efficiency Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets		0		0
Pepco Holdings LLC [Member] \| Fair value of long-term debt
Regulatory Assets [Line Items]
Regulatory Assets		414		443
Pepco Holdings LLC [Member] \| Fair value of PHI's unamortized energy contracts
Regulatory Assets [Line Items]
Regulatory Assets		44		236
Pepco Holdings LLC [Member] \| Carbon Mitigation Credit Rider
Regulatory Assets [Line Items]
Regulatory Assets		0
Pepco Holdings LLC [Member] \| Asset retirement obligations
Regulatory Assets [Line Items]
Regulatory Assets		9		6
Pepco Holdings LLC [Member] \| MGP remediation costs
Regulatory Assets [Line Items]
Regulatory Assets		0		0
Pepco Holdings LLC [Member] \| Renewable Energy Program [Member]
Regulatory Assets [Line Items]
Regulatory Assets		0		0
Pepco Holdings LLC [Member] \| Electric energy and natural gas costs
Regulatory Assets [Line Items]
Regulatory Assets		201		47
Pepco Holdings LLC [Member] \| Transmission formula rate annual reconciliations [Member]
Regulatory Assets [Line Items]
Regulatory Assets		21		28
Pepco Holdings LLC [Member] \| Energy efficiency and demand response programs
Regulatory Assets [Line Items]
Regulatory Assets		274		281
Pepco Holdings LLC [Member] \| Under-recovered revenue decoupling
Regulatory Assets [Line Items]
Regulatory Assets		98		125
Pepco Holdings LLC [Member] \| Removal costs
Regulatory Assets [Line Items]
Regulatory Assets		611		615
Pepco Holdings LLC [Member] \| DC PLUG charge
Regulatory Assets [Line Items]
Regulatory Assets		37		70
Pepco Holdings LLC [Member] \| Deferred storm costs
Regulatory Assets [Line Items]
Regulatory Assets		35		49
Pepco Holdings LLC [Member] \| COVID-19 Regulatory Asset
Regulatory Assets [Line Items]
Regulatory Assets		13		13
Pepco Holdings LLC [Member] \| Under-Recovered Credit Loss Expense
Regulatory Assets [Line Items]
Regulatory Assets		33		29
Pepco Holdings LLC [Member] \| Other
Regulatory Assets [Line Items]
Regulatory Assets		119		130
Pepco Holdings LLC [Member] \| Difference between Carrying Value and Fair Value [Member]
Regulatory Assets [Line Items]
Regulatory Assets		414		443
Potomac Electric Power Company [Member]
Regulatory Assets [Line Items]
Regulatory Assets		672		745
Current regulatory assets		235		213
Noncurrent regulatory assets		437		532
Potomac Electric Power Company [Member] \| Forecast [Member]
Regulatory Assets [Line Items]
Proposed Capital Expenditure			$ 500
Potomac Electric Power Company [Member] \| Pension and Other Postretirement Plans Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets		0		0
Potomac Electric Power Company [Member] \| Pension and Post Retirement Plan Merger Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets		0		0
Potomac Electric Power Company [Member] \| Deferred income taxes
Regulatory Assets [Line Items]
Regulatory Assets		11		10
Potomac Electric Power Company [Member] \| Advanced Metering Infrastructure Deployment Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets		25		30
Potomac Electric Power Company [Member] \| Advanced Metering Infrastructure Legacy Meter Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets		53		60
Potomac Electric Power Company [Member] \| Electric Distribution Formula Rate Annual Reconciliations [Member]
Regulatory Assets [Line Items]
Regulatory Assets		0		0
Potomac Electric Power Company [Member] \| Electric Distribution Formula Rate One-time Events [Member]
Regulatory Assets [Line Items]
Regulatory Assets		0		0
Potomac Electric Power Company [Member] \| Energy Efficiency Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets		0		0
Potomac Electric Power Company [Member] \| Fair value of long-term debt
Regulatory Assets [Line Items]
Regulatory Assets		0		0
Potomac Electric Power Company [Member] \| Fair value of PHI's unamortized energy contracts
Regulatory Assets [Line Items]
Regulatory Assets		0		0
Potomac Electric Power Company [Member] \| Carbon Mitigation Credit Rider
Regulatory Assets [Line Items]
Regulatory Assets		0
Potomac Electric Power Company [Member] \| Asset retirement obligations
Regulatory Assets [Line Items]
Regulatory Assets		6		5
Potomac Electric Power Company [Member] \| MGP remediation costs
Regulatory Assets [Line Items]
Regulatory Assets		0		0
Potomac Electric Power Company [Member] \| Renewable Energy Program [Member]
Regulatory Assets [Line Items]
Regulatory Assets		0		0
Potomac Electric Power Company [Member] \| Electric energy and natural gas costs
Regulatory Assets [Line Items]
Regulatory Assets		41		29
Potomac Electric Power Company [Member] \| Transmission formula rate annual reconciliations [Member]
Regulatory Assets [Line Items]
Regulatory Assets		3		0
Potomac Electric Power Company [Member] \| Energy efficiency and demand response programs
Regulatory Assets [Line Items]
Regulatory Assets		187		199
Potomac Electric Power Company [Member] \| Under-recovered revenue decoupling
Regulatory Assets [Line Items]
Regulatory Assets		98		125
Potomac Electric Power Company [Member] \| Under-recovered revenue decoupling \| MARYLAND \| 2023
Regulatory Assets [Line Items]
Regulatory Assets		11
Potomac Electric Power Company [Member] \| Under-recovered revenue decoupling \| DISTRICT OF COLUMBIA
Regulatory Assets [Line Items]
Regulatory Assets		38
Potomac Electric Power Company [Member] \| Under-recovered revenue decoupling \| DISTRICT OF COLUMBIA \| 2024
Regulatory Assets [Line Items]
Regulatory Assets		49
Potomac Electric Power Company [Member] \| Removal costs
Regulatory Assets [Line Items]
Regulatory Assets		144		147
Potomac Electric Power Company [Member] \| DC PLUG charge
Regulatory Assets [Line Items]
Regulatory Assets		37		70
Potomac Electric Power Company [Member] \| DC PLUG charge \| Forecast [Member]
Regulatory Assets [Line Items]
Proposed Capital Expenditure			250
Potomac Electric Power Company [Member] \| DC PLUG charge \| Forecast [Member] \| DISTRICT OF COLUMBIA
Regulatory Assets [Line Items]
Proposed Capital Expenditure			$ 250
Potomac Electric Power Company [Member] \| Deferred storm costs
Regulatory Assets [Line Items]
Regulatory Assets		2		3
Potomac Electric Power Company [Member] \| COVID-19 Regulatory Asset
Regulatory Assets [Line Items]
Regulatory Assets		10		10
Potomac Electric Power Company [Member] \| COVID-19 Regulatory Asset \| MARYLAND
Regulatory Assets [Line Items]
Regulatory Assets		1
Potomac Electric Power Company [Member] \| COVID-19 Regulatory Asset \| MARYLAND \| 2026
Regulatory Assets [Line Items]
Regulatory Assets		1
Potomac Electric Power Company [Member] \| COVID-19 Regulatory Asset \| DISTRICT OF COLUMBIA
Regulatory Assets [Line Items]
Regulatory Assets		8
Potomac Electric Power Company [Member] \| Under-Recovered Credit Loss Expense
Regulatory Assets [Line Items]
Regulatory Assets		0		0
Potomac Electric Power Company [Member] \| Other
Regulatory Assets [Line Items]
Regulatory Assets		55		57
Potomac Electric Power Company [Member] \| Under Recovered Decoupling Revenue Total \| DISTRICT OF COLUMBIA
Regulatory Assets [Line Items]
Regulatory Assets		87
Delmarva Power & Light Company [Member]
Regulatory Assets [Line Items]
Regulatory Assets		282		280
Current regulatory assets		80		68
Noncurrent regulatory assets		202		212
Delmarva Power & Light Company [Member] \| Pension and Other Postretirement Plans Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets		0		0
Delmarva Power & Light Company [Member] \| Pension and Post Retirement Plan Merger Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets		0		0
Delmarva Power & Light Company [Member] \| Deferred income taxes
Regulatory Assets [Line Items]
Regulatory Assets		0		0
Delmarva Power & Light Company [Member] \| Advanced Metering Infrastructure Deployment Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets		22		26
Delmarva Power & Light Company [Member] \| Advanced Metering Infrastructure Legacy Meter Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets		17		21
Delmarva Power & Light Company [Member] \| Electric Distribution Formula Rate Annual Reconciliations [Member]
Regulatory Assets [Line Items]
Regulatory Assets		0		0
Delmarva Power & Light Company [Member] \| Electric Distribution Formula Rate One-time Events [Member]
Regulatory Assets [Line Items]
Regulatory Assets		0		0
Delmarva Power & Light Company [Member] \| Energy Efficiency Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets		0		0
Delmarva Power & Light Company [Member] \| Fair value of long-term debt
Regulatory Assets [Line Items]
Regulatory Assets		0		0
Delmarva Power & Light Company [Member] \| Fair value of PHI's unamortized energy contracts
Regulatory Assets [Line Items]
Regulatory Assets		0		0
Delmarva Power & Light Company [Member] \| Carbon Mitigation Credit Rider
Regulatory Assets [Line Items]
Regulatory Assets		0
Delmarva Power & Light Company [Member] \| Asset retirement obligations
Regulatory Assets [Line Items]
Regulatory Assets		2		0
Delmarva Power & Light Company [Member] \| MGP remediation costs
Regulatory Assets [Line Items]
Regulatory Assets		0		0
Delmarva Power & Light Company [Member] \| Renewable Energy Program [Member]
Regulatory Assets [Line Items]
Regulatory Assets		0		0
Delmarva Power & Light Company [Member] \| Electric energy and natural gas costs
Regulatory Assets [Line Items]
Regulatory Assets		26		13
Delmarva Power & Light Company [Member] \| Transmission formula rate annual reconciliations [Member]
Regulatory Assets [Line Items]
Regulatory Assets		5		8
Delmarva Power & Light Company [Member] \| Energy efficiency and demand response programs
Regulatory Assets [Line Items]
Regulatory Assets		74		79
Delmarva Power & Light Company [Member] \| Under-recovered revenue decoupling
Regulatory Assets [Line Items]
Regulatory Assets		0		0
Delmarva Power & Light Company [Member] \| Removal costs
Regulatory Assets [Line Items]
Regulatory Assets		109		109
Delmarva Power & Light Company [Member] \| DC PLUG charge
Regulatory Assets [Line Items]
Regulatory Assets		0		0
Delmarva Power & Light Company [Member] \| Deferred storm costs
Regulatory Assets [Line Items]
Regulatory Assets		2		3
Delmarva Power & Light Company [Member] \| COVID-19 Regulatory Asset
Regulatory Assets [Line Items]
Regulatory Assets		3		3
Delmarva Power & Light Company [Member] \| COVID-19 Regulatory Asset \| MARYLAND
Regulatory Assets [Line Items]
Regulatory Assets		2
Delmarva Power & Light Company [Member] \| COVID-19 Regulatory Asset \| MARYLAND \| 2027
Regulatory Assets [Line Items]
Regulatory Assets		1
Delmarva Power & Light Company [Member] \| Under-Recovered Credit Loss Expense
Regulatory Assets [Line Items]
Regulatory Assets		0		0
Delmarva Power & Light Company [Member] \| Other
Regulatory Assets [Line Items]
Regulatory Assets		22		18
Atlantic City Electric Company [Member]
Regulatory Assets [Line Items]
Regulatory Assets		624		491
Current regulatory assets		130		61
Noncurrent regulatory assets		494		430
Proposed Capital Expenditure	$ 220
Atlantic City Electric Company [Member] \| Forecast [Member]
Regulatory Assets [Line Items]
Proposed Capital Expenditure		338
Atlantic City Electric Company [Member] \| Pension and Other Postretirement Plans Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets		0		0
Atlantic City Electric Company [Member] \| Pension and Post Retirement Plan Merger Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets		0		0
Atlantic City Electric Company [Member] \| Deferred income taxes
Regulatory Assets [Line Items]
Regulatory Assets		0		0
Atlantic City Electric Company [Member] \| Advanced Metering Infrastructure Deployment Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets		6		0
Atlantic City Electric Company [Member] \| Advanced Metering Infrastructure Legacy Meter Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets		22		7
Atlantic City Electric Company [Member] \| Electric Distribution Formula Rate Annual Reconciliations [Member]
Regulatory Assets [Line Items]
Regulatory Assets		0		0
Atlantic City Electric Company [Member] \| Electric Distribution Formula Rate One-time Events [Member]
Regulatory Assets [Line Items]
Regulatory Assets		0		0
Atlantic City Electric Company [Member] \| Energy Efficiency Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets		0		0
Atlantic City Electric Company [Member] \| Fair value of long-term debt
Regulatory Assets [Line Items]
Regulatory Assets		0		0
Atlantic City Electric Company [Member] \| Fair value of PHI's unamortized energy contracts
Regulatory Assets [Line Items]
Regulatory Assets		0		0
Atlantic City Electric Company [Member] \| Carbon Mitigation Credit Rider
Regulatory Assets [Line Items]
Regulatory Assets		0
Atlantic City Electric Company [Member] \| Asset retirement obligations
Regulatory Assets [Line Items]
Regulatory Assets		1		1
Atlantic City Electric Company [Member] \| MGP remediation costs
Regulatory Assets [Line Items]
Regulatory Assets		0		0
Atlantic City Electric Company [Member] \| Renewable Energy Program [Member]
Regulatory Assets [Line Items]
Regulatory Assets		0		0
Atlantic City Electric Company [Member] \| Electric energy and natural gas costs
Regulatory Assets [Line Items]
Regulatory Assets		134		5
Atlantic City Electric Company [Member] \| Transmission formula rate annual reconciliations [Member]
Regulatory Assets [Line Items]
Regulatory Assets		13		20
Atlantic City Electric Company [Member] \| Energy efficiency and demand response programs
Regulatory Assets [Line Items]
Regulatory Assets		13		3
Atlantic City Electric Company [Member] \| Under-recovered revenue decoupling
Regulatory Assets [Line Items]
Regulatory Assets		0		0
Atlantic City Electric Company [Member] \| Removal costs
Regulatory Assets [Line Items]
Regulatory Assets		359		360
Atlantic City Electric Company [Member] \| DC PLUG charge
Regulatory Assets [Line Items]
Regulatory Assets		0		0
Atlantic City Electric Company [Member] \| Deferred storm costs
Regulatory Assets [Line Items]
Regulatory Assets		31		43
Atlantic City Electric Company [Member] \| Deferred storm costs \| NEW JERSEY
Regulatory Assets [Line Items]
Regulatory Assets		7
Atlantic City Electric Company [Member] \| Deferred storm costs \| NEW JERSEY \| 2024
Regulatory Assets [Line Items]
Regulatory Assets		24
Atlantic City Electric Company [Member] \| COVID-19 Regulatory Asset
Regulatory Assets [Line Items]
Regulatory Assets		0		0
Atlantic City Electric Company [Member] \| Under-Recovered Credit Loss Expense
Regulatory Assets [Line Items]
Regulatory Assets		33		29
Atlantic City Electric Company [Member] \| Other
Regulatory Assets [Line Items]
Regulatory Assets		$ 12		$ 23

Regulatory Matters - Schedule_4

Regulatory Matters - Schedule of Regulatory Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Regulatory Liabilities [Line Items]
Regulatory Liabilities	$ 9,549	$ 10,004
Regulatory liabilities, current	437	376
Noncurrent regulatory liabilities	9,112	9,628
Deferred income taxes
Regulatory Liabilities [Line Items]
Regulatory Liabilities	3,546	4,005
Decommissioning the Regulatory Agreement Units
Regulatory Liabilities [Line Items]
Regulatory Liabilities	2,897	3,357
Removal costs
Regulatory Liabilities [Line Items]
Regulatory Liabilities	1,750	1,694
Over Recovered Energy and Natural Gas Costs [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities	87	113
Transmission formula rate annual reconciliations [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities	31	8
Renewable portfolio standards costs
Regulatory Liabilities [Line Items]
Regulatory Liabilities	810	500
Stranded costs
Regulatory Liabilities [Line Items]
Regulatory Liabilities	9	35
Energy efficiency and demand response programs RL
Regulatory Liabilities [Line Items]
Regulatory Liabilities	15
Over-recovered revenue decoupling
Regulatory Liabilities [Line Items]
Regulatory Liabilities	19
Dedicated facilities charge
Regulatory Liabilities [Line Items]
Regulatory Liabilities	110
Other
Regulatory Liabilities [Line Items]
Regulatory Liabilities	275	292
Commonwealth Edison Co [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities	7,139	6,944
Regulatory liabilities, current	226	185
Noncurrent regulatory liabilities	6,913	6,759
Commonwealth Edison Co [Member] \| Deferred income taxes
Regulatory Liabilities [Line Items]
Regulatory Liabilities	2,010	2,105
Commonwealth Edison Co [Member] \| Decommissioning the Regulatory Agreement Units
Regulatory Liabilities [Line Items]
Regulatory Liabilities	2,660	2,760
Commonwealth Edison Co [Member] \| Removal costs
Regulatory Liabilities [Line Items]
Regulatory Liabilities	1,604	1,541
Commonwealth Edison Co [Member] \| Over Recovered Energy and Natural Gas Costs [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities	11	25
Commonwealth Edison Co [Member] \| Transmission formula rate annual reconciliations [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities	3	7
Commonwealth Edison Co [Member] \| Renewable portfolio standards costs
Regulatory Liabilities [Line Items]
Regulatory Liabilities	810	500
Commonwealth Edison Co [Member] \| Renewable portfolio standards costs \| Illinois Commerce Commission
Regulatory Liabilities [Line Items]
Regulatory Liabilities	743
Commonwealth Edison Co [Member] \| Renewable portfolio standards costs \| Illinois Power Agency
Regulatory Liabilities [Line Items]
Regulatory Liabilities	67
Commonwealth Edison Co [Member] \| Stranded costs
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0	0
Commonwealth Edison Co [Member] \| Energy efficiency and demand response programs RL
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0
Commonwealth Edison Co [Member] \| Over-recovered revenue decoupling
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0
Commonwealth Edison Co [Member] \| Dedicated facilities charge
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0
Commonwealth Edison Co [Member] \| Other
Regulatory Liabilities [Line Items]
Regulatory Liabilities	41	6
PECO Energy Co [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities	345	729
Regulatory liabilities, current	75	94
Noncurrent regulatory liabilities	270	635
PECO Energy Co [Member] \| Deferred income taxes
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0	0
PECO Energy Co [Member] \| Decommissioning the Regulatory Agreement Units
Regulatory Liabilities [Line Items]
Regulatory Liabilities	237	597
PECO Energy Co [Member] \| Removal costs
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0	0
PECO Energy Co [Member] \| Over Recovered Energy and Natural Gas Costs [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities	65	71
PECO Energy Co [Member] \| Transmission formula rate annual reconciliations [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0	0
PECO Energy Co [Member] \| Renewable portfolio standards costs
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0	0
PECO Energy Co [Member] \| Stranded costs
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0	0
PECO Energy Co [Member] \| Energy efficiency and demand response programs RL
Regulatory Liabilities [Line Items]
Regulatory Liabilities	15
PECO Energy Co [Member] \| Over-recovered revenue decoupling
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0
PECO Energy Co [Member] \| Dedicated facilities charge
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0
PECO Energy Co [Member] \| Other
Regulatory Liabilities [Line Items]
Regulatory Liabilities	28	61
Baltimore Gas and Electric Company [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities	863	960
Regulatory liabilities, current	47	26
Noncurrent regulatory liabilities	816	934
Baltimore Gas and Electric Company [Member] \| Deferred income taxes
Regulatory Liabilities [Line Items]
Regulatory Liabilities	682	819
Baltimore Gas and Electric Company [Member] \| Decommissioning the Regulatory Agreement Units
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0	0
Baltimore Gas and Electric Company [Member] \| Removal costs
Regulatory Liabilities [Line Items]
Regulatory Liabilities	35	39
Baltimore Gas and Electric Company [Member] \| Over Recovered Energy and Natural Gas Costs [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities	4	0
Baltimore Gas and Electric Company [Member] \| Transmission formula rate annual reconciliations [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities	18	0
Baltimore Gas and Electric Company [Member] \| Renewable portfolio standards costs
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0	0
Baltimore Gas and Electric Company [Member] \| Stranded costs
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0	0
Baltimore Gas and Electric Company [Member] \| Energy efficiency and demand response programs RL
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0
Baltimore Gas and Electric Company [Member] \| Over-recovered revenue decoupling
Regulatory Liabilities [Line Items]
Regulatory Liabilities	4
Baltimore Gas and Electric Company [Member] \| Dedicated facilities charge
Regulatory Liabilities [Line Items]
Regulatory Liabilities	110
Baltimore Gas and Electric Company [Member] \| Other
Regulatory Liabilities [Line Items]
Regulatory Liabilities	10	102
Pepco Holdings LLC [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities	1,087	1,306
Regulatory liabilities, current	76	68
Noncurrent regulatory liabilities	1,011	1,238
Pepco Holdings LLC [Member] \| Deferred income taxes
Regulatory Liabilities [Line Items]
Regulatory Liabilities	854	1,081
Pepco Holdings LLC [Member] \| Decommissioning the Regulatory Agreement Units
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0	0
Pepco Holdings LLC [Member] \| Removal costs
Regulatory Liabilities [Line Items]
Regulatory Liabilities	111	114
Pepco Holdings LLC [Member] \| Over Recovered Energy and Natural Gas Costs [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities	7	17
Pepco Holdings LLC [Member] \| Transmission formula rate annual reconciliations [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities	10	1
Pepco Holdings LLC [Member] \| Renewable portfolio standards costs
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0	0
Pepco Holdings LLC [Member] \| Stranded costs
Regulatory Liabilities [Line Items]
Regulatory Liabilities	9	35
Pepco Holdings LLC [Member] \| Energy efficiency and demand response programs RL
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0
Pepco Holdings LLC [Member] \| Over-recovered revenue decoupling
Regulatory Liabilities [Line Items]
Regulatory Liabilities	15
Pepco Holdings LLC [Member] \| Dedicated facilities charge
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0
Pepco Holdings LLC [Member] \| Other
Regulatory Liabilities [Line Items]
Regulatory Liabilities	81	58
Potomac Electric Power Company [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities	461	563
Regulatory liabilities, current	6	14
Noncurrent regulatory liabilities	455	549
Potomac Electric Power Company [Member] \| Deferred income taxes
Regulatory Liabilities [Line Items]
Regulatory Liabilities	402	525
Potomac Electric Power Company [Member] \| Decommissioning the Regulatory Agreement Units
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0	0
Potomac Electric Power Company [Member] \| Removal costs
Regulatory Liabilities [Line Items]
Regulatory Liabilities	20	20
Potomac Electric Power Company [Member] \| Over Recovered Energy and Natural Gas Costs [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0	9
Potomac Electric Power Company [Member] \| Transmission formula rate annual reconciliations [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities	9	1
Potomac Electric Power Company [Member] \| Renewable portfolio standards costs
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0	0
Potomac Electric Power Company [Member] \| Stranded costs
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0	0
Potomac Electric Power Company [Member] \| Energy efficiency and demand response programs RL
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0
Potomac Electric Power Company [Member] \| Over-recovered revenue decoupling
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0
Potomac Electric Power Company [Member] \| Dedicated facilities charge
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0
Potomac Electric Power Company [Member] \| Other
Regulatory Liabilities [Line Items]
Regulatory Liabilities	30	8
Delmarva Power & Light Company [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities	424	466
Regulatory liabilities, current	44	25
Noncurrent regulatory liabilities	380	441
Delmarva Power & Light Company [Member] \| Deferred income taxes
Regulatory Liabilities [Line Items]
Regulatory Liabilities	304	354
Delmarva Power & Light Company [Member] \| Decommissioning the Regulatory Agreement Units
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0	0
Delmarva Power & Light Company [Member] \| Removal costs
Regulatory Liabilities [Line Items]
Regulatory Liabilities	91	94
Delmarva Power & Light Company [Member] \| Over Recovered Energy and Natural Gas Costs [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities	7	3
Delmarva Power & Light Company [Member] \| Transmission formula rate annual reconciliations [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities	1	0
Delmarva Power & Light Company [Member] \| Renewable portfolio standards costs
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0	0
Delmarva Power & Light Company [Member] \| Stranded costs
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0	0
Delmarva Power & Light Company [Member] \| Energy efficiency and demand response programs RL
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0
Delmarva Power & Light Company [Member] \| Over-recovered revenue decoupling
Regulatory Liabilities [Line Items]
Regulatory Liabilities	6
Delmarva Power & Light Company [Member] \| Dedicated facilities charge
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0
Delmarva Power & Light Company [Member] \| Other
Regulatory Liabilities [Line Items]
Regulatory Liabilities	15	15
Atlantic City Electric Company [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities	182	242
Regulatory liabilities, current	26	28
Noncurrent regulatory liabilities	156	214
Atlantic City Electric Company [Member] \| Deferred income taxes
Regulatory Liabilities [Line Items]
Regulatory Liabilities	148	202
Atlantic City Electric Company [Member] \| Decommissioning the Regulatory Agreement Units
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0	0
Atlantic City Electric Company [Member] \| Removal costs
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0	0
Atlantic City Electric Company [Member] \| Over Recovered Energy and Natural Gas Costs [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0	5
Atlantic City Electric Company [Member] \| Transmission formula rate annual reconciliations [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0	0
Atlantic City Electric Company [Member] \| Renewable portfolio standards costs
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0	0
Atlantic City Electric Company [Member] \| Stranded costs
Regulatory Liabilities [Line Items]
Regulatory Liabilities	9	24
Atlantic City Electric Company [Member] \| Energy efficiency and demand response programs RL
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0
Atlantic City Electric Company [Member] \| Over-recovered revenue decoupling
Regulatory Liabilities [Line Items]
Regulatory Liabilities	9
Atlantic City Electric Company [Member] \| Dedicated facilities charge
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0
Atlantic City Electric Company [Member] \| Other
Regulatory Liabilities [Line Items]
Regulatory Liabilities	$ 16	$ 11

Regulatory Matters - Capitalize

Regulatory Matters - Capitalized Ratemaking Amounts Not Recognized (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Public Utilities, Amount of Allowance for Earnings on Equity Capitalized for Rate Making Purposes	$ 57	$ 43
Commonwealth Edison Co [Member]
Public Utilities, Amount of Allowance for Earnings on Equity Capitalized for Rate Making Purposes	8	1
PECO Energy Co [Member]
Public Utilities, Amount of Allowance for Earnings on Equity Capitalized for Rate Making Purposes	0	0
Baltimore Gas and Electric Company [Member]
Public Utilities, Amount of Allowance for Earnings on Equity Capitalized for Rate Making Purposes	28	37
Pepco Holdings LLC [Member]
Public Utilities, Amount of Allowance for Earnings on Equity Capitalized for Rate Making Purposes	21	5
Potomac Electric Power Company [Member]
Public Utilities, Amount of Allowance for Earnings on Equity Capitalized for Rate Making Purposes	18	3
Delmarva Power & Light Company [Member]
Public Utilities, Amount of Allowance for Earnings on Equity Capitalized for Rate Making Purposes	2	2
Atlantic City Electric Company [Member]
Public Utilities, Amount of Allowance for Earnings on Equity Capitalized for Rate Making Purposes	$ 1	$ 0

Revenue from Contracts with C_3

Revenue from Contracts with Customers - Contract Liabilities (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Contract Liabilities [Roll Forward]
Beginning Balance - Contract Liabilities	$ 109	$ 118
Contract with Customer, Liability, Revenue Recognized	(8)	(9)
Ending Balance - Contract Liabilities	101	109
Pepco Holdings LLC [Member]
Contract Liabilities [Roll Forward]
Beginning Balance - Contract Liabilities	109	118
Contract with Customer, Liability, Revenue Recognized	(8)	(9)
Ending Balance - Contract Liabilities	101	109
Potomac Electric Power Company [Member]
Contract Liabilities [Roll Forward]
Beginning Balance - Contract Liabilities	87	94
Contract with Customer, Liability, Revenue Recognized	(6)	(7)
Ending Balance - Contract Liabilities	81	87
Delmarva Power & Light Company [Member]
Contract Liabilities [Roll Forward]
Beginning Balance - Contract Liabilities	11	12
Contract with Customer, Liability, Revenue Recognized	(1)	(1)
Ending Balance - Contract Liabilities	10	11
Atlantic City Electric Company [Member]
Contract Liabilities [Roll Forward]
Beginning Balance - Contract Liabilities	11	12
Contract with Customer, Liability, Revenue Recognized	(1)	(1)
Ending Balance - Contract Liabilities	$ 10	$ 11

Revenue from Contracts with C_4

Revenue from Contracts with Customers - Performance Obligations (Details) $ in Millions	Dec. 31, 2022 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 101
Pepco Holdings LLC [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	101
Potomac Electric Power Company [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	81
Delmarva Power & Light Company [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	10
Atlantic City Electric Company [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	10
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 8
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01 \| Pepco Holdings LLC [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 8
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01 \| Potomac Electric Power Company [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 6
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01 \| Delmarva Power & Light Company [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 1
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01 \| Atlantic City Electric Company [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 1
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 6
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01 \| Pepco Holdings LLC [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 6
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01 \| Potomac Electric Power Company [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 5
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01 \| Delmarva Power & Light Company [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 0
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01 \| Atlantic City Electric Company [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 1
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 5
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01 \| Pepco Holdings LLC [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 5
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01 \| Potomac Electric Power Company [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 5
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01 \| Delmarva Power & Light Company [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 0
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01 \| Atlantic City Electric Company [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 0
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 5
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01 \| Pepco Holdings LLC [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 5
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01 \| Potomac Electric Power Company [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 5
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01 \| Delmarva Power & Light Company [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 0
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01 \| Atlantic City Electric Company [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 0
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 77
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01 \| Pepco Holdings LLC [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 77
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01 \| Potomac Electric Power Company [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 60
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01 \| Delmarva Power & Light Company [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 9
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01 \| Atlantic City Electric Company [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 8
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year

Segment Information - Narrative

Segment Information - Narrative (Details)	12 Months Ended
Segment Information - Narrative (Details)	Dec. 31, 2022 Reportable_segment
Pepco Holdings LLC [Member]
Segment Reporting Information [Line Items]
Number of reportable segments	3
Exelon Consolidation
Segment Reporting Information [Line Items]
Number of reportable segments	6

Segment Information - Reconcili

Segment Information - Reconciliation to Consolidated Financial Statements (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Revenues	$ 19,078	$ 17,938	$ 16,663
Depreciation and amortization	3,325	3,033	2,891
Operating Expenses	15,761	15,256	14,485
Interest expense, net	1,447	1,289	1,307
Income taxes	349	38	(7)
Net income (loss)	2,171	1,829	1,954
Capital expenditures	7,147	7,981	8,048
Total assets	95,349	133,013
PECO Energy Co [Member]
Segment Reporting Information [Line Items]
Revenues	3,903	3,198	3,058
Operating revenues from affiliates	7	21	9
Income taxes	79	12	(30)
Net income (loss)	576	504	447
Capital expenditures	1,349	1,240	1,147
Total assets	14,502	13,824
Pepco Holdings LLC [Member]
Segment Reporting Information [Line Items]
Revenues	5,565	5,041	4,663
Operating revenues from affiliates	10	13	17
Income taxes	9	42	(77)
Net income (loss)	608	561	495
Capital expenditures	1,709	1,720	1,604
Total assets	26,082	24,744
Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues	19,078	17,938	16,663
Net income (loss)	2,054	1,616	1,099
Capital expenditures	6,921	6,640	6,289
Total assets	95,349	86,669
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Income taxes	(21)	(48)	11
Net income (loss)	2,170	1,706	1,963
Total assets	40,578	47,989
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenues	(1,869)	(2,261)	(2,095)
Operating revenues from affiliates	6	57	23
Depreciation and amortization	0	1	0
Operating Expenses	(1,762)	(1,587)	(1,502)
Interest expense, net	(3)	(1)	(3)
Income taxes	(11)	(161)	(153)
Net income (loss)	(34)	(443)	(446)
Capital expenditures	0	0	0
Total assets	(4,260)	(8,319)
Intersegment Eliminations [Member] \| Pepco Holdings LLC [Member]
Segment Reporting Information [Line Items]
Revenues	(383)	(380)	(374)
Operating revenues from affiliates	(383)	(381)	(375)
Depreciation and amortization	0	0	0
Operating Expenses	(383)	(381)	(375)
Interest expense, net	1	0	0
Income taxes	0	0	0
Net income (loss)	0	0	0
Capital expenditures	0	0	0
Total assets	(33)	(60)
Commonwealth Edison Co [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues	5,761	6,406	5,904
Depreciation and amortization	1,323	1,205	1,133
Operating Expenses	4,218	5,151	4,950
Interest expense, net	414	389	382
Income taxes	264	172	177
Net income (loss)	917	742	438
Capital expenditures	2,506	2,387	2,217
Total assets	39,661	36,470
Commonwealth Edison Co [Member] \| Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Operating revenues from affiliates	16	41	37
PECO Energy Co [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues	3,903	3,198	3,058
Depreciation and amortization	373	348	347
Operating Expenses	3,102	2,547	2,512
Interest expense, net	177	161	147
Income taxes	79	12	(30)
Net income (loss)	576	504	447
Capital expenditures	1,349	1,240	1,147
Total assets	14,502	13,824
PECO Energy Co [Member] \| Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Operating revenues from affiliates	7	21	9
Baltimore Gas and Electric Company [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues	3,895	3,341	3,098
Depreciation and amortization	630	591	550
Operating Expenses	3,376	2,860	2,598
Interest expense, net	152	138	133
Income taxes	8	(35)	41
Net income (loss)	380	408	349
Capital expenditures	1,262	1,226	1,247
Total assets	13,350	12,324
Baltimore Gas and Electric Company [Member] \| Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Operating revenues from affiliates	15	31	20
Pepco Holdings LLC [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues	5,565	5,041	4,663
Depreciation and amortization	938	821	782
Operating Expenses	4,734	4,240	4,045
Interest expense, net	292	267	268
Income taxes	9	42	(77)
Net income (loss)	608	561	495
Capital expenditures	1,709	1,720	1,604
Total assets	26,082	24,744
Pepco Holdings LLC [Member] \| Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Operating revenues from affiliates	10	13	17
Potomac Electric Power Company [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues	2,531	2,274	2,149
Depreciation and amortization	417	403	377
Operating Expenses	2,140	1,871	1,799
Interest expense, net	150	140	138
Income taxes	(9)	15	(7)
Net income (loss)	305	296	266
Capital expenditures	874	843	773
Total assets	10,657	9,903
Potomac Electric Power Company [Member] \| Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Operating revenues from affiliates	5	5	7
Delmarva Power & Light Company [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues	1,595	1,380	1,271
Depreciation and amortization	232	210	191
Operating Expenses	1,359	1,161	1,120
Interest expense, net	66	61	61
Income taxes	14	42	(25)
Net income (loss)	169	128	125
Capital expenditures	430	429	424
Total assets	5,802	5,412
Delmarva Power & Light Company [Member] \| Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Operating revenues from affiliates	6	7	9
Atlantic City Electric Company [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues	1,431	1,388	1,245
Depreciation and amortization	261	179	180
Operating Expenses	1,225	1,201	1,123
Interest expense, net	66	58	59
Income taxes	3	(13)	(41)
Net income (loss)	148	146	112
Capital expenditures	398	445	401
Total assets	4,979	4,556
Atlantic City Electric Company [Member] \| Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Operating revenues from affiliates	2	2	4
Corporate and Other [Member] \| Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Revenues	1,823	2,213	2,035
Depreciation and amortization	61	67	79
Operating Expenses	2,093	2,045	1,882
Interest expense, net	415	335	380
Income taxes	0	8	35
Net income (loss)	(393)	(156)	(184)
Capital expenditures	95	67	74
Total assets	6,014	7,626
Corporate and Other [Member] \| Corporate, Non-Segment [Member] \| Pepco Holdings LLC [Member]
Segment Reporting Information [Line Items]
Revenues	391	379	372
Depreciation and amortization	28	29	34
Operating Expenses	393	388	378
Interest expense, net	9	8	10
Income taxes	1	(2)	(4)
Net income (loss)	(14)	(9)	(8)
Capital expenditures	7	3	6
Total assets	4,677	4,933
Corporate and Other [Member] \| Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Operating revenues from affiliates	1,823	2,203	2,024
Corporate and Other [Member] \| Intersegment Eliminations [Member] \| Pepco Holdings LLC [Member]
Segment Reporting Information [Line Items]
Operating revenues from affiliates	380	380	372
Segment Elimination [Member] \| Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Operating revenues from affiliates	(1,865)	(2,252)	(2,084)
Electricity, US Regulated [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	16,899	16,245	15,236
Electricity, US Regulated [Member] \| PECO Energy Co [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	3,156	2,613	2,519
Electricity, US Regulated [Member] \| Pepco Holdings LLC [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	5,376	4,769	4,463
Electricity, US Regulated [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	17,083	16,395	15,224
Electricity, US Regulated [Member] \| Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	(31)	(35)	(44)
Electricity, US Regulated [Member] \| Intersegment Eliminations [Member] \| Pepco Holdings LLC [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	(2)	(14)	(18)
Electricity, US Regulated [Member] \| Commonwealth Edison Co [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	5,761	6,406	5,904
Electricity, US Regulated [Member] \| PECO Energy Co [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	3,165	2,659	2,543
Electricity, US Regulated [Member] \| Baltimore Gas and Electric Company [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	2,871	2,505	2,336
Electricity, US Regulated [Member] \| Pepco Holdings LLC [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	5,317	4,860	4,485
Electricity, US Regulated [Member] \| Potomac Electric Power Company [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	2,531	2,274	2,149
Electricity, US Regulated [Member] \| Delmarva Power & Light Company [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	1,357	1,212	1,109
Electricity, US Regulated [Member] \| Atlantic City Electric Company [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	1,431	1,388	1,245
Electricity, US Regulated [Member] \| Corporate and Other [Member] \| Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	0	0	0
Electricity, US Regulated [Member] \| Corporate and Other [Member] \| Corporate, Non-Segment [Member] \| Pepco Holdings LLC [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	0	0	0
Natural Gas, US Regulated [Member] \| PECO Energy Co [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	738	538	514
Natural Gas, US Regulated [Member] \| Pepco Holdings LLC [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	238	168	162
Natural Gas, US Regulated [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	1,995	1,543	1,439
Natural Gas, US Regulated [Member] \| Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	(5)	0	0
Natural Gas, US Regulated [Member] \| Intersegment Eliminations [Member] \| Pepco Holdings LLC [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	0	0	0
Natural Gas, US Regulated [Member] \| Commonwealth Edison Co [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	0	0	0
Natural Gas, US Regulated [Member] \| PECO Energy Co [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	738	539	515
Natural Gas, US Regulated [Member] \| Baltimore Gas and Electric Company [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	1,024	836	762
Natural Gas, US Regulated [Member] \| Pepco Holdings LLC [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	238	168	162
Natural Gas, US Regulated [Member] \| Potomac Electric Power Company [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	0	0	0
Natural Gas, US Regulated [Member] \| Delmarva Power & Light Company [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	238	168	162
Natural Gas, US Regulated [Member] \| Atlantic City Electric Company [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	0	0	0
Natural Gas, US Regulated [Member] \| Corporate and Other [Member] \| Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	0	0	0
Natural Gas, US Regulated [Member] \| Corporate and Other [Member] \| Corporate, Non-Segment [Member] \| Pepco Holdings LLC [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	0	0	0
Service, Other [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	0	0	0
Service, Other [Member] \| Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	(1,833)	(2,226)	(2,051)
Service, Other [Member] \| Intersegment Eliminations [Member] \| Pepco Holdings LLC [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	(381)	(366)	(356)
Service, Other [Member] \| Commonwealth Edison Co [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	0	0	0
Service, Other [Member] \| PECO Energy Co [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	0	0	0
Service, Other [Member] \| Baltimore Gas and Electric Company [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	0	0	0
Service, Other [Member] \| Pepco Holdings LLC [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	10	13	16
Service, Other [Member] \| Potomac Electric Power Company [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	0	0	0
Service, Other [Member] \| Delmarva Power & Light Company [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	0	0	0
Service, Other [Member] \| Atlantic City Electric Company [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	0	0	0
Service, Other [Member] \| Corporate and Other [Member] \| Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	1,823	2,213	2,035
Service, Other [Member] \| Corporate and Other [Member] \| Corporate, Non-Segment [Member] \| Pepco Holdings LLC [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	$ 391	$ 379	$ 372

Segment Information - Electric

Segment Information - Electric and Gas Revenue by Customer Class (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Revenue, Major Customer [Line Items]
Revenues	$ 19,078	$ 17,938	$ 16,663
Operating Segments [Member]
Revenue, Major Customer [Line Items]
Revenues	19,078	17,938	16,663
Operating Segments [Member] \| Pepco Holdings LLC [Member]
Revenue, Major Customer [Line Items]
Revenues	5,565	5,041	4,663
Commonwealth Edison Co [Member]
Revenue, Major Customer [Line Items]
Revenues	5,761	6,406	5,904
Revenue from Related Parties	16	41	37
Commonwealth Edison Co [Member] \| Regulated Operation [Member]
Revenue, Major Customer [Line Items]
Revenues	5,466	6,334	5,933
Commonwealth Edison Co [Member] \| Other Regulated Revenue [Member]
Revenue, Major Customer [Line Items]
Revenues	295	72	(29)
PECO Energy Co [Member]
Revenue, Major Customer [Line Items]
Revenues	3,903	3,198	3,058
Revenue from Related Parties	7	21	9
PECO Energy Co [Member] \| Rate-Regulated Electric Revenues [Member]
Revenue, Major Customer [Line Items]
Revenue from Related Parties	7	20	8
PECO Energy Co [Member] \| Regulated Operation [Member]
Revenue, Major Customer [Line Items]
Revenues	3,883	3,168	3,039
PECO Energy Co [Member] \| Other Regulated Revenue [Member]
Revenue, Major Customer [Line Items]
Revenues	20	30	19
PECO Energy Co [Member] \| Rate-Regulated Natural Gas Revenues [Member]
Revenue, Major Customer [Line Items]
Revenue from Related Parties	0	1	1
Baltimore Gas and Electric Company [Member]
Revenue, Major Customer [Line Items]
Revenues	3,895	3,341	3,098
Revenue from Related Parties	15	31	20
Baltimore Gas and Electric Company [Member] \| Rate-Regulated Electric Revenues [Member]
Revenue, Major Customer [Line Items]
Revenue from Related Parties	7	13	10
Baltimore Gas and Electric Company [Member] \| Regulated Operation [Member]
Revenue, Major Customer [Line Items]
Revenues	3,923	3,315	3,075
Baltimore Gas and Electric Company [Member] \| Other Regulated Revenue [Member]
Revenue, Major Customer [Line Items]
Revenues	(28)	26	23
Baltimore Gas and Electric Company [Member] \| Rate-Regulated Natural Gas Revenues [Member]
Revenue, Major Customer [Line Items]
Revenue from Related Parties	8	18	10
Pepco Holdings LLC [Member]
Revenue, Major Customer [Line Items]
Revenues	5,565	5,041	4,663
Revenue from Related Parties	10	13	17
Pepco Holdings LLC [Member] \| Regulated Operation [Member]
Revenue, Major Customer [Line Items]
Revenues	5,616	4,945	4,640
Pepco Holdings LLC [Member] \| Other Regulated Revenue [Member]
Revenue, Major Customer [Line Items]
Revenues	(51)	96	23
Potomac Electric Power Company [Member]
Revenue, Major Customer [Line Items]
Revenues	2,531	2,274	2,149
Revenue from Related Parties	5	5	7
Potomac Electric Power Company [Member] \| Regulated Operation [Member]
Revenue, Major Customer [Line Items]
Revenues	2,556	2,218	2,108
Potomac Electric Power Company [Member] \| Other Regulated Revenue [Member]
Revenue, Major Customer [Line Items]
Revenues	(25)	56	41
Delmarva Power & Light Company [Member]
Revenue, Major Customer [Line Items]
Revenues	1,595	1,380	1,271
Revenue from Related Parties	6	7	9
Delmarva Power & Light Company [Member] \| Regulated Operation [Member]
Revenue, Major Customer [Line Items]
Revenues	1,602	1,364	1,277
Delmarva Power & Light Company [Member] \| Other Regulated Revenue [Member]
Revenue, Major Customer [Line Items]
Revenues	(7)	16	(6)
Atlantic City Electric Company [Member]
Revenue, Major Customer [Line Items]
Revenues	1,431	1,388	1,245
Revenue from Related Parties	2	2	4
Atlantic City Electric Company [Member] \| Regulated Operation [Member]
Revenue, Major Customer [Line Items]
Revenues	1,450	1,364	1,257
Atlantic City Electric Company [Member] \| Other Regulated Revenue [Member]
Revenue, Major Customer [Line Items]
Revenues	(19)	24	(12)
Electricity, US Regulated [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	16,899	16,245	15,236
Electricity, US Regulated [Member] \| Operating Segments [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	17,083	16,395	15,224
Electricity, US Regulated [Member] \| Operating Segments [Member] \| Pepco Holdings LLC [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	5,317	4,860	4,485
Electricity, US Regulated [Member] \| Commonwealth Edison Co [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	5,478	6,323	5,914
Electricity, US Regulated [Member] \| Commonwealth Edison Co [Member] \| Regulated Operation [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	5,466	6,334	5,933
Electricity, US Regulated [Member] \| Commonwealth Edison Co [Member] \| Regulated Operation [Member] \| Residential [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	3,304	3,233	3,090
Electricity, US Regulated [Member] \| Commonwealth Edison Co [Member] \| Regulated Operation [Member] \| Small Commercial & Industrial [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	1,173	1,571	1,399
Electricity, US Regulated [Member] \| Commonwealth Edison Co [Member] \| Regulated Operation [Member] \| Large Commercial & Industrial [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	5	559	515
Electricity, US Regulated [Member] \| Commonwealth Edison Co [Member] \| Regulated Operation [Member] \| Public Authorities & Electric Railroads [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	29	45	45
Electricity, US Regulated [Member] \| Commonwealth Edison Co [Member] \| Regulated Operation [Member] \| Other [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	955	926	884
Electricity, US Regulated [Member] \| Commonwealth Edison Co [Member] \| Regulated Operation [Member] \| Operating Segments [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	28	30	18
Electricity, US Regulated [Member] \| PECO Energy Co [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	3,156	2,613	2,519
Electricity, US Regulated [Member] \| PECO Energy Co [Member] \| Regulated Operation [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	3,147	2,629	2,524
Electricity, US Regulated [Member] \| PECO Energy Co [Member] \| Regulated Operation [Member] \| Residential [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	2,026	1,704	1,656
Electricity, US Regulated [Member] \| PECO Energy Co [Member] \| Regulated Operation [Member] \| Small Commercial & Industrial [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	521	422	386
Electricity, US Regulated [Member] \| PECO Energy Co [Member] \| Regulated Operation [Member] \| Large Commercial & Industrial [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	299	243	228
Electricity, US Regulated [Member] \| PECO Energy Co [Member] \| Regulated Operation [Member] \| Public Authorities & Electric Railroads [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	30	31	29
Electricity, US Regulated [Member] \| PECO Energy Co [Member] \| Regulated Operation [Member] \| Other [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	271	229	225
Electricity, US Regulated [Member] \| PECO Energy Co [Member] \| Regulated Operation [Member] \| Operating Segments [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	16	4	3
Electricity, US Regulated [Member] \| Baltimore Gas and Electric Company [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	2,890	2,497	2,323
Electricity, US Regulated [Member] \| Baltimore Gas and Electric Company [Member] \| Regulated Operation [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	2,883	2,499	2,328
Electricity, US Regulated [Member] \| Baltimore Gas and Electric Company [Member] \| Regulated Operation [Member] \| Residential [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	1,564	1,375	1,345
Electricity, US Regulated [Member] \| Baltimore Gas and Electric Company [Member] \| Regulated Operation [Member] \| Small Commercial & Industrial [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	327	267	241
Electricity, US Regulated [Member] \| Baltimore Gas and Electric Company [Member] \| Regulated Operation [Member] \| Large Commercial & Industrial [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	567	459	406
Electricity, US Regulated [Member] \| Baltimore Gas and Electric Company [Member] \| Regulated Operation [Member] \| Public Authorities & Electric Railroads [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	27	27	27
Electricity, US Regulated [Member] \| Baltimore Gas and Electric Company [Member] \| Regulated Operation [Member] \| Other [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	398	371	309
Electricity, US Regulated [Member] \| Baltimore Gas and Electric Company [Member] \| Regulated Operation [Member] \| Operating Segments [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	14	11	5
Electricity, US Regulated [Member] \| Pepco Holdings LLC [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	5,376	4,769	4,463
Electricity, US Regulated [Member] \| Pepco Holdings LLC [Member] \| Regulated Operation [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	5,378	4,777	4,478
Electricity, US Regulated [Member] \| Pepco Holdings LLC [Member] \| Regulated Operation [Member] \| Residential [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	2,590	2,441	2,332
Electricity, US Regulated [Member] \| Pepco Holdings LLC [Member] \| Regulated Operation [Member] \| Small Commercial & Industrial [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	607	521	472
Electricity, US Regulated [Member] \| Pepco Holdings LLC [Member] \| Regulated Operation [Member] \| Large Commercial & Industrial [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	1,422	1,123	1,001
Electricity, US Regulated [Member] \| Pepco Holdings LLC [Member] \| Regulated Operation [Member] \| Public Authorities & Electric Railroads [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	64	58	60
Electricity, US Regulated [Member] \| Pepco Holdings LLC [Member] \| Regulated Operation [Member] \| Other [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	695	634	613
Electricity, US Regulated [Member] \| Pepco Holdings LLC [Member] \| Regulated Operation [Member] \| Operating Segments [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	8	5	2
Electricity, US Regulated [Member] \| Potomac Electric Power Company [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	2,557	2,216	2,102
Electricity, US Regulated [Member] \| Potomac Electric Power Company [Member] \| Regulated Operation [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	2,556	2,218	2,108
Electricity, US Regulated [Member] \| Potomac Electric Power Company [Member] \| Regulated Operation [Member] \| Residential [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	1,076	1,003	988
Electricity, US Regulated [Member] \| Potomac Electric Power Company [Member] \| Regulated Operation [Member] \| Small Commercial & Industrial [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	155	135	132
Electricity, US Regulated [Member] \| Potomac Electric Power Company [Member] \| Regulated Operation [Member] \| Large Commercial & Industrial [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	1,083	844	736
Electricity, US Regulated [Member] \| Potomac Electric Power Company [Member] \| Regulated Operation [Member] \| Public Authorities & Electric Railroads [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	34	31	34
Electricity, US Regulated [Member] \| Potomac Electric Power Company [Member] \| Regulated Operation [Member] \| Other [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	208	205	218
Electricity, US Regulated [Member] \| Potomac Electric Power Company [Member] \| Regulated Operation [Member] \| Operating Segments [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	6	3	1
Electricity, US Regulated [Member] \| Delmarva Power & Light Company [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	1,360	1,191	1,107
Electricity, US Regulated [Member] \| Delmarva Power & Light Company [Member] \| Regulated Operation [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	1,364	1,196	1,115
Electricity, US Regulated [Member] \| Delmarva Power & Light Company [Member] \| Regulated Operation [Member] \| Residential [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	750	694	652
Electricity, US Regulated [Member] \| Delmarva Power & Light Company [Member] \| Regulated Operation [Member] \| Small Commercial & Industrial [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	235	193	171
Electricity, US Regulated [Member] \| Delmarva Power & Light Company [Member] \| Regulated Operation [Member] \| Large Commercial & Industrial [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	137	94	89
Electricity, US Regulated [Member] \| Delmarva Power & Light Company [Member] \| Regulated Operation [Member] \| Public Authorities & Electric Railroads [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	15	14	13
Electricity, US Regulated [Member] \| Delmarva Power & Light Company [Member] \| Regulated Operation [Member] \| Other [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	227	201	190
Electricity, US Regulated [Member] \| Delmarva Power & Light Company [Member] \| Regulated Operation [Member] \| Operating Segments [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	2	2	1
Electricity, US Regulated [Member] \| Atlantic City Electric Company [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	1,448	1,362	1,253
Electricity, US Regulated [Member] \| Atlantic City Electric Company [Member] \| Regulated Operation [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	1,450	1,364	1,257
Electricity, US Regulated [Member] \| Atlantic City Electric Company [Member] \| Regulated Operation [Member] \| Residential [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	764	744	692
Electricity, US Regulated [Member] \| Atlantic City Electric Company [Member] \| Regulated Operation [Member] \| Small Commercial & Industrial [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	217	193	169
Electricity, US Regulated [Member] \| Atlantic City Electric Company [Member] \| Regulated Operation [Member] \| Large Commercial & Industrial [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	202	185	176
Electricity, US Regulated [Member] \| Atlantic City Electric Company [Member] \| Regulated Operation [Member] \| Public Authorities & Electric Railroads [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	15	13	13
Electricity, US Regulated [Member] \| Atlantic City Electric Company [Member] \| Regulated Operation [Member] \| Other [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	252	229	207
Electricity, US Regulated [Member] \| Atlantic City Electric Company [Member] \| Regulated Operation [Member] \| Operating Segments [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	0	0	0
Natural Gas, US Regulated [Member] \| Operating Segments [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	1,995	1,543	1,439
Natural Gas, US Regulated [Member] \| Operating Segments [Member] \| Pepco Holdings LLC [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	238	168	162
Natural Gas, US Regulated [Member] \| Commonwealth Edison Co [Member] \| Regulated Operation [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	0	0	0
Natural Gas, US Regulated [Member] \| Commonwealth Edison Co [Member] \| Regulated Operation [Member] \| Residential [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	0	0	0
Natural Gas, US Regulated [Member] \| Commonwealth Edison Co [Member] \| Regulated Operation [Member] \| Small Commercial & Industrial [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	0	0	0
Natural Gas, US Regulated [Member] \| Commonwealth Edison Co [Member] \| Regulated Operation [Member] \| Large Commercial & Industrial [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	0	0	0
Natural Gas, US Regulated [Member] \| Commonwealth Edison Co [Member] \| Regulated Operation [Member] \| Transportation [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	0	0	0
Natural Gas, US Regulated [Member] \| Commonwealth Edison Co [Member] \| Regulated Operation [Member] \| Other [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	0	0	0
Natural Gas, US Regulated [Member] \| Commonwealth Edison Co [Member] \| Regulated Operation [Member] \| Operating Segments [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	0	0	0
Natural Gas, US Regulated [Member] \| PECO Energy Co [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	738	538	514
Natural Gas, US Regulated [Member] \| PECO Energy Co [Member] \| Regulated Operation [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	736	539	515
Natural Gas, US Regulated [Member] \| PECO Energy Co [Member] \| Regulated Operation [Member] \| Residential [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	512	372	361
Natural Gas, US Regulated [Member] \| PECO Energy Co [Member] \| Regulated Operation [Member] \| Small Commercial & Industrial [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	186	136	126
Natural Gas, US Regulated [Member] \| PECO Energy Co [Member] \| Regulated Operation [Member] \| Large Commercial & Industrial [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	0	0	0
Natural Gas, US Regulated [Member] \| PECO Energy Co [Member] \| Regulated Operation [Member] \| Transportation [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	26	24	24
Natural Gas, US Regulated [Member] \| PECO Energy Co [Member] \| Regulated Operation [Member] \| Other [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	12	7	4
Natural Gas, US Regulated [Member] \| PECO Energy Co [Member] \| Regulated Operation [Member] \| Operating Segments [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	2	0	0
Natural Gas, US Regulated [Member] \| Baltimore Gas and Electric Company [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	1,037	801	739
Natural Gas, US Regulated [Member] \| Baltimore Gas and Electric Company [Member] \| Regulated Operation [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	1,040	816	747
Natural Gas, US Regulated [Member] \| Baltimore Gas and Electric Company [Member] \| Regulated Operation [Member] \| Residential [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	678	518	504
Natural Gas, US Regulated [Member] \| Baltimore Gas and Electric Company [Member] \| Regulated Operation [Member] \| Small Commercial & Industrial [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	111	83	79
Natural Gas, US Regulated [Member] \| Baltimore Gas and Electric Company [Member] \| Regulated Operation [Member] \| Large Commercial & Industrial [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	183	147	135
Natural Gas, US Regulated [Member] \| Baltimore Gas and Electric Company [Member] \| Regulated Operation [Member] \| Transportation [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	0	0	0
Natural Gas, US Regulated [Member] \| Baltimore Gas and Electric Company [Member] \| Regulated Operation [Member] \| Other [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	68	68	29
Natural Gas, US Regulated [Member] \| Baltimore Gas and Electric Company [Member] \| Regulated Operation [Member] \| Operating Segments [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	5	3	2
Natural Gas, US Regulated [Member] \| Pepco Holdings LLC [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	238	168	162
Natural Gas, US Regulated [Member] \| Pepco Holdings LLC [Member] \| Regulated Operation [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	238	168	162
Natural Gas, US Regulated [Member] \| Pepco Holdings LLC [Member] \| Regulated Operation [Member] \| Residential [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	127	97	96
Natural Gas, US Regulated [Member] \| Pepco Holdings LLC [Member] \| Regulated Operation [Member] \| Small Commercial & Industrial [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	55	42	42
Natural Gas, US Regulated [Member] \| Pepco Holdings LLC [Member] \| Regulated Operation [Member] \| Large Commercial & Industrial [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	12	7	4
Natural Gas, US Regulated [Member] \| Pepco Holdings LLC [Member] \| Regulated Operation [Member] \| Transportation [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	15	14	14
Natural Gas, US Regulated [Member] \| Pepco Holdings LLC [Member] \| Regulated Operation [Member] \| Other [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	29	8	6
Natural Gas, US Regulated [Member] \| Pepco Holdings LLC [Member] \| Regulated Operation [Member] \| Operating Segments [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	0	0	0
Natural Gas, US Regulated [Member] \| Potomac Electric Power Company [Member] \| Regulated Operation [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	0	0	0
Natural Gas, US Regulated [Member] \| Potomac Electric Power Company [Member] \| Regulated Operation [Member] \| Residential [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	0	0	0
Natural Gas, US Regulated [Member] \| Potomac Electric Power Company [Member] \| Regulated Operation [Member] \| Small Commercial & Industrial [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	0	0	0
Natural Gas, US Regulated [Member] \| Potomac Electric Power Company [Member] \| Regulated Operation [Member] \| Large Commercial & Industrial [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	0	0	0
Natural Gas, US Regulated [Member] \| Potomac Electric Power Company [Member] \| Regulated Operation [Member] \| Transportation [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	0	0	0
Natural Gas, US Regulated [Member] \| Potomac Electric Power Company [Member] \| Regulated Operation [Member] \| Other [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	0	0	0
Natural Gas, US Regulated [Member] \| Potomac Electric Power Company [Member] \| Regulated Operation [Member] \| Operating Segments [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	0	0	0
Natural Gas, US Regulated [Member] \| Delmarva Power & Light Company [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	238	168	162
Natural Gas, US Regulated [Member] \| Delmarva Power & Light Company [Member] \| Regulated Operation [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	238	168	162
Natural Gas, US Regulated [Member] \| Delmarva Power & Light Company [Member] \| Regulated Operation [Member] \| Residential [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	127	97	96
Natural Gas, US Regulated [Member] \| Delmarva Power & Light Company [Member] \| Regulated Operation [Member] \| Small Commercial & Industrial [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	55	42	42
Natural Gas, US Regulated [Member] \| Delmarva Power & Light Company [Member] \| Regulated Operation [Member] \| Large Commercial & Industrial [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	12	7	4
Natural Gas, US Regulated [Member] \| Delmarva Power & Light Company [Member] \| Regulated Operation [Member] \| Transportation [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	15	14	14
Natural Gas, US Regulated [Member] \| Delmarva Power & Light Company [Member] \| Regulated Operation [Member] \| Other [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	29	8	6
Natural Gas, US Regulated [Member] \| Delmarva Power & Light Company [Member] \| Regulated Operation [Member] \| Operating Segments [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	0	0	0
Natural Gas, US Regulated [Member] \| Atlantic City Electric Company [Member] \| Regulated Operation [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	0	0	0
Natural Gas, US Regulated [Member] \| Atlantic City Electric Company [Member] \| Regulated Operation [Member] \| Residential [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	0	0	0
Natural Gas, US Regulated [Member] \| Atlantic City Electric Company [Member] \| Regulated Operation [Member] \| Small Commercial & Industrial [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	0	0	0
Natural Gas, US Regulated [Member] \| Atlantic City Electric Company [Member] \| Regulated Operation [Member] \| Large Commercial & Industrial [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	0	0	0
Natural Gas, US Regulated [Member] \| Atlantic City Electric Company [Member] \| Regulated Operation [Member] \| Transportation [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	0	0	0
Natural Gas, US Regulated [Member] \| Atlantic City Electric Company [Member] \| Regulated Operation [Member] \| Other [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	0	0	0
Natural Gas, US Regulated [Member] \| Atlantic City Electric Company [Member] \| Regulated Operation [Member] \| Operating Segments [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	0	0	0
Alternative Revenue [Member] \| Commonwealth Edison Co [Member] \| Operating Segments [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	267	42	(47)
Alternative Revenue [Member] \| PECO Energy Co [Member] \| Operating Segments [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	2	26	16
Alternative Revenue [Member] \| Baltimore Gas and Electric Company [Member] \| Operating Segments [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	(47)	12	16
Alternative Revenue [Member] \| Pepco Holdings LLC [Member] \| Operating Segments [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	(59)	91	21
Alternative Revenue [Member] \| Potomac Electric Power Company [Member] \| Operating Segments [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	(31)	53	40
Alternative Revenue [Member] \| Delmarva Power & Light Company [Member] \| Operating Segments [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	(9)	14	(7)
Alternative Revenue [Member] \| Atlantic City Electric Company [Member] \| Operating Segments [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	$ (19)	$ 24	$ (12)

Accounts Receivable - Allowance

Accounts Receivable - Allowance for Credit Losses Rollforward (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Accounts Receivable, Allowance for Credit Loss [Line Items]
Current Period Provision for Expected Credit Losses	$ (173)	$ (160)	$ (150)
Commonwealth Edison Co [Member]
Accounts Receivable, Allowance for Credit Loss [Line Items]
Current Period Provision for Expected Credit Losses	(46)	(47)	(32)
PECO Energy Co [Member]
Accounts Receivable, Allowance for Credit Loss [Line Items]
Current Period Provision for Expected Credit Losses	(45)	(39)	(42)
Baltimore Gas and Electric Company [Member]
Accounts Receivable, Allowance for Credit Loss [Line Items]
Current Period Provision for Expected Credit Losses	(25)	(17)	(15)
Pepco Holdings LLC [Member]
Accounts Receivable, Allowance for Credit Loss [Line Items]
Current Period Provision for Expected Credit Losses	(58)	(24)	(43)
Potomac Electric Power Company [Member]
Accounts Receivable, Allowance for Credit Loss [Line Items]
Current Period Provision for Expected Credit Losses	(29)	(9)	(24)
Delmarva Power & Light Company [Member]
Accounts Receivable, Allowance for Credit Loss [Line Items]
Current Period Provision for Expected Credit Losses	(12)	(5)	(16)
Atlantic City Electric Company [Member]
Accounts Receivable, Allowance for Credit Loss [Line Items]
Current Period Provision for Expected Credit Losses	(16)	(10)	(2)
Customer accounts receivable
Accounts Receivable, Allowance for Credit Loss [Line Items]
Beginning balance	320	334
Current Period Provision for Expected Credit Losses	176	96
Writeoffs, net of recoveries	169	110
Ending balance	327	320	334
Customer accounts receivable \| Commonwealth Edison Co [Member]
Accounts Receivable, Allowance for Credit Loss [Line Items]
Beginning balance	73	97
Current Period Provision for Expected Credit Losses	29	21
Writeoffs, net of recoveries	43	45
Ending balance	59	73	97
Customer accounts receivable \| PECO Energy Co [Member]
Accounts Receivable, Allowance for Credit Loss [Line Items]
Beginning balance	105	116
Current Period Provision for Expected Credit Losses	52	23
Writeoffs, net of recoveries	52	34
Ending balance	105	105	116
Customer accounts receivable \| Baltimore Gas and Electric Company [Member]
Accounts Receivable, Allowance for Credit Loss [Line Items]
Beginning balance	38	35
Current Period Provision for Expected Credit Losses	37	15
Writeoffs, net of recoveries	21	12
Ending balance	54	38	35
Customer accounts receivable \| Pepco Holdings LLC [Member]
Accounts Receivable, Allowance for Credit Loss [Line Items]
Beginning balance	104	86
Current Period Provision for Expected Credit Losses	58	37
Writeoffs, net of recoveries	53	19
Ending balance	109	104	86
Customer accounts receivable \| Potomac Electric Power Company [Member]
Accounts Receivable, Allowance for Credit Loss [Line Items]
Beginning balance	37	32
Current Period Provision for Expected Credit Losses	31	13
Writeoffs, net of recoveries	21	8
Ending balance	47	37	32
Customer accounts receivable \| Delmarva Power & Light Company [Member]
Accounts Receivable, Allowance for Credit Loss [Line Items]
Beginning balance	18	22
Current Period Provision for Expected Credit Losses	12	6
Writeoffs, net of recoveries	9	10
Ending balance	21	18	22
Customer accounts receivable \| Atlantic City Electric Company [Member]
Accounts Receivable, Allowance for Credit Loss [Line Items]
Beginning balance	49	32
Current Period Provision for Expected Credit Losses	15	18
Writeoffs, net of recoveries	23	1
Ending balance	41	49	32
Other Receivables
Accounts Receivable, Allowance for Credit Loss [Line Items]
Beginning balance	72	71
Current Period Provision for Expected Credit Losses	26	11
Writeoffs, net of recoveries	16	10
Ending balance	82	72	71
Other Receivables \| Commonwealth Edison Co [Member]
Accounts Receivable, Allowance for Credit Loss [Line Items]
Beginning balance	17	21
Current Period Provision for Expected Credit Losses	3	(2)
Writeoffs, net of recoveries	3	2
Ending balance	17	17	21
Other Receivables \| PECO Energy Co [Member]
Accounts Receivable, Allowance for Credit Loss [Line Items]
Beginning balance	7	8
Current Period Provision for Expected Credit Losses	6	3
Writeoffs, net of recoveries	4	4
Ending balance	9	7	8
Other Receivables \| Baltimore Gas and Electric Company [Member]
Accounts Receivable, Allowance for Credit Loss [Line Items]
Beginning balance	9	9
Current Period Provision for Expected Credit Losses	6	4
Writeoffs, net of recoveries	5	4
Ending balance	10	9	9
Other Receivables \| Pepco Holdings LLC [Member]
Accounts Receivable, Allowance for Credit Loss [Line Items]
Beginning balance	39	33
Current Period Provision for Expected Credit Losses	11	6
Writeoffs, net of recoveries	4	0
Ending balance	46	39	33
Other Receivables \| Potomac Electric Power Company [Member]
Accounts Receivable, Allowance for Credit Loss [Line Items]
Beginning balance	16	13
Current Period Provision for Expected Credit Losses	9	3
Writeoffs, net of recoveries	0	0
Ending balance	25	16	13
Other Receivables \| Delmarva Power & Light Company [Member]
Accounts Receivable, Allowance for Credit Loss [Line Items]
Beginning balance	8	9
Current Period Provision for Expected Credit Losses	(1)	(1)
Writeoffs, net of recoveries	0	0
Ending balance	7	8	9
Other Receivables \| Atlantic City Electric Company [Member]
Accounts Receivable, Allowance for Credit Loss [Line Items]
Beginning balance	15	11
Current Period Provision for Expected Credit Losses	3	4
Writeoffs, net of recoveries	4	0
Ending balance	$ 14	$ 15	$ 11

Accounts Receivable - Unbilled

Accounts Receivable - Unbilled Customer Revenue (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unbilled customer revenues	$ 912	$ 747
Commonwealth Edison Co [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unbilled customer revenues	223	240
PECO Energy Co [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unbilled customer revenues	219	161
Baltimore Gas and Electric Company [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unbilled customer revenues	247	171
Pepco Holdings LLC [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unbilled customer revenues	223	175
Potomac Electric Power Company [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unbilled customer revenues	103	82
Delmarva Power & Light Company [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unbilled customer revenues	74	53
Atlantic City Electric Company [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unbilled customer revenues	$ 46	$ 40

Accounts Receivable - Purchases

Accounts Receivable - Purchases and Sales of Accounts Receivable (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable, Purchase	$ 3,981	$ 3,840
Commonwealth Edison Co [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable, Purchase	965	1,031
PECO Energy Co [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable, Purchase	1,081	1,041
Baltimore Gas and Electric Company [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable, Purchase	792	687
Pepco Holdings LLC [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable, Purchase	1,143	1,081
Potomac Electric Power Company [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable, Purchase	723	660
Delmarva Power & Light Company [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable, Purchase	205	217
Atlantic City Electric Company [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable, Purchase	215	204
Exelon Generation Co LLC Affiliate [Member] \| Commonwealth Edison Co [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable, Related Parties, Purchase		1
Exelon Generation Co LLC Affiliate [Member] \| PECO Energy Co [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable, Related Parties, Purchase		1
Exelon Generation Co LLC Affiliate [Member] \| Baltimore Gas and Electric Company [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable, Related Parties, Purchase	$ 4	$ 21

Property, Plant and Equipment -

Property, Plant and Equipment - Summary of Property, Plant and Equipment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 85,006	$ 78,988
Accumulated depreciation and amortization	15,930	14,430
Property, plant, and equipment, net	69,076	64,558
Electric—transmission and distribution
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 69,034	64,771
Electric—transmission and distribution \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Average Service Life (years)	5 years
Electric—transmission and distribution \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Average Service Life (years)	80 years
Gas Distribution Equipment
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 8,126	7,429
Gas Distribution Equipment \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Average Service Life (years)	5 years
Gas Distribution Equipment \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Average Service Life (years)	80 years
Common—electric and gas
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 2,521	2,335
Common—electric and gas \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Average Service Life (years)	4 years
Common—electric and gas \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Average Service Life (years)	75 years
Construction work in progress
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 4,534	3,698
Other Property Plant and Equipment
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 791	755
Other Property Plant and Equipment \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Average Service Life (years)	4 years
Other Property Plant and Equipment \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Average Service Life (years)	61 years
Commonwealth Edison Co [Member]
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 34,186	32,094
Accumulated depreciation and amortization	6,673	6,099
Property, plant, and equipment, net	27,513	25,995
Commonwealth Edison Co [Member] \| Electric—transmission and distribution
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 32,906	31,077
Commonwealth Edison Co [Member] \| Electric—transmission and distribution \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Average Service Life (years)	5 years
Commonwealth Edison Co [Member] \| Electric—transmission and distribution \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Average Service Life (years)	80 years
Commonwealth Edison Co [Member] \| Gas Distribution Equipment
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 0	0
Commonwealth Edison Co [Member] \| Common—electric and gas
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	0	0
Commonwealth Edison Co [Member] \| Construction work in progress
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	1,174	918
Commonwealth Edison Co [Member] \| Other Property Plant and Equipment
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 106	99
Commonwealth Edison Co [Member] \| Other Property Plant and Equipment \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Average Service Life (years)	31 years
Commonwealth Edison Co [Member] \| Other Property Plant and Equipment \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Average Service Life (years)	50 years
PECO Energy Co [Member]
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 16,203	15,081
Accumulated depreciation and amortization	4,078	3,964
Property, plant, and equipment, net	12,125	11,117
PECO Energy Co [Member] \| Electric—transmission and distribution
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 10,719	10,076
PECO Energy Co [Member] \| Electric—transmission and distribution \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Average Service Life (years)	5 years
PECO Energy Co [Member] \| Electric—transmission and distribution \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Average Service Life (years)	70 years
PECO Energy Co [Member] \| Gas Distribution Equipment
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 3,619	3,339
PECO Energy Co [Member] \| Gas Distribution Equipment \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Average Service Life (years)	5 years
PECO Energy Co [Member] \| Gas Distribution Equipment \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Average Service Life (years)	70 years
PECO Energy Co [Member] \| Common—electric and gas
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 1,071	1,005
PECO Energy Co [Member] \| Common—electric and gas \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Average Service Life (years)	5 years
PECO Energy Co [Member] \| Common—electric and gas \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Average Service Life (years)	55 years
PECO Energy Co [Member] \| Construction work in progress
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 744	620
PECO Energy Co [Member] \| Other Property Plant and Equipment
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 50	41
Average Service Life (years)	50 years
Baltimore Gas and Electric Company [Member]
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 15,921	14,876
Accumulated depreciation and amortization	4,583	4,299
Property, plant, and equipment, net	11,338	10,577
Baltimore Gas and Electric Company [Member] \| Electric—transmission and distribution
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 9,993	9,352
Baltimore Gas and Electric Company [Member] \| Electric—transmission and distribution \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Average Service Life (years)	5 years
Baltimore Gas and Electric Company [Member] \| Electric—transmission and distribution \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Average Service Life (years)	80 years
Baltimore Gas and Electric Company [Member] \| Gas Distribution Equipment
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 4,074	3,712
Baltimore Gas and Electric Company [Member] \| Gas Distribution Equipment \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Average Service Life (years)	5 years
Baltimore Gas and Electric Company [Member] \| Gas Distribution Equipment \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Average Service Life (years)	80 years
Baltimore Gas and Electric Company [Member] \| Common—electric and gas
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 1,317	1,224
Baltimore Gas and Electric Company [Member] \| Common—electric and gas \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Average Service Life (years)	4 years
Baltimore Gas and Electric Company [Member] \| Common—electric and gas \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Average Service Life (years)	50 years
Baltimore Gas and Electric Company [Member] \| Construction work in progress
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 487	554
Baltimore Gas and Electric Company [Member] \| Other Property Plant and Equipment
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 50	34
Baltimore Gas and Electric Company [Member] \| Other Property Plant and Equipment \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Average Service Life (years)	20 years
Baltimore Gas and Electric Company [Member] \| Other Property Plant and Equipment \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Average Service Life (years)	50 years
Pepco Holdings LLC [Member]
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 20,304	18,606
Accumulated depreciation and amortization	2,618	2,108
Property, plant, and equipment, net	17,686	16,498
Pepco Holdings LLC [Member] \| Electric—transmission and distribution
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 17,165	16,062
Pepco Holdings LLC [Member] \| Electric—transmission and distribution \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Average Service Life (years)	5 years
Pepco Holdings LLC [Member] \| Electric—transmission and distribution \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Average Service Life (years)	75 years
Pepco Holdings LLC [Member] \| Gas Distribution Equipment
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 696	646
Pepco Holdings LLC [Member] \| Gas Distribution Equipment \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Average Service Life (years)	5 years
Pepco Holdings LLC [Member] \| Gas Distribution Equipment \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Average Service Life (years)	75 years
Pepco Holdings LLC [Member] \| Common—electric and gas
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 228	201
Pepco Holdings LLC [Member] \| Common—electric and gas \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Average Service Life (years)	5 years
Pepco Holdings LLC [Member] \| Common—electric and gas \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Average Service Life (years)	75 years
Pepco Holdings LLC [Member] \| Construction work in progress
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 2,101	1,590
Pepco Holdings LLC [Member] \| Other Property Plant and Equipment
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 114	107
Pepco Holdings LLC [Member] \| Other Property Plant and Equipment \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Average Service Life (years)	10 years
Pepco Holdings LLC [Member] \| Other Property Plant and Equipment \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Average Service Life (years)	43 years
Potomac Electric Power Company [Member]
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 12,861	11,979
Accumulated depreciation and amortization	4,067	3,875
Property, plant, and equipment, net	8,794	8,104
Potomac Electric Power Company [Member] \| Electric—transmission and distribution
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 11,270	10,798
Potomac Electric Power Company [Member] \| Electric—transmission and distribution \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Average Service Life (years)	5 years
Potomac Electric Power Company [Member] \| Electric—transmission and distribution \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Average Service Life (years)	75 years
Potomac Electric Power Company [Member] \| Gas Distribution Equipment
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 0	0
Potomac Electric Power Company [Member] \| Common—electric and gas
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	0	0
Potomac Electric Power Company [Member] \| Construction work in progress
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	1,526	1,118
Potomac Electric Power Company [Member] \| Other Property Plant and Equipment
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 65	63
Potomac Electric Power Company [Member] \| Other Property Plant and Equipment \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Average Service Life (years)	10 years
Potomac Electric Power Company [Member] \| Other Property Plant and Equipment \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Average Service Life (years)	33 years
Delmarva Power & Light Company [Member]
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 6,592	6,195
Accumulated depreciation and amortization	1,772	1,635
Property, plant, and equipment, net	4,820	4,560
Delmarva Power & Light Company [Member] \| Electric—transmission and distribution
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 5,231	4,957
Delmarva Power & Light Company [Member] \| Electric—transmission and distribution \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Average Service Life (years)	5 years
Delmarva Power & Light Company [Member] \| Electric—transmission and distribution \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Average Service Life (years)	75 years
Delmarva Power & Light Company [Member] \| Gas Distribution Equipment
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 855	806
Delmarva Power & Light Company [Member] \| Gas Distribution Equipment \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Average Service Life (years)	5 years
Delmarva Power & Light Company [Member] \| Gas Distribution Equipment \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Average Service Life (years)	75 years
Delmarva Power & Light Company [Member] \| Common—electric and gas
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 206	180
Delmarva Power & Light Company [Member] \| Common—electric and gas \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Average Service Life (years)	5 years
Delmarva Power & Light Company [Member] \| Common—electric and gas \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Average Service Life (years)	75 years
Delmarva Power & Light Company [Member] \| Construction work in progress
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 271	229
Delmarva Power & Light Company [Member] \| Other Property Plant and Equipment
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 29	23
Delmarva Power & Light Company [Member] \| Other Property Plant and Equipment \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Average Service Life (years)	10 years
Delmarva Power & Light Company [Member] \| Other Property Plant and Equipment \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Average Service Life (years)	43 years
Atlantic City Electric Company [Member]
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 5,541	5,149
Accumulated depreciation and amortization	1,551	1,420
Property, plant, and equipment, net	3,990	3,729
Atlantic City Electric Company [Member] \| Electric—transmission and distribution
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 5,219	4,882
Atlantic City Electric Company [Member] \| Electric—transmission and distribution \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Average Service Life (years)	5 years
Atlantic City Electric Company [Member] \| Electric—transmission and distribution \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Average Service Life (years)	75 years
Atlantic City Electric Company [Member] \| Gas Distribution Equipment
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 0	0
Atlantic City Electric Company [Member] \| Common—electric and gas
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	0	0
Atlantic City Electric Company [Member] \| Construction work in progress
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	296	242
Atlantic City Electric Company [Member] \| Other Property Plant and Equipment
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 26	$ 25
Atlantic City Electric Company [Member] \| Other Property Plant and Equipment \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Average Service Life (years)	13 years
Atlantic City Electric Company [Member] \| Other Property Plant and Equipment \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Average Service Life (years)	15 years

Property, Plant and Equipment_3

Property, Plant and Equipment - Annual Depreciation Provisions as Percentage of Average Service Life (Details)	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Electric—transmission and distribution
Property, Plant and Equipment [Line Items]
Annual depreciation rate	2.87%	2.81%	2.79%
Gas Distribution Equipment
Property, Plant and Equipment [Line Items]
Annual depreciation rate	2.14%	2.13%	2.14%
Common—electric and gas
Property, Plant and Equipment [Line Items]
Annual depreciation rate	7.54%	7.31%	7.01%
Commonwealth Edison Co [Member] \| Electric—transmission and distribution
Property, Plant and Equipment [Line Items]
Annual depreciation rate	3%	2.94%	2.95%
PECO Energy Co [Member] \| Electric—transmission and distribution
Property, Plant and Equipment [Line Items]
Annual depreciation rate	2.29%	2.28%	2.31%
PECO Energy Co [Member] \| Gas Distribution Equipment
Property, Plant and Equipment [Line Items]
Annual depreciation rate	1.87%	1.84%	1.85%
PECO Energy Co [Member] \| Common—electric and gas
Property, Plant and Equipment [Line Items]
Annual depreciation rate	6.31%	6.34%	6.39%
Baltimore Gas and Electric Company [Member] \| Electric—transmission and distribution
Property, Plant and Equipment [Line Items]
Annual depreciation rate	2.82%	2.80%	2.69%
Baltimore Gas and Electric Company [Member] \| Gas Distribution Equipment
Property, Plant and Equipment [Line Items]
Annual depreciation rate	2.53%	2.54%	2.56%
Baltimore Gas and Electric Company [Member] \| Common—electric and gas
Property, Plant and Equipment [Line Items]
Annual depreciation rate	8.20%	7.88%	7.45%
Pepco Holdings LLC [Member] \| Electric—transmission and distribution
Property, Plant and Equipment [Line Items]
Annual depreciation rate	2.96%	2.87%	2.81%
Pepco Holdings LLC [Member] \| Gas Distribution Equipment
Property, Plant and Equipment [Line Items]
Annual depreciation rate	1.45%	1.47%	1.50%
Pepco Holdings LLC [Member] \| Common—electric and gas
Property, Plant and Equipment [Line Items]
Annual depreciation rate	8.96%	8.33%	7.36%
Potomac Electric Power Company [Member] \| Electric—transmission and distribution
Property, Plant and Equipment [Line Items]
Annual depreciation rate	2.58%	2.56%	2.53%
Delmarva Power & Light Company [Member] \| Electric—transmission and distribution
Property, Plant and Equipment [Line Items]
Annual depreciation rate	3.08%	2.86%	2.85%
Delmarva Power & Light Company [Member] \| Gas Distribution Equipment
Property, Plant and Equipment [Line Items]
Annual depreciation rate	1.45%	1.47%	1.50%
Delmarva Power & Light Company [Member] \| Common—electric and gas
Property, Plant and Equipment [Line Items]
Annual depreciation rate	10.03%	8.69%	6.72%
Atlantic City Electric Company [Member] \| Electric—transmission and distribution
Property, Plant and Equipment [Line Items]
Annual depreciation rate	3.38%	3.21%	3.08%

Property, Plant and Equipment_4

Property, Plant and Equipment - Summary of Capitalized Interest and AFUDC (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Capitalized Interest And AFUDC [Line Items]
Allowance for Funds Used During Construction, Capitalized Interest	$ 215	$ 189	$ 150
Commonwealth Edison Co [Member]
Capitalized Interest And AFUDC [Line Items]
Allowance for Funds Used During Construction, Capitalized Interest	54	47	42
PECO Energy Co [Member]
Capitalized Interest And AFUDC [Line Items]
Allowance for Funds Used During Construction, Capitalized Interest	42	34	23
Baltimore Gas and Electric Company [Member]
Capitalized Interest And AFUDC [Line Items]
Allowance for Funds Used During Construction, Capitalized Interest	29	36	30
Pepco Holdings LLC [Member]
Capitalized Interest And AFUDC [Line Items]
Allowance for Funds Used During Construction, Capitalized Interest	90	72	55
Potomac Electric Power Company [Member]
Capitalized Interest And AFUDC [Line Items]
Allowance for Funds Used During Construction, Capitalized Interest	69	59	42
Delmarva Power & Light Company [Member]
Capitalized Interest And AFUDC [Line Items]
Allowance for Funds Used During Construction, Capitalized Interest	10	8	6
Atlantic City Electric Company [Member]
Capitalized Interest And AFUDC [Line Items]
Allowance for Funds Used During Construction, Capitalized Interest	$ 11	$ 5	$ 7

Jointly Owned Electric Utilit_3

Jointly Owned Electric Utility Plant - Ownership Interests in Jointly Owned Electric Plants and Transmission Facilities (Details) $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($) V mi	Dec. 31, 2021 USD ($)
Delaware And New Jersey [Member]
Schedule Of Jointly Owned Utility Plant Net Ownership [Abstract]
Miles of transmission voltage lines \| mi	151.3
Transmission line capacity	500
Delaware River Crossing [Member]
Schedule Of Jointly Owned Utility Plant Net Ownership [Abstract]
Miles of transmission voltage lines \| mi	2.5
Transmission line capacity	500
New Freedom Switching [Member]
Schedule Of Jointly Owned Utility Plant Net Ownership [Abstract]
Transmission line capacity	500
Electric Transmission [Member] \| Delaware And New Jersey [Member]
Schedule Of Jointly Owned Utility Plant Net Ownership [Abstract]
Plant \| $	$ 103	$ 103
Accumulated depreciation \| $	$ 56	$ 55
PECO Energy Co [Member] \| Delaware And New Jersey [Member]
Schedule Of Jointly Owned Utility Plant Net Ownership [Abstract]
Ownership interest	42.55%
PECO Energy Co [Member] \| Delaware River Crossing [Member]
Schedule Of Jointly Owned Utility Plant Net Ownership [Abstract]
Ownership interest	42.55%
Delmarva Power & Light Company [Member] \| Delaware And New Jersey [Member]
Schedule Of Jointly Owned Utility Plant Net Ownership [Abstract]
Ownership interest	1%
Delmarva Power & Light Company [Member] \| Delaware River Crossing [Member]
Schedule Of Jointly Owned Utility Plant Net Ownership [Abstract]
Ownership interest	7.45%
Atlantic City Electric Company [Member] \| Delaware And New Jersey [Member]
Schedule Of Jointly Owned Utility Plant Net Ownership [Abstract]
Ownership interest	13.90%
Atlantic City Electric Company [Member] \| Delaware River Crossing [Member]
Schedule Of Jointly Owned Utility Plant Net Ownership [Abstract]
Ownership interest	7.45%
Atlantic City Electric Company [Member] \| New Freedom Switching [Member]
Schedule Of Jointly Owned Utility Plant Net Ownership [Abstract]
Ownership interest	21.78%

Asset Retirement Obligations -

Asset Retirement Obligations - Nuclear Decommissioning Asset Retirement Obligation Rollforward (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Accretion expense	$ (44)	$ (514)	$ (500)

Asset Retirement Obligations _2

Asset Retirement Obligations - Non-Nuclear Asset Retirement Obligations Rollforward (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Accretion expense	$ 44	$ 514	$ 500
Commonwealth Edison Co [Member]
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Accretion expense	0	0	0
PECO Energy Co [Member]
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Accretion expense	0	0	0
Baltimore Gas and Electric Company [Member]
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Accretion expense	0	0	0
Pepco Holdings LLC [Member]
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Accretion expense	0	0	0
Potomac Electric Power Company [Member]
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Accretion expense	0	0	0
Delmarva Power & Light Company [Member]
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Accretion expense	0	0	0
Atlantic City Electric Company [Member]
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Accretion expense	0	0	0
Nonnuclear Decommissioning Asset Retirement Obligation [Member]
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
ARO beginning balance	274	249
Asset Retirement Obligation, Revision of Estimate	(8)	26
Accretion expense	8	7
Payments	(3)	(8)
ARO ending balance	271	274	249
Nonnuclear Decommissioning Asset Retirement Obligation [Member] \| Commonwealth Edison Co [Member]
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
ARO beginning balance	146	129
Asset Retirement Obligation, Revision of Estimate	2	15
Accretion expense	4	4
Payments	(2)	(2)
ARO ending balance	150	146	129
Nonnuclear Decommissioning Asset Retirement Obligation [Member] \| PECO Energy Co [Member]
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
ARO beginning balance	29	29
Asset Retirement Obligation, Revision of Estimate	(1)	0
Accretion expense	1	1
Payments	(1)	(1)
ARO ending balance	28	29	29
Nonnuclear Decommissioning Asset Retirement Obligation [Member] \| Baltimore Gas and Electric Company [Member]
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
ARO beginning balance	26	23
Asset Retirement Obligation, Revision of Estimate	3	2
Accretion expense	1	1
Payments	0	0
ARO ending balance	30	26	23
Nonnuclear Decommissioning Asset Retirement Obligation [Member] \| Pepco Holdings LLC [Member]
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
ARO beginning balance	70	59
Asset Retirement Obligation, Revision of Estimate	(13)	10
Accretion expense	2	1
Payments	0	0
ARO ending balance	59	70	59
Nonnuclear Decommissioning Asset Retirement Obligation [Member] \| Potomac Electric Power Company [Member]
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
ARO beginning balance	45	39
Asset Retirement Obligation, Revision of Estimate	(8)	5
Accretion expense	2	1
Payments	0	0
ARO ending balance	39	45	39
Nonnuclear Decommissioning Asset Retirement Obligation [Member] \| Delmarva Power & Light Company [Member]
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
ARO beginning balance	16	14
Asset Retirement Obligation, Revision of Estimate	(3)	2
Accretion expense	0	0
Payments	0	0
ARO ending balance	13	16	14
Nonnuclear Decommissioning Asset Retirement Obligation [Member] \| Atlantic City Electric Company [Member]
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
ARO beginning balance	9	6
Asset Retirement Obligation, Revision of Estimate	(2)	3
Accretion expense	0	0
Payments	0	0
ARO ending balance	$ 7	$ 9	$ 6

Lessee - Narrative (Details)

Lessee - Narrative (Details)	12 Months Ended
Lessee - Narrative (Details)	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Lessee, Lease, Description [Line Items]
Operating Lease, Weighted Average Remaining Lease Term	9 years 6 months	8 years 10 months 24 days	9 years
Operating Lease, Weighted Average Discount Rate, Percent	3.90%	4%	4%
Real Estate [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Description	●
Vehicles [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Description	●
Minimum [Member]
Lessee, Lease, Description [Line Items]
Remaining lease terms, Lessee, Operating Lease	1 year
Options to extend the term, Lessee, Operating Lease	3 years
Option to terminate within, Lessee, Operating Lease	1 years
Maximum [Member]
Lessee, Lease, Description [Line Items]
Remaining lease terms, Lessee, Operating Lease	83 years
Options to extend the term, Lessee, Operating Lease	30 years
Option to terminate within, Lessee, Operating Lease	10 years
Commonwealth Edison Co [Member]
Lessee, Lease, Description [Line Items]
Operating Lease, Weighted Average Remaining Lease Term	1 year	3 years 3 months 18 days	3 years 9 months 18 days
Operating Lease, Weighted Average Discount Rate, Percent	2.60%	2.80%	3%
Commonwealth Edison Co [Member] \| Real Estate [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Description	●
Commonwealth Edison Co [Member] \| Vehicles [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Description	●
Commonwealth Edison Co [Member] \| Minimum [Member]
Lessee, Lease, Description [Line Items]
Remaining lease terms, Lessee, Operating Lease	1 year
Options to extend the term, Lessee, Operating Lease	N/A years
Option to terminate within, Lessee, Operating Lease	1 years
Commonwealth Edison Co [Member] \| Maximum [Member]
Lessee, Lease, Description [Line Items]
Remaining lease terms, Lessee, Operating Lease	3 years
Options to extend the term, Lessee, Operating Lease	N/A years
Option to terminate within, Lessee, Operating Lease	1 years
PECO Energy Co [Member]
Lessee, Lease, Description [Line Items]
Operating Lease, Weighted Average Remaining Lease Term	5 years 6 months	6 years 1 month 6 days	4 years 2 months 12 days
Operating Lease, Weighted Average Discount Rate, Percent	2.30%	2.20%	2.90%
PECO Energy Co [Member] \| Real Estate [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Description	●
PECO Energy Co [Member] \| Vehicles [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Description	●
PECO Energy Co [Member] \| Minimum [Member]
Lessee, Lease, Description [Line Items]
Remaining lease terms, Lessee, Operating Lease	1 year
PECO Energy Co [Member] \| Maximum [Member]
Lessee, Lease, Description [Line Items]
Remaining lease terms, Lessee, Operating Lease	11 years
Baltimore Gas and Electric Company [Member]
Lessee, Lease, Description [Line Items]
Operating Lease, Weighted Average Remaining Lease Term	70 years 10 months 24 days	13 years 8 months 12 days	8 years 3 months 18 days
Operating Lease, Weighted Average Discount Rate, Percent	4.50%	4%	3.80%
Baltimore Gas and Electric Company [Member] \| Real Estate [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Description	●
Baltimore Gas and Electric Company [Member] \| Vehicles [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Description	●
Baltimore Gas and Electric Company [Member] \| Minimum [Member]
Lessee, Lease, Description [Line Items]
Remaining lease terms, Lessee, Operating Lease	1 year
Option to terminate within, Lessee, Operating Lease	N/A years
Baltimore Gas and Electric Company [Member] \| Maximum [Member]
Lessee, Lease, Description [Line Items]
Remaining lease terms, Lessee, Operating Lease	83 years
Option to terminate within, Lessee, Operating Lease	N/A years
Pepco Holdings LLC [Member]
Lessee, Lease, Description [Line Items]
Operating Lease, Weighted Average Remaining Lease Term	6 years 9 months 18 days	7 years 6 months	8 years 2 months 12 days
Finance Lease, Weighted Average Remaining Lease Term	5 years 6 months	6 years 1 month 6 days	6 years 6 months
Operating Lease, Weighted Average Discount Rate, Percent	4.20%	4.20%	4.20%
Finance Lease, Weighted Average Discount Rate, Percent	2.30%	2.20%	2.50%
Pepco Holdings LLC [Member] \| Real Estate [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Description	●
Pepco Holdings LLC [Member] \| Vehicles [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Description	●
Pepco Holdings LLC [Member] \| Minimum [Member]
Lessee, Lease, Description [Line Items]
Remaining lease terms, Lessee, Operating Lease	1 year
Options to extend the term, Lessee, Operating Lease	3 years
Pepco Holdings LLC [Member] \| Maximum [Member]
Lessee, Lease, Description [Line Items]
Remaining lease terms, Lessee, Operating Lease	9 years
Options to extend the term, Lessee, Operating Lease	30 years
Potomac Electric Power Company [Member]
Lessee, Lease, Description [Line Items]
Operating Lease, Weighted Average Remaining Lease Term	8 years 1 month 6 days	8 years 7 months 6 days	9 years 1 month 6 days
Finance Lease, Weighted Average Remaining Lease Term	5 years 4 months 24 days	5 years 10 months 24 days	6 years 3 months 18 days
Operating Lease, Weighted Average Discount Rate, Percent	4%	4%	4%
Finance Lease, Weighted Average Discount Rate, Percent	2.30%	2.30%	2.60%
Potomac Electric Power Company [Member] \| Real Estate [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Description	●
Potomac Electric Power Company [Member] \| Vehicles [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Description	●
Potomac Electric Power Company [Member] \| Minimum [Member]
Lessee, Lease, Description [Line Items]
Remaining lease terms, Lessee, Operating Lease	1 year
Options to extend the term, Lessee, Operating Lease	5 years
Potomac Electric Power Company [Member] \| Maximum [Member]
Lessee, Lease, Description [Line Items]
Remaining lease terms, Lessee, Operating Lease	9 years
Options to extend the term, Lessee, Operating Lease	5 years
Delmarva Power & Light Company [Member]
Lessee, Lease, Description [Line Items]
Operating Lease, Weighted Average Remaining Lease Term	7 years 10 months 24 days	8 years 6 months	9 years 1 month 6 days
Finance Lease, Weighted Average Remaining Lease Term	5 years 6 months	6 years 1 month 6 days	6 years 6 months
Operating Lease, Weighted Average Discount Rate, Percent	4%	4%	4%
Finance Lease, Weighted Average Discount Rate, Percent	2.30%	2.10%	2.40%
Delmarva Power & Light Company [Member] \| Real Estate [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Description	●
Delmarva Power & Light Company [Member] \| Vehicles [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Description	●
Delmarva Power & Light Company [Member] \| Minimum [Member]
Lessee, Lease, Description [Line Items]
Remaining lease terms, Lessee, Operating Lease	1 year
Options to extend the term, Lessee, Operating Lease	3 years
Delmarva Power & Light Company [Member] \| Maximum [Member]
Lessee, Lease, Description [Line Items]
Remaining lease terms, Lessee, Operating Lease	9 years
Options to extend the term, Lessee, Operating Lease	30 years
Atlantic City Electric Company [Member]
Lessee, Lease, Description [Line Items]
Operating Lease, Weighted Average Remaining Lease Term	3 years 3 months 18 days	3 years 6 months	4 years
Finance Lease, Weighted Average Remaining Lease Term	5 years 7 months 6 days	6 years 3 months 18 days	6 years 6 months
Operating Lease, Weighted Average Discount Rate, Percent	3.30%	3.40%	3.50%
Finance Lease, Weighted Average Discount Rate, Percent	2.40%	2.10%	2.40%
Atlantic City Electric Company [Member] \| Real Estate [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Description	●
Atlantic City Electric Company [Member] \| Vehicles [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Description	●
Atlantic City Electric Company [Member] \| Minimum [Member]
Lessee, Lease, Description [Line Items]
Remaining lease terms, Lessee, Operating Lease	1 year
Options to extend the term, Lessee, Operating Lease	5 years
Atlantic City Electric Company [Member] \| Maximum [Member]
Lessee, Lease, Description [Line Items]
Remaining lease terms, Lessee, Operating Lease	7 years
Options to extend the term, Lessee, Operating Lease	5 years

Lessee - Components of Lease Co

Lessee - Components of Lease Cost (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Schedule of Components of Lease Cost [Line Items]
Operating Lease, Cost	$ 66	$ 84	$ 98
Variable Lease, Cost	8	7	7
Total Lease Cost	74	91	105
Sublease Income	4	4	4
Commonwealth Edison Co [Member]
Schedule of Components of Lease Cost [Line Items]
Operating Lease, Cost	2	3	3
Variable Lease, Cost	1	1	1
Total Lease Cost	3	4	4
PECO Energy Co [Member]
Schedule of Components of Lease Cost [Line Items]
Operating Lease, Cost	0	0	1
Variable Lease, Cost	0	0	0
Total Lease Cost	0	0	1
Baltimore Gas and Electric Company [Member]
Schedule of Components of Lease Cost [Line Items]
Operating Lease, Cost	15	30	33
Variable Lease, Cost	0	1	1
Total Lease Cost	15	31	34
Pepco Holdings LLC [Member]
Schedule of Components of Lease Cost [Line Items]
Operating Lease, Cost	42	43	46
Variable Lease, Cost	2	1	2
Total Lease Cost	44	44	48
Finance Lease, Right-of-Use Asset, Amortization	14	11	7
Finance Lease, Interest Expense	4	2	2
Finance Lease, Cost	18	13	9
Potomac Electric Power Company [Member]
Schedule of Components of Lease Cost [Line Items]
Operating Lease, Cost	10	10	11
Variable Lease, Cost	1	0	1
Total Lease Cost	11	10	12
Finance Lease, Right-of-Use Asset, Amortization	5	4	3
Finance Lease, Interest Expense	1	1	0
Finance Lease, Cost	6	5	3
Delmarva Power & Light Company [Member]
Schedule of Components of Lease Cost [Line Items]
Operating Lease, Cost	12	12	13
Variable Lease, Cost	1	0	1
Total Lease Cost	13	12	14
Finance Lease, Right-of-Use Asset, Amortization	6	4	3
Finance Lease, Interest Expense	2	1	1
Finance Lease, Cost	8	5	4
Atlantic City Electric Company [Member]
Schedule of Components of Lease Cost [Line Items]
Operating Lease, Cost	6	6	6
Variable Lease, Cost	1	0	0
Total Lease Cost	7	6	6
Finance Lease, Right-of-Use Asset, Amortization	3	3	2
Finance Lease, Interest Expense	1	0	0
Finance Lease, Cost	$ 4	$ 3	$ 2

Lessee - Supplemental Balance S

Lessee - Supplemental Balance Sheet Information (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Supplemental Balance Sheet Information [Line Items]
Other current liabilities	$ 1,155	$ 766
Other deferred credits and other liabilities	1,967	1,573
Operating Lease, Liability	306	315
Other Noncurrent Assets [Member]
Supplemental Balance Sheet Information [Line Items]
Operating Lease, Right-of-Use Asset	265	271
Other Current Liabilities [Member]
Supplemental Balance Sheet Information [Line Items]
Other current liabilities	40	52
Other deferred credits and other liabilities [Member]
Supplemental Balance Sheet Information [Line Items]
Other deferred credits and other liabilities	266	263
Commonwealth Edison Co [Member]
Supplemental Balance Sheet Information [Line Items]
Other current liabilities	191	133
Other deferred credits and other liabilities	642	592
Operating Lease, Liability	2	5
Commonwealth Edison Co [Member] \| Other Noncurrent Assets [Member]
Supplemental Balance Sheet Information [Line Items]
Operating Lease, Right-of-Use Asset	2	5
Commonwealth Edison Co [Member] \| Other Current Liabilities [Member]
Supplemental Balance Sheet Information [Line Items]
Other current liabilities	2	2
Commonwealth Edison Co [Member] \| Other deferred credits and other liabilities [Member]
Supplemental Balance Sheet Information [Line Items]
Other deferred credits and other liabilities	0	3
PECO Energy Co [Member]
Supplemental Balance Sheet Information [Line Items]
Other current liabilities	32	35
Other deferred credits and other liabilities	85	83
Operating Lease, Liability	1	1
PECO Energy Co [Member] \| Other Noncurrent Assets [Member]
Supplemental Balance Sheet Information [Line Items]
Operating Lease, Right-of-Use Asset	1	1
PECO Energy Co [Member] \| Other Current Liabilities [Member]
Supplemental Balance Sheet Information [Line Items]
Other current liabilities	0	0
PECO Energy Co [Member] \| Other deferred credits and other liabilities [Member]
Supplemental Balance Sheet Information [Line Items]
Other deferred credits and other liabilities	1	1
Baltimore Gas and Electric Company [Member]
Supplemental Balance Sheet Information [Line Items]
Other current liabilities	55	48
Other deferred credits and other liabilities	88	98
Operating Lease, Liability	4	19
Baltimore Gas and Electric Company [Member] \| Other Noncurrent Assets [Member]
Supplemental Balance Sheet Information [Line Items]
Operating Lease, Right-of-Use Asset	2	16
Baltimore Gas and Electric Company [Member] \| Other Current Liabilities [Member]
Supplemental Balance Sheet Information [Line Items]
Other current liabilities	0	15
Baltimore Gas and Electric Company [Member] \| Other deferred credits and other liabilities [Member]
Supplemental Balance Sheet Information [Line Items]
Other deferred credits and other liabilities	4	4
Pepco Holdings LLC [Member]
Supplemental Balance Sheet Information [Line Items]
Other current liabilities	330	171
Other deferred credits and other liabilities	536	570
Operating Lease, Liability	198	226
Finance Lease, Liability, Current	12	10
Finance Lease, Liability, Noncurrent	64	64
Finance lease, liability	76	74
Pepco Holdings LLC [Member] \| Other Noncurrent Assets [Member]
Supplemental Balance Sheet Information [Line Items]
Operating Lease, Right-of-Use Asset	180	209
Pepco Holdings LLC [Member] \| Other Current Liabilities [Member]
Supplemental Balance Sheet Information [Line Items]
Other current liabilities	31	31
Pepco Holdings LLC [Member] \| Other deferred credits and other liabilities [Member]
Supplemental Balance Sheet Information [Line Items]
Other deferred credits and other liabilities	167	195
Pepco Holdings LLC [Member] \| Property, Plant and Equipment
Supplemental Balance Sheet Information [Line Items]
Finance Lease, Right-of-Use Asset, after Accumulated Amortization	74	73
Potomac Electric Power Company [Member]
Supplemental Balance Sheet Information [Line Items]
Other current liabilities	93	55
Other deferred credits and other liabilities	244	314
Operating Lease, Liability	40	46
Finance Lease, Liability, Current	4	3
Finance Lease, Liability, Noncurrent	21	23
Finance lease, liability	25	26
Potomac Electric Power Company [Member] \| Other Noncurrent Assets [Member]
Supplemental Balance Sheet Information [Line Items]
Operating Lease, Right-of-Use Asset	36	43
Potomac Electric Power Company [Member] \| Other Current Liabilities [Member]
Supplemental Balance Sheet Information [Line Items]
Other current liabilities	6	6
Potomac Electric Power Company [Member] \| Other deferred credits and other liabilities [Member]
Supplemental Balance Sheet Information [Line Items]
Other deferred credits and other liabilities	34	40
Potomac Electric Power Company [Member] \| Property, Plant and Equipment
Supplemental Balance Sheet Information [Line Items]
Finance Lease, Right-of-Use Asset, after Accumulated Amortization	25	25
Delmarva Power & Light Company [Member]
Supplemental Balance Sheet Information [Line Items]
Other current liabilities	136	59
Other deferred credits and other liabilities	84	89
Operating Lease, Liability	50	57
Finance Lease, Liability, Current	5	4
Finance Lease, Liability, Noncurrent	27	25
Finance lease, liability	32	29
Delmarva Power & Light Company [Member] \| Other Noncurrent Assets [Member]
Supplemental Balance Sheet Information [Line Items]
Operating Lease, Right-of-Use Asset	39	46
Delmarva Power & Light Company [Member] \| Other Current Liabilities [Member]
Supplemental Balance Sheet Information [Line Items]
Other current liabilities	8	8
Delmarva Power & Light Company [Member] \| Other deferred credits and other liabilities [Member]
Supplemental Balance Sheet Information [Line Items]
Other deferred credits and other liabilities	42	49
Delmarva Power & Light Company [Member] \| Property, Plant and Equipment
Supplemental Balance Sheet Information [Line Items]
Finance Lease, Right-of-Use Asset, after Accumulated Amortization	31	29
Atlantic City Electric Company [Member]
Supplemental Balance Sheet Information [Line Items]
Other current liabilities	58	12
Other deferred credits and other liabilities	100	49
Operating Lease, Liability	10	12
Finance Lease, Liability, Current	3	3
Finance Lease, Liability, Noncurrent	16	16
Finance lease, liability	19	19
Atlantic City Electric Company [Member] \| Other Noncurrent Assets [Member]
Supplemental Balance Sheet Information [Line Items]
Operating Lease, Right-of-Use Asset	9	11
Atlantic City Electric Company [Member] \| Other Current Liabilities [Member]
Supplemental Balance Sheet Information [Line Items]
Other current liabilities	3	3
Atlantic City Electric Company [Member] \| Other deferred credits and other liabilities [Member]
Supplemental Balance Sheet Information [Line Items]
Other deferred credits and other liabilities	7	9
Atlantic City Electric Company [Member] \| Property, Plant and Equipment
Supplemental Balance Sheet Information [Line Items]
Finance Lease, Right-of-Use Asset, after Accumulated Amortization	$ 18	$ 19

Lessee - Lessee Future Minimum

Lessee - Lessee Future Minimum Operating Lease Maturity Payments (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Schedule of Lessee, Operating Lease, Liability, Maturity [Line Items]
2023	$ 52
2024	45
2025	43
2026	39
2027	39
Remaining years	161
Lessee, Operating Lease, Liability, to be Paid	379
Interest	73
Operating Lease, Liability	306	$ 315
Total property, plant and equipment	85,006	78,988
Construction work in progress
Schedule of Lessee, Operating Lease, Liability, Maturity [Line Items]
Total property, plant and equipment	4,534	3,698
Commonwealth Edison Co [Member]
Schedule of Lessee, Operating Lease, Liability, Maturity [Line Items]
2023	2
2024	0
2025	0
2026	0
2027	0
Remaining years	0
Lessee, Operating Lease, Liability, to be Paid	2
Interest	0
Operating Lease, Liability	2	5
Total property, plant and equipment	34,186	32,094
Commonwealth Edison Co [Member] \| Construction work in progress
Schedule of Lessee, Operating Lease, Liability, Maturity [Line Items]
Total property, plant and equipment	1,174	918
PECO Energy Co [Member]
Schedule of Lessee, Operating Lease, Liability, Maturity [Line Items]
2023	0
2024	0
2025	0
2026	0
2027	0
Remaining years	1
Lessee, Operating Lease, Liability, to be Paid	1
Interest	0
Operating Lease, Liability	1	1
Total property, plant and equipment	16,203	15,081
PECO Energy Co [Member] \| Construction work in progress
Schedule of Lessee, Operating Lease, Liability, Maturity [Line Items]
Total property, plant and equipment	744	620
Baltimore Gas and Electric Company [Member]
Schedule of Lessee, Operating Lease, Liability, Maturity [Line Items]
2023	1
2024	0
2025	0
2026	0
2027	0
Remaining years	18
Lessee, Operating Lease, Liability, to be Paid	19
Interest	15
Operating Lease, Liability	4	19
Total property, plant and equipment	15,921	14,876
Baltimore Gas and Electric Company [Member] \| Construction work in progress
Schedule of Lessee, Operating Lease, Liability, Maturity [Line Items]
Total property, plant and equipment	487	554
Pepco Holdings LLC [Member]
Schedule of Lessee, Operating Lease, Liability, Maturity [Line Items]
2023	37
2024	35
2025	34
2026	30
2027	29
Remaining years	67
Lessee, Operating Lease, Liability, to be Paid	232
Interest	34
Operating Lease, Liability	198	226
Total property, plant and equipment	20,304	18,606
Schedule of Lessee, Finance Lease, Liability, Maturity [Line Items]
2023	14
2024	14
2025	15
2026	15
2027	12
Remaining years	12
Finance Lease, Liability, to be Paid	82
Interest	6
Finance lease, liability	76	74
Pepco Holdings LLC [Member] \| Construction work in progress
Schedule of Lessee, Operating Lease, Liability, Maturity [Line Items]
Total property, plant and equipment	2,101	1,590
Potomac Electric Power Company [Member]
Schedule of Lessee, Operating Lease, Liability, Maturity [Line Items]
2023	7
2024	6
2025	6
2026	5
2027	4
Remaining years	20
Lessee, Operating Lease, Liability, to be Paid	48
Interest	8
Operating Lease, Liability	40	46
Total property, plant and equipment	12,861	11,979
Schedule of Lessee, Finance Lease, Liability, Maturity [Line Items]
2023	5
2024	5
2025	5
2026	5
2027	4
Remaining years	4
Finance Lease, Liability, to be Paid	28
Interest	3
Finance lease, liability	25	26
Potomac Electric Power Company [Member] \| Construction work in progress
Schedule of Lessee, Operating Lease, Liability, Maturity [Line Items]
Total property, plant and equipment	1,526	1,118
Delmarva Power & Light Company [Member]
Schedule of Lessee, Operating Lease, Liability, Maturity [Line Items]
2023	10
2024	9
2025	7
2026	5
2027	6
Remaining years	25
Lessee, Operating Lease, Liability, to be Paid	62
Interest	12
Operating Lease, Liability	50	57
Total property, plant and equipment	6,592	6,195
Schedule of Lessee, Finance Lease, Liability, Maturity [Line Items]
2023	6
2024	6
2025	6
2026	6
2027	5
Remaining years	5
Finance Lease, Liability, to be Paid	34
Interest	2
Finance lease, liability	32	29
Delmarva Power & Light Company [Member] \| Construction work in progress
Schedule of Lessee, Operating Lease, Liability, Maturity [Line Items]
Total property, plant and equipment	271	229
Atlantic City Electric Company [Member]
Schedule of Lessee, Operating Lease, Liability, Maturity [Line Items]
2023	4
2024	3
2025	2
2026	1
2027	1
Remaining years	0
Lessee, Operating Lease, Liability, to be Paid	11
Interest	1
Operating Lease, Liability	10	12
Total property, plant and equipment	5,541	5,149
Schedule of Lessee, Finance Lease, Liability, Maturity [Line Items]
2023	3
2024	3
2025	4
2026	4
2027	3
Remaining years	3
Finance Lease, Liability, to be Paid	20
Interest	1
Finance lease, liability	19	19
Atlantic City Electric Company [Member] \| Construction work in progress
Schedule of Lessee, Operating Lease, Liability, Maturity [Line Items]
Total property, plant and equipment	$ 296	$ 242

Lessee - Supplemental Cash Flow

Lessee - Supplemental Cash Flow Information Related to Leases (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Supplemental Cash Flow Information [Line Items]
Operating cash flows from operating leases	$ 66	$ 93	$ 67
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	46	1	(2)
Commonwealth Edison Co [Member]
Supplemental Cash Flow Information [Line Items]
Operating cash flows from operating leases	3	3	3
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	0	0	0
PECO Energy Co [Member]
Supplemental Cash Flow Information [Line Items]
Operating cash flows from operating leases	0	0	1
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	0	0	1
Baltimore Gas and Electric Company [Member]
Supplemental Cash Flow Information [Line Items]
Operating cash flows from operating leases	16	46	20
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	0	(1)	0
Pepco Holdings LLC [Member]
Supplemental Cash Flow Information [Line Items]
Operating cash flows from operating leases	37	39	39
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	2	1	(1)
Finance Lease, Principal Payments	13	10	6
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability	14	32	29
Potomac Electric Power Company [Member]
Supplemental Cash Flow Information [Line Items]
Operating cash flows from operating leases	8	8	8
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	0	0	0
Finance Lease, Principal Payments	5	3	2
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability	4	12	8
Delmarva Power & Light Company [Member]
Supplemental Cash Flow Information [Line Items]
Operating cash flows from operating leases	9	9	9
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	1	1	(1)
Finance Lease, Principal Payments	5	4	3
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability	7	12	14
Atlantic City Electric Company [Member]
Supplemental Cash Flow Information [Line Items]
Operating cash flows from operating leases	4	4	4
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	1	0	0
Finance Lease, Principal Payments	3	3	1
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability	$ 3	$ 8	$ 7

Lessor - Narrative (Details)

Lessor - Narrative (Details)	12 Months Ended
Lessor - Narrative (Details)	Dec. 31, 2022
Minimum [Member]
Lessor, Lease, Description [Line Items]
Remaining lease terms, Lessor, Operating Lease	1 year
Options to extend the term, Lessor, Operating Lease	5 years
Maximum [Member]
Lessor, Lease, Description [Line Items]
Remaining lease terms, Lessor, Operating Lease	80 years
Options to extend the term, Lessor, Operating Lease	79 years
Real Estate [Member]
Lessor, Lease, Description [Line Items]
Lessor, Operating Lease, Description	●
Commonwealth Edison Co [Member] \| Minimum [Member]
Lessor, Lease, Description [Line Items]
Remaining lease terms, Lessor, Operating Lease	1 year
Options to extend the term, Lessor, Operating Lease	5 years
Commonwealth Edison Co [Member] \| Maximum [Member]
Lessor, Lease, Description [Line Items]
Remaining lease terms, Lessor, Operating Lease	14 years
Options to extend the term, Lessor, Operating Lease	79 years
Commonwealth Edison Co [Member] \| Real Estate [Member]
Lessor, Lease, Description [Line Items]
Lessor, Operating Lease, Description	●
PECO Energy Co [Member] \| Minimum [Member]
Lessor, Lease, Description [Line Items]
Remaining lease terms, Lessor, Operating Lease	1 year
Options to extend the term, Lessor, Operating Lease	5 years
PECO Energy Co [Member] \| Maximum [Member]
Lessor, Lease, Description [Line Items]
Remaining lease terms, Lessor, Operating Lease	80 years
Options to extend the term, Lessor, Operating Lease	50 years
PECO Energy Co [Member] \| Real Estate [Member]
Lessor, Lease, Description [Line Items]
Lessor, Operating Lease, Description	●
Baltimore Gas and Electric Company [Member] \| Minimum [Member]
Lessor, Lease, Description [Line Items]
Remaining lease terms, Lessor, Operating Lease	20 years
Baltimore Gas and Electric Company [Member] \| Maximum [Member]
Lessor, Lease, Description [Line Items]
Remaining lease terms, Lessor, Operating Lease	20 years
Baltimore Gas and Electric Company [Member] \| Real Estate [Member]
Lessor, Lease, Description [Line Items]
Lessor, Operating Lease, Description	●
Pepco Holdings LLC [Member] \| Minimum [Member]
Lessor, Lease, Description [Line Items]
Remaining lease terms, Lessor, Operating Lease	1 year
Options to extend the term, Lessor, Operating Lease	N/A years
Pepco Holdings LLC [Member] \| Maximum [Member]
Lessor, Lease, Description [Line Items]
Remaining lease terms, Lessor, Operating Lease	10 years
Options to extend the term, Lessor, Operating Lease	N/A years
Pepco Holdings LLC [Member] \| Real Estate [Member]
Lessor, Lease, Description [Line Items]
Lessor, Operating Lease, Description	●
Potomac Electric Power Company [Member] \| Minimum [Member]
Lessor, Lease, Description [Line Items]
Remaining lease terms, Lessor, Operating Lease	1 year
Potomac Electric Power Company [Member] \| Maximum [Member]
Lessor, Lease, Description [Line Items]
Remaining lease terms, Lessor, Operating Lease	3 years
Potomac Electric Power Company [Member] \| Real Estate [Member]
Lessor, Lease, Description [Line Items]
Lessor, Operating Lease, Description	●
Delmarva Power & Light Company [Member] \| Minimum [Member]
Lessor, Lease, Description [Line Items]
Remaining lease terms, Lessor, Operating Lease	9 years
Delmarva Power & Light Company [Member] \| Maximum [Member]
Lessor, Lease, Description [Line Items]
Remaining lease terms, Lessor, Operating Lease	10 years
Delmarva Power & Light Company [Member] \| Real Estate [Member]
Lessor, Lease, Description [Line Items]
Lessor, Operating Lease, Description	●

Lessor - Components of Operatin

Lessor - Components of Operating Lease Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Schedule of Operating Lease, Lease Income [Line Items]
Operating Lease Income	$ 4	$ 5	$ 5
Variable Lease Income	1	1	1
Commonwealth Edison Co [Member]
Schedule of Operating Lease, Lease Income [Line Items]
Operating Lease Income	0	0	0
Variable Lease Income	0	0	0
PECO Energy Co [Member]
Schedule of Operating Lease, Lease Income [Line Items]
Operating Lease Income	0	0	0
Variable Lease Income	0	0	0
Baltimore Gas and Electric Company [Member]
Schedule of Operating Lease, Lease Income [Line Items]
Operating Lease Income	0	0	0
Variable Lease Income	0	0	0
Pepco Holdings LLC [Member]
Schedule of Operating Lease, Lease Income [Line Items]
Operating Lease Income	4	4	3
Variable Lease Income	1	1	1
Potomac Electric Power Company [Member]
Schedule of Operating Lease, Lease Income [Line Items]
Operating Lease Income	0	0	0
Variable Lease Income	0	0	0
Delmarva Power & Light Company [Member]
Schedule of Operating Lease, Lease Income [Line Items]
Operating Lease Income	3	3	3
Variable Lease Income	$ 1	$ 1	$ 1

Lessor - Operating Lease, Payme

Lessor - Operating Lease, Payments, Fiscal Year Maturity (Details) $ in Millions	Dec. 31, 2022 USD ($)
Schedule of Lessor, Operating Lease, Payments to be Received, Maturity [Line Items]
2023	$ 5
2024	5
2025	5
2026	5
2027	5
Remaining years	27
Total Lessor, Operating Lease, Payments to be Received	52
Commonwealth Edison Co [Member]
Schedule of Lessor, Operating Lease, Payments to be Received, Maturity [Line Items]
2023	1
2024	1
2025	0
2026	0
2027	0
Remaining years	0
Total Lessor, Operating Lease, Payments to be Received	2
PECO Energy Co [Member]
Schedule of Lessor, Operating Lease, Payments to be Received, Maturity [Line Items]
2023	0
2024	0
2025	0
2026	0
2027	0
Remaining years	4
Total Lessor, Operating Lease, Payments to be Received	4
Baltimore Gas and Electric Company [Member]
Schedule of Lessor, Operating Lease, Payments to be Received, Maturity [Line Items]
2023	0
2024	0
2025	0
2026	0
2027	0
Remaining years	1
Total Lessor, Operating Lease, Payments to be Received	1
Pepco Holdings LLC [Member]
Schedule of Lessor, Operating Lease, Payments to be Received, Maturity [Line Items]
2023	4
2024	3
2025	4
2026	5
2027	5
Remaining years	23
Total Lessor, Operating Lease, Payments to be Received	44
Potomac Electric Power Company [Member]
Schedule of Lessor, Operating Lease, Payments to be Received, Maturity [Line Items]
2023	0
2024	0
2025	0
2026	0
2027	0
Remaining years	0
Total Lessor, Operating Lease, Payments to be Received	0
Delmarva Power & Light Company [Member]
Schedule of Lessor, Operating Lease, Payments to be Received, Maturity [Line Items]
2023	3
2024	3
2025	5
2026	4
2027	4
Remaining years	22
Total Lessor, Operating Lease, Payments to be Received	$ 41

Asset Impairments - Narrative (

Asset Impairments - Narrative (Details) $ in Millions	12 Months Ended
Asset Impairments - Narrative (Details) $ in Millions	Dec. 31, 2022 USD ($)
Property, Plant and Equipment [Line Items]
Asset Impairment Charges	$ 48
Baltimore Gas and Electric Company [Member]
Property, Plant and Equipment [Line Items]
Asset Impairment Charges	$ 48

Intangible Assets - Narrative (

Intangible Assets - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Mar. 24, 2016	Oct. 20, 2000
Goodwill [Line Items]
Goodwill, Additions	$ 0	$ 0
Goodwill Impairment Loss	0	0
Goodwill	6,630	6,630
Commonwealth Edison Co [Member]
Goodwill [Line Items]
Goodwill	2,625	2,625		$ 2,600
Pepco Holdings LLC [Member]
Goodwill [Line Items]
Goodwill	$ 4,005	$ 4,005	$ 4,000
Potomac Electric Power Company [Member]
Goodwill [Line Items]
Goodwill			2,100
Delmarva Power & Light Company [Member]
Goodwill [Line Items]
Goodwill			1,400
Atlantic City Electric Company [Member]
Goodwill [Line Items]
Goodwill			$ 500

Intangible Assets - Schedule of

Intangible Assets - Schedule of Goodwill (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Mar. 24, 2016	Oct. 20, 2000
Goodwill [Line Items]
Goodwill, Gross	$ 8,613	$ 8,613
Accumulated Impairment Loss	1,983	1,983
Carrying amount	6,630	6,630
Commonwealth Edison Co [Member]
Goodwill [Line Items]
Goodwill, Gross	4,608	4,608
Accumulated Impairment Loss	1,983	1,983
Carrying amount	2,625	2,625		$ 2,600
Pepco Holdings LLC [Member]
Goodwill [Line Items]
Goodwill, Gross	4,005	4,005
Accumulated Impairment Loss	0	0
Carrying amount	$ 4,005	$ 4,005	$ 4,000

Intangible Assets - Schedule _2

Intangible Assets - Schedule of Other Intangible Assets (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items]
Gross	$ (1,434)	$ (1,434)
Accumulated Amortization	1,409	1,227
Net	(25)	(207)
Unamortized Energy Contracts [Member]
Finite-Lived Intangible Assets [Line Items]
Gross	(1,515)	(1,515)
Accumulated Amortization	1,470	1,280
Net	(45)	(235)
Business Services Company [Member] \| Licensing Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Gross	81	81
Accumulated Amortization	(61)	(53)
Net	20	28
Pepco Holdings LLC [Member] \| Unamortized Energy Contracts [Member]
Finite-Lived Intangible Assets [Line Items]
Gross	(1,515)	(1,515)
Accumulated Amortization	1,470	1,280
Net	$ (45)	$ (235)

Intangible Assets Intangible As

Intangible Assets Intangible Assets - Summary of Amortization Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Intangible asset amortization expense	$ (182)	$ (83)	$ (98)
Pepco Holdings LLC [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible asset amortization expense	$ (190)	$ (92)	$ (115)

Intangible Assets Intangible _2

Intangible Assets Intangible Assets - Schedule of Finite-Lived Intangible Assets, Future Amortization Expense (Details) $ in Millions	Dec. 31, 2022 USD ($)
Finite-Lived Intangible Assets [Line Items]
2023	$ (2)
2024	0
2025	(2)
2026	(5)
2027	(4)
Pepco Holdings LLC [Member]
Finite-Lived Intangible Assets [Line Items]
2023	(10)
2024	(8)
2025	(5)
2026	(5)
2027	$ (4)

Income Taxes - Narrative (Detai

Income Taxes - Narrative (Details) - USD ($) $ in Millions				12 Months Ended			84 Months Ended
Income Taxes - Narrative (Details) - USD ($) $ in Millions	Jan. 01, 2031	Jan. 01, 2023	Jul. 08, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Jan. 01, 2031	Mar. 31, 2022
Income Tax Additional Narrative Information [Line Items]
Income tax expense related to separation				$ 148
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount				67
Income Tax Credits and Adjustments				15
Income Taxes Receivable, Current				18				$ 55
Notes Payable, Current				169				11
Notes Payable, Noncurrent				362				$ 484
State and Local Jurisdiction [Member]
Income Tax Additional Narrative Information [Line Items]
Increase (Decrease) in Deferred Income Taxes				67	$ 27	$ 66
Increase (Decrease) in Income Taxes				67	$ 27	$ 66
State and Local Jurisdiction [Member] \| Atlantic City Electric Company [Member]
Income Tax Additional Narrative Information [Line Items]
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit				14
Federal and State
Income Tax Additional Narrative Information [Line Items]
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount				40
Income Tax Credits and Adjustments				17
Total transaction costs taxes relating to the Separation				24
PENNSYLVANIA
Income Tax Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Assets				428
Increase (Decrease) in Deferred Income Taxes				390
Change in Enacted Tax Rate, Percent	4.99%	8.99%	9.99%				(0.50%)
Increase (Decrease) in Income Taxes				38
PENNSYLVANIA \| PECO Energy Co [Member]
Income Tax Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Assets				428
Increase (Decrease) in Deferred Income Taxes				390
Change in Enacted Tax Rate, Percent	4.99%	8.99%	9.99%				(0.50%)
Increase (Decrease) in Income Taxes				$ 38

Income Taxes - Components of In

Income Taxes - Components of Income Tax Expense (Benefit) from Continuing Operations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Taxes [Line Items]
Income taxes	$ 349	$ 38	$ (7)
Commonwealth Edison Co [Member]
Income Taxes [Line Items]
Income taxes	264	172	177
PECO Energy Co [Member]
Income Taxes [Line Items]
Income taxes	79	12	(30)
Baltimore Gas and Electric Company [Member]
Income Taxes [Line Items]
Income taxes	8	(35)	41
Pepco Holdings LLC [Member]
Income Taxes [Line Items]
Income taxes	9	42	(77)
Potomac Electric Power Company [Member]
Income Taxes [Line Items]
Income taxes	(9)	15	(7)
Delmarva Power & Light Company [Member]
Income Taxes [Line Items]
Income taxes	14	42	(25)
Atlantic City Electric Company [Member]
Income Taxes [Line Items]
Income taxes	3	(13)	(41)
Internal Revenue Service (IRS) [Member]
Income Taxes [Line Items]
Current	(24)	(152)	(180)
Deferred	106	89	10
Investment Tax Credit	(3)	(2)	(3)
Internal Revenue Service (IRS) [Member] \| Commonwealth Edison Co [Member]
Income Taxes [Line Items]
Current	29	(30)	(24)
Deferred	117	113	112
Investment Tax Credit	(1)	(1)	(2)
Internal Revenue Service (IRS) [Member] \| PECO Energy Co [Member]
Income Taxes [Line Items]
Current	13	1	(7)
Deferred	18	20	1
Investment Tax Credit	0	0	0
Internal Revenue Service (IRS) [Member] \| Baltimore Gas and Electric Company [Member]
Income Taxes [Line Items]
Current	(1)	(18)	4
Deferred	(3)	34	10
Investment Tax Credit	0	0	0
Internal Revenue Service (IRS) [Member] \| Pepco Holdings LLC [Member]
Income Taxes [Line Items]
Current	16	18	25
Deferred	(23)	(52)	(129)
Investment Tax Credit	(1)	(1)	(1)
Internal Revenue Service (IRS) [Member] \| Potomac Electric Power Company [Member]
Income Taxes [Line Items]
Current	9	22	40
Deferred	(2)	(17)	(62)
Investment Tax Credit	0	0	0
Internal Revenue Service (IRS) [Member] \| Delmarva Power & Light Company [Member]
Income Taxes [Line Items]
Current	(2)	2	(13)
Deferred	2	(14)	(20)
Investment Tax Credit	0	0	0
Internal Revenue Service (IRS) [Member] \| Atlantic City Electric Company [Member]
Income Taxes [Line Items]
Current	6	1	(4)
Deferred	(15)	(26)	(43)
Investment Tax Credit	0	0	0
State and Local Jurisdiction [Member]
Income Taxes [Line Items]
Current	(13)	(46)	(37)
Deferred	283	149	203
State and Local Jurisdiction [Member] \| Commonwealth Edison Co [Member]
Income Taxes [Line Items]
Current	(6)	(41)	(27)
Deferred	125	131	118
State and Local Jurisdiction [Member] \| PECO Energy Co [Member]
Income Taxes [Line Items]
Current	(4)	0	0
Deferred	52	(9)	(24)
State and Local Jurisdiction [Member] \| Baltimore Gas and Electric Company [Member]
Income Taxes [Line Items]
Current	0	0	0
Deferred	12	(51)	27
State and Local Jurisdiction [Member] \| Pepco Holdings LLC [Member]
Income Taxes [Line Items]
Current	2	0	(5)
Deferred	15	77	33
State and Local Jurisdiction [Member] \| Potomac Electric Power Company [Member]
Income Taxes [Line Items]
Current	0	1	0
Deferred	(16)	9	15
State and Local Jurisdiction [Member] \| Delmarva Power & Light Company [Member]
Income Taxes [Line Items]
Current	0	1	0
Deferred	14	53	8
State and Local Jurisdiction [Member] \| Atlantic City Electric Company [Member]
Income Taxes [Line Items]
Current	0	0	0
Deferred	$ 12	$ 12	$ 6

Income Taxes - Reconciliation t

Income Taxes - Reconciliation to Effective Tax Rate (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate [Line Items]
U.S. Federal statutory rate	21%	21%	21%
State income taxes, net of Federal income tax benefit	8.80%	5%	11.90%
Plant basis differences	(4.10%)	(5.40%)	(8.60%)
Excess deferred tax amortization	(11.80%)	(17.20%)	(29.10%)
Amortization of investment tax credit, including deferred taxes on basis difference	(0.10%)	(0.10%)	(0.30%)
Production tax credits and other credits	0.10%	(0.70%)	(0.50%)
Effective Income Tax Rate Reconciliation, Deferred Prosecution Agreement payments			3.80%
Other	0.60%	(0.30%)	1.20%
Effective income tax rate	14.50%	2.30%	(0.60%)
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount	$ 9
Income Tax Credits and Adjustments	15
Federal and State
Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate [Line Items]
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount	11
Current State and Local Tax Expense (Benefit)	43
Income Tax Credits and Adjustments	$ 17
Commonwealth Edison Co [Member]
Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate [Line Items]
U.S. Federal statutory rate	21%	21%	21%
State income taxes, net of Federal income tax benefit	8%	7.80%	11.60%
Plant basis differences	(0.60%)	(0.80%)	(0.60%)
Excess deferred tax amortization	(5.60%)	(7.60%)	(11.20%)
Amortization of investment tax credit, including deferred taxes on basis difference	(0.10%)	(0.10%)	(0.30%)
Production tax credits and other credits	(0.30%)	(0.50%)	(0.30%)
Effective Income Tax Rate Reconciliation, Deferred Prosecution Agreement payments			6.80%
Other	0%	(1.00%)	1.80%
Effective income tax rate	22.40%	18.80%	28.80%
PECO Energy Co [Member]
Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate [Line Items]
U.S. Federal statutory rate	21%	21%	21%
State income taxes, net of Federal income tax benefit	5.80%	(1.40%)	(4.50%)
Plant basis differences	(11.90%)	(13.60%)	(18.70%)
Excess deferred tax amortization	(3.00%)	(3.80%)	(4.60%)
Amortization of investment tax credit, including deferred taxes on basis difference	0%	0%	0%
Production tax credits and other credits	0%	0%	0%
Effective Income Tax Rate Reconciliation, Deferred Prosecution Agreement payments			0%
Other	0.20%	0.10%	(0.40%)
Effective income tax rate	12.10%	2.30%	(7.20%)
Baltimore Gas and Electric Company [Member]
Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate [Line Items]
U.S. Federal statutory rate	21%	21%	21%
State income taxes, net of Federal income tax benefit	2.60%	(10.80%)	5.50%
Plant basis differences	(1.00%)	(1.70%)	(1.50%)
Excess deferred tax amortization	(19.80%)	(16.30%)	(13.90%)
Amortization of investment tax credit, including deferred taxes on basis difference	(0.10%)	(0.10%)	(0.10%)
Production tax credits and other credits	(0.70%)	(0.90%)	(0.40%)
Effective Income Tax Rate Reconciliation, Deferred Prosecution Agreement payments			0%
Other	0.10%	(0.60%)	(0.10%)
Effective income tax rate	2.10%	(9.40%)	10.50%
Pepco Holdings LLC [Member]
Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate [Line Items]
U.S. Federal statutory rate	21%	21%	21%
State income taxes, net of Federal income tax benefit	2.10%	10.10%	5.10%
Plant basis differences	(1.70%)	(1.10%)	(1.60%)
Excess deferred tax amortization	(19.50%)	(22.40%)	(42.00%)
Amortization of investment tax credit, including deferred taxes on basis difference	(0.10%)	(0.10%)	(0.20%)
Production tax credits and other credits	(0.70%)	(0.50%)	(0.30%)
Effective Income Tax Rate Reconciliation, Deferred Prosecution Agreement payments			0%
Other	0.40%	0%	(0.40%)
Effective income tax rate	1.50%	7%	(18.40%)
Potomac Electric Power Company [Member]
Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate [Line Items]
U.S. Federal statutory rate	21%	21%	21%
State income taxes, net of Federal income tax benefit	(4.10%)	2.70%	4.50%
Plant basis differences	(2.70%)	(1.60%)	(1.70%)
Excess deferred tax amortization	(16.80%)	(16.40%)	(25.40%)
Amortization of investment tax credit, including deferred taxes on basis difference	0%	0%	(0.10%)
Production tax credits and other credits	(0.70%)	(0.50%)	(0.30%)
Effective Income Tax Rate Reconciliation, Deferred Prosecution Agreement payments			0%
Other	0.30%	(0.40%)	(0.70%)
Effective income tax rate	(3.00%)	4.80%	(2.70%)
Delmarva Power & Light Company [Member]
Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate [Line Items]
U.S. Federal statutory rate	21%	21%	21%
State income taxes, net of Federal income tax benefit	6.50%	25%	6.60%
Plant basis differences	(0.70%)	(0.80%)	(0.40%)
Excess deferred tax amortization	(18.40%)	(20.00%)	(51.70%)
Amortization of investment tax credit, including deferred taxes on basis difference	(0.20%)	(0.20%)	(0.30%)
Production tax credits and other credits	(0.60%)	(0.40%)	(0.30%)
Effective Income Tax Rate Reconciliation, Deferred Prosecution Agreement payments			0%
Other	0.10%	0.10%	0.10%
Effective income tax rate	7.70%	24.70%	(25.00%)
Atlantic City Electric Company [Member]
Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate [Line Items]
U.S. Federal statutory rate	21%	21%	21%
State income taxes, net of Federal income tax benefit	6.90%	7.40%	7%
Plant basis differences	(0.70%)	(0.20%)	(3.00%)
Excess deferred tax amortization	(24.50%)	(37.10%)	(82.10%)
Amortization of investment tax credit, including deferred taxes on basis difference	(0.20%)	(0.20%)	(0.50%)
Production tax credits and other credits	(0.50%)	(0.50%)	(0.50%)
Effective Income Tax Rate Reconciliation, Deferred Prosecution Agreement payments			0%
Other	0%	(0.20%)	0.40%
Effective income tax rate	2%	(9.80%)	(57.70%)
Delmarva Power & Light Co
Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate [Line Items]
Operating Loss Carryforwards, Valuation Allowance	$ 31

Income Taxes - Tax Effects of T

Income Taxes - Tax Effects of Temporary Differences and Carryforwards (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Operating Loss Carryforwards [Line Items]
Plant basis differences	$ (12,130)	$ (11,606)
Deferred Tax Liabilities, Other Finite-Lived Assets	10	56
Derivatives and other financial instruments	26	63
Deferred pension and postretirement obligation	551	641
Deferred debt refinancing costs	132	146
Deferred Tax Liabilities, Regulatory Assets and Liabilities	(1,107)	(1,130)
Tax loss carryforward, net of valuation allowances	250	242
Tax credit carryforward	468	584
Investment in partnerships	(21)	(21)
Other, net	591	449
Deferred income tax liabilities (net)	(11,230)	(10,576)
Unamortized investment tax credits	(14)	(15)
Total deferred income tax liabilities (net) and unamortized investment tax credits	(11,244)	(10,591)
Commonwealth Edison Co [Member]
Operating Loss Carryforwards [Line Items]
Plant basis differences	(4,823)	(4,648)
Deferred Tax Liabilities, Other Finite-Lived Assets	0	0
Derivatives and other financial instruments	23	61
Deferred pension and postretirement obligation	(300)	(308)
Deferred debt refinancing costs	(5)	(6)
Deferred Tax Liabilities, Regulatory Assets and Liabilities	(131)	8
Tax loss carryforward, net of valuation allowances	0	0
Tax credit carryforward	0	0
Investment in partnerships	0	0
Other, net	223	216
Deferred income tax liabilities (net)	(5,013)	(4,677)
Unamortized investment tax credits	(8)	(8)
Total deferred income tax liabilities (net) and unamortized investment tax credits	(5,021)	(4,685)
PECO Energy Co [Member]
Operating Loss Carryforwards [Line Items]
Plant basis differences	(2,119)	(2,271)
Deferred Tax Liabilities, Other Finite-Lived Assets	0	0
Derivatives and other financial instruments	0	0
Deferred pension and postretirement obligation	(31)	(32)
Deferred debt refinancing costs	0	0
Deferred Tax Liabilities, Regulatory Assets and Liabilities	(169)	(280)
Tax loss carryforward, net of valuation allowances	33	65
Tax credit carryforward	0	0
Investment in partnerships	0	0
Other, net	73	97
Deferred income tax liabilities (net)	(2,213)	(2,421)
Unamortized investment tax credits	0	0
Total deferred income tax liabilities (net) and unamortized investment tax credits	(2,213)	(2,421)
Baltimore Gas and Electric Company [Member]
Operating Loss Carryforwards [Line Items]
Plant basis differences	(1,949)	(1,826)
Deferred Tax Liabilities, Other Finite-Lived Assets	0	0
Derivatives and other financial instruments	0	0
Deferred pension and postretirement obligation	(31)	(37)
Deferred debt refinancing costs	(2)	(2)
Deferred Tax Liabilities, Regulatory Assets and Liabilities	57	92
Tax loss carryforward, net of valuation allowances	72	68
Tax credit carryforward	0	0
Investment in partnerships	0	0
Other, net	23	21
Deferred income tax liabilities (net)	(1,830)	(1,684)
Unamortized investment tax credits	(2)	(2)
Total deferred income tax liabilities (net) and unamortized investment tax credits	(1,832)	(1,686)
Pepco Holdings LLC [Member]
Operating Loss Carryforwards [Line Items]
Plant basis differences	(3,131)	(2,976)
Deferred Tax Liabilities, Other Finite-Lived Assets	10	56
Derivatives and other financial instruments	2	2
Deferred pension and postretirement obligation	(80)	(90)
Deferred debt refinancing costs	111	123
Deferred Tax Liabilities, Regulatory Assets and Liabilities	(50)	(53)
Tax loss carryforward, net of valuation allowances	71	64
Tax credit carryforward	0	0
Investment in partnerships	0	0
Other, net	182	212
Deferred income tax liabilities (net)	(2,885)	(2,662)
Unamortized investment tax credits	(4)	(5)
Total deferred income tax liabilities (net) and unamortized investment tax credits	(2,889)	(2,667)
Potomac Electric Power Company [Member]
Operating Loss Carryforwards [Line Items]
Plant basis differences	(1,394)	(1,321)
Deferred Tax Liabilities, Other Finite-Lived Assets	0	0
Derivatives and other financial instruments	0	0
Deferred pension and postretirement obligation	(76)	(76)
Deferred debt refinancing costs	(4)	(2)
Deferred Tax Liabilities, Regulatory Assets and Liabilities	7	24
Tax loss carryforward, net of valuation allowances	3	2
Tax credit carryforward	0	0
Investment in partnerships	0	0
Other, net	83	99
Deferred income tax liabilities (net)	(1,381)	(1,274)
Unamortized investment tax credits	(1)	(1)
Total deferred income tax liabilities (net) and unamortized investment tax credits	(1,382)	(1,275)
Delmarva Power & Light Company [Member]
Operating Loss Carryforwards [Line Items]
Plant basis differences	(906)	(853)
Deferred Tax Liabilities, Other Finite-Lived Assets	0	0
Derivatives and other financial instruments	0	0
Deferred pension and postretirement obligation	(39)	(40)
Deferred debt refinancing costs	(2)	(1)
Deferred Tax Liabilities, Regulatory Assets and Liabilities	43	55
Tax loss carryforward, net of valuation allowances	20	18
Tax credit carryforward	0	0
Investment in partnerships	0	0
Other, net	16	19
Deferred income tax liabilities (net)	(868)	(802)
Unamortized investment tax credits	(1)	(1)
Total deferred income tax liabilities (net) and unamortized investment tax credits	(869)	(803)
Atlantic City Electric Company [Member]
Operating Loss Carryforwards [Line Items]
Plant basis differences	(813)	(777)
Deferred Tax Liabilities, Other Finite-Lived Assets	0	0
Derivatives and other financial instruments	0	0
Deferred pension and postretirement obligation	(3)	(6)
Deferred debt refinancing costs	(1)	(1)
Deferred Tax Liabilities, Regulatory Assets and Liabilities	11	31
Tax loss carryforward, net of valuation allowances	46	42
Tax credit carryforward	0	0
Investment in partnerships	0	0
Other, net	28	34
Deferred income tax liabilities (net)	(732)	(677)
Unamortized investment tax credits	(2)	(2)
Total deferred income tax liabilities (net) and unamortized investment tax credits	$ (734)	$ (679)

Income Taxes - Schedule of Carr

Income Taxes - Schedule of Carryforwards and Corresponding Valuation Allowances (Details) $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($)
Internal Revenue Service (IRS) [Member] \| General Business Tax Credit Carryforward [Member]
Operating Loss Carryforwards [Line Items]
Federal general business credits carryforwards(a)	$ 468
Internal Revenue Service (IRS) [Member] \| General Business Tax Credit Carryforward [Member] \| PECO Energy Co [Member]
Operating Loss Carryforwards [Line Items]
Federal general business credits carryforwards(a)	0
Internal Revenue Service (IRS) [Member] \| General Business Tax Credit Carryforward [Member] \| Baltimore Gas and Electric Company [Member]
Operating Loss Carryforwards [Line Items]
Federal general business credits carryforwards(a)	0
Internal Revenue Service (IRS) [Member] \| General Business Tax Credit Carryforward [Member] \| Pepco Holdings LLC [Member]
Operating Loss Carryforwards [Line Items]
Federal general business credits carryforwards(a)	0
Internal Revenue Service (IRS) [Member] \| General Business Tax Credit Carryforward [Member] \| Potomac Electric Power Company [Member]
Operating Loss Carryforwards [Line Items]
Federal general business credits carryforwards(a)	0
Internal Revenue Service (IRS) [Member] \| General Business Tax Credit Carryforward [Member] \| Delmarva Power & Light Company [Member]
Operating Loss Carryforwards [Line Items]
Federal general business credits carryforwards(a)	0
Internal Revenue Service (IRS) [Member] \| General Business Tax Credit Carryforward [Member] \| Atlantic City Electric Company [Member]
Operating Loss Carryforwards [Line Items]
Federal general business credits carryforwards(a)	0
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
State net operating loss carryforwards	4,991
Deferred taxes on state tax attributes (net of federal taxes)	307
Valuation allowance on state tax attributes (net of federal taxes)(b)	$ 57
Operating Loss Carryforwards, Expiration Date	Dec. 31, 2035
State and Local Jurisdiction [Member] \| PECO Energy Co [Member]
Operating Loss Carryforwards [Line Items]
State net operating loss carryforwards	$ 970
Deferred taxes on state tax attributes (net of federal taxes)	37
Valuation allowance on state tax attributes (net of federal taxes)(b)	$ 4
Operating Loss Carryforwards, Expiration Date	Dec. 31, 2032
State and Local Jurisdiction [Member] \| Baltimore Gas and Electric Company [Member]
Operating Loss Carryforwards [Line Items]
State net operating loss carryforwards	$ 1,142
Deferred taxes on state tax attributes (net of federal taxes)	72
Valuation allowance on state tax attributes (net of federal taxes)(b)	$ 0
Operating Loss Carryforwards, Expiration Date	Dec. 31, 2033
State and Local Jurisdiction [Member] \| Pepco Holdings LLC [Member]
Operating Loss Carryforwards [Line Items]
State net operating loss carryforwards	$ 1,501
Deferred taxes on state tax attributes (net of federal taxes)	104
Valuation allowance on state tax attributes (net of federal taxes)(b)	$ 33
Operating Loss Carryforwards, Expiration Date	Dec. 31, 2029
State and Local Jurisdiction [Member] \| Potomac Electric Power Company [Member]
Operating Loss Carryforwards [Line Items]
State net operating loss carryforwards	$ 50
Deferred taxes on state tax attributes (net of federal taxes)	3
Valuation allowance on state tax attributes (net of federal taxes)(b)	0
State and Local Jurisdiction [Member] \| Delmarva Power & Light Company [Member]
Operating Loss Carryforwards [Line Items]
State net operating loss carryforwards	768
Deferred taxes on state tax attributes (net of federal taxes)	52
Valuation allowance on state tax attributes (net of federal taxes)(b)	$ 32
Operating Loss Carryforwards, Expiration Date	Dec. 31, 2032
State and Local Jurisdiction [Member] \| Atlantic City Electric Company [Member]
Operating Loss Carryforwards [Line Items]
State net operating loss carryforwards	$ 651
Deferred taxes on state tax attributes (net of federal taxes)	46
Valuation allowance on state tax attributes (net of federal taxes)(b)	$ 0
Operating Loss Carryforwards, Expiration Date	Dec. 31, 2031

Income Taxes - Rollforward of U

Income Taxes - Rollforward of Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized Tax Benefits - Beginning Balance	$ 143	$ 125	$ 95
Unrecognized Tax Benefits, Period Increase (Decrease)	(1)	13	6
Increases based on tax positions related to current year	3	4	3
Increases based on tax positions prior to current year	3	4	26
Decreases based on tax positions prior to current year	0	(3)	(5)
Unrecognized tax benefits - Ending Balance	148	143	125
Income Taxes Receivable, Noncurrent	50
Pepco Holdings LLC [Member]
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized Tax Benefits - Beginning Balance	56	52	48
Unrecognized Tax Benefits, Period Increase (Decrease)	1	3	3
Increases based on tax positions related to current year	2	1	0
Increases based on tax positions prior to current year	0	0	1
Decreases based on tax positions prior to current year	0	0	0
Unrecognized tax benefits - Ending Balance	59	56	52
Atlantic City Electric Company [Member]
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized Tax Benefits - Beginning Balance	16	15	14
Unrecognized Tax Benefits, Period Increase (Decrease)	1	1	1
Increases based on tax positions related to current year	0	0	0
Increases based on tax positions prior to current year	0	0	0
Decreases based on tax positions prior to current year	0	0	0
Unrecognized tax benefits - Ending Balance	$ 17	$ 16	$ 15

Income Taxes - Recognition of U

Income Taxes - Recognition of Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Recognition of Unrecognized Tax Benefits [Line Items]
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	$ 90	$ 77	$ 73

Income Taxes - Summary of Inter

Income Taxes - Summary of Interest and Penalties Receivable (Payable) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Income Taxes [Line Items]
Net Interest Receivable Payable Related To Uncertain Tax Positions	$ 45	$ 43
Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority	272
Other	1,141	$ 885
Exelon Generation Co L L C [Member]
Income Taxes [Line Items]
Other	$ 1

Income Taxes - Long-Term Margin

Income Taxes - Long-Term Marginal State Income Tax Rate (Details) - State and Local Jurisdiction [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Long-Term Marginal State Income Tax Rate [Line Items]
Increase (Decrease) in Deferred Income Taxes	$ 67	$ 27	$ 66
Increase (Decrease) in Income Taxes	$ 67	$ 27	$ 66

Income Taxes - Allocation of Ta

Income Taxes - Allocation of Tax Benefits (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Commonwealth Edison Co [Member]
Income Taxes [Line Items]
Allocation Of Federal Tax Benefit Under Tax Sharing Agreement	$ 1	$ 1	$ 14
PECO Energy Co [Member]
Income Taxes [Line Items]
Allocation Of Federal Tax Benefit Under Tax Sharing Agreement	47	19	17
Baltimore Gas and Electric Company [Member]
Income Taxes [Line Items]
Allocation Of Federal Tax Benefit Under Tax Sharing Agreement	0	0	0
Pepco Holdings LLC [Member]
Income Taxes [Line Items]
Allocation Of Federal Tax Benefit Under Tax Sharing Agreement	28	17	17
Potomac Electric Power Company [Member]
Income Taxes [Line Items]
Allocation Of Federal Tax Benefit Under Tax Sharing Agreement	23	16	8
Delmarva Power and Light Company [Member]
Income Taxes [Line Items]
Allocation Of Federal Tax Benefit Under Tax Sharing Agreement	3	0	6
Atlantic City Electric Company [Member]
Income Taxes [Line Items]
Allocation Of Federal Tax Benefit Under Tax Sharing Agreement	$ 2	$ 0	$ 1

Retirement Benefits- Narrative

Retirement Benefits- Narrative (Details) - USD ($) $ in Millions			3 Months Ended	11 Months Ended	12 Months Ended
	Mar. 02, 2022	Feb. 01, 2022	Mar. 31, 2022	Dec. 31, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Increase (Decrease) in Obligation, Pension Benefits			$ 24	$ 921
Benefit obligation increase (decrease) reflecting actual census data			(5)	893
Accumulated Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), after Tax		$ 1,994	5
Regulatory asset increase (decrease) due to updated valuation adjustment			30	14
Defined benefit plan, amounts increased (decrease) in regulatory liabilities, before tax			$ 3	5
Defined Contribution Plan, Employer Discretionary Contribution Amount					$ 91	$ 90	$ 95
Payment for Pension and Other Postretirement Benefits					616	665	601
Pension Plan, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Accumulated Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), after Tax				(2,631)	(2,631)	0	0
Regulatory asset increase (decrease) due to updated valuation adjustment					$ (435)	$ (581)	$ 140
Expected return on plan assets					7%	7%	7%
Discount rate					3.24%	2.58%	3.34%
Defined Contribution Plan, Employer Discretionary Contribution Amount					$ 20
Payment for Pension and Other Postretirement Benefits	$ 33	$ 207			570	$ 343	$ 306
Other Postretirement Benefit Plan, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Accumulated Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), after Tax				$ (43)	(43)	0	0
Regulatory asset increase (decrease) due to updated valuation adjustment					$ (233)	$ (144)	$ (20)
Expected return on plan assets					6.44%	6.46%	6.69%
Discount rate					3.20%	2.51%	3.31%
Payment for Pension and Other Postretirement Benefits					$ 42	$ 63	$ 40
Change in Assumptions for Defined Benefit Plans [Member] \| Pension Plan, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Expected return on plan assets					7%
Discount rate					3.24%
Change in Assumptions for Defined Benefit Plans [Member] \| Other Postretirement Benefit Plan, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Expected return on plan assets					6.44%
Discount rate					3.20%
Assets [Member] \| Pension Plan, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Actual Asset Returns					(18.69%)
Assets [Member] \| Other Postretirement Benefit Plan, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Actual Asset Returns					(11.36%)
Subsequent Event [Member] \| Pension Plan, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Expected return on plan assets					7%
Subsequent Event [Member] \| Other Postretirement Benefit Plan, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Expected return on plan assets					6.50%

Retirement Benefits - Summary o

Retirement Benefits - Summary of Changes in Benefit Obligations and Plan Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Pension Plan, Defined Benefit [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Net benefit obligation as of the beginning of year	$ 14,236	$ 14,861
Service cost	236	294	$ 251
Interest cost	439	406	476
Defined Benefit Plan, Benefit Obligation, Contributions by Plan Participant	0	0
Actuarial (gain) loss(a)	(3,379)	(442)
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Remeasurement due to Settlement	0	(23)
Defined Benefit Plan, Benefit Obligation, Benefits Paid	(855)	(860)
Net benefit obligation as of the end of year	10,677	14,236	14,861
Fair value of net plan assets as of the beginning of year	12,165	11,883
Actual return on plan assets	(2,359)	822
Employer contributions	570	343
Defined Benefit Plan, Plan Assets, Contributions by Plan Participant	0	0
Defined Benefit Plan, Plan Assets, Benefits Paid	(855)	(860)
Defined Benefit Plan, Plan Assets, Payment for Settlement	0	(23)
Fair value of net plan assets as of the end of year	9,521	12,165	11,883
Other Postretirement Benefit Plan, Defined Benefit [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Net benefit obligation as of the beginning of year	2,502	2,661
Service cost	41	51	56
Interest cost	76	69	93
Defined Benefit Plan, Benefit Obligation, Contributions by Plan Participant	26	32
Actuarial (gain) loss(a)	(604)	(116)
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Remeasurement due to Settlement	0	(5)
Defined Benefit Plan, Benefit Obligation, Benefits Paid	(157)	(190)
Net benefit obligation as of the end of year	1,884	2,502	2,661
Fair value of net plan assets as of the beginning of year	1,665	1,635
Actual return on plan assets	(225)	130
Employer contributions	42	63
Defined Benefit Plan, Plan Assets, Contributions by Plan Participant	26	32
Defined Benefit Plan, Plan Assets, Benefits Paid	(157)	(190)
Defined Benefit Plan, Plan Assets, Payment for Settlement	0	(5)
Fair value of net plan assets as of the end of year	$ 1,351	$ 1,665	$ 1,635

Retirement Benefits - Benefit O

Retirement Benefits - Benefit Obligations and Plan Assets in Balance Sheet (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Pension Plan, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Other current liabilities	$ 47	$ 20
Pension obligations	1,109	2,051
Non-pension postretirement benefit obligations	0	0
Unfunded status (net benefit obligation less plan assets)	1,156	2,071
Other Postretirement Benefit Plan, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Other current liabilities	26	26
Pension obligations	0	0
Non-pension postretirement benefit obligations	507	811
Unfunded status (net benefit obligation less plan assets)	$ 533	$ 837

Retirement Benefits- Projected

Retirement Benefits- Projected Benefit Obligations and Accumulated Benefit Obligations in Excess of Plan Assets (Details) - Accumulated Benefit Obligation In Excess Of Plan Assets [Member] - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
ABO	$ 10,108	$ 13,497
Fair value of net plan assets	$ 9,427	$ 12,165

Retirement Benefits - Component

Retirement Benefits - Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Amortization of:
Non-service net periodic benefit cost	$ 63	$ 91	$ 53
Pension Plan, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	236	294	251
Interest cost	439	406	476
Expected return on assets	(822)	(843)	(796)
Amortization of:
Prior service cost (credit)	2	2	3
Actuarial loss	295	399	349
Curtailment benefits	0	0	0
Settlement and other charges	0	7	6
Non-service net periodic benefit cost	150	265	289
Other Postretirement Benefit Plan, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	41	51	56
Interest cost	76	69	93
Expected return on assets	(99)	(99)	(101)
Amortization of:
Prior service cost (credit)	(19)	(25)	(76)
Actuarial loss	12	27	34
Curtailment benefits	0	0	(1)
Settlement and other charges	0	1	1
Non-service net periodic benefit cost	$ 11	$ 24	$ 6

Retirement Benefits - Allocated

Retirement Benefits - Allocated Portion of Pension and Postretirement Benefit Plan Costs (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Pension and non-pension postretirement benefit costs	$ 164	$ 411	$ 411
Pension and other post retirement benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Pension and non-pension postretirement benefit costs	161	288	296
Commonwealth Edison Co [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Pension and non-pension postretirement benefit costs	60	129	114
Commonwealth Edison Co [Member] \| Pension and other post retirement benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Pension and non-pension postretirement benefit costs	60	129	114
PECO Energy Co [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Pension and non-pension postretirement benefit costs	(9)	8	5
PECO Energy Co [Member] \| Pension and other post retirement benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Pension and non-pension postretirement benefit costs	(9)	8	5
Baltimore Gas and Electric Company [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Pension and non-pension postretirement benefit costs	44	61	62
Baltimore Gas and Electric Company [Member] \| Pension and other post retirement benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Pension and non-pension postretirement benefit costs	44	64	64
Pepco Holdings LLC [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Pension and non-pension postretirement benefit costs	53	49	70
Pepco Holdings LLC [Member] \| Pension and other post retirement benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Pension and non-pension postretirement benefit costs	53	49	70
Potomac Electric Power Company [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Pension and non-pension postretirement benefit costs	9	6	15
Potomac Electric Power Company [Member] \| Pension and other post retirement benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Pension and non-pension postretirement benefit costs	9	6	15
Delmarva Power & Light Company [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Pension and non-pension postretirement benefit costs	3	2	7
Delmarva Power & Light Company [Member] \| Pension and other post retirement benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Pension and non-pension postretirement benefit costs	3	2	7
Atlantic City Electric Company [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Pension and non-pension postretirement benefit costs	12	11	14
Atlantic City Electric Company [Member] \| Pension and other post retirement benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Pension and non-pension postretirement benefit costs	$ 12	$ 11	$ 14

Retirement Benefits - Compone_2

Retirement Benefits - Components of Accumulated Other Comprehensive Income and Regulatory Assets (Liabilities) related to Retirement Plans (Details) - USD ($) $ in Millions	3 Months Ended	11 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Feb. 01, 2022
Defined Benefit Plan Disclosure [Line Items]
Accumulated Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), after Tax	$ 5					$ 1,994
Defined benefit plan, amounts recognized in regulatory assets, before tax	$ 30	$ 14
Pension Plan, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Current year actuarial (gain) loss			$ (226)	$ (700)	$ 941
Amortization of actuarial loss			(295)	(598)	(512)
Accumulated Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), after Tax		(2,631)	(2,631)	0	0
Current year prior service cost (credit)			0	0	0
Amortization of prior service (cost) credit			(2)	(3)	(4)
Curtailments			0	0	0
Settlements			0	(27)	(14)
Total recognized in AOCI and regulatory assets (liabilities)			(3,154)	(1,328)	411
Defined benefit plan, amounts recognized in OCI, before tax			(2,719)	(747)	271
Defined benefit plan, amounts recognized in regulatory assets, before tax			(435)	(581)	140
Other Postretirement Benefit Plan, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Current year actuarial (gain) loss			(271)	(270)	22
Amortization of actuarial loss			(12)	(37)	(49)
Accumulated Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), after Tax		$ (43)	(43)	0	0
Current year prior service cost (credit)			0	0	(111)
Amortization of prior service (cost) credit			19	34	124
Curtailments			0	0	1
Settlements			0	(1)	(1)
Total recognized in AOCI and regulatory assets (liabilities)			(307)	(274)	(14)
Defined benefit plan, amounts recognized in OCI, before tax			(74)	(130)	6
Defined benefit plan, amounts recognized in regulatory assets, before tax			$ (233)	$ (144)	$ (20)

Retirement Benefits - Gross Acc

Retirement Benefits - Gross Accumulated Other Comprehensive Loss and Regulatory Assets (Liabilities) not Recognized as Components of Periodic Benefit Cost (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Pension Plan, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Prior service cost (credit)	$ 19	$ 32
Actuarial loss (gain)	3,611	6,752
Total	3,630	6,784
Benefits included in accumulated other comprehensive income	873	3,592
Benefits included in regulatory assets (liabilities)	2,757	3,192
Other Postretirement Benefit Plan, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Prior service cost (credit)	(55)	(111)
Actuarial loss (gain)	(133)	230
Total	(188)	119
Benefits included in accumulated other comprehensive income	(21)	53
Benefits included in regulatory assets (liabilities)	$ (167)	$ 66

Retirement Benefits - Assumptio

Retirement Benefits - Assumptions Used in Calculations (Details)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Pension Plan, Defined Benefit [Member]
Defined Benefit Plan Assumptions Used In Calculations [Line Items]
Discount rate - Benefit Obligation	5.53%	2.92%
Benefit Obligation Investment Crediting Rate	5.07%	3.75%
Discount rate - Net Periodic Benefit Costs	3.24%	2.58%	3.34%
Net Periodic Benefit Cost Investment Crediting Rate	3.75%	3.72%	3.82%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets	7%	7%	7%
Pension Plan, Defined Benefit [Member] \| CENG Legacy Benefit Plans [Member] \| Minimum [Member]
Defined Benefit Plan Assumptions Used In Calculations [Line Items]
Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Discount Rate Design Changes	5.46%	2.55%
Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Discount Rate Design Changes	2.55%	2.11%	3.02%
Pension Plan, Defined Benefit [Member] \| CENG Legacy Benefit Plans [Member] \| Maximum [Member]
Defined Benefit Plan Assumptions Used In Calculations [Line Items]
Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Discount Rate Design Changes	5.60%	3.02%
Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Discount Rate Design Changes	3.24%	2.73%	3.44%
Other Postretirement Benefit Plan, Defined Benefit [Member]
Defined Benefit Plan Assumptions Used In Calculations [Line Items]
Discount rate - Benefit Obligation	5.51%	2.88%
Health care cost trend rate	5%	5%
Ultimate health care cost trend rate	5%	5%
Discount rate - Net Periodic Benefit Costs	3.20%	2.51%	3.31%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets	6.44%	6.46%	6.69%
Other Postretirement Benefit Plan, Defined Benefit [Member] \| CENG Legacy Benefit Plans [Member] \| Minimum [Member]
Defined Benefit Plan Assumptions Used In Calculations [Line Items]
Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Discount Rate Design Changes	5.49%	2.84%
Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Discount Rate Design Changes	2.84%	2.45%	3.27%
Other Postretirement Benefit Plan, Defined Benefit [Member] \| CENG Legacy Benefit Plans [Member] \| Maximum [Member]
Defined Benefit Plan Assumptions Used In Calculations [Line Items]
Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Discount Rate Design Changes	5.51%	2.92%
Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Discount Rate Design Changes	3.20%	2.63%	3.40%
Pension and other post retirement benefit [Member]
Defined Benefit Plan Assumptions Used In Calculations [Line Items]
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase	3.75%	3.75%	3.75%

Retirement Benefits - Contribut

Retirement Benefits - Contributions made to Pension and Other Postretirement Benefit Plans (Details) - USD ($) $ in Millions			12 Months Ended
	Mar. 02, 2022	Feb. 01, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Pension and non-pension postretirement benefit contributions			$ 616	$ 665	$ 601
Expected qualified pension plan contributions			20
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months			48
Defined Other Postretirement Benefit Plan Estimated Future Employer Contributions In Next Fiscal Year			47
Commonwealth Edison Co [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension and non-pension postretirement benefit contributions			184	196	148
Expected qualified pension plan contributions			20
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months			3
Defined Other Postretirement Benefit Plan Estimated Future Employer Contributions In Next Fiscal Year			19
PECO Energy Co [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension and non-pension postretirement benefit contributions			18	18	18
Expected qualified pension plan contributions			0
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months			1
Defined Other Postretirement Benefit Plan Estimated Future Employer Contributions In Next Fiscal Year			0
Baltimore Gas and Electric Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension and non-pension postretirement benefit contributions			68	81	78
Expected qualified pension plan contributions			0
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months			1
Defined Other Postretirement Benefit Plan Estimated Future Employer Contributions In Next Fiscal Year			15
Pepco Holdings LLC [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension and non-pension postretirement benefit contributions			78	48	39
Expected qualified pension plan contributions			0
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months			9
Defined Other Postretirement Benefit Plan Estimated Future Employer Contributions In Next Fiscal Year			11
Potomac Electric Power Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension and non-pension postretirement benefit contributions			11	11	11
Expected qualified pension plan contributions			0
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months			1
Defined Other Postretirement Benefit Plan Estimated Future Employer Contributions In Next Fiscal Year			11
Delmarva Power & Light Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension and non-pension postretirement benefit contributions			1	1	0
Expected qualified pension plan contributions			0
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months			0
Defined Other Postretirement Benefit Plan Estimated Future Employer Contributions In Next Fiscal Year			0
Atlantic City Electric Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension and non-pension postretirement benefit contributions			7	3	2
Expected qualified pension plan contributions			0
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months			0
Defined Other Postretirement Benefit Plan Estimated Future Employer Contributions In Next Fiscal Year			0
Pension Plan, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension and non-pension postretirement benefit contributions	$ 33	$ 207	570	343	306
Pension Plan, Defined Benefit [Member] \| Commonwealth Edison Co [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension and non-pension postretirement benefit contributions			176	174	143
Pension Plan, Defined Benefit [Member] \| PECO Energy Co [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension and non-pension postretirement benefit contributions			15	17	18
Pension Plan, Defined Benefit [Member] \| Baltimore Gas and Electric Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension and non-pension postretirement benefit contributions			48	57	56
Pension Plan, Defined Benefit [Member] \| Pepco Holdings LLC [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension and non-pension postretirement benefit contributions			69	39	30
Pension Plan, Defined Benefit [Member] \| Potomac Electric Power Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension and non-pension postretirement benefit contributions			3	2	2
Pension Plan, Defined Benefit [Member] \| Delmarva Power & Light Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension and non-pension postretirement benefit contributions			1	1	0
Pension Plan, Defined Benefit [Member] \| Atlantic City Electric Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension and non-pension postretirement benefit contributions			7	3	2
Other Postretirement Benefit Plan, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension and non-pension postretirement benefit contributions			42	63	40
Other Postretirement Benefit Plan, Defined Benefit [Member] \| Commonwealth Edison Co [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension and non-pension postretirement benefit contributions			8	22	5
Other Postretirement Benefit Plan, Defined Benefit [Member] \| PECO Energy Co [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension and non-pension postretirement benefit contributions			3	1	0
Other Postretirement Benefit Plan, Defined Benefit [Member] \| Baltimore Gas and Electric Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension and non-pension postretirement benefit contributions			20	24	22
Other Postretirement Benefit Plan, Defined Benefit [Member] \| Pepco Holdings LLC [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension and non-pension postretirement benefit contributions			9	9	9
Other Postretirement Benefit Plan, Defined Benefit [Member] \| Potomac Electric Power Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension and non-pension postretirement benefit contributions			8	9	9
Other Postretirement Benefit Plan, Defined Benefit [Member] \| Delmarva Power & Light Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension and non-pension postretirement benefit contributions			0	0	0
Other Postretirement Benefit Plan, Defined Benefit [Member] \| Atlantic City Electric Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension and non-pension postretirement benefit contributions			$ 0	$ 0	$ 0

Retirement Benefits - Estimated

Retirement Benefits - Estimated Future Benefit Payments (Details) $ in Millions	Dec. 31, 2022 USD ($)
Pension Plan, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
2023	$ 805
2024	775
2025	789
2026	790
2027	798
2028 through 2032	3,983
Total estimated future benefits payments through 2032	7,940
Other Postretirement Benefit Plan, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
2023	152
2024	152
2025	152
2026	152
2027	153
2028 through 2032	744
Total estimated future benefits payments through 2032	$ 1,505

Retirement Benefits - Pension a

Retirement Benefits - Pension and Other Postretirement Benefit Plan Target Asset Allocations (Details)	Dec. 31, 2022	Dec. 31, 2021
Pension Plan, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Target asset allocation percentage	100%	100%
Pension Plan, Defined Benefit [Member] \| Equity Securities [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Target asset allocation percentage	28%	35%
Pension Plan, Defined Benefit [Member] \| Fixed Income Securities [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Target asset allocation percentage	44%	41%
Pension Plan, Defined Benefit [Member] \| Alternative Investments [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Target asset allocation percentage	28%	24%
Other Postretirement Benefit Plan, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Target asset allocation percentage	100%	100%
Other Postretirement Benefit Plan, Defined Benefit [Member] \| Equity Securities [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Target asset allocation percentage	44%	44%
Other Postretirement Benefit Plan, Defined Benefit [Member] \| Fixed Income Securities [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Target asset allocation percentage	41%	41%
Other Postretirement Benefit Plan, Defined Benefit [Member] \| Alternative Investments [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Target asset allocation percentage	15%	15%

Retirement Benefits - Fair Valu

Retirement Benefits - Fair Value Measurements of Pension and Postretirement Benefit Plan Assets (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Derivative, Fair Value, Net	$ 11	$ (2)
Derivative, Notional Amount	3,434	3,481
Net liabilities pending transactions excluded	318	(131)
Pension Plan, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Amount	9,521	12,165	$ 11,883
Financial Instruments Sold, Not yet Purchased, Corporate Debt		(44)
Pension Plan, Defined Benefit [Member] \| Fair Value, Recurring [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Amount	9,840	12,306
Pension Plan, Defined Benefit [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Amount	2,634	4,004
Pension Plan, Defined Benefit [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Amount	2,260	2,998
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Other Postretirement Benefits Plan [Member] \| Fair Value, Recurring [Member] \| Hedge Funds [Member] \| Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Other Postretirement Benefits Plan [Member] \| Fair Value, Recurring [Member] \| Hedge Funds [Member] \| Fair Value Measured at Net Asset Value Per Share [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Amount	120	175
Other Postretirement Benefits Plan [Member] \| Fair Value, Recurring [Member] \| Real Estate Funds [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Amount	106	86
Other Postretirement Benefits Plan [Member] \| Fair Value, Recurring [Member] \| Real Estate Funds [Member] \| Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Other Postretirement Benefits Plan [Member] \| Fair Value, Recurring [Member] \| Real Estate Funds [Member] \| Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Other Postretirement Benefits Plan [Member] \| Fair Value, Recurring [Member] \| Real Estate Funds [Member] \| Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Other Postretirement Benefits Plan [Member] \| Fair Value, Recurring [Member] \| Real Estate Funds [Member] \| Fair Value Measured at Net Asset Value Per Share [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Amount	106	86
Other Postretirement Benefits Plan [Member] \| Fair Value, Recurring [Member] \| Private Placement [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Amount	39	84
Other Postretirement Benefits Plan [Member] \| Fair Value, Recurring [Member] \| Private Placement [Member] \| Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Other Postretirement Benefits Plan [Member] \| Fair Value, Recurring [Member] \| Private Placement [Member] \| Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Other Postretirement Benefits Plan [Member] \| Fair Value, Recurring [Member] \| Private Placement [Member] \| Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Other Postretirement Benefits Plan [Member] \| Fair Value, Recurring [Member] \| Private Placement [Member] \| Fair Value Measured at Net Asset Value Per Share [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Amount	39	84
Pension and other post retirement benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Derivative, Notional Amount	69	127
Pension and other post retirement benefit [Member] \| Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Amount	12	469	485
Pension and other post retirement benefit [Member] \| Equity Securities [Member] \| Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	2	1
Pension and other post retirement benefit [Member] \| Debt Securities [Member] \| Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Amount	12	337	348
Pension and other post retirement benefit [Member] \| Private Placement [Member] \| Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	130	$ 136
Pension and other post retirement benefit [Member] \| Fair Value, Recurring [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Amount	11,190	13,961
Pension and other post retirement benefit [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Amount	3,156	4,682
Pension and other post retirement benefit [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Amount	2,363	3,170
Pension and other post retirement benefit [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Amount	12	469
Pension and other post retirement benefit [Member] \| Fair Value, Recurring [Member] \| Fair Value Measured at Net Asset Value Per Share [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Amount	$ 5,659	$ 5,640

Retirement Benefits - Reconcili

Retirement Benefits - Reconciliation of Level 3 Assets and Liabilities measured at Fair Value for Pension and Other Postretirement Benefit Plans (Details) - Pension and other post retirement benefit [Member] - Fair Value, Inputs, Level 3 [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of net plan assets as of the beginning of year	$ 469	$ 485
Relating to assets still held at the reporting date	(24)	6
Relating to assets sold during the period	(6)
Defined Benefit Plan Purchases	7	15
Settlements	(53)	(42)
Transfers into (out of) Level 3	(381)	5
Fair value of net plan assets as of the end of year	12	469
Debt Securities [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of net plan assets as of the beginning of year	337	348
Relating to assets still held at the reporting date	(9)	(12)
Relating to assets sold during the period	(19)
Defined Benefit Plan Purchases	0	10
Settlements	(1)	(13)
Transfers into (out of) Level 3	(296)	4
Fair value of net plan assets as of the end of year	12	337
Equity Securities [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of net plan assets as of the beginning of year	2	1
Relating to assets still held at the reporting date	0	0
Defined Benefit Plan Purchases	0	0
Settlements	0	0
Transfers into (out of) Level 3	(2)	1
Fair value of net plan assets as of the end of year	0	2
Equity Security Individually Held [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Relating to assets sold during the period	0
Private Placement [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of net plan assets as of the beginning of year	130	136
Relating to assets still held at the reporting date	(15)	18
Relating to assets sold during the period	13
Defined Benefit Plan Purchases	7	5
Settlements	(52)	(29)
Transfers into (out of) Level 3	(83)	0
Fair value of net plan assets as of the end of year	$ 0	$ 130

Retirement Benefits - Defined C

Retirement Benefits - Defined Contribution Savings Plan (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Savings plan matching contributions	$ 91	$ 90	$ 95
Commonwealth Edison Co [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Savings plan matching contributions	39	35	36
PECO Energy Co [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Savings plan matching contributions	13	12	12
Baltimore Gas and Electric Company [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Savings plan matching contributions	11	12	13
Pepco Holdings LLC [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Savings plan matching contributions	14	14	14
Potomac Electric Power Company [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Savings plan matching contributions	4	4	4
Delmarva Power & Light Company [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Savings plan matching contributions	3	3	3
Atlantic City Electric Company [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Savings plan matching contributions	$ 2	$ 2	$ 3

Derivative Financial Instrume_3

Derivative Financial Instruments - Narrative (Details) MWh in Millions, $ in Millions	1 Months Ended
	Jun. 30, 2012 MWh	Feb. 14, 2023 USD ($)	Jan. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Derivative [Line Items]
Derivative, Notional Amount				$ 3,434	$ 3,481
Accumulated other comprehensive loss, net				(638)	(2,750)
Other				1,155	766
Commonwealth Edison Co [Member]
Derivative [Line Items]
Long-term Purchase Commitment, Minimum Energy Volume Required \| MWh	1.3
Other				191	133
PECO Energy Co [Member]
Derivative [Line Items]
Other				32	35
Incremental collateral for loss of investment grade credit rating				71
Baltimore Gas and Electric Company [Member]
Derivative [Line Items]
Other				55	48
Incremental collateral for loss of investment grade credit rating				119
Pepco Holdings LLC [Member]
Derivative [Line Items]
Other				330	171
Potomac Electric Power Company [Member]
Derivative [Line Items]
Other				93	55
Delmarva Power & Light Company [Member]
Derivative [Line Items]
Other				136	59
Incremental collateral for loss of investment grade credit rating				15
Atlantic City Electric Company [Member]
Derivative [Line Items]
Other				58	12
InterestRateSwapNotional5YR \| Cash Flow Hedging
Derivative [Line Items]
Derivative, Notional Amount				635
InterestRateSwapNotional5YR \| Cash Flow Hedging \| Subsequent Event [Member]
Derivative [Line Items]
Derivative, Notional Amount			$ 115
InterestRateSwapNotional10YR \| Cash Flow Hedging
Derivative [Line Items]
Derivative, Notional Amount				635
InterestRateSwapNotional10YR \| Cash Flow Hedging \| Subsequent Event [Member]
Derivative [Line Items]
Derivative, Notional Amount			115
Interest Rate Swap [Member] \| Cash Flow Hedging
Derivative [Line Items]
Derivative, Notional Amount				1,270	0
Accumulated other comprehensive loss, net				2
Interest Rate Swap [Member] \| Cash Flow Hedging \| Subsequent Event [Member]
Derivative [Line Items]
Derivative, Notional Amount			230
InterestRateCap18month \| Not Designated as Hedging Instrument, Economic Hedge [Member]
Derivative [Line Items]
Derivative, Notional Amount				1,000
InterestRateCapNotional6month \| Not Designated as Hedging Instrument, Economic Hedge [Member]
Derivative [Line Items]
Derivative, Notional Amount				850
Interest Rate Cap \| Not Designated as Hedging Instrument, Economic Hedge [Member]
Derivative [Line Items]
Derivative, Notional Amount				1,850	0
Constant Maturity Treasury Interest Rate Swaps \| Not Designated as Hedging Instrument, Economic Hedge [Member]
Derivative [Line Items]
Derivative, Notional Amount				500	0
Constant Maturity Treasury Interest Rate Swaps \| Not Designated as Hedging Instrument, Economic Hedge [Member] \| Subsequent Event [Member]
Derivative [Line Items]
Derivative, Notional Amount		$ 1,500
Constant Maturity Treasury Interest Rate Swaps Through Report Date \| Not Designated as Hedging Instrument, Economic Hedge [Member] \| Subsequent Event [Member]
Derivative [Line Items]
Derivative, Notional Amount		$ 2,000
Commodity Contract [Member] \| External Counterparties \| Collateral [Member]
Derivative [Line Items]
Other				297
Commodity Contract [Member] \| Commonwealth Edison Co [Member] \| External Counterparties \| Collateral [Member]
Derivative [Line Items]
Other				77	41
Commodity Contract [Member] \| Baltimore Gas and Electric Company [Member] \| External Counterparties \| Collateral [Member]
Derivative [Line Items]
Other				23
Commodity Contract [Member] \| Pepco Holdings LLC [Member] \| External Counterparties \| Collateral [Member]
Derivative [Line Items]
Other				197
Commodity Contract [Member] \| Potomac Electric Power Company [Member] \| External Counterparties \| Collateral [Member]
Derivative [Line Items]
Other				26
Commodity Contract [Member] \| Delmarva Power & Light Company [Member] \| External Counterparties \| Collateral [Member]
Derivative [Line Items]
Other				121	$ 43
Commodity Contract [Member] \| Atlantic City Electric Company [Member] \| External Counterparties \| Collateral [Member]
Derivative [Line Items]
Other				$ 50
InterestRateSwap-Through Report Date \| Cash Flow Hedging \| Subsequent Event [Member]
Derivative [Line Items]
Derivative, Notional Amount			$ 1,500

Derivative Financial Instrume_4

Derivative Financial Instruments - Summary of Interest Rate Hedge Balances (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Derivative [Line Items]
Derivative Liability, Current	$ (8)	$ (18)
Derivative Liability, Noncurrent	(83)	(201)
Derivative, Fair Value, Net	11	$ (2)
Interest Rate Contract
Derivative [Line Items]
Derivative Asset, Noncurrent	11
Derivative Asset	11
Derivative Liability, Current	3
Derivative Liability, Noncurrent	4
Derivative Liability	7
Derivative, Fair Value, Net	4
Interest Rate Contract \| Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Asset, Noncurrent	6
Derivative Asset	6
Derivative Liability, Current	0
Derivative Liability, Noncurrent	4
Derivative Liability	4
Derivative, Fair Value, Net	2
Interest Rate Contract \| Not Designated as Hedging Instrument
Derivative [Line Items]
Derivative Asset, Noncurrent	5
Derivative Asset	5
Derivative Liability, Current	3
Derivative Liability, Noncurrent	0
Derivative Liability	3
Derivative, Fair Value, Net	$ 2

Derivative Financial Instrume_5

Derivative Financial Instruments - Summary of Economic Hedges (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Derivative [Line Items]
Unrealized Gain (Loss) on Derivatives	$ 53	$ 568	$ 268
Interest Rate Cap \| Not Designated as Hedging Instrument, Economic Hedge [Member]
Derivative [Line Items]
Unrealized Gain (Loss) on Derivatives	5
Interest Rate Cap \| Electric Operating Revenues [Member] \| Not Designated as Hedging Instrument, Economic Hedge [Member]
Derivative [Line Items]
Unrealized Gain (Loss) on Derivatives	2
Interest Rate Cap \| Interest Expense \| Not Designated as Hedging Instrument, Economic Hedge [Member]
Derivative [Line Items]
Unrealized Gain (Loss) on Derivatives	$ 3

Debt and Credit Agreements - Na

Debt and Credit Agreements - Narrative (Details) - USD ($) $ in Millions				12 Months Ended
	Oct. 11, 2022	Aug. 11, 2022	Jan. 24, 2022	Dec. 31, 2022	Oct. 07, 2022	Jan. 31, 2022	Dec. 31, 2021
Short-term Loan Agreements [Abstract]
Proceeds from (Repayments of) Debt		$ 575
Long-term Debt, Current Maturities				$ 1,802			$ 2,153
Corporate, Non-Segment [Member]
Short-term Loan Agreements [Abstract]
Proceeds from (Repayments of) Debt	$ 575	$ 575
Long-term Debt, Current Maturities				850			1,150
Notes Receivable, Related Parties							319
Due from Affiliate, Noncurrent				0			319
Corporate, Non-Segment [Member] \| ShortTermDebt03232017 [Member]
Short-term Loan Agreements [Abstract]
Short-Term Loans				$ 500
Corporate, Non-Segment [Member] \| ShortTermDebt03232017 [Member] \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Short-term Loan Agreements [Abstract]
Short-Term Loans, Interest rate terms				0.65
Corporate, Non-Segment [Member] \| ShortTermDebt03312021.1 [Member]
Short-term Loan Agreements [Abstract]
Short-Term Loans				$ 150
Corporate, Non-Segment [Member] \| ShortTermDebt03312021.1 [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Short-term Loan Agreements [Abstract]
Short-Term Loans, Interest rate terms				0.65
Corporate, Non-Segment [Member] \| ShortTermDebt03312021.2 [Member]
Short-term Loan Agreements [Abstract]
Short-Term Loans				$ 150
Corporate, Non-Segment [Member] \| ShortTermDebt03312021.2 [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Short-term Loan Agreements [Abstract]
Short-Term Loans, Interest rate terms				0.65
Corporate, Non-Segment [Member] \| ShortTermDebt01242022
Short-term Loan Agreements [Abstract]
Short-Term Loans			$ 1,150
Corporate, Non-Segment [Member] \| ShortTermDebt01242022 \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Short-term Loan Agreements [Abstract]
Short-Term Loans, Interest rate terms			0.75
Corporate, Non-Segment [Member] \| ShortTermDebtSOFRplus075PLUS22.5BPincreaseJan2023 \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Short-term Loan Agreements [Abstract]
Short-Term Loans, Interest rate terms				0.975
Corporate, Non-Segment [Member] \| CorpTermLoanApr2024 \| Notes Payable to Banks
Short-term Loan Agreements [Abstract]
Debt Instrument, Face Amount					$ 500
Exelon Corporate [Member] \| Exelon Generation Co L L C [Member]
Short-term Loan Agreements [Abstract]
Due from Affiliate, Noncurrent				$ 0		$ 258	319
Commonwealth Edison Co [Member] \| ShortTermDebtSOFRplus075Oct2023
Short-term Loan Agreements [Abstract]
Short-Term Loans				$ 150
Commonwealth Edison Co [Member] \| ShortTermDebtSOFRplus075Oct2023 \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Short-term Loan Agreements [Abstract]
Short-Term Loans, Interest rate terms				0.75
Delmarva Power & Light Company [Member]
Short-term Loan Agreements [Abstract]
Long-term Debt, Current Maturities				$ 79			$ 79

Debt and Credit Agreements - Co

Debt and Credit Agreements - Commercial Paper Borrowings (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 23, 2022	Feb. 01, 2022	Jan. 31, 2022	Dec. 31, 2021
Commercial Paper
Short-term Debt [Line Items]
Line of credit facility, maximum borrowing capacity	$ 4,000				$ 3,700
Commercial Paper	$ 1,938				$ 599
Average interest rate on commercial paper borrowings	4.77%				0.35%
Revolving Credit Facility [Member]
Short-term Debt [Line Items]
Line of credit facility, maximum borrowing capacity	$ 4,000
Line of credit facility, remaining borrowing capacity	3,992
Corporate, Non-Segment [Member] \| Commercial Paper
Short-term Debt [Line Items]
Line of credit facility, maximum borrowing capacity	900				$ 600
Commercial Paper	449				0
Corporate, Non-Segment [Member] \| Revolving Credit Facility [Member]
Short-term Debt [Line Items]
Line of credit facility, maximum borrowing capacity	900		$ 900	$ 600
Line of credit facility, remaining borrowing capacity	448
Commonwealth Edison Co [Member] \| Commercial Paper
Short-term Debt [Line Items]
Line of credit facility, maximum borrowing capacity	1,000				1,000
Commercial Paper	$ 427				$ 0
Average interest rate on commercial paper borrowings	4.71%				0%
Commonwealth Edison Co [Member] \| Revolving Credit Facility [Member]
Short-term Debt [Line Items]
Line of credit facility, maximum borrowing capacity	$ 1,000		1,000
Line of credit facility, remaining borrowing capacity	995
PECO Energy Co [Member] \| Commercial Paper
Short-term Debt [Line Items]
Line of credit facility, maximum borrowing capacity	600				$ 600
Commercial Paper	$ 239				$ 0
Average interest rate on commercial paper borrowings	4.71%				0%
PECO Energy Co [Member] \| Revolving Credit Facility [Member]
Short-term Debt [Line Items]
Line of credit facility, maximum borrowing capacity	$ 600		600
Line of credit facility, remaining borrowing capacity	600
Baltimore Gas and Electric Company [Member] \| Commercial Paper
Short-term Debt [Line Items]
Line of credit facility, maximum borrowing capacity	600				$ 600
Commercial Paper	$ 409				$ 130
Average interest rate on commercial paper borrowings	4.81%				0.37%
Baltimore Gas and Electric Company [Member] \| Revolving Credit Facility [Member]
Short-term Debt [Line Items]
Line of credit facility, maximum borrowing capacity	$ 600		600
Line of credit facility, remaining borrowing capacity	600
Pepco Holdings LLC [Member] \| Commercial Paper
Short-term Debt [Line Items]
Line of credit facility, maximum borrowing capacity	900				$ 900
Commercial Paper	$ 414				$ 469
Average interest rate on commercial paper borrowings	4.78%				0.35%
Pepco Holdings LLC [Member] \| Revolving Credit Facility [Member]
Short-term Debt [Line Items]
Line of credit facility, maximum borrowing capacity	$ 900
Line of credit facility, remaining borrowing capacity	900
Potomac Electric Power Company [Member] \| Commercial Paper
Short-term Debt [Line Items]
Line of credit facility, maximum borrowing capacity	300	$ 400			$ 300
Commercial Paper	$ 299				$ 175
Average interest rate on commercial paper borrowings	4.79%				0.33%
Line of credit facility, remaining borrowing capacity	$ 500
Potomac Electric Power Company [Member] \| Revolving Credit Facility [Member]
Short-term Debt [Line Items]
Line of credit facility, maximum borrowing capacity	300		300
Line of credit facility, remaining borrowing capacity	300
Delmarva Power & Light Company [Member] \| Commercial Paper
Short-term Debt [Line Items]
Line of credit facility, maximum borrowing capacity	300				$ 300
Commercial Paper	$ 115				$ 149
Average interest rate on commercial paper borrowings	4.76%				0.36%
Line of credit facility, remaining borrowing capacity	$ 500
Delmarva Power & Light Company [Member] \| Revolving Credit Facility [Member]
Short-term Debt [Line Items]
Line of credit facility, maximum borrowing capacity	300		300
Line of credit facility, remaining borrowing capacity	300
Atlantic City Electric Company [Member] \| Commercial Paper
Short-term Debt [Line Items]
Line of credit facility, maximum borrowing capacity	300	250			$ 300
Commercial Paper	$ 0				$ 145
Average interest rate on commercial paper borrowings	0%				0.35%
Line of credit facility, remaining borrowing capacity	$ 350
Atlantic City Electric Company [Member] \| Revolving Credit Facility [Member]
Short-term Debt [Line Items]
Line of credit facility, maximum borrowing capacity	300		$ 300
Line of credit facility, remaining borrowing capacity	$ 300
Delmarva Power & Light Co \| Commercial Paper
Short-term Debt [Line Items]
Line of credit facility, maximum borrowing capacity		$ 250

Debt and Credit Agreements - Su

Debt and Credit Agreements - Summary of Bank Commitments, Credit Facility Borrowings and Available Capacity (Details) - Revolving Credit Facility [Member] - USD ($) $ in Millions	Dec. 31, 2022	Feb. 01, 2022	Jan. 31, 2022
Short-term Debt [Line Items]
Line of credit facility, maximum borrowing capacity	$ 4,000
Long-term line of credit/facility draws	0
Outstanding letters of credit	8
Actual available capacity	3,992
To support additional commercial paper	2,054
Corporate, Non-Segment [Member]
Short-term Debt [Line Items]
Line of credit facility, maximum borrowing capacity	900	$ 900	$ 600
Outstanding letters of credit	3
Actual available capacity	448
Commonwealth Edison Co [Member]
Short-term Debt [Line Items]
Line of credit facility, maximum borrowing capacity	1,000	1,000
Long-term line of credit/facility draws	0
Outstanding letters of credit	5
Actual available capacity	995
To support additional commercial paper	568
PECO Energy Co [Member]
Short-term Debt [Line Items]
Line of credit facility, maximum borrowing capacity	600	600
Long-term line of credit/facility draws	0
Outstanding letters of credit	0
Actual available capacity	600
To support additional commercial paper	361
Baltimore Gas and Electric Company [Member]
Short-term Debt [Line Items]
Line of credit facility, maximum borrowing capacity	600	600
Long-term line of credit/facility draws	0
Outstanding letters of credit	0
Actual available capacity	600
To support additional commercial paper	191
Pepco Holdings LLC [Member]
Short-term Debt [Line Items]
Line of credit facility, maximum borrowing capacity	900
Long-term line of credit/facility draws	0
Outstanding letters of credit	0
Actual available capacity	900
To support additional commercial paper	486
Potomac Electric Power Company [Member]
Short-term Debt [Line Items]
Line of credit facility, maximum borrowing capacity	300	300
Long-term line of credit/facility draws	0
Outstanding letters of credit	0
Actual available capacity	300
To support additional commercial paper	1
Delmarva Power & Light Company [Member]
Short-term Debt [Line Items]
Line of credit facility, maximum borrowing capacity	300	300
Long-term line of credit/facility draws	0
Outstanding letters of credit	0
Actual available capacity	300
To support additional commercial paper	185
Atlantic City Electric Company [Member]
Short-term Debt [Line Items]
Line of credit facility, maximum borrowing capacity	300	$ 300
Long-term line of credit/facility draws	0
Outstanding letters of credit	0
Actual available capacity	300
To support additional commercial paper	$ 300

Debt and Credit Agreements - _2

Debt and Credit Agreements - Summary of Credit Facility Agreements at Minority and Community Banks (Details) - Community and Minority Facilities [Member] - Community and Minority Facilities [Member] - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Short-term Debt [Line Items]
Line of credit facility, current borrowing capacity	$ 140	$ 98
Letters of Credit Outstanding, Amount	10	8
Commonwealth Edison Co [Member]
Short-term Debt [Line Items]
Line of credit facility, current borrowing capacity	40	33
Letters of Credit Outstanding, Amount	7	5
PECO Energy Co [Member]
Short-term Debt [Line Items]
Line of credit facility, current borrowing capacity	40	33
Letters of Credit Outstanding, Amount	1	1
Baltimore Gas and Electric Company [Member]
Short-term Debt [Line Items]
Line of credit facility, current borrowing capacity	15	8
Letters of Credit Outstanding, Amount	2	2
Pepco Holdings LLC [Member]
Short-term Debt [Line Items]
Line of credit facility, current borrowing capacity	45	24
Letters of Credit Outstanding, Amount	0	0
Potomac Electric Power Company [Member]
Short-term Debt [Line Items]
Line of credit facility, current borrowing capacity	15	8
Letters of Credit Outstanding, Amount	0	0
Delmarva Power & Light Company [Member]
Short-term Debt [Line Items]
Line of credit facility, current borrowing capacity	15	8
Letters of Credit Outstanding, Amount	0	0
Atlantic City Electric Company [Member]
Short-term Debt [Line Items]
Line of credit facility, current borrowing capacity	15	8
Letters of Credit Outstanding, Amount	$ 0	$ 0

Debt and Credit Agreements - _3

Debt and Credit Agreements - Summary of Revolving Credit Agreements (Details) - USD ($) $ in Millions	Dec. 31, 2022	Feb. 01, 2022	Jan. 31, 2022	Dec. 31, 2021
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 4,000
Letters of Credit Outstanding, Amount	8
Revolving Credit Facility [Member] \| Commonwealth Edison Co [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	1,000	$ 1,000
Letters of Credit Outstanding, Amount	5
Revolving Credit Facility [Member] \| Commonwealth Edison Co [Member] \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Line of Credit Facility [Line Items]
Line of credit facility, interest rate at period end		1%
Revolving Credit Facility [Member] \| PECO Energy Co [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	600	$ 600
Letters of Credit Outstanding, Amount	0
Revolving Credit Facility [Member] \| PECO Energy Co [Member] \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Line of Credit Facility [Line Items]
Line of credit facility, interest rate at period end		0.90%
Revolving Credit Facility [Member] \| Baltimore Gas and Electric Company [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	600	$ 600
Letters of Credit Outstanding, Amount	0
Revolving Credit Facility [Member] \| Baltimore Gas and Electric Company [Member] \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Line of Credit Facility [Line Items]
Line of credit facility, interest rate at period end		0.90%
Revolving Credit Facility [Member] \| Potomac Electric Power Company [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	300	$ 300
Letters of Credit Outstanding, Amount	0
Revolving Credit Facility [Member] \| Potomac Electric Power Company [Member] \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Line of Credit Facility [Line Items]
Line of credit facility, interest rate at period end		1.075%
Revolving Credit Facility [Member] \| Delmarva Power & Light Company [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	300	$ 300
Letters of Credit Outstanding, Amount	0
Revolving Credit Facility [Member] \| Delmarva Power & Light Company [Member] \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Line of Credit Facility [Line Items]
Line of credit facility, interest rate at period end		1%
Revolving Credit Facility [Member] \| Atlantic City Electric Company [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	300	$ 300
Letters of Credit Outstanding, Amount	0
Revolving Credit Facility [Member] \| Atlantic City Electric Company [Member] \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Line of Credit Facility [Line Items]
Line of credit facility, interest rate at period end		1.075%
Revolving Credit Facility [Member] \| Pepco Holdings LLC [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	900
Letters of Credit Outstanding, Amount	0
Community and Minority Facilities [Member] \| Community and Minority Facilities [Member]
Line of Credit Facility [Line Items]
Line of credit facility, current borrowing capacity	140			$ 98
Letters of Credit Outstanding, Amount	10			8
Community and Minority Facilities [Member] \| Commonwealth Edison Co [Member] \| Community and Minority Facilities [Member]
Line of Credit Facility [Line Items]
Line of credit facility, current borrowing capacity	40			33
Letters of Credit Outstanding, Amount	7			5
Community and Minority Facilities [Member] \| PECO Energy Co [Member] \| Community and Minority Facilities [Member]
Line of Credit Facility [Line Items]
Line of credit facility, current borrowing capacity	40			33
Letters of Credit Outstanding, Amount	1			1
Community and Minority Facilities [Member] \| Baltimore Gas and Electric Company [Member] \| Community and Minority Facilities [Member]
Line of Credit Facility [Line Items]
Line of credit facility, current borrowing capacity	15			8
Letters of Credit Outstanding, Amount	2			2
Community and Minority Facilities [Member] \| Potomac Electric Power Company [Member] \| Community and Minority Facilities [Member]
Line of Credit Facility [Line Items]
Line of credit facility, current borrowing capacity	15			8
Letters of Credit Outstanding, Amount	0			0
Community and Minority Facilities [Member] \| Delmarva Power & Light Company [Member] \| Community and Minority Facilities [Member]
Line of Credit Facility [Line Items]
Line of credit facility, current borrowing capacity	15			8
Letters of Credit Outstanding, Amount	0			0
Community and Minority Facilities [Member] \| Atlantic City Electric Company [Member] \| Community and Minority Facilities [Member]
Line of Credit Facility [Line Items]
Line of credit facility, current borrowing capacity	15			8
Letters of Credit Outstanding, Amount	0			0
Community and Minority Facilities [Member] \| Pepco Holdings LLC [Member] \| Community and Minority Facilities [Member]
Line of Credit Facility [Line Items]
Line of credit facility, current borrowing capacity	45			24
Letters of Credit Outstanding, Amount	0			$ 0
Corporate, Non-Segment [Member] \| Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	900	$ 900	$ 600
Letters of Credit Outstanding, Amount	$ 3
Corporate, Non-Segment [Member] \| Revolving Credit Facility [Member] \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Line of Credit Facility [Line Items]
Line of credit facility, interest rate at period end		1.275%

Debt and Credit Agreements - _4

Debt and Credit Agreements - Summary of Basis Spread (Details)	12 Months Ended
	Dec. 31, 2022
Prime Rate [Member] \| Corporate, Non-Segment [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate	0.275%
Prime Rate [Member] \| Minimum [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate	0%
Prime Rate [Member] \| Maximum [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate	0.275%
Prime Rate [Member] \| Maximum [Member] \| External Credit Rating, Non Investment Grade
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate	0.65%
London Interbank Offered Rate (LIBOR) [Member] \| Minimum [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate	0.90%
London Interbank Offered Rate (LIBOR) [Member] \| Maximum [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.275%
London Interbank Offered Rate (LIBOR) [Member] \| Maximum [Member] \| External Credit Rating, Non Investment Grade
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.65%
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate \| Corporate, Non-Segment [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.275%
Commonwealth Edison Co [Member] \| Prime Rate [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate	0%
Commonwealth Edison Co [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1%
PECO Energy Co [Member] \| Prime Rate [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate	0%
PECO Energy Co [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate	0.90%
Baltimore Gas and Electric Company [Member] \| Prime Rate [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate	0%
Baltimore Gas and Electric Company [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate	0.90%
Potomac Electric Power Company [Member] \| Prime Rate [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate	0.075%
Potomac Electric Power Company [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.075%
Delmarva Power & Light Company [Member] \| Prime Rate [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate	0%
Delmarva Power & Light Company [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1%
Atlantic City Electric Company [Member] \| Prime Rate [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate	0.075%
Atlantic City Electric Company [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.075%

Debt and Credit Agreements - _5

Debt and Credit Agreements - Summary of Outstanding Long-term Debt (Details) - USD ($) $ in Millions	Jan. 24, 2022	Jan. 21, 2022	Jan. 10, 2023	Dec. 31, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Long-term debt, gross				$ 36,779	$ 32,523
Unamortized debt discount and premium, net				(74)	(70)
Unamortized debt issuance costs				(257)	(220)
Fair value adjustment				626	669
Long-term Debt, Current Maturities				(1,802)	(2,153)
Long-term Debt, Excluding Current Maturities				35,272	30,749
Long-term debt to financing trusts				390	390
Corporate, Non-Segment [Member]
Debt Instrument [Line Items]
Long-term debt, gross				9,489	7,289
Unamortized debt discount and premium, net				10	10
Unamortized debt issuance costs				(51)	(39)
Fair value adjustment				164	175
Long-term Debt, Current Maturities				(850)	(1,150)
Long-term Debt, Excluding Current Maturities				8,742	6,265
First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Long-term debt, gross				$ 22,651	20,751
First Mortgage Bonds [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				1.05%
Long-term Debt, Maturity Date				Dec. 31, 2023
First Mortgage Bonds [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				7.90%
Long-term Debt, Maturity Date				Dec. 31, 2052
Senior unsecured notes [Member]
Debt Instrument [Line Items]
Long-term debt, gross				$ 8,324	6,324
Senior unsecured notes [Member] \| Corporate, Non-Segment [Member]
Debt Instrument [Line Items]
Long-term debt, gross				$ 8,139	6,139
Senior unsecured notes [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				2.75%
Long-term Debt, Maturity Date				Dec. 31, 2025
Senior unsecured notes [Member] \| Minimum [Member] \| Corporate, Non-Segment [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				2.75%
Long-term Debt, Maturity Date				Dec. 31, 2025
Senior unsecured notes [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				7.60%
Long-term Debt, Maturity Date				Dec. 31, 2052
Senior unsecured notes [Member] \| Maximum [Member] \| Corporate, Non-Segment [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				7.60%
Long-term Debt, Maturity Date				Dec. 31, 2052
Unsecured notes [Member]
Debt Instrument [Line Items]
Long-term debt, gross				$ 4,250	4,000
Unsecured notes [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				2.25%
Long-term Debt, Maturity Date				Dec. 31, 2023
Unsecured notes [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				6.35%
Long-term Debt, Maturity Date				Dec. 31, 2052
Notes payable and other [Member]
Debt Instrument [Line Items]
Long-term debt, gross				$ 86	86
Notes payable and other [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				1.64%
Long-term Debt, Maturity Date				Dec. 31, 2025
Notes payable and other [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				7.49%
Long-term Debt, Maturity Date				Dec. 31, 2053
Junior subordinated notes [Member]
Debt Instrument [Line Items]
Long-term debt, gross				$ 0	1,150
Junior subordinated notes [Member] \| Corporate, Non-Segment [Member]
Debt Instrument [Line Items]
Long-term debt, gross				$ 0	1,150
Junior subordinated notes [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				3.50%
Long-term Debt, Maturity Date				Dec. 31, 2022
Junior subordinated notes [Member] \| Maximum [Member] \| Corporate, Non-Segment [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				3.50%
Long-term Debt, Maturity Date				Dec. 31, 2022
Long-term software licensing agreement [Member]
Debt Instrument [Line Items]
Long-term debt, gross				$ 25	9
Long-term software licensing agreement [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				2.30%
Long-term Debt, Maturity Date				Dec. 31, 2024
Long-term software licensing agreement [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				3.95%
Long-term Debt, Maturity Date				Dec. 31, 2025
Unsecured tax-exempt bonds [Member]
Debt Instrument [Line Items]
Long-term debt, gross				$ 33	143
Unsecured tax-exempt bonds [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				4%
Long-term Debt, Maturity Date
Unsecured tax-exempt bonds [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				4.05%
Long-term Debt, Maturity Date				Dec. 31, 2024
Medium-term notes [Member]
Debt Instrument [Line Items]
Long-term debt, gross				$ 10	10
Medium-term notes [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				7.72%
Long-term Debt, Maturity Date				Dec. 31, 2027
Transition bonds [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Long-term Debt, Maturity Date
Loan agreement [Member]
Debt Instrument [Line Items]
Long-term debt, gross				$ 1,400	50
Loan agreement [Member] \| Corporate, Non-Segment [Member]
Debt Instrument [Line Items]
Long-term debt, gross		$ 300		$ 1,350	0
Loan agreement [Member] \| Corporate, Non-Segment [Member] \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Debt Instrument [Line Items]
Subordinated Borrowing, Interest Rate		0.65%
Loan agreement [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				2%
Long-term Debt, Maturity Date				Dec. 31, 2023
Loan agreement [Member] \| Minimum [Member] \| Corporate, Non-Segment [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				4.95%
Long-term Debt, Maturity Date				Dec. 31, 2023
Loan agreement [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				5.15%
Long-term Debt, Maturity Date				Dec. 31, 2024
Loan agreement [Member] \| Maximum [Member] \| Corporate, Non-Segment [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				5.15%
Long-term Debt, Maturity Date				Dec. 31, 2024
Long-term debt to financing trusts [Member]
Debt Instrument [Line Items]
Long-term debt to financing trusts				$ 390	390
Loans Payable Two \| Corporate, Non-Segment [Member] \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Debt Instrument [Line Items]
Subordinated Borrowing, Interest Rate		0.65%
Loans Payable Three \| Corporate, Non-Segment [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 250
Loans Payable Three \| Corporate, Non-Segment [Member] \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Debt Instrument [Line Items]
Subordinated Borrowing, Interest Rate	0.65%
ComEd Financing III Affiliate [Member]
Debt Instrument [Line Items]
Long-term debt to financing trusts				206	206
ComEd Financing III Affiliate [Member] \| Long-term debt to financing trusts [Member]
Debt Instrument [Line Items]
Long-term debt to financing trusts				$ 206	206
ComEd Financing III Affiliate [Member] \| Long-term debt to financing trusts [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				6.35%
Long-term Debt, Maturity Date				Dec. 31, 2033
PECO Trust III Affiliate [Member]
Debt Instrument [Line Items]
Long-term debt to financing trusts				$ 81	81
PECO Trust III Affiliate [Member] \| Long-term debt to financing trusts [Member]
Debt Instrument [Line Items]
Long-term debt to financing trusts				$ 81	81
PECO Trust III Affiliate [Member] \| Long-term debt to financing trusts [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				7.38%
PECO Trust III Affiliate [Member] \| Long-term debt to financing trusts [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				9.50%
Long-term Debt, Maturity Date				Dec. 31, 2028
PECO Trust IV Affiliate [Member]
Debt Instrument [Line Items]
Long-term debt to financing trusts				$ 103	103
PECO Trust IV Affiliate [Member] \| Long-term debt to financing trusts [Member]
Debt Instrument [Line Items]
Long-term debt to financing trusts				$ 103	103
PECO Trust IV Affiliate [Member] \| Long-term debt to financing trusts [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				5.75%
Long-term Debt, Maturity Date				Dec. 31, 2033
Commonwealth Edison Co [Member]
Debt Instrument [Line Items]
Long-term debt, gross				$ 10,637	9,887
Unamortized debt discount and premium, net				(27)	(27)
Unamortized debt issuance costs				(92)	(87)
Long-term Debt, Excluding Current Maturities				10,518	9,773
Long-term debt to financing trusts				205	205
Commonwealth Edison Co [Member] \| First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Long-term debt, gross				$ 10,629	9,879
Commonwealth Edison Co [Member] \| First Mortgage Bonds [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				2.20%
Long-term Debt, Maturity Date				Dec. 31, 2024
Commonwealth Edison Co [Member] \| First Mortgage Bonds [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				6.45%
Long-term Debt, Maturity Date				Dec. 31, 2052
Commonwealth Edison Co [Member] \| Notes payable and other [Member]
Debt Instrument [Line Items]
Finance lease, liability				$ 8	8
Commonwealth Edison Co [Member] \| Notes payable and other [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Long-term Debt, Maturity Date				Dec. 31, 2053
Lessee, finance lease, discount rate				7.49%
Commonwealth Edison Co [Member] \| Long-term debt to financing trusts [Member]
Debt Instrument [Line Items]
Long-term debt to financing trusts				$ 206	206
Commonwealth Edison Co [Member] \| First Mortgage Bonds \| Subsequent Event [Member] \| FMB490Feb2033
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage			4.90%
Commonwealth Edison Co [Member] \| First Mortgage Bonds \| Subsequent Event [Member] \| FMB530Feb2053
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage			5.30%
Commonwealth Edison Co [Member] \| First Mortgage \| Subsequent Event [Member] \| FMB490Feb2033
Debt Instrument [Line Items]
Debt Instrument, Face Amount			$ 400
Commonwealth Edison Co [Member] \| First Mortgage \| Subsequent Event [Member] \| FMB530Feb2053
Debt Instrument [Line Items]
Debt Instrument, Face Amount			$ 575
Commonwealth Edison Co [Member] \| ComEd Financing III Affiliate [Member]
Debt Instrument [Line Items]
Unamortized debt issuance costs				(1)	(1)
Long-term debt to financing trusts				205	205
Commonwealth Edison Co [Member] \| ComEd Financing III Affiliate [Member] \| Long-term debt to financing trusts [Member]
Debt Instrument [Line Items]
Long-term debt to financing trusts				$ 206	206
Commonwealth Edison Co [Member] \| ComEd Financing III Affiliate [Member] \| Long-term debt to financing trusts [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				6.35%
Commonwealth Edison Co [Member] \| PECO Trust III Affiliate [Member]
Debt Instrument [Line Items]
Long-term debt to financing trusts				$ 0	0
Commonwealth Edison Co [Member] \| PECO Trust IV Affiliate [Member]
Debt Instrument [Line Items]
Long-term debt to financing trusts				0	0
PECO Energy Co [Member]
Debt Instrument [Line Items]
Long-term debt, gross				4,675	4,250
Unamortized debt discount and premium, net				(24)	(20)
Unamortized debt issuance costs				(39)	(33)
Long-term Debt, Current Maturities				(50)	(350)
Long-term Debt, Excluding Current Maturities				4,562	3,847
Long-term debt to financing trusts				184	184
PECO Energy Co [Member] \| First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Long-term debt, gross				$ 4,625	4,200
PECO Energy Co [Member] \| First Mortgage Bonds [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				2.80%
Long-term Debt, Maturity Date				Dec. 31, 2025
PECO Energy Co [Member] \| First Mortgage Bonds [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				5.95%
Long-term Debt, Maturity Date				Dec. 31, 2052
PECO Energy Co [Member] \| Loan agreement [Member]
Debt Instrument [Line Items]
Long-term debt, gross				$ 50	50
PECO Energy Co [Member] \| Loan agreement [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				2%
Long-term Debt, Maturity Date				Dec. 31, 2023
PECO Energy Co [Member] \| ComEd Financing III Affiliate [Member]
Debt Instrument [Line Items]
Long-term debt to financing trusts				$ 0	0
PECO Energy Co [Member] \| PECO Trust III Affiliate [Member]
Debt Instrument [Line Items]
Long-term debt to financing trusts				81	81
PECO Energy Co [Member] \| PECO Trust III Affiliate [Member] \| Long-term debt to financing trusts [Member]
Debt Instrument [Line Items]
Long-term debt to financing trusts				$ 81	81
PECO Energy Co [Member] \| PECO Trust III Affiliate [Member] \| Long-term debt to financing trusts [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				7.38%
PECO Energy Co [Member] \| PECO Trust III Affiliate [Member] \| Long-term debt to financing trusts [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				9.50%
Long-term Debt, Maturity Date				Dec. 31, 2028
PECO Energy Co [Member] \| PECO Trust IV Affiliate [Member]
Debt Instrument [Line Items]
Long-term debt to financing trusts				$ 103	103
PECO Energy Co [Member] \| PECO Trust IV Affiliate [Member] \| Long-term debt to financing trusts [Member]
Debt Instrument [Line Items]
Long-term debt to financing trusts				$ 103	103
PECO Energy Co [Member] \| PECO Trust IV Affiliate [Member] \| Long-term debt to financing trusts [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				5.75%
Long-term Debt, Maturity Date				Dec. 31, 2033
Baltimore Gas and Electric Company [Member]
Debt Instrument [Line Items]
Long-term debt, gross				$ 4,250	4,000
Unamortized debt discount and premium, net				(13)	(12)
Unamortized debt issuance costs				(30)	(27)
Long-term Debt, Current Maturities				(300)	(250)
Long-term Debt, Excluding Current Maturities				3,907	3,711
Baltimore Gas and Electric Company [Member] \| Unsecured notes [Member]
Debt Instrument [Line Items]
Long-term debt, gross				$ 4,250	4,000
Baltimore Gas and Electric Company [Member] \| Unsecured notes [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				2.25%
Long-term Debt, Maturity Date				Dec. 31, 2023
Baltimore Gas and Electric Company [Member] \| Unsecured notes [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				6.35%
Long-term Debt, Maturity Date				Dec. 31, 2052
Pepco Holdings LLC [Member]
Debt Instrument [Line Items]
Long-term debt, gross				$ 7,701	7,084
Finance lease, liability				76	74
Unamortized debt discount and premium, net				4	4
Unamortized debt issuance costs				(47)	(36)
Fair value adjustment				462	495
Long-term debt due within one year				(591)	(399)
Long-term Debt, Excluding Current Maturities				7,529	7,148
Pepco Holdings LLC [Member] \| First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Long-term debt, gross				$ 7,397	6,672
Pepco Holdings LLC [Member] \| First Mortgage Bonds [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				1.05%
Long-term Debt, Maturity Date				Dec. 31, 2023
Pepco Holdings LLC [Member] \| First Mortgage Bonds [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				7.90%
Long-term Debt, Maturity Date				Dec. 31, 2052
Pepco Holdings LLC [Member] \| Senior unsecured notes [Member]
Debt Instrument [Line Items]
Long-term debt, gross				$ 185	185
Pepco Holdings LLC [Member] \| Senior unsecured notes [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				7.45%
Long-term Debt, Maturity Date				Dec. 31, 2032
Pepco Holdings LLC [Member] \| Finance Leases
Debt Instrument [Line Items]
Finance lease, liability				$ 76	74
Pepco Holdings LLC [Member] \| Finance Leases \| Minimum [Member]
Debt Instrument [Line Items]
Long-term Debt, Maturity Date				Dec. 31, 2025
Pepco Holdings LLC [Member] \| Finance Leases \| Maximum [Member]
Debt Instrument [Line Items]
Long-term Debt, Maturity Date				Dec. 31, 2030
Lessee, finance lease, discount rate				5.59%
Pepco Holdings LLC [Member] \| Notes payable and other [Member]
Debt Instrument [Line Items]
Long-term debt, gross				$ 0	0
Pepco Holdings LLC [Member] \| Notes payable and other [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				7.28%
Pepco Holdings LLC [Member] \| Notes payable and other [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				7.49%
Long-term Debt, Maturity Date				Dec. 31, 2022
Pepco Holdings LLC [Member] \| Unsecured tax-exempt bonds [Member]
Debt Instrument [Line Items]
Long-term debt, gross				$ 33	143
Pepco Holdings LLC [Member] \| Unsecured tax-exempt bonds [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				4%
Long-term Debt, Maturity Date
Pepco Holdings LLC [Member] \| Unsecured tax-exempt bonds [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				4.05%
Long-term Debt, Maturity Date				Dec. 31, 2024
Pepco Holdings LLC [Member] \| Medium-term notes [Member]
Debt Instrument [Line Items]
Long-term debt, gross				$ 10	10
Pepco Holdings LLC [Member] \| Medium-term notes [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				7.72%
Long-term Debt, Maturity Date				Dec. 31, 2027
Pepco Holdings LLC [Member] \| Transition bonds [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Long-term Debt, Maturity Date
Potomac Electric Power Company [Member]
Debt Instrument [Line Items]
Long-term debt, gross				$ 3,800	3,486
Finance lease, liability				25	26
Unamortized debt discount and premium, net				2	2
Unamortized debt issuance costs				(51)	(43)
Long-term debt due within one year				(4)	(313)
Long-term Debt, Excluding Current Maturities				3,747	3,132
Potomac Electric Power Company [Member] \| First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Long-term debt, gross				$ 3,775	3,350
Potomac Electric Power Company [Member] \| First Mortgage Bonds [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				2.32%
Long-term Debt, Maturity Date				Dec. 31, 2024
Potomac Electric Power Company [Member] \| First Mortgage Bonds [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				7.90%
Long-term Debt, Maturity Date				Dec. 31, 2052
Potomac Electric Power Company [Member] \| Finance Leases
Debt Instrument [Line Items]
Finance lease, liability				$ 25	26
Potomac Electric Power Company [Member] \| Finance Leases \| Minimum [Member]
Debt Instrument [Line Items]
Long-term Debt, Maturity Date				Dec. 31, 2025
Potomac Electric Power Company [Member] \| Finance Leases \| Maximum [Member]
Debt Instrument [Line Items]
Long-term Debt, Maturity Date				Dec. 31, 2029
Lessee, finance lease, discount rate				5.59%
Potomac Electric Power Company [Member] \| Notes payable and other [Member]
Debt Instrument [Line Items]
Long-term debt, gross				$ 0	0
Potomac Electric Power Company [Member] \| Notes payable and other [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				7.28%
Potomac Electric Power Company [Member] \| Notes payable and other [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				7.49%
Long-term Debt, Maturity Date				Dec. 31, 2022
Potomac Electric Power Company [Member] \| Unsecured tax-exempt bonds [Member]
Debt Instrument [Line Items]
Long-term debt, gross				$ 0	110
Potomac Electric Power Company [Member] \| Unsecured tax-exempt bonds [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				1.70%
Long-term Debt, Maturity Date				Dec. 31, 2022
Delmarva Power & Light Company [Member]
Debt Instrument [Line Items]
Long-term debt, gross				$ 1,949	1,821
Finance lease, liability				32	29
Unamortized debt discount and premium, net				0	0
Unamortized debt issuance costs				(11)	(11)
Long-term Debt, Current Maturities				(79)	(79)
Long-term debt due within one year				(584)	(83)
Long-term Debt, Excluding Current Maturities				1,354	1,727
Delmarva Power & Light Company [Member] \| First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Long-term debt, gross				$ 1,874	1,749
Delmarva Power & Light Company [Member] \| First Mortgage Bonds [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				1.05%
Long-term Debt, Maturity Date				Dec. 31, 2023
Delmarva Power & Light Company [Member] \| First Mortgage Bonds [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				4.27%
Long-term Debt, Maturity Date				Dec. 31, 2052
Delmarva Power & Light Company [Member] \| Finance Leases
Debt Instrument [Line Items]
Finance lease, liability				$ 32	29
Delmarva Power & Light Company [Member] \| Finance Leases \| Minimum [Member]
Debt Instrument [Line Items]
Long-term Debt, Maturity Date				Dec. 31, 2025
Delmarva Power & Light Company [Member] \| Finance Leases \| Maximum [Member]
Debt Instrument [Line Items]
Long-term Debt, Maturity Date				Dec. 31, 2030
Lessee, finance lease, discount rate				5.39%
Delmarva Power & Light Company [Member] \| Unsecured tax-exempt bonds [Member]
Debt Instrument [Line Items]
Long-term debt, gross				$ 33	33
Delmarva Power & Light Company [Member] \| Unsecured tax-exempt bonds [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				4%
Delmarva Power & Light Company [Member] \| Unsecured tax-exempt bonds [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				4.05%
Long-term Debt, Maturity Date				Dec. 31, 2024
Delmarva Power & Light Company [Member] \| Medium-term notes [Member]
Debt Instrument [Line Items]
Long-term debt, gross				$ 10	10
Delmarva Power & Light Company [Member] \| Medium-term notes [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				7.72%
Long-term Debt, Maturity Date				Dec. 31, 2027
Atlantic City Electric Company [Member]
Debt Instrument [Line Items]
Long-term debt, gross				$ 1,767	1,592
Finance lease, liability				19	19
Unamortized debt discount and premium, net				(1)	(1)
Unamortized debt issuance costs				(9)	(9)
Long-term debt due within one year				(3)	(3)
Long-term Debt, Excluding Current Maturities				1,754	1,579
Atlantic City Electric Company [Member] \| First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Long-term debt, gross				$ 1,748	1,573
Atlantic City Electric Company [Member] \| First Mortgage Bonds [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				2.25%
Long-term Debt, Maturity Date				Dec. 31, 2024
Atlantic City Electric Company [Member] \| First Mortgage Bonds [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				5.80%
Long-term Debt, Maturity Date				Dec. 31, 2052
Atlantic City Electric Company [Member] \| Finance Leases
Debt Instrument [Line Items]
Finance lease, liability				$ 19	$ 19
Atlantic City Electric Company [Member] \| Finance Leases \| Minimum [Member]
Debt Instrument [Line Items]
Long-term Debt, Maturity Date				Dec. 31, 2025
Atlantic City Electric Company [Member] \| Finance Leases \| Maximum [Member]
Debt Instrument [Line Items]
Long-term Debt, Maturity Date				Dec. 31, 2030
Lessee, finance lease, discount rate				5.59%
Atlantic City Electric Company [Member] \| Transition bonds [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Long-term Debt, Maturity Date				Dec. 31, 2021
Delmarva Power & Light Co \| Notes payable and other [Member]
Debt Instrument [Line Items]
Long-term debt, gross				$ 0

Debt and Credit Agreements - Sc

Debt and Credit Agreements - Schedule of Long-term Debt Maturities (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
2023	$ 1,802
2024	1,317
2025	1,414
2026	1,613
2027	1,021
Thereafter	30,002
Long-term Debt	37,169
Long-term debt to financing trusts	390	$ 390
Long-term debt to financing trusts [Member]
Debt Instrument [Line Items]
Long-term debt to financing trusts	390	390
ComEd Financing III Affiliate [Member]
Debt Instrument [Line Items]
Long-term debt to financing trusts	206	206
ComEd Financing III Affiliate [Member] \| Long-term debt to financing trusts [Member]
Debt Instrument [Line Items]
Long-term debt to financing trusts	206	206
Commonwealth Edison Co [Member]
Debt Instrument [Line Items]
2023	0
2024	250
2025	0
2026	500
2027	350
Thereafter	9,743
Long-term Debt	10,843
Long-term debt to financing trusts	205	205
Commonwealth Edison Co [Member] \| Long-term debt to financing trusts [Member]
Debt Instrument [Line Items]
Long-term debt to financing trusts	206	206
Commonwealth Edison Co [Member] \| ComEd Financing III Affiliate [Member]
Debt Instrument [Line Items]
Long-term debt to financing trusts	205	205
Commonwealth Edison Co [Member] \| ComEd Financing III Affiliate [Member] \| Long-term debt to financing trusts [Member]
Debt Instrument [Line Items]
Long-term debt to financing trusts	206	206
PECO Energy Co [Member]
Debt Instrument [Line Items]
2023	50
2024	0
2025	350
2026	0
2027	0
Thereafter	4,459
Long-term Debt	4,859
Long-term debt to financing trusts	184	184
PECO Energy Co [Member] \| ComEd Financing III Affiliate [Member]
Debt Instrument [Line Items]
Long-term debt to financing trusts	0	$ 0
PECO Energy Co [Member] \| PECO Financing Trusts [Member] \| Long-term debt to financing trusts [Member]
Debt Instrument [Line Items]
Long-term debt to financing trusts	184
Baltimore Gas and Electric Company [Member]
Debt Instrument [Line Items]
2023	300
2024	0
2025	0
2026	350
2027	0
Thereafter	3,600
Long-term Debt	4,250
Pepco Holdings LLC [Member]
Debt Instrument [Line Items]
2023	591
2024	564
2025	242
2026	13
2027	21
Thereafter	6,270
Long-term Debt	7,701
Potomac Electric Power Company [Member]
Debt Instrument [Line Items]
2023	4
2024	405
2025	5
2026	4
2027	3
Thereafter	3,379
Long-term Debt	3,800
Delmarva Power & Light Company [Member]
Debt Instrument [Line Items]
2023	584
2024	6
2025	84
2026	6
2027	15
Thereafter	1,254
Long-term Debt	1,949
Atlantic City Electric Company [Member]
Debt Instrument [Line Items]
2023	3
2024	153
2025	153
2026	3
2027	3
Thereafter	1,452
Long-term Debt	$ 1,767

Fair Value of Financial Asset_3

Fair Value of Financial Assets and Liabilities - Narrative (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative, Notional Amount	$ 3,434	$ 3,481
Interest Rate Swap [Member] \| Cash Flow Hedging
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative, Notional Amount	$ 1,270	$ 0

Fair Value of Financial Asset_4

Fair Value of Financial Assets and Liabilities - Fair Value of Financial Liabilities Recorded at Amortized Cost(Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Long-term debt (including amounts due within one year)	$ 626	$ 669
Long-term debt to financing trusts	390	390
Estimate of Fair Value Measurement [Member]
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Long-term debt (including amounts due within one year)	32,229	37,114
Long-term debt to financing trusts	384	470
Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 1 [Member]
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Long-term debt (including amounts due within one year)	0	0
Long-term debt to financing trusts	0	0
Spent Nuclear Fuel Obligation, Noncurrent	0	0
Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 2 [Member]
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Long-term debt (including amounts due within one year)	29,902	34,897
Long-term debt to financing trusts	0	0
Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 3 [Member]
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Long-term debt (including amounts due within one year)	2,327	2,217
Long-term debt to financing trusts	384	470
Reported Value Measurement [Member]
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Long-term debt (including amounts due within one year)	37,074	32,902
Long-term debt to financing trusts	390	390
Commonwealth Edison Co [Member]
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Long-term debt to financing trusts	205	205
Commonwealth Edison Co [Member] \| Estimate of Fair Value Measurement [Member]
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Long-term debt (including amounts due within one year)	9,006	11,305
Long-term debt to financing trusts	204	248
Commonwealth Edison Co [Member] \| Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 1 [Member]
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Long-term debt (including amounts due within one year)	0	0
Long-term debt to financing trusts	0	0
Commonwealth Edison Co [Member] \| Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 2 [Member]
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Long-term debt (including amounts due within one year)	9,006	11,305
Long-term debt to financing trusts	0	0
Commonwealth Edison Co [Member] \| Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 3 [Member]
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Long-term debt (including amounts due within one year)	0	0
Long-term debt to financing trusts	204	248
Commonwealth Edison Co [Member] \| Reported Value Measurement [Member]
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Long-term debt (including amounts due within one year)	10,518	9,773
Long-term debt to financing trusts	205	205
PECO Energy Co [Member]
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Long-term debt to financing trusts	184	184
PECO Energy Co [Member] \| Estimate of Fair Value Measurement [Member]
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Long-term debt (including amounts due within one year)	3,914	4,790
Long-term debt to financing trusts	180	222
PECO Energy Co [Member] \| Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 1 [Member]
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Long-term debt (including amounts due within one year)	0	0
Long-term debt to financing trusts	0	0
PECO Energy Co [Member] \| Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 2 [Member]
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Long-term debt (including amounts due within one year)	3,864	4,740
Long-term debt to financing trusts	0	0
PECO Energy Co [Member] \| Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 3 [Member]
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Long-term debt (including amounts due within one year)	50	50
Long-term debt to financing trusts	180	222
PECO Energy Co [Member] \| Reported Value Measurement [Member]
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Long-term debt (including amounts due within one year)	4,612	4,197
Long-term debt to financing trusts	184	184
Baltimore Gas and Electric Company [Member] \| Estimate of Fair Value Measurement [Member]
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Long-term debt (including amounts due within one year)	3,613	4,406
Baltimore Gas and Electric Company [Member] \| Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 1 [Member]
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Long-term debt (including amounts due within one year)	0	0
Baltimore Gas and Electric Company [Member] \| Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 2 [Member]
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Long-term debt (including amounts due within one year)	3,613	4,406
Baltimore Gas and Electric Company [Member] \| Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 3 [Member]
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Long-term debt (including amounts due within one year)	0	0
Baltimore Gas and Electric Company [Member] \| Reported Value Measurement [Member]
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Long-term debt (including amounts due within one year)	4,207	3,961
Pepco Holdings LLC [Member]
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Long-term debt (including amounts due within one year)	462	495
Pepco Holdings LLC [Member] \| Estimate of Fair Value Measurement [Member]
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Long-term debt (including amounts due within one year)	6,784	8,137
Pepco Holdings LLC [Member] \| Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 1 [Member]
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Long-term debt (including amounts due within one year)	0	0
Pepco Holdings LLC [Member] \| Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 2 [Member]
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Long-term debt (including amounts due within one year)	4,507	5,970
Pepco Holdings LLC [Member] \| Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 3 [Member]
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Long-term debt (including amounts due within one year)	2,277	2,167
Pepco Holdings LLC [Member] \| Reported Value Measurement [Member]
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Long-term debt (including amounts due within one year)	8,120	7,547
Potomac Electric Power Company [Member] \| Estimate of Fair Value Measurement [Member]
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Long-term debt (including amounts due within one year)	3,434	4,176
Potomac Electric Power Company [Member] \| Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 1 [Member]
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Long-term debt (including amounts due within one year)	0	0
Potomac Electric Power Company [Member] \| Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 2 [Member]
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Long-term debt (including amounts due within one year)	2,229	3,201
Potomac Electric Power Company [Member] \| Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 3 [Member]
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Long-term debt (including amounts due within one year)	1,205	975
Potomac Electric Power Company [Member] \| Reported Value Measurement [Member]
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Long-term debt (including amounts due within one year)	3,751	3,445
Delmarva Power & Light Company [Member] \| Estimate of Fair Value Measurement [Member]
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Long-term debt (including amounts due within one year)	1,622	1,978
Delmarva Power & Light Company [Member] \| Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 1 [Member]
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Long-term debt (including amounts due within one year)	0	0
Delmarva Power & Light Company [Member] \| Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 2 [Member]
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Long-term debt (including amounts due within one year)	1,164	1,426
Delmarva Power & Light Company [Member] \| Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 3 [Member]
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Long-term debt (including amounts due within one year)	458	552
Delmarva Power & Light Company [Member] \| Reported Value Measurement [Member]
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Long-term debt (including amounts due within one year)	1,938	1,810
Atlantic City Electric Company [Member] \| Estimate of Fair Value Measurement [Member]
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Long-term debt (including amounts due within one year)	1,523	1,732
Atlantic City Electric Company [Member] \| Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 1 [Member]
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Long-term debt (including amounts due within one year)	0	0
Atlantic City Electric Company [Member] \| Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 2 [Member]
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Long-term debt (including amounts due within one year)	909	1,091
Atlantic City Electric Company [Member] \| Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 3 [Member]
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Long-term debt (including amounts due within one year)	614	641
Atlantic City Electric Company [Member] \| Reported Value Measurement [Member]
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Long-term debt (including amounts due within one year)	$ 1,757	$ 1,582

Fair Value of Financial Asset_5

Fair Value of Financial Assets and Liabilities - Fair Value Measurement of Assets and Liabilities, Recurring (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Footnotes To Fair Value Assets And Liabilities Measured On Recurring Basis [Abstract]
Derivative, Notional Amount	$ 3,434	$ 3,481
Unrealized Gain (Loss) on Investments	(16)	(160)	$ 186
Market-to-market derivative liabilities, current	8	18
Derivative Liability, Noncurrent	83	201
Cash and Cash Equivalents [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	345	464
Restricted cash [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	81	49
Other assets
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	117	44
Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	664	524
Assets, Fair Value Disclosure	891	752
Deferred Compensation Liability, Current and Noncurrent	(75)	(131)
Total liabilities	(166)	(350)
Fair Value, Net Asset (Liability)	725	402
Fair Value, Recurring [Member] \| Economic Hedging Instrument Liabilites [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Total mark-to-market derivative liabilities	(3)	0
Fair Value, Recurring [Member] \| Derivatives Designated as Hedging Instruments Liabilities [Domain]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Total mark-to-market derivative liabilities	(4)	0
Fair Value, Recurring [Member] \| Interest Rate Derivative Liabilities [Domain]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Total mark-to-market derivative liabilities	(7)	0
Fair Value, Recurring [Member] \| Mark-to-Market Derivative Liabilities [Domain]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Total mark-to-market derivative liabilities	(84)	(219)
Fair Value, Recurring [Member] \| Rabbi Trust Investments [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	216	228
Fair Value, Recurring [Member] \| Cash Equivalents [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	62	60
Fair Value, Recurring [Member] \| Mutual Fund [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	49	60
Fair Value, Recurring [Member] \| Fixed Income Investments [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	7	10
Fair Value, Recurring [Member] \| 6311 Life Insurance [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	98	98
Fair Value, Recurring [Member] \| Designated as Hedging Instrument [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Derivative Asset	6	0
Fair Value, Recurring [Member] \| Economic Hedges [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Derivative Asset	5	0
Fair Value, Recurring [Member] \| Interest Rate Derivative Assets
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Derivative Asset	11	0
Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	664	524
Assets, Fair Value Disclosure	775	644
Deferred Compensation Liability, Current and Noncurrent	0	0
Total liabilities	0	0
Fair Value, Net Asset (Liability)	775	644
Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member] \| Economic Hedging Instrument Liabilites [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Total mark-to-market derivative liabilities	0	0
Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member] \| Derivatives Designated as Hedging Instruments Liabilities [Domain]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Total mark-to-market derivative liabilities	0	0
Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member] \| Interest Rate Derivative Liabilities [Domain]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Total mark-to-market derivative liabilities	0	0
Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member] \| Mark-to-Market Derivative Liabilities [Domain]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Total mark-to-market derivative liabilities	0	0
Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member] \| Rabbi Trust Investments [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	111	120
Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member] \| Cash Equivalents [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	62	60
Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member] \| Mutual Fund [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	49	60
Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member] \| Fixed Income Investments [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member] \| 6311 Life Insurance [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member] \| Designated as Hedging Instrument [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Derivative Asset	0	0
Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member] \| Economic Hedges [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Derivative Asset	0	0
Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member] \| Interest Rate Derivative Assets
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Derivative Asset	0	0
Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	0	0
Assets, Fair Value Disclosure	76	71
Deferred Compensation Liability, Current and Noncurrent	(75)	(131)
Total liabilities	(82)	(131)
Fair Value, Net Asset (Liability)	(6)	(60)
Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member] \| Economic Hedging Instrument Liabilites [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Total mark-to-market derivative liabilities	(3)	0
Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member] \| Derivatives Designated as Hedging Instruments Liabilities [Domain]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Total mark-to-market derivative liabilities	(4)	0
Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member] \| Interest Rate Derivative Liabilities [Domain]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Total mark-to-market derivative liabilities	(7)	0
Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member] \| Mark-to-Market Derivative Liabilities [Domain]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Total mark-to-market derivative liabilities	0	0
Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member] \| Rabbi Trust Investments [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	65	71
Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member] \| Cash Equivalents [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member] \| Mutual Fund [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member] \| Fixed Income Investments [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	7	10
Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member] \| 6311 Life Insurance [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	58	61
Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member] \| Designated as Hedging Instrument [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Derivative Asset	6	0
Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member] \| Economic Hedges [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Derivative Asset	5	0
Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member] \| Interest Rate Derivative Assets
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Derivative Asset	11	0
Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	0	0
Assets, Fair Value Disclosure	40	37
Deferred Compensation Liability, Current and Noncurrent	0	0
Total liabilities	(84)	(219)
Fair Value, Net Asset (Liability)	(44)	(182)
Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member] \| Economic Hedging Instrument Liabilites [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Total mark-to-market derivative liabilities	0	0
Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member] \| Derivatives Designated as Hedging Instruments Liabilities [Domain]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Total mark-to-market derivative liabilities	0	0
Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member] \| Interest Rate Derivative Liabilities [Domain]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Total mark-to-market derivative liabilities	0	0
Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member] \| Mark-to-Market Derivative Liabilities [Domain]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Total mark-to-market derivative liabilities	(84)	(219)
Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member] \| Rabbi Trust Investments [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	40	37
Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member] \| Cash Equivalents [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member] \| Mutual Fund [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member] \| Fixed Income Investments [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member] \| 6311 Life Insurance [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	40	37
Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member] \| Designated as Hedging Instrument [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Derivative Asset	0	0
Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member] \| Economic Hedges [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Derivative Asset	0	0
Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member] \| Interest Rate Derivative Assets
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Derivative Asset	0	0
Fair Value Measured at Net Asset Value Per Share [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Assets, Fair Value Disclosure	0	0
Total liabilities	0	0
Commonwealth Edison Co [Member]
Footnotes To Fair Value Assets And Liabilities Measured On Recurring Basis [Abstract]
Market-to-market derivative liabilities, current	5	18
Derivative Liability, Noncurrent	79	201
Commonwealth Edison Co [Member] \| Cash and Cash Equivalents [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	42	105
Commonwealth Edison Co [Member] \| Restricted cash [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	77	42
Commonwealth Edison Co [Member] \| Other assets
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	117	43
Commonwealth Edison Co [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	392	237
Derivative Asset	0
Assets, Fair Value Disclosure	392	237
Total mark-to-market derivative liabilities	(84)	(219)
Deferred Compensation Liability, Current and Noncurrent	(8)	(10)
Total liabilities	(92)	(229)
Fair Value, Net Asset (Liability)	300	8
Commonwealth Edison Co [Member] \| Fair Value, Recurring [Member] \| Rabbi Trust Investments [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Commonwealth Edison Co [Member] \| Fair Value, Recurring [Member] \| Mutual Fund [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Commonwealth Edison Co [Member] \| Fair Value, Recurring [Member] \| 6311 Life Insurance [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Commonwealth Edison Co [Member] \| Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	392	237
Assets, Fair Value Disclosure	392	237
Total mark-to-market derivative liabilities	0	0
Deferred Compensation Liability, Current and Noncurrent	0	0
Total liabilities	0	0
Fair Value, Net Asset (Liability)	392	237
Commonwealth Edison Co [Member] \| Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member] \| Rabbi Trust Investments [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Commonwealth Edison Co [Member] \| Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member] \| Mutual Fund [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Commonwealth Edison Co [Member] \| Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member] \| 6311 Life Insurance [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Commonwealth Edison Co [Member] \| Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	0	0
Assets, Fair Value Disclosure	0	0
Total mark-to-market derivative liabilities	0	0
Deferred Compensation Liability, Current and Noncurrent	(8)	(10)
Total liabilities	(8)	(10)
Fair Value, Net Asset (Liability)	(8)	(10)
Commonwealth Edison Co [Member] \| Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member] \| Rabbi Trust Investments [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Commonwealth Edison Co [Member] \| Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member] \| Mutual Fund [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Commonwealth Edison Co [Member] \| Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member] \| 6311 Life Insurance [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Commonwealth Edison Co [Member] \| Fair Value, Inputs, Level 3 [Member]
Footnotes To Fair Value Assets And Liabilities Measured On Recurring Basis [Abstract]
Market-to-market derivative liabilities, current	5	18
Derivative Liability, Noncurrent	79	201
Commonwealth Edison Co [Member] \| Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	0	0
Assets, Fair Value Disclosure	0	0
Total mark-to-market derivative liabilities	(84)	(219)
Deferred Compensation Liability, Current and Noncurrent	0	0
Total liabilities	(84)	(219)
Fair Value, Net Asset (Liability)	(84)	(219)
Commonwealth Edison Co [Member] \| Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member] \| Rabbi Trust Investments [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Commonwealth Edison Co [Member] \| Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member] \| Mutual Fund [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Commonwealth Edison Co [Member] \| Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member] \| 6311 Life Insurance [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Commonwealth Edison Co [Member] \| Fair Value Measured at Net Asset Value Per Share [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Assets, Fair Value Disclosure	0	0
Total liabilities	0	0
PECO Energy Co [Member] \| Cash and Cash Equivalents [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	58	35
PECO Energy Co [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	10	9
Assets, Fair Value Disclosure	32	36
Total mark-to-market derivative liabilities	0	0
Deferred Compensation Liability, Current and Noncurrent	(7)	(9)
Total liabilities	(7)	(9)
Fair Value, Net Asset (Liability)	25	27
PECO Energy Co [Member] \| Fair Value, Recurring [Member] \| Rabbi Trust Investments [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	22	27
PECO Energy Co [Member] \| Fair Value, Recurring [Member] \| Mutual Fund [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	7	11
PECO Energy Co [Member] \| Fair Value, Recurring [Member] \| 6311 Life Insurance [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	15	16
PECO Energy Co [Member] \| Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	10	9
Assets, Fair Value Disclosure	17	20
Total mark-to-market derivative liabilities	0	0
Deferred Compensation Liability, Current and Noncurrent	0	0
Total liabilities	0	0
Fair Value, Net Asset (Liability)	17	20
PECO Energy Co [Member] \| Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member] \| Rabbi Trust Investments [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	7	11
PECO Energy Co [Member] \| Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member] \| Mutual Fund [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	7	11
PECO Energy Co [Member] \| Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member] \| 6311 Life Insurance [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
PECO Energy Co [Member] \| Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	0	0
Assets, Fair Value Disclosure	15	16
Total mark-to-market derivative liabilities	0	0
Deferred Compensation Liability, Current and Noncurrent	(7)	(9)
Total liabilities	(7)	(9)
Fair Value, Net Asset (Liability)	8	7
PECO Energy Co [Member] \| Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member] \| Rabbi Trust Investments [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	15	16
PECO Energy Co [Member] \| Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member] \| Mutual Fund [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
PECO Energy Co [Member] \| Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member] \| 6311 Life Insurance [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	15	16
PECO Energy Co [Member] \| Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	0	0
Assets, Fair Value Disclosure	0	0
Total mark-to-market derivative liabilities	0	0
Deferred Compensation Liability, Current and Noncurrent	0	0
Total liabilities	0	0
Fair Value, Net Asset (Liability)	0	0
PECO Energy Co [Member] \| Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member] \| Rabbi Trust Investments [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
PECO Energy Co [Member] \| Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member] \| Mutual Fund [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
PECO Energy Co [Member] \| Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member] \| 6311 Life Insurance [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
PECO Energy Co [Member] \| Fair Value Measured at Net Asset Value Per Share [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Assets, Fair Value Disclosure	0	0
Total liabilities	0	0
Baltimore Gas and Electric Company [Member] \| Cash and Cash Equivalents [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	43	51
Baltimore Gas and Electric Company [Member] \| Restricted cash [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	1	4
Baltimore Gas and Electric Company [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	23	0
Assets, Fair Value Disclosure	30	14
Total mark-to-market derivative liabilities	0	0
Deferred Compensation Liability, Current and Noncurrent	(4)	(7)
Total liabilities	(4)	(7)
Fair Value, Net Asset (Liability)	26	7
Baltimore Gas and Electric Company [Member] \| Fair Value, Recurring [Member] \| Rabbi Trust Investments [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	7	14
Baltimore Gas and Electric Company [Member] \| Fair Value, Recurring [Member] \| Mutual Fund [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	7	14
Baltimore Gas and Electric Company [Member] \| Fair Value, Recurring [Member] \| 6311 Life Insurance [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Baltimore Gas and Electric Company [Member] \| Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	23	0
Assets, Fair Value Disclosure	30	14
Total mark-to-market derivative liabilities	0	0
Deferred Compensation Liability, Current and Noncurrent	0	0
Total liabilities	0	0
Fair Value, Net Asset (Liability)	30	14
Baltimore Gas and Electric Company [Member] \| Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member] \| Rabbi Trust Investments [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	7	14
Baltimore Gas and Electric Company [Member] \| Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member] \| Mutual Fund [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	7	14
Baltimore Gas and Electric Company [Member] \| Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member] \| 6311 Life Insurance [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Baltimore Gas and Electric Company [Member] \| Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	0	0
Assets, Fair Value Disclosure	0	0
Total mark-to-market derivative liabilities	0	0
Deferred Compensation Liability, Current and Noncurrent	(4)	(7)
Total liabilities	(4)	(7)
Fair Value, Net Asset (Liability)	(4)	(7)
Baltimore Gas and Electric Company [Member] \| Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member] \| Rabbi Trust Investments [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Baltimore Gas and Electric Company [Member] \| Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member] \| Mutual Fund [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Baltimore Gas and Electric Company [Member] \| Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member] \| 6311 Life Insurance [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Baltimore Gas and Electric Company [Member] \| Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	0	0
Assets, Fair Value Disclosure	0	0
Total mark-to-market derivative liabilities	0	0
Deferred Compensation Liability, Current and Noncurrent	0	0
Total liabilities	0	0
Fair Value, Net Asset (Liability)	0	0
Baltimore Gas and Electric Company [Member] \| Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member] \| Rabbi Trust Investments [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Baltimore Gas and Electric Company [Member] \| Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member] \| Mutual Fund [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Baltimore Gas and Electric Company [Member] \| Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member] \| 6311 Life Insurance [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Baltimore Gas and Electric Company [Member] \| Fair Value Measured at Net Asset Value Per Share [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Assets, Fair Value Disclosure	0	0
Total liabilities	0	0
Pepco Holdings LLC [Member] \| Cash and Cash Equivalents [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	165	100
Pepco Holdings LLC [Member] \| Restricted cash [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	3	3
Pepco Holdings LLC [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	205	110
Assets, Fair Value Disclosure	343	255
Deferred Compensation Liability, Current and Noncurrent	(14)	(18)
Total liabilities	(14)	(18)
Fair Value, Net Asset (Liability)	329	237
Pepco Holdings LLC [Member] \| Fair Value, Recurring [Member] \| Rabbi Trust Investments [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	138	145
Pepco Holdings LLC [Member] \| Fair Value, Recurring [Member] \| Cash Equivalents [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	59	59
Pepco Holdings LLC [Member] \| Fair Value, Recurring [Member] \| Mutual Fund [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	11	14
Pepco Holdings LLC [Member] \| Fair Value, Recurring [Member] \| Fixed Income Investments [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	7	10
Pepco Holdings LLC [Member] \| Fair Value, Recurring [Member] \| 6311 Life Insurance [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	61	62
Pepco Holdings LLC [Member] \| Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	205	110
Assets, Fair Value Disclosure	275	183
Deferred Compensation Liability, Current and Noncurrent	0	0
Total liabilities	0	0
Fair Value, Net Asset (Liability)	275	183
Pepco Holdings LLC [Member] \| Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member] \| Rabbi Trust Investments [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	70	73
Pepco Holdings LLC [Member] \| Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member] \| Cash Equivalents [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	59	59
Pepco Holdings LLC [Member] \| Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member] \| Mutual Fund [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	11	14
Pepco Holdings LLC [Member] \| Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member] \| Fixed Income Investments [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Pepco Holdings LLC [Member] \| Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member] \| 6311 Life Insurance [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Pepco Holdings LLC [Member] \| Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	0	0
Assets, Fair Value Disclosure	29	37
Deferred Compensation Liability, Current and Noncurrent	(14)	(18)
Total liabilities	(14)	(18)
Fair Value, Net Asset (Liability)	15	19
Pepco Holdings LLC [Member] \| Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member] \| Rabbi Trust Investments [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	29	37
Pepco Holdings LLC [Member] \| Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member] \| Cash Equivalents [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Pepco Holdings LLC [Member] \| Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member] \| Mutual Fund [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Pepco Holdings LLC [Member] \| Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member] \| Fixed Income Investments [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	7	10
Pepco Holdings LLC [Member] \| Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member] \| 6311 Life Insurance [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	22	27
Pepco Holdings LLC [Member] \| Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	0	0
Assets, Fair Value Disclosure	39	35
Deferred Compensation Liability, Current and Noncurrent	0	0
Total liabilities	0	0
Fair Value, Net Asset (Liability)	39	35
Pepco Holdings LLC [Member] \| Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member] \| Rabbi Trust Investments [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	39	35
Pepco Holdings LLC [Member] \| Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member] \| Cash Equivalents [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Pepco Holdings LLC [Member] \| Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member] \| Mutual Fund [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Pepco Holdings LLC [Member] \| Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member] \| Fixed Income Investments [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Pepco Holdings LLC [Member] \| Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member] \| 6311 Life Insurance [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	39	35
Pepco Holdings LLC [Member] \| Fair Value Measured at Net Asset Value Per Share [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Assets, Fair Value Disclosure	0	0
Total liabilities	0	0
Potomac Electric Power Company [Member] \| Cash and Cash Equivalents [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	45	34
Potomac Electric Power Company [Member] \| Restricted cash [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	3	3
Potomac Electric Power Company [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	51	31
Assets, Fair Value Disclosure	170	151
Deferred Compensation Liability, Current and Noncurrent	(1)	(2)
Total liabilities	(1)	(2)
Fair Value, Net Asset (Liability)	169	149
Potomac Electric Power Company [Member] \| Fair Value, Recurring [Member] \| Rabbi Trust Investments [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	119	120
Potomac Electric Power Company [Member] \| Fair Value, Recurring [Member] \| Cash Equivalents [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	59	58
Potomac Electric Power Company [Member] \| Fair Value, Recurring [Member] \| 6311 Life Insurance [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	60	62
Potomac Electric Power Company [Member] \| Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	51	31
Assets, Fair Value Disclosure	110	89
Deferred Compensation Liability, Current and Noncurrent	0	0
Total liabilities	0	0
Fair Value, Net Asset (Liability)	110	89
Potomac Electric Power Company [Member] \| Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member] \| Rabbi Trust Investments [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	59	58
Potomac Electric Power Company [Member] \| Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member] \| Cash Equivalents [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	59	58
Potomac Electric Power Company [Member] \| Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member] \| 6311 Life Insurance [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Potomac Electric Power Company [Member] \| Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	0	0
Assets, Fair Value Disclosure	22	27
Deferred Compensation Liability, Current and Noncurrent	(1)	(2)
Total liabilities	(1)	(2)
Fair Value, Net Asset (Liability)	21	25
Potomac Electric Power Company [Member] \| Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member] \| Rabbi Trust Investments [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	22	27
Potomac Electric Power Company [Member] \| Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member] \| Cash Equivalents [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Potomac Electric Power Company [Member] \| Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member] \| 6311 Life Insurance [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	22	27
Potomac Electric Power Company [Member] \| Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	0	0
Assets, Fair Value Disclosure	38	35
Deferred Compensation Liability, Current and Noncurrent	0	0
Total liabilities	0	0
Fair Value, Net Asset (Liability)	38	35
Potomac Electric Power Company [Member] \| Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member] \| Rabbi Trust Investments [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	38	35
Potomac Electric Power Company [Member] \| Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member] \| Cash Equivalents [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Potomac Electric Power Company [Member] \| Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member] \| 6311 Life Insurance [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	38	35
Potomac Electric Power Company [Member] \| Fair Value Measured at Net Asset Value Per Share [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Assets, Fair Value Disclosure	0	0
Total liabilities	0	0
Delmarva Power & Light Company [Member] \| Cash and Cash Equivalents [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	31	28
Delmarva Power & Light Company [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	121	43
Assets, Fair Value Disclosure	121	43
Deferred Compensation Liability, Current and Noncurrent	0	0
Total liabilities	0	0
Fair Value, Net Asset (Liability)	121	43
Delmarva Power & Light Company [Member] \| Fair Value, Recurring [Member] \| Rabbi Trust Investments [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Delmarva Power & Light Company [Member] \| Fair Value, Recurring [Member] \| Cash Equivalents [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Delmarva Power & Light Company [Member] \| Fair Value, Recurring [Member] \| 6311 Life Insurance [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Delmarva Power & Light Company [Member] \| Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	121	43
Assets, Fair Value Disclosure	121	43
Deferred Compensation Liability, Current and Noncurrent	0	0
Total liabilities	0	0
Fair Value, Net Asset (Liability)	121	43
Delmarva Power & Light Company [Member] \| Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member] \| Rabbi Trust Investments [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Delmarva Power & Light Company [Member] \| Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member] \| Cash Equivalents [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Delmarva Power & Light Company [Member] \| Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member] \| 6311 Life Insurance [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Delmarva Power & Light Company [Member] \| Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	0	0
Assets, Fair Value Disclosure	0	0
Deferred Compensation Liability, Current and Noncurrent	0	0
Total liabilities	0	0
Fair Value, Net Asset (Liability)	0	0
Delmarva Power & Light Company [Member] \| Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member] \| Rabbi Trust Investments [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Delmarva Power & Light Company [Member] \| Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member] \| Cash Equivalents [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Delmarva Power & Light Company [Member] \| Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member] \| 6311 Life Insurance [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Delmarva Power & Light Company [Member] \| Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	0	0
Assets, Fair Value Disclosure	0	0
Deferred Compensation Liability, Current and Noncurrent	0	0
Total liabilities	0	0
Fair Value, Net Asset (Liability)	0	0
Delmarva Power & Light Company [Member] \| Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member] \| Rabbi Trust Investments [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Delmarva Power & Light Company [Member] \| Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member] \| Cash Equivalents [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Delmarva Power & Light Company [Member] \| Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member] \| 6311 Life Insurance [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Delmarva Power & Light Company [Member] \| Fair Value Measured at Net Asset Value Per Share [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Assets, Fair Value Disclosure	0	0
Total liabilities	0	0
Atlantic City Electric Company [Member] \| Cash and Cash Equivalents [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	71	29
Atlantic City Electric Company [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	1	0
Assets, Fair Value Disclosure	1	0
Deferred Compensation Liability, Current and Noncurrent	0	0
Total liabilities	0	0
Fair Value, Net Asset (Liability)	1	0
Atlantic City Electric Company [Member] \| Fair Value, Recurring [Member] \| Rabbi Trust Investments [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Atlantic City Electric Company [Member] \| Fair Value, Recurring [Member] \| Cash Equivalents [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Atlantic City Electric Company [Member] \| Fair Value, Recurring [Member] \| 6311 Life Insurance [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Atlantic City Electric Company [Member] \| Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	1	0
Assets, Fair Value Disclosure	1	0
Deferred Compensation Liability, Current and Noncurrent	0	0
Total liabilities	0	0
Fair Value, Net Asset (Liability)	1	0
Atlantic City Electric Company [Member] \| Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member] \| Rabbi Trust Investments [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Atlantic City Electric Company [Member] \| Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member] \| Cash Equivalents [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Atlantic City Electric Company [Member] \| Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member] \| 6311 Life Insurance [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Atlantic City Electric Company [Member] \| Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	0	0
Assets, Fair Value Disclosure	0	0
Deferred Compensation Liability, Current and Noncurrent	0	0
Total liabilities	0	0
Fair Value, Net Asset (Liability)	0	0
Atlantic City Electric Company [Member] \| Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member] \| Rabbi Trust Investments [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Atlantic City Electric Company [Member] \| Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member] \| Cash Equivalents [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Atlantic City Electric Company [Member] \| Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member] \| 6311 Life Insurance [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Atlantic City Electric Company [Member] \| Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	0	0
Assets, Fair Value Disclosure	0	0
Deferred Compensation Liability, Current and Noncurrent	0	0
Total liabilities	0	0
Fair Value, Net Asset (Liability)	0	0
Atlantic City Electric Company [Member] \| Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member] \| Rabbi Trust Investments [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Atlantic City Electric Company [Member] \| Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member] \| Cash Equivalents [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Atlantic City Electric Company [Member] \| Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member] \| 6311 Life Insurance [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Atlantic City Electric Company [Member] \| Fair Value Measured at Net Asset Value Per Share [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Assets, Fair Value Disclosure	0	0
Total liabilities	$ 0	$ 0

Fair Value of Financial Asset_6

Fair Value of Financial Assets and Liabilities - Fair Value Reconciliation of Level 3 Assets and Liabilities Measured on a Recurring Basis (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance	$ (182)	$ (267)
Total realized / unrealized gains (losses)
Included in net income	5	3
Included in regulatory assets/liabilities	135	82
Purchases, sales, issuances and settlements
Settlements	0	(2)
Transfers into Level 3		2
Transfers out of Level 3	(2)
Ending Balance	(44)	(182)
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss)	5	3
Commonwealth Edison Co [Member] \| Derivative [Member] \| Interest Rate Swap [Member]
Purchases, sales, issuances and settlements
Realized Investment Gains (Losses)	(1)	20
Commonwealth Edison Co [Member] \| Derivative [Member] \| Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance	(219)	(301)
Total realized / unrealized gains (losses)
Included in net income	0	0
Included in regulatory assets/liabilities	135	82
Purchases, sales, issuances and settlements
Settlements	0	0
Transfers into Level 3		0
Transfers out of Level 3	0
Ending Balance	(84)	(219)
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss)	0	0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Period Increase (Decrease)	(136)	(62)
Pepco Holdings LLC [Member] \| 6311 Life Insurance [Member] \| Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance	35	34
Total realized / unrealized gains (losses)
Included in net income	5	3
Included in regulatory assets/liabilities	0	0
Purchases, sales, issuances and settlements
Settlements	0	(2)
Transfers into Level 3		0
Transfers out of Level 3	0
Ending Balance	40	35
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss)	5	3
Potomac Electric Power Company [Member] \| 6311 Life Insurance [Member] \| Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance	35	34
Total realized / unrealized gains (losses)
Included in net income	5	3
Included in regulatory assets/liabilities	0	0
Purchases, sales, issuances and settlements
Settlements	0	(2)
Transfers into Level 3		0
Transfers out of Level 3	0
Ending Balance	40	35
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss)	$ 5	$ 3

Fair Value of Financial Asset_7

Fair Value of Financial Assets and Liabilities - Fair Value Inputs Assets Quantitative Information (Details) - Derivative [Member] - Fair Value, Inputs, Level 3 [Member] - USD ($)	Dec. 31, 2022	Dec. 31, 2021
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	$ (84,000,000)	$ (219,000,000)
Minimum [Member] \| Discounted Cash Flow [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value Inputs Forward Power Price	34.78	28.65
Arithmetic Average [Member] \| Discounted Cash Flow [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value Inputs Forward Power Price	48.44	33.96
Maximum [Member] \| Discounted Cash Flow [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value Inputs Forward Power Price	75.71	47.10
Commonwealth Edison Co [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	$ (84,000,000)	$ (219,000,000)
Commonwealth Edison Co [Member] \| Minimum [Member] \| Discounted Cash Flow [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value Inputs Forward Power Price	34.78	28.65
Commonwealth Edison Co [Member] \| Arithmetic Average [Member] \| Discounted Cash Flow [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value Inputs Forward Power Price	48.44	33.96
Commonwealth Edison Co [Member] \| Maximum [Member] \| Discounted Cash Flow [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value Inputs Forward Power Price	75.71	47.10

Commitments and Contingencies -

Commitments and Contingencies - Narrative (Details) $ in Millions		12 Months Ended
	Mar. 23, 2016 MW	Dec. 31, 2022 USD ($) MGPSite MW	Dec. 31, 2018 MW	Dec. 31, 2017 MW	Dec. 31, 2021 USD ($)
Commitments and Contingencies [Line Items]
Other Commitment		$ 631
Accrual for Environmental Loss Contingencies, Gross		409			$ 352
Deferred Prosecution Payment		200
Commonwealth Edison Co [Member]
Commitments and Contingencies [Line Items]
Other Commitment		$ 258
Sites under study/remediation \| MGPSite		20
Accrual for Environmental Loss Contingencies, Gross		$ 325			279
Deferred Prosecution Payment		200
Customer Refund Liability, Current		38
Customer Refund Liability, Current		38
Commonwealth Edison Co [Member] \| Illinois Chamber of Commerce
Commitments and Contingencies [Line Items]
Customer Refund Liability, Current		31
Customer Refund Liability, Current		31
Commonwealth Edison Co [Member] \| Accrual For MGP Investigation And Remediation [Member]
Commitments and Contingencies [Line Items]
Accrual for Environmental Loss Contingencies, Period Increase (Decrease)		60
Accrual for Environmental Loss Contingencies, Period Increase (Decrease)		60
PECO Energy Co [Member]
Commitments and Contingencies [Line Items]
Other Commitment		$ 181
Sites under study/remediation \| MGPSite		6
Accrual for Environmental Loss Contingencies, Gross		$ 25			22
Baltimore Gas and Electric Company [Member]
Commitments and Contingencies [Line Items]
Other Commitment		$ 4
Sites under study/remediation \| MGPSite		4
Accrual for Environmental Loss Contingencies, Gross		$ 9			6
Banking Regulation, Common Equity Tier One Risk-Based Capital Ratio, Actual		0.48
Pepco Holdings LLC [Member]
Commitments and Contingencies [Line Items]
Other Commitment		$ 125
Accrual for Environmental Loss Contingencies, Gross		46			42
Potomac Electric Power Company [Member]
Commitments and Contingencies [Line Items]
Other Commitment		94
Accrual for Environmental Loss Contingencies, Gross		$ 44			40
Banking Regulation, Common Equity Tier One Risk-Based Capital Ratio, Actual		0.48
Delmarva Power & Light Company [Member]
Commitments and Contingencies [Line Items]
Other Commitment		$ 19
Sites under study/remediation \| MGPSite		1
Accrual for Environmental Loss Contingencies, Gross		$ 1			1
Banking Regulation, Common Equity Tier One Risk-Based Capital Ratio, Actual		0.48
Atlantic City Electric Company [Member]
Commitments and Contingencies [Line Items]
Other Commitment		$ 12
Accrual for Environmental Loss Contingencies, Gross		$ 1			$ 1
Banking Regulation, Common Equity Tier One Risk-Based Capital Ratio, Actual		0.48
Atlantic City Electric Company [Member] \| Minimum [Member]
Commitments and Contingencies [Line Items]
Banking Regulation, Common Equity Tier One Risk-Based Capital Ratio, Actual		0.30
PEPCO Holdings Inc [Member]
Commitments and Contingencies [Line Items]
Other Commitment		$ 513
PEPCO Holdings Inc [Member] \| Pepco Holdings LLC [Member]
Commitments and Contingencies [Line Items]
Other Commitment		320
PEPCO Holdings Inc [Member] \| Potomac Electric Power Company [Member]
Commitments and Contingencies [Line Items]
Other Commitment		120
PEPCO Holdings Inc [Member] \| Delmarva Power & Light Company [Member]
Commitments and Contingencies [Line Items]
Other Commitment		89
PEPCO Holdings Inc [Member] \| Atlantic City Electric Company [Member]
Commitments and Contingencies [Line Items]
Other Commitment		$ 111
PEPCO Holdings Inc [Member] \| Wind Assets [Member] \| Delmarva Power & Light Company [Member]
Commitments and Contingencies [Line Items]
Purchase Commitment \| MW	120	40	40	40

Commitments and Contingencies_3

Commitments and Contingencies - Schedule of PHI Merger Commitments (Details) $ in Millions	Dec. 31, 2022 USD ($)
PHI Merger Commitments [Line Items]
Other Commitment	$ 631
PEPCO Holdings Inc [Member]
PHI Merger Commitments [Line Items]
Other Commitment	513
Pepco Holdings LLC [Member]
PHI Merger Commitments [Line Items]
Other Commitment	125
Pepco Holdings LLC [Member] \| PEPCO Holdings Inc [Member]
PHI Merger Commitments [Line Items]
Other Commitment	320
Potomac Electric Power Company [Member]
PHI Merger Commitments [Line Items]
Other Commitment	94
Potomac Electric Power Company [Member] \| PEPCO Holdings Inc [Member]
PHI Merger Commitments [Line Items]
Other Commitment	120
Delmarva Power & Light Company [Member]
PHI Merger Commitments [Line Items]
Other Commitment	19
Delmarva Power & Light Company [Member] \| PEPCO Holdings Inc [Member]
PHI Merger Commitments [Line Items]
Other Commitment	89
Atlantic City Electric Company [Member]
PHI Merger Commitments [Line Items]
Other Commitment	12
Atlantic City Electric Company [Member] \| PEPCO Holdings Inc [Member]
PHI Merger Commitments [Line Items]
Other Commitment	111
Remaining Commitment [Member] \| PEPCO Holdings Inc [Member]
PHI Merger Commitments [Line Items]
Other Commitment	52
Remaining Commitment [Member] \| Pepco Holdings LLC [Member] \| PEPCO Holdings Inc [Member]
PHI Merger Commitments [Line Items]
Other Commitment	45
Remaining Commitment [Member] \| Potomac Electric Power Company [Member] \| PEPCO Holdings Inc [Member]
PHI Merger Commitments [Line Items]
Other Commitment	39
Remaining Commitment [Member] \| Delmarva Power & Light Company [Member] \| PEPCO Holdings Inc [Member]
PHI Merger Commitments [Line Items]
Other Commitment	4
Remaining Commitment [Member] \| Atlantic City Electric Company [Member] \| PEPCO Holdings Inc [Member]
PHI Merger Commitments [Line Items]
Other Commitment	$ 2

Commitments and Contingencies_4

Commitments and Contingencies - Schedule of Commercial Commitments (Details) $ in Millions	Dec. 31, 2022 USD ($)
Guarantor Obligations [Line Items]
Other Commitment	$ 631
Other Commitments, Due in Next Twelve Months	220
Other Commitment, to be Paid, Year Two	10
Other Commitment, to be Paid, Year Three	6
Other Commitment, to be Paid, Year Four	5
Other Commitment, to be Paid, Year Five	4
Other Commitment, to be Paid, after Year Five	386
Guarantee obligations maximum exposure	68
Commonwealth Edison Co [Member]
Guarantor Obligations [Line Items]
Other Commitment	258
Other Commitments, Due in Next Twelve Months	54
Other Commitment, to be Paid, Year Two	4
Other Commitment, to be Paid, Year Three	0
Other Commitment, to be Paid, Year Four	0
Other Commitment, to be Paid, Year Five	0
Other Commitment, to be Paid, after Year Five	200
PECO Energy Co [Member]
Guarantor Obligations [Line Items]
Other Commitment	181
Other Commitments, Due in Next Twelve Months	3
Other Commitment, to be Paid, Year Two	0
Other Commitment, to be Paid, Year Three	0
Other Commitment, to be Paid, Year Four	0
Other Commitment, to be Paid, Year Five	0
Other Commitment, to be Paid, after Year Five	178
Baltimore Gas and Electric Company [Member]
Guarantor Obligations [Line Items]
Other Commitment	4
Other Commitments, Due in Next Twelve Months	4
Other Commitment, to be Paid, Year Two	0
Other Commitment, to be Paid, Year Three	0
Other Commitment, to be Paid, Year Four	0
Other Commitment, to be Paid, Year Five	0
Other Commitment, to be Paid, after Year Five	0
Pepco Holdings LLC [Member]
Guarantor Obligations [Line Items]
Other Commitment	125
Other Commitments, Due in Next Twelve Months	96
Other Commitment, to be Paid, Year Two	6
Other Commitment, to be Paid, Year Three	6
Other Commitment, to be Paid, Year Four	5
Other Commitment, to be Paid, Year Five	4
Other Commitment, to be Paid, after Year Five	8
Guarantee obligations maximum exposure	68
Potomac Electric Power Company [Member]
Guarantor Obligations [Line Items]
Other Commitment	94
Other Commitments, Due in Next Twelve Months	84
Other Commitment, to be Paid, Year Two	2
Other Commitment, to be Paid, Year Three	2
Other Commitment, to be Paid, Year Four	2
Other Commitment, to be Paid, Year Five	1
Other Commitment, to be Paid, after Year Five	3
Guarantee obligations maximum exposure	22
Delmarva Power & Light Company [Member]
Guarantor Obligations [Line Items]
Other Commitment	19
Other Commitments, Due in Next Twelve Months	7
Other Commitment, to be Paid, Year Two	3
Other Commitment, to be Paid, Year Three	2
Other Commitment, to be Paid, Year Four	2
Other Commitment, to be Paid, Year Five	2
Other Commitment, to be Paid, after Year Five	3
Guarantee obligations maximum exposure	28
Atlantic City Electric Company [Member]
Guarantor Obligations [Line Items]
Other Commitment	12
Other Commitments, Due in Next Twelve Months	5
Other Commitment, to be Paid, Year Two	1
Other Commitment, to be Paid, Year Three	2
Other Commitment, to be Paid, Year Four	1
Other Commitment, to be Paid, Year Five	1
Other Commitment, to be Paid, after Year Five	2
Guarantee obligations maximum exposure	18
Financial Standby Letter of Credit [Member]
Guarantor Obligations [Line Items]
Other Commitment	19
Other Commitments, Due in Next Twelve Months	17
Other Commitment, to be Paid, Year Two	2
Other Commitment, to be Paid, Year Three	0
Other Commitment, to be Paid, Year Four	0
Other Commitment, to be Paid, Year Five	0
Other Commitment, to be Paid, after Year Five	0
Financial Standby Letter of Credit [Member] \| Commonwealth Edison Co [Member]
Guarantor Obligations [Line Items]
Other Commitment	12
Other Commitments, Due in Next Twelve Months	10
Other Commitment, to be Paid, Year Two	2
Other Commitment, to be Paid, Year Three	0
Other Commitment, to be Paid, Year Four	0
Other Commitment, to be Paid, Year Five	0
Other Commitment, to be Paid, after Year Five	0
Financial Standby Letter of Credit [Member] \| PECO Energy Co [Member]
Guarantor Obligations [Line Items]
Other Commitment	1
Other Commitments, Due in Next Twelve Months	1
Other Commitment, to be Paid, Year Two	0
Other Commitment, to be Paid, Year Three	0
Other Commitment, to be Paid, Year Four	0
Other Commitment, to be Paid, Year Five	0
Other Commitment, to be Paid, after Year Five	0
Financial Standby Letter of Credit [Member] \| Baltimore Gas and Electric Company [Member]
Guarantor Obligations [Line Items]
Other Commitment	2
Other Commitments, Due in Next Twelve Months	2
Other Commitment, to be Paid, Year Two	0
Other Commitment, to be Paid, Year Three	0
Other Commitment, to be Paid, Year Four	0
Other Commitment, to be Paid, Year Five	0
Other Commitment, to be Paid, after Year Five	0
Surety Bond [Member]
Guarantor Obligations [Line Items]
Other Commitment	205
Other Commitments, Due in Next Twelve Months	203
Other Commitment, to be Paid, Year Two	2
Other Commitment, to be Paid, Year Three	0
Other Commitment, to be Paid, Year Four	0
Other Commitment, to be Paid, Year Five	0
Other Commitment, to be Paid, after Year Five	0
Surety Bond [Member] \| Commonwealth Edison Co [Member]
Guarantor Obligations [Line Items]
Other Commitment	46
Other Commitments, Due in Next Twelve Months	44
Other Commitment, to be Paid, Year Two	2
Other Commitment, to be Paid, Year Three	0
Other Commitment, to be Paid, Year Four	0
Other Commitment, to be Paid, Year Five	0
Other Commitment, to be Paid, after Year Five	0
Surety Bond [Member] \| PECO Energy Co [Member]
Guarantor Obligations [Line Items]
Other Commitment	2
Other Commitments, Due in Next Twelve Months	2
Other Commitment, to be Paid, Year Two	0
Other Commitment, to be Paid, Year Three	0
Other Commitment, to be Paid, Year Four	0
Other Commitment, to be Paid, Year Five	0
Other Commitment, to be Paid, after Year Five	0
Surety Bond [Member] \| Baltimore Gas and Electric Company [Member]
Guarantor Obligations [Line Items]
Other Commitment	2
Other Commitments, Due in Next Twelve Months	2
Other Commitment, to be Paid, Year Two	0
Other Commitment, to be Paid, Year Three	0
Other Commitment, to be Paid, Year Four	0
Other Commitment, to be Paid, Year Five	0
Other Commitment, to be Paid, after Year Five	0
Surety Bond [Member] \| Pepco Holdings LLC [Member]
Guarantor Obligations [Line Items]
Other Commitment	96
Other Commitments, Due in Next Twelve Months	96
Other Commitment, to be Paid, Year Two	0
Other Commitment, to be Paid, Year Three	0
Other Commitment, to be Paid, Year Four	0
Other Commitment, to be Paid, Year Five	0
Other Commitment, to be Paid, after Year Five	0
Surety Bond [Member] \| Potomac Electric Power Company [Member]
Guarantor Obligations [Line Items]
Other Commitment	84
Other Commitments, Due in Next Twelve Months	84
Other Commitment, to be Paid, Year Two	0
Other Commitment, to be Paid, Year Three	0
Other Commitment, to be Paid, Year Four	0
Other Commitment, to be Paid, Year Five	0
Other Commitment, to be Paid, after Year Five	0
Surety Bond [Member] \| Delmarva Power & Light Company [Member]
Guarantor Obligations [Line Items]
Other Commitment	7
Other Commitments, Due in Next Twelve Months	7
Other Commitment, to be Paid, Year Two	0
Other Commitment, to be Paid, Year Three	0
Other Commitment, to be Paid, Year Four	0
Other Commitment, to be Paid, Year Five	0
Other Commitment, to be Paid, after Year Five	0
Surety Bond [Member] \| Atlantic City Electric Company [Member]
Guarantor Obligations [Line Items]
Other Commitment	5
Other Commitments, Due in Next Twelve Months	5
Other Commitment, to be Paid, Year Two	0
Other Commitment, to be Paid, Year Three	0
Other Commitment, to be Paid, Year Four	0
Other Commitment, to be Paid, Year Five	0
Other Commitment, to be Paid, after Year Five	0
Guarantee of Indebtedness of Others [Member]
Guarantor Obligations [Line Items]
Other Commitment	378
Other Commitments, Due in Next Twelve Months	0
Other Commitment, to be Paid, Year Two	0
Other Commitment, to be Paid, Year Three	0
Other Commitment, to be Paid, Year Four	0
Other Commitment, to be Paid, Year Five	0
Other Commitment, to be Paid, after Year Five	378
Guarantee of Indebtedness of Others [Member] \| Commonwealth Edison Co [Member]
Guarantor Obligations [Line Items]
Other Commitment	200
Other Commitments, Due in Next Twelve Months	0
Other Commitment, to be Paid, Year Two	0
Other Commitment, to be Paid, Year Three	0
Other Commitment, to be Paid, Year Four	0
Other Commitment, to be Paid, Year Five	0
Other Commitment, to be Paid, after Year Five	200
Guarantee of Indebtedness of Others [Member] \| PECO Energy Co [Member]
Guarantor Obligations [Line Items]
Other Commitment	178
Other Commitments, Due in Next Twelve Months	0
Other Commitment, to be Paid, Year Two	0
Other Commitment, to be Paid, Year Three	0
Other Commitment, to be Paid, Year Four	0
Other Commitment, to be Paid, Year Five	0
Other Commitment, to be Paid, after Year Five	178
Guarantee Obligations [Member]
Guarantor Obligations [Line Items]
Other Commitment	29
Other Commitments, Due in Next Twelve Months	0
Other Commitment, to be Paid, Year Two	6
Other Commitment, to be Paid, Year Three	6
Other Commitment, to be Paid, Year Four	5
Other Commitment, to be Paid, Year Five	4
Other Commitment, to be Paid, after Year Five	8
Guarantee Obligations [Member] \| Pepco Holdings LLC [Member]
Guarantor Obligations [Line Items]
Other Commitment	29
Other Commitments, Due in Next Twelve Months	0
Other Commitment, to be Paid, Year Two	6
Other Commitment, to be Paid, Year Three	6
Other Commitment, to be Paid, Year Four	5
Other Commitment, to be Paid, Year Five	4
Other Commitment, to be Paid, after Year Five	8
Guarantee Obligations [Member] \| Potomac Electric Power Company [Member]
Guarantor Obligations [Line Items]
Other Commitment	10
Other Commitments, Due in Next Twelve Months	0
Other Commitment, to be Paid, Year Two	2
Other Commitment, to be Paid, Year Three	2
Other Commitment, to be Paid, Year Four	2
Other Commitment, to be Paid, Year Five	1
Other Commitment, to be Paid, after Year Five	3
Guarantee Obligations [Member] \| Delmarva Power & Light Company [Member]
Guarantor Obligations [Line Items]
Other Commitment	12
Other Commitments, Due in Next Twelve Months	0
Other Commitment, to be Paid, Year Two	3
Other Commitment, to be Paid, Year Three	2
Other Commitment, to be Paid, Year Four	2
Other Commitment, to be Paid, Year Five	2
Other Commitment, to be Paid, after Year Five	3
Guarantee Obligations [Member] \| Atlantic City Electric Company [Member]
Guarantor Obligations [Line Items]
Other Commitment	7
Other Commitments, Due in Next Twelve Months	0
Other Commitment, to be Paid, Year Two	1
Other Commitment, to be Paid, Year Three	2
Other Commitment, to be Paid, Year Four	1
Other Commitment, to be Paid, Year Five	1
Other Commitment, to be Paid, after Year Five	$ 2
Minimum [Member]
Guarantor Obligations [Line Items]
Lessor, Operating Lease, Term of Contract	1 year
Minimum [Member] \| Commonwealth Edison Co [Member]
Guarantor Obligations [Line Items]
Lessor, Operating Lease, Term of Contract	1 year
Minimum [Member] \| PECO Energy Co [Member]
Guarantor Obligations [Line Items]
Lessor, Operating Lease, Term of Contract	1 year
Minimum [Member] \| Baltimore Gas and Electric Company [Member]
Guarantor Obligations [Line Items]
Lessor, Operating Lease, Term of Contract	20 years
Minimum [Member] \| Pepco Holdings LLC [Member]
Guarantor Obligations [Line Items]
Lessor, Operating Lease, Term of Contract	1 year
Minimum [Member] \| Potomac Electric Power Company [Member]
Guarantor Obligations [Line Items]
Lessor, Operating Lease, Term of Contract	1 year
Minimum [Member] \| Delmarva Power & Light Company [Member]
Guarantor Obligations [Line Items]
Lessor, Operating Lease, Term of Contract	9 years
Minimum [Member] \| Guarantee Obligations [Member]
Guarantor Obligations [Line Items]
Lessor, Operating Lease, Term of Contract	1 year
Maximum [Member]
Guarantor Obligations [Line Items]
Lessor, Operating Lease, Term of Contract	80 years
Maximum [Member] \| Commonwealth Edison Co [Member]
Guarantor Obligations [Line Items]
Lessor, Operating Lease, Term of Contract	14 years
Maximum [Member] \| PECO Energy Co [Member]
Guarantor Obligations [Line Items]
Lessor, Operating Lease, Term of Contract	80 years
Maximum [Member] \| Baltimore Gas and Electric Company [Member]
Guarantor Obligations [Line Items]
Lessor, Operating Lease, Term of Contract	20 years
Maximum [Member] \| Pepco Holdings LLC [Member]
Guarantor Obligations [Line Items]
Lessor, Operating Lease, Term of Contract	10 years
Maximum [Member] \| Potomac Electric Power Company [Member]
Guarantor Obligations [Line Items]
Lessor, Operating Lease, Term of Contract	3 years
Maximum [Member] \| Delmarva Power & Light Company [Member]
Guarantor Obligations [Line Items]
Lessor, Operating Lease, Term of Contract	10 years
Maximum [Member] \| Guarantee Obligations [Member]
Guarantor Obligations [Line Items]
Lessor, Operating Lease, Term of Contract	8 years

Commitments and Contingencies_5

Commitments and Contingencies - Settlement Agreements (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Guarantor Obligations [Line Items]
Receivable related to Regulatory Agreement Units	$ 2,897	$ 0

Commitments and Contingencies_6

Commitments and Contingencies - Schedule of Environmental Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Loss Contingencies [Line Items]
Accrual for Environmental Loss Contingencies, Gross	$ 409	$ 352
Commonwealth Edison Co [Member]
Loss Contingencies [Line Items]
Accrual for Environmental Loss Contingencies, Gross	325	279
PECO Energy Co [Member]
Loss Contingencies [Line Items]
Accrual for Environmental Loss Contingencies, Gross	25	22
Baltimore Gas and Electric Company [Member]
Loss Contingencies [Line Items]
Accrual for Environmental Loss Contingencies, Gross	9	6
Pepco Holdings LLC [Member]
Loss Contingencies [Line Items]
Accrual for Environmental Loss Contingencies, Gross	46	42
Potomac Electric Power Company [Member]
Loss Contingencies [Line Items]
Accrual for Environmental Loss Contingencies, Gross	44	40
Delmarva Power & Light Company [Member]
Loss Contingencies [Line Items]
Accrual for Environmental Loss Contingencies, Gross	1	1
Atlantic City Electric Company [Member]
Loss Contingencies [Line Items]
Accrual for Environmental Loss Contingencies, Gross	1	1
Accrual For MGP Investigation And Remediation [Member]
Loss Contingencies [Line Items]
Accrual for Environmental Loss Contingencies, Gross	355	303
Accrual For MGP Investigation And Remediation [Member] \| Commonwealth Edison Co [Member]
Loss Contingencies [Line Items]
Accrual for Environmental Loss Contingencies, Gross	324	279
Accrual For MGP Investigation And Remediation [Member] \| PECO Energy Co [Member]
Loss Contingencies [Line Items]
Accrual for Environmental Loss Contingencies, Gross	23	20
Accrual For MGP Investigation And Remediation [Member] \| Baltimore Gas and Electric Company [Member]
Loss Contingencies [Line Items]
Accrual for Environmental Loss Contingencies, Gross	8	4
Accrual For MGP Investigation And Remediation [Member] \| Pepco Holdings LLC [Member]
Loss Contingencies [Line Items]
Accrual for Environmental Loss Contingencies, Gross	0	0
Accrual For MGP Investigation And Remediation [Member] \| Potomac Electric Power Company [Member]
Loss Contingencies [Line Items]
Accrual for Environmental Loss Contingencies, Gross	0	0
Accrual For MGP Investigation And Remediation [Member] \| Delmarva Power & Light Company [Member]
Loss Contingencies [Line Items]
Accrual for Environmental Loss Contingencies, Gross	0	0
Accrual For MGP Investigation And Remediation [Member] \| Atlantic City Electric Company [Member]
Loss Contingencies [Line Items]
Accrual for Environmental Loss Contingencies, Gross	$ 0	$ 0

Shareholders' Equity - Narrativ

Shareholders' Equity - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions			3 Months Ended	12 Months Ended
	Oct. 11, 2022	Aug. 11, 2022	Sep. 30, 2022	Dec. 31, 2022	Aug. 04, 2022
Stock Issued During Period, Shares, New Issues				12,995,000
Share Price					$ 43.32
Proceeds from Issuance or Sale of Equity			$ 563
Proceeds from (Repayments of) Debt		$ 575
Equity Distribution Agreement					$ 1,000
Schedule of Capitalization, Equity [Line Items]
Stock Repurchase Program, Number of Shares Authorized to be Repurchased				0
Corporate, Non-Segment [Member]
Proceeds from (Repayments of) Debt	$ 575	$ 575
Corporate, Non-Segment [Member] \| ShortTermDebtSOFRplus075Jan2023
Short-Term Loans			$ 1,150	$ 1,150
Initial Equity Securities Offering
Stock Issued During Period, Shares, New Issues			11,300,000
Additional Equity Securities Offering
Stock Issued During Period, Shares, New Issues			1,695,000

Shareholders' Equity - Schedule

Shareholders' Equity - Schedule of Common Stock Warrants (Details) - Commonwealth Edison Co [Member] - shares	Dec. 31, 2022	Dec. 31, 2021
Class of Warrant or Right [Line Items]
Class of Warrant or Right, Outstanding	60,052	60,061
Common Stock [Member]
Class of Warrant or Right [Line Items]
Common Stock Shares Reserved For Warrant Conversion	20,017	20,020

Shareholders' Equity - Schedu_2

Shareholders' Equity - Schedule of Preferred Stock (Details) - shares	Dec. 31, 2022	Dec. 31, 2021
Preferred Stock [Member]
Class of Stock [Line Items]
Preferred Stock, Shares Outstanding	0	0
Preferred Stock, Shares Authorized	100,000,000	100,000,000
Preferred Stock [Member] \| Commonwealth Edison Co [Member]
Class of Stock [Line Items]
Preferred Stock, Shares Outstanding	0	0
Preferred Stock, Shares Authorized	850,000	850,000
Preferred Stock [Member] \| PECO Energy Co [Member]
Class of Stock [Line Items]
Preferred Stock, Shares Outstanding	0	0
Preferred Stock, Shares Authorized	15,000,000	15,000,000
Preferred Stock [Member] \| Baltimore Gas and Electric Company [Member]
Class of Stock [Line Items]
Preferred Stock, Shares Outstanding	0	0
Preferred Stock, Shares Authorized	1,000,000	1,000,000
Preferred Stock [Member] \| Potomac Electric Power Company [Member]
Class of Stock [Line Items]
Preferred Stock, Shares Outstanding	0	0
Preferred Stock, Shares Authorized	6,000,000	6,000,000
Preferred Stock [Member] \| Atlantic City Electric Company [Member]
Class of Stock [Line Items]
Preferred Stock, Shares Outstanding	0	0
Preferred Stock, Shares Authorized	2,799,979	2,799,979
Preferred Stock [Member] \| Delmarva Power & Light Company [Member]
Class of Stock [Line Items]
Preferred Stock, Shares Authorized	0
Cumulative Preferred Stock [Member] \| Atlantic City Electric Company [Member]
Class of Stock [Line Items]
Preferred Stock, Shares Authorized	799,979	799,979
No-Par Preferred Stock [Member] \| Atlantic City Electric Company [Member]
Class of Stock [Line Items]
Preferred Stock, Shares Authorized	2,000,000	2,000,000

Shareholders' Equity - Schedu_3

Shareholders' Equity - Schedule of Preference Stock (Details) - shares	Dec. 31, 2022	Dec. 31, 2021
Class of Stock [Line Items]
Preference Stock, Shares Authorized	0
Commonwealth Edison Co [Member]
Class of Stock [Line Items]
Preference Stock, Shares Outstanding	0	0
Preference Stock, Shares Authorized	6,810,451	6,810,451
Baltimore Gas and Electric Company [Member]
Class of Stock [Line Items]
Preference Stock, Shares Outstanding	0	0
Preference Stock, Shares Authorized	6,500,000	6,500,000
Atlantic City Electric Company [Member]
Class of Stock [Line Items]
Preference Stock, Shares Outstanding	0	0
Preference Stock, Shares Authorized	3,000,000	3,000,000
PECO Energy Co [Member]
Class of Stock [Line Items]
Preference Stock, Shares Authorized	0
Potomac Electric Power Company [Member]
Class of Stock [Line Items]
Preference Stock, Shares Authorized	0
Delmarva Power & Light Company [Member]
Class of Stock [Line Items]
Preference Stock, Shares Authorized	0
Unclassified Preference Stock [Member] \| Baltimore Gas and Electric Company [Member]
Class of Stock [Line Items]
Preference Stock, Shares Authorized	4,600,000	4,600,000
Preference Stock Redeemed [Member] \| Baltimore Gas and Electric Company [Member]
Class of Stock [Line Items]
Preference Stock, Shares Authorized	1,900,000	1,900,000

Stock-Based Compensation Plan_3

Stock-Based Compensation Plans - Narrative (Details) shares in Millions	12 Months Ended
	Dec. 31, 2022 shares
Performance Shares [Member]
Common Stock Narrative Information [Line Items]
Percentage to be settled as common stock	50%
Percentage to be settled as cash	50%
Percentage to be settled as cash if ownership requirements are met	100%
Vesting period	3 years
Minimum [Member] \| Restricted Stock Units (RSUs) [Member]
Common Stock Narrative Information [Line Items]
Requisite service period	3 years
Maximum [Member] \| Restricted Stock Units (RSUs) [Member]
Common Stock Narrative Information [Line Items]
Requisite service period	5 years
LTIP [Member]
Common Stock Narrative Information [Line Items]
Shares authorized	34

Stock-Based Compensation Plan_4

Stock-Based Compensation Plans - Schedule of Stock-based Compensation Expense (Details) - Share-based Payment Arrangement [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Payment Arrangement, Expense	$ 41	$ 95	$ 37
Share-based Payment Arrangement, Expense, Tax Benefit	(10)	(25)	(9)
Share-based Payment Arrangement, Expense, after Tax	$ 31	$ 70	$ 28

Stock-Based Compensation Plan_5

Stock-Based Compensation Plans - Components of Tax Benefits from Stock-based Compensation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Performance Shares [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Tax benefit on stock compensation	$ 6	$ 6	$ 15
Restricted Stock Units (RSUs) [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Tax benefit on stock compensation	$ 6	$ 6	$ 8

Stock-Based Compensation Plan_6

Stock-Based Compensation Plans - Summary of Performance Share Awards Activity (Details) - Performance Shares [Member] - $ / shares	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Beginning Balance	1,222,516
Granted	727,697
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Period Increase (Decrease)	(216,981)
Vested	(233,318)
Forfeited	(86,128)
Share-Based Compensation Arrangement by Share-Based Payment Award, Other Share Increase (Decrease)	(2,308,745)
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized	1,870,990
Undistributed vested awards	(109,226)
Ending Balance	866,805	1,222,516
Nonvested, Weighted Average Exercise Price (in usd per share)	$ 41.86	$ 44.96
Granted, Weighted Average Grant Date Fair Value (in usd per share)	43.05	$ 43.37	$ 46.61
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Change in Performance, Weighted Average Grant Date Fair Value	42.73
Vested, Weighted Average Exercise Price (in usd per share)	47.39
Forfeited, Weighted Average Exercise Price (in usd per share)	42.61
Undistributed Vested Awards, Weighted Average Grant Date Fair Value (in usd per share)	$ 4.55
Fully Vested Stock Based Compensation Issued To Retirement Eligible Employees	1,539,819	1,934,238

Stock-Based Compensation Plan_7

Stock-Based Compensation Plans - Summary of Weighted Average Fair Value (Details) - Performance Shares [Member] - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, Weighted Average Grant Date Fair Value (in usd per share)	$ 43.05	$ 43.37	$ 46.61
Fair Value Of Settled Performance Share Awards	$ 29	$ 44	$ 39
Performance Share Awards Obligations Settled In Cash	25	$ 28	$ 63
Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount	$ 12
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition	1 year 9 months 18 days

Stock-Based Compensation Plan_8

Stock-Based Compensation Plans - Summary of Nonvested Restricted Stock Unit Activity (Details) - Restricted Stock Units (RSUs) [Member] - $ / shares	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Beginning Balance	1,142,049
Granted	468,514
Vested	(499,621)
Forfeited	(71,816)
Share-Based Compensation Arrangement by Share-Based Payment Award, Other Share Increase (Decrease)	(943,509)
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized	643,994
Undistributed vested awards	(178,450)
Ending Balance	561,161	1,142,049
Nonvested, Weighted Average Exercise Price (in usd per share)	$ 41.98	$ 43.52
Granted, Weighted Average Grant Date Fair Value (in usd per share)	42.97	$ 44.21	$ 46.33
Vested, Weighted Average Exercise Price (in usd per share)	42.28
Forfeited, Weighted Average Exercise Price (in usd per share)	41.89
Undistributed Vested Awards, Weighted Average Grant Date Fair Value (in usd per share)	$ 38.24
Fully Vested Stock Based Compensation Issued To Retirement Eligible Employees	476,592	609,934

Stock-Based Compensation Plan_9

Stock-Based Compensation Plans - Summary of Weighted Average Restricted Stock Unit Activity (Details) - Restricted Stock Units (RSUs) [Member] - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, Weighted Average Grant Date Fair Value (in usd per share)	$ 42.97	$ 44.21	$ 46.33
Fair Value Of Settled Restricted Stock Units	$ 23	$ 34	$ 54
Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount	$ 11
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition	1 year 10 months 24 days

Stock-Based Compensation Pla_10

Stock-Based Compensation Plans - Summary of Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Aggregate value	$ 0	$ 11	$ 5
Share-based Payment Arrangement, Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Beginning Balance	27,007
Options exercised	(27,644)
Options expired	0
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Other Increases (Decreases) in Period	(2,000)
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Number of Shares, Period Increase (Decrease)	2,637
Ending Balance	0	27,007
Shares Exercisable, Aggregate Intrinsic Value	$ 0
Shares Exercisable, Weighted Average Remaining Contractual Life	0 years
Shares Exercisable, Weighted Average Exercise Price (in usd per share)	$ 0
Exercisable at December 31, 2022	0
Weighted Average Exercise Price (in usd per share)	$ 0	$ 46.47
Options Exercised, Weighted Average Exercise Price (in usd per share)	38.56
Options Expired, Weighted Average Exercise Price (in usd per share)	$ 0
Shares Outstanding, Weighted Average Remaining Contractual Life	0 years	1 month 24 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value	$ 0	$ 0
Aggregate value	$ 0

Stock-Based Compensation Pla_11

Stock-Based Compensation Plans - Summary of Stock Option Exercised (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate value	$ 0	$ 11	$ 5
Cash received for exercise price	$ 1	$ 37	$ 18

Changes in Accumulated Other _3

Changes in Accumulated Other Comprehensive Income - Schedule of Changes in AOCI (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Movement in Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	$ 34,795	$ 34,868	$ 34,573
Other Comprehensive Income (Loss), Net of Tax	89	650	(206)
Ending Balance	24,744	34,795	34,868
Cash Flow Hedges
Movement in Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	(6)	(5)	(2)
OCI before reclassifications	2	(1)	(3)
Amounts reclassified from AOCI	0	0	0
Other Comprehensive Income (Loss), Net of Tax	2	(1)	(3)
Ending Balance	2	(6)	(5)
Cash Flow Hedges \| Exelon Generation Co L L C [Member]
Movement in Accumulated Other Comprehensive Income [Roll Forward]
Other Comprehensive Income (Loss), Net of Tax	6
Pension and Non-Pension Postretirement Benefit Plan Items (a)
Movement in Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	(2,721)	(3,372)	(3,165)
OCI before reclassifications	46	432	(357)
Amounts reclassified from AOCI	41	219	150
Other Comprehensive Income (Loss), Net of Tax	87	651	(207)
Ending Balance	(640)	(2,721)	(3,372)
Pension and Non-Pension Postretirement Benefit Plan Items (a) \| Exelon Generation Co L L C [Member]
Movement in Accumulated Other Comprehensive Income [Roll Forward]
Other Comprehensive Income (Loss), Net of Tax	1,994
Foreign Currency Items
Movement in Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	(23)	(23)	(27)
OCI before reclassifications	0	0	4
Amounts reclassified from AOCI	0	0	0
Other Comprehensive Income (Loss), Net of Tax	0	0	4
Ending Balance	0	(23)	(23)
Foreign Currency Items \| Exelon Generation Co L L C [Member]
Movement in Accumulated Other Comprehensive Income [Roll Forward]
Other Comprehensive Income (Loss), Net of Tax	23
Total
Movement in Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	(2,750)	(3,400)	(3,194)
OCI before reclassifications	48	431	(356)
Amounts reclassified from AOCI	41	219	150
Other Comprehensive Income (Loss), Net of Tax	89	650	(206)
Ending Balance	(638)	$ (2,750)	$ (3,400)
Total \| Exelon Generation Co L L C [Member]
Movement in Accumulated Other Comprehensive Income [Roll Forward]
Other Comprehensive Income (Loss), Net of Tax	$ 2,023

Changes in Accumulated Other _4

Changes in Accumulated Other Comprehensive Income - Income Taxes Allocated to Other Comprehensive Income (Loss) Components (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Prior service costs
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), Tax	$ 0	$ 4	$ 16
Actuarial losses
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), Tax	(14)	(76)	(66)
Pension and Non-Pension Postretirement Benefit Plan Items (a)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), Tax	$ (14)	$ (153)	$ 122

Supplemental Financial Inform_3

Supplemental Financial Information - Summary of Taxes other than income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Supplemental Statement of Operations Information [Line Items]
Utility	$ 878	$ 774	$ 759
Property	377	364	336
Payroll	117	124	121
Commonwealth Edison Co [Member]
Supplemental Statement of Operations Information [Line Items]
Utility	306	246	238
Property	31	39	30
Payroll	28	27	27
PECO Energy Co [Member]
Supplemental Statement of Operations Information [Line Items]
Utility	166	139	135
Property	17	18	16
Payroll	16	16	16
Baltimore Gas and Electric Company [Member]
Supplemental Statement of Operations Information [Line Items]
Utility	94	88	87
Property	191	176	164
Payroll	17	18	17
Pepco Holdings LLC [Member]
Supplemental Statement of Operations Information [Line Items]
Utility	312	301	299
Property	138	131	126
Payroll	25	27	25
Potomac Electric Power Company [Member]
Supplemental Statement of Operations Information [Line Items]
Utility	283	278	275
Property	94	88	84
Payroll	6	7	7
Delmarva Power & Light Company [Member]
Supplemental Statement of Operations Information [Line Items]
Utility	25	22	21
Property	42	40	39
Payroll	4	5	5
Atlantic City Electric Company [Member]
Supplemental Statement of Operations Information [Line Items]
Utility	4	3	3
Property	2	3	3
Payroll	$ 3	$ 3	$ 3

Supplemental Financial Inform_4

Supplemental Financial Information - Summary of Other Income (Expense) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Other, Net [Abstract]
AFUDC—Equity	$ 150	$ 136	$ 104
Non-service net periodic benefit cost	63	91	53
Unrealized Gain (Loss) on Investments	(16)	(160)	186
Commonwealth Edison Co [Member]
Other, Net [Abstract]
AFUDC—Equity	35	34	29
Non-service net periodic benefit cost	0	0	0
PECO Energy Co [Member]
Other, Net [Abstract]
AFUDC—Equity	31	26	17
Non-service net periodic benefit cost	0	0	0
Baltimore Gas and Electric Company [Member]
Other, Net [Abstract]
AFUDC—Equity	21	27	22
Non-service net periodic benefit cost	0	0	0
Pepco Holdings LLC [Member]
Other, Net [Abstract]
AFUDC—Equity	63	49	36
Non-service net periodic benefit cost	0	0	0
Potomac Electric Power Company [Member]
Other, Net [Abstract]
AFUDC—Equity	48	40	28
Non-service net periodic benefit cost	0	0	0
Delmarva Power & Light Company [Member]
Other, Net [Abstract]
AFUDC—Equity	7	6	4
Non-service net periodic benefit cost	0	0	0
Atlantic City Electric Company [Member]
Other, Net [Abstract]
AFUDC—Equity	8	3	4
Non-service net periodic benefit cost	$ 0	$ 0	$ 0

Supplemental Financial Inform_5

Supplemental Financial Information - Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Depreciation, amortization and accretion
Depreciation	$ 2,690	$ 5,384	$ 4,364
Amortization of Regulatory Asset	718	594	588
Amortization of Intangible Assets	(182)	(83)	(98)
Amortization of Nuclear Fuel Lease	66	992	983
Accretion expense	44	514	500
Total depreciation, amortization and accretion	3,533	7,573	6,527
Cash paid (refunded) during the year:
Interest (net of amount capitalized)	1,434	1,505	1,521
Income taxes (net of refunds)	73	281	10
Other non-cash operating activities:
Pension and non-pension postretirement benefit costs	164	411	411
Provision for uncollectible accounts	173	160	150
Other decommissioning related-activity	36	(946)	(659)
Energy-related options	60	125	104
True-up Adjustments to Decoupling Mechanisms and Formula Rate	(161)	(171)	(6)
Restructuring Costs		(57)	105
Long-term incentive plan	42	137	56
Operating Leases, Income Statement, Depreciation Expense on Property Subject to or Held-for-lease	56	183	222
Public Utilities, Allowance for Funds Used During Construction, Capitalized Cost of Equity	(150)	(136)	(104)
Inventory Write-down			131
Asset impairments	48	552	591
Change in environmental liabilities			0
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]
Cash and cash equivalents	407	672	432	$ 587
Restricted cash	566	321	349	358
Restricted cash included in other long-term assets	117	44	53	177
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Disposal Group, Including Discontinued Operations		582	332
Total cash, cash equivalents and restricted cash	1,090	1,619	1,166	1,122
Other Non-Cash [Member]
Other non-cash operating activities:
True-up Adjustments to Decoupling Mechanisms and Formula Rate	(168)	(171)	(6)
Return on borrowed funds
Other non-cash operating activities:
Public Utilities, Allowance for Funds Used During Construction, Capitalized Cost of Equity	(150)	(136)	(104)
Commonwealth Edison Co [Member]
Depreciation, amortization and accretion
Depreciation	1,031	970	922
Amortization of Regulatory Asset	292	235	211
Amortization of Nuclear Fuel Lease	0	0	0
Accretion expense	0	0	0
Total depreciation, amortization and accretion	1,323	1,205	1,133
Cash paid (refunded) during the year:
Interest (net of amount capitalized)	396	372	371
Income taxes (net of refunds)	23	(72)	(61)
Other non-cash operating activities:
Pension and non-pension postretirement benefit costs	60	129	114
Provision for uncollectible accounts	46	47	32
Other decommissioning related-activity	0	0	0
Energy-related options	0	0	0
True-up Adjustments to Decoupling Mechanisms and Formula Rate	(267)	(42)	47
Restructuring Costs		2	1
Long-term incentive plan	0	0	0
Operating Leases, Income Statement, Depreciation Expense on Property Subject to or Held-for-lease	2	1	2
Public Utilities, Allowance for Funds Used During Construction, Capitalized Cost of Equity	(35)	(34)	(29)
Inventory Write-down			2
Change in environmental liabilities			15
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]
Cash and cash equivalents	67	131	83	90
Restricted cash	327	210	279	150
Restricted cash included in other long-term assets	117	43	43	163
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Disposal Group, Including Discontinued Operations		0	0
Total cash, cash equivalents and restricted cash	511	384	405	403
Commonwealth Edison Co [Member] \| Other Non-Cash [Member]
Other non-cash operating activities:
True-up Adjustments to Decoupling Mechanisms and Formula Rate	(267)	(42)	47
Commonwealth Edison Co [Member] \| Return on borrowed funds
Other non-cash operating activities:
Public Utilities, Allowance for Funds Used During Construction, Capitalized Cost of Equity	(35)	(34)	(29)
PECO Energy Co [Member]
Depreciation, amortization and accretion
Depreciation	359	336	319
Amortization of Regulatory Asset	14	12	28
Amortization of Nuclear Fuel Lease	0	0	0
Accretion expense	0	0	0
Total depreciation, amortization and accretion	373	348	347
Cash paid (refunded) during the year:
Interest (net of amount capitalized)	166	152	144
Income taxes (net of refunds)	31	(4)	(37)
Other non-cash operating activities:
Pension and non-pension postretirement benefit costs	(9)	8	5
Provision for uncollectible accounts	45	39	42
Other decommissioning related-activity	0	0	0
Energy-related options	0	0	0
True-up Adjustments to Decoupling Mechanisms and Formula Rate	(2)	(26)	(16)
Restructuring Costs		0	1
Long-term incentive plan	0	0	0
Operating Leases, Income Statement, Depreciation Expense on Property Subject to or Held-for-lease	0	0	1
Public Utilities, Allowance for Funds Used During Construction, Capitalized Cost of Equity	(31)	(26)	(17)
Inventory Write-down			1
Change in environmental liabilities			0
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]
Cash and cash equivalents	59	36	19	21
Restricted cash	9	8	7	6
Restricted cash included in other long-term assets	0	0	0	0
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Disposal Group, Including Discontinued Operations		0	0
Total cash, cash equivalents and restricted cash	68	44	26	27
PECO Energy Co [Member] \| Other Non-Cash [Member]
Other non-cash operating activities:
True-up Adjustments to Decoupling Mechanisms and Formula Rate	(2)	(26)	(16)
PECO Energy Co [Member] \| Return on borrowed funds
Other non-cash operating activities:
Public Utilities, Allowance for Funds Used During Construction, Capitalized Cost of Equity	(31)	(26)	(17)
Baltimore Gas and Electric Company [Member]
Depreciation, amortization and accretion
Depreciation	476	439	397
Amortization of Regulatory Asset	154	152	153
Amortization of Nuclear Fuel Lease	0	0	0
Accretion expense	0	0	0
Total depreciation, amortization and accretion	630	591	550
Cash paid (refunded) during the year:
Interest (net of amount capitalized)	147	134	125
Income taxes (net of refunds)	16	(38)	(57)
Other non-cash operating activities:
Pension and non-pension postretirement benefit costs	44	61	62
Provision for uncollectible accounts	25	17	15
Other decommissioning related-activity	0	0	0
Energy-related options	0	0	0
True-up Adjustments to Decoupling Mechanisms and Formula Rate	47	(12)	(16)
Restructuring Costs		0	0
Long-term incentive plan	0	0	0
Operating Leases, Income Statement, Depreciation Expense on Property Subject to or Held-for-lease	14	29	31
Public Utilities, Allowance for Funds Used During Construction, Capitalized Cost of Equity	(21)	(27)	(22)
Inventory Write-down			0
Asset impairments	48	0	0
Change in environmental liabilities			0
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]
Cash and cash equivalents	43	51	144	24
Restricted cash	24	4	1	1
Restricted cash included in other long-term assets	0	0	0	0
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Disposal Group, Including Discontinued Operations		0	0
Total cash, cash equivalents and restricted cash	67	55	145	25
Baltimore Gas and Electric Company [Member] \| Other Non-Cash [Member]
Other non-cash operating activities:
True-up Adjustments to Decoupling Mechanisms and Formula Rate	47	(12)	(16)
Baltimore Gas and Electric Company [Member] \| Return on borrowed funds
Other non-cash operating activities:
Public Utilities, Allowance for Funds Used During Construction, Capitalized Cost of Equity	(21)	(27)	(22)
Pepco Holdings LLC [Member]
Depreciation, amortization and accretion
Depreciation	680	627	586
Amortization of Regulatory Asset	258	194	196
Amortization of Intangible Assets	(190)	(92)	(115)
Amortization of Nuclear Fuel Lease	0	0	0
Accretion expense	0	0	0
Total depreciation, amortization and accretion	938	821	782
Cash paid (refunded) during the year:
Interest (net of amount capitalized)	274	255	257
Income taxes (net of refunds)	19	0	46
Other non-cash operating activities:
Pension and non-pension postretirement benefit costs	53	49	70
Provision for uncollectible accounts	58	24	43
Other decommissioning related-activity	0	0	0
Energy-related options	0	0	0
True-up Adjustments to Decoupling Mechanisms and Formula Rate	59	(91)	(21)
Restructuring Costs		1	0
Long-term incentive plan	0	0	0
Operating Leases, Income Statement, Depreciation Expense on Property Subject to or Held-for-lease	27	28	28
Public Utilities, Allowance for Funds Used During Construction, Capitalized Cost of Equity	(63)	(49)	(36)
Inventory Write-down			0
Change in environmental liabilities			13
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]
Cash and cash equivalents	198	136	111	131
Restricted cash	175	77	39	36
Restricted cash included in other long-term assets	0	0	10	14
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Disposal Group, Including Discontinued Operations		0	0
Total cash, cash equivalents and restricted cash	373	213	160	181
Pepco Holdings LLC [Member] \| Other Non-Cash [Member]
Other non-cash operating activities:
True-up Adjustments to Decoupling Mechanisms and Formula Rate	54	(91)	(21)
Pepco Holdings LLC [Member] \| Return on borrowed funds
Other non-cash operating activities:
Public Utilities, Allowance for Funds Used During Construction, Capitalized Cost of Equity	(63)	(49)	(36)
Potomac Electric Power Company [Member]
Depreciation, amortization and accretion
Depreciation	288	274	257
Amortization of Regulatory Asset	129	129	120
Amortization of Nuclear Fuel Lease	0	0	0
Accretion expense	0	0	0
Total depreciation, amortization and accretion	417	403	377
Cash paid (refunded) during the year:
Interest (net of amount capitalized)	141	132	129
Income taxes (net of refunds)	28	12	40
Other non-cash operating activities:
Pension and non-pension postretirement benefit costs	9	6	15
Provision for uncollectible accounts	29	9	24
Other decommissioning related-activity	0	0	0
Energy-related options	0	0	0
True-up Adjustments to Decoupling Mechanisms and Formula Rate	31	(53)	(40)
Restructuring Costs		0	0
Long-term incentive plan	0	0	0
Operating Leases, Income Statement, Depreciation Expense on Property Subject to or Held-for-lease	7	6	7
Public Utilities, Allowance for Funds Used During Construction, Capitalized Cost of Equity	(48)	(40)	(28)
Inventory Write-down			0
Change in environmental liabilities			0
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]
Cash and cash equivalents	45	34	30	30
Restricted cash	54	34	35	33
Restricted cash included in other long-term assets	0	0	0	0
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Disposal Group, Including Discontinued Operations		0	0
Total cash, cash equivalents and restricted cash	99	68	65	63
Potomac Electric Power Company [Member] \| Other Non-Cash [Member]
Other non-cash operating activities:
True-up Adjustments to Decoupling Mechanisms and Formula Rate	31	(53)	(40)
Potomac Electric Power Company [Member] \| Return on borrowed funds
Other non-cash operating activities:
Public Utilities, Allowance for Funds Used During Construction, Capitalized Cost of Equity	(48)	(40)	(28)
Delmarva Power & Light Company [Member]
Depreciation, amortization and accretion
Depreciation	191	169	155
Amortization of Regulatory Asset	41	41	36
Amortization of Nuclear Fuel Lease	0	0	0
Accretion expense	0	0	0
Total depreciation, amortization and accretion	232	210	191
Cash paid (refunded) during the year:
Interest (net of amount capitalized)	63	59	61
Income taxes (net of refunds)	(2)	(9)	12
Other non-cash operating activities:
Pension and non-pension postretirement benefit costs	3	2	7
Provision for uncollectible accounts	12	5	16
Other decommissioning related-activity	0	0	0
Energy-related options	0	0	0
True-up Adjustments to Decoupling Mechanisms and Formula Rate	9	(14)	7
Restructuring Costs		0	0
Long-term incentive plan	0	0	0
Operating Leases, Income Statement, Depreciation Expense on Property Subject to or Held-for-lease	8	8	8
Public Utilities, Allowance for Funds Used During Construction, Capitalized Cost of Equity	(7)	(6)	(4)
Inventory Write-down			0
Change in environmental liabilities			7
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]
Cash and cash equivalents	31	28	15	13
Restricted cash	121	43	0	0
Restricted cash included in other long-term assets	0	0	0	0
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Disposal Group, Including Discontinued Operations		0	0
Total cash, cash equivalents and restricted cash	152	71	15	13
Delmarva Power & Light Company [Member] \| Other Non-Cash [Member]
Other non-cash operating activities:
True-up Adjustments to Decoupling Mechanisms and Formula Rate	7	(14)	7
Delmarva Power & Light Company [Member] \| Return on borrowed funds
Other non-cash operating activities:
Public Utilities, Allowance for Funds Used During Construction, Capitalized Cost of Equity	(7)	(6)	(4)
Atlantic City Electric Company [Member]
Depreciation, amortization and accretion
Depreciation	173	155	140
Amortization of Regulatory Asset	88	24	40
Amortization of Nuclear Fuel Lease	0	0	0
Accretion expense	0	0	0
Total depreciation, amortization and accretion	261	179	180
Cash paid (refunded) during the year:
Interest (net of amount capitalized)	60	56	57
Income taxes (net of refunds)	(6)	2	(3)
Other non-cash operating activities:
Pension and non-pension postretirement benefit costs	12	11	14
Provision for uncollectible accounts	16	10	2
Other decommissioning related-activity	0	0	0
Energy-related options	0	0	0
True-up Adjustments to Decoupling Mechanisms and Formula Rate	19	(24)	12
Restructuring Costs		0	0
Long-term incentive plan	0	0	0
Operating Leases, Income Statement, Depreciation Expense on Property Subject to or Held-for-lease	3	4	3
Public Utilities, Allowance for Funds Used During Construction, Capitalized Cost of Equity	(8)	(3)	(4)
Inventory Write-down			0
Change in environmental liabilities			6
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]
Cash and cash equivalents	72	29	17	12
Restricted cash	0	0	3	2
Restricted cash included in other long-term assets	0	0	10	14
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Disposal Group, Including Discontinued Operations		0	0
Total cash, cash equivalents and restricted cash	72	29	30	$ 28
Atlantic City Electric Company [Member] \| Other Non-Cash [Member]
Other non-cash operating activities:
True-up Adjustments to Decoupling Mechanisms and Formula Rate	16	(24)	12
Atlantic City Electric Company [Member] \| Return on borrowed funds
Other non-cash operating activities:
Public Utilities, Allowance for Funds Used During Construction, Capitalized Cost of Equity	(8)	(3)	(4)
Other Intangible Assets [Member]
Depreciation, amortization and accretion
Amortization of Intangible Assets	12	58	62
Other Intangible Assets [Member] \| Commonwealth Edison Co [Member]
Depreciation, amortization and accretion
Amortization of Intangible Assets	0	0	0
Other Intangible Assets [Member] \| PECO Energy Co [Member]
Depreciation, amortization and accretion
Amortization of Intangible Assets	0	0	0
Other Intangible Assets [Member] \| Baltimore Gas and Electric Company [Member]
Depreciation, amortization and accretion
Amortization of Intangible Assets	0	0	0
Other Intangible Assets [Member] \| Pepco Holdings LLC [Member]
Depreciation, amortization and accretion
Amortization of Intangible Assets	0	0	0
Other Intangible Assets [Member] \| Potomac Electric Power Company [Member]
Depreciation, amortization and accretion
Amortization of Intangible Assets	0	0	0
Other Intangible Assets [Member] \| Delmarva Power & Light Company [Member]
Depreciation, amortization and accretion
Amortization of Intangible Assets	0	0	0
Other Intangible Assets [Member] \| Atlantic City Electric Company [Member]
Depreciation, amortization and accretion
Amortization of Intangible Assets	0	0	0
Unamortized Energy Contracts [Member]
Depreciation, amortization and accretion
Amortization of Power Contracts Emission Credits	3	31	30
Unamortized Energy Contracts [Member] \| Commonwealth Edison Co [Member]
Depreciation, amortization and accretion
Amortization of Power Contracts Emission Credits	0	0	0
Unamortized Energy Contracts [Member] \| PECO Energy Co [Member]
Depreciation, amortization and accretion
Amortization of Power Contracts Emission Credits	0	0	0
Unamortized Energy Contracts [Member] \| Baltimore Gas and Electric Company [Member]
Depreciation, amortization and accretion
Amortization of Power Contracts Emission Credits	0	0	0
Unamortized Energy Contracts [Member] \| Pepco Holdings LLC [Member]
Depreciation, amortization and accretion
Amortization of Power Contracts Emission Credits	0	0	0
Unamortized Energy Contracts [Member] \| Potomac Electric Power Company [Member]
Depreciation, amortization and accretion
Amortization of Power Contracts Emission Credits	0	0	0
Unamortized Energy Contracts [Member] \| Delmarva Power & Light Company [Member]
Depreciation, amortization and accretion
Amortization of Power Contracts Emission Credits	0	0	0
Unamortized Energy Contracts [Member] \| Atlantic City Electric Company [Member]
Depreciation, amortization and accretion
Amortization of Power Contracts Emission Credits	$ 0	$ 0	$ 0

Supplemental Financial Inform_6

Supplemental Financial Information - Supplemental Balance Sheet Information (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Investments [Abstract]
Total Investments	$ 232	$ 250
Accrued Expenses [Abstract]
Compensation-related accruals	613	596
Taxes accrued	211	253
Interest accrued	338	297
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Disposal Group, Including Discontinued Operations		582	$ 332
Other Equity Method Investments
Investments [Abstract]
Equity Method Investments	16	15
Employee benefit trusts and investments
Investments [Abstract]
Employee benefit trusts and investments	216	235
Commonwealth Edison Co [Member]
Investments [Abstract]
Total Investments	6	6
Accrued Expenses [Abstract]
Compensation-related accruals	179	155
Taxes accrued	92	94
Interest accrued	124	116
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Disposal Group, Including Discontinued Operations		0	0
Commonwealth Edison Co [Member] \| Other Equity Method Investments
Investments [Abstract]
Equity Method Investments	6	6
Commonwealth Edison Co [Member] \| Employee benefit trusts and investments
Investments [Abstract]
Employee benefit trusts and investments	0	0
PECO Energy Co [Member]
Investments [Abstract]
Total Investments	30	34
Accrued Expenses [Abstract]
Compensation-related accruals	81	77
Taxes accrued	10	14
Interest accrued	47	41
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Disposal Group, Including Discontinued Operations		0	0
PECO Energy Co [Member] \| Other Equity Method Investments
Investments [Abstract]
Equity Method Investments	8	7
PECO Energy Co [Member] \| Employee benefit trusts and investments
Investments [Abstract]
Employee benefit trusts and investments	22	27
Baltimore Gas and Electric Company [Member]
Investments [Abstract]
Total Investments	7	14
Accrued Expenses [Abstract]
Compensation-related accruals	79	78
Taxes accrued	34	53
Interest accrued	42	44
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Disposal Group, Including Discontinued Operations		0	0
Baltimore Gas and Electric Company [Member] \| Other Equity Method Investments
Investments [Abstract]
Equity Method Investments	0	0
Baltimore Gas and Electric Company [Member] \| Employee benefit trusts and investments
Investments [Abstract]
Employee benefit trusts and investments	7	14
Pepco Holdings LLC [Member]
Investments [Abstract]
Total Investments	138	145
Accrued Expenses [Abstract]
Compensation-related accruals	104	113
Taxes accrued	70	96
Interest accrued	61	52
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Disposal Group, Including Discontinued Operations		0	0
Pepco Holdings LLC [Member] \| Other Equity Method Investments
Investments [Abstract]
Equity Method Investments	0	0
Pepco Holdings LLC [Member] \| Employee benefit trusts and investments
Investments [Abstract]
Employee benefit trusts and investments	138	145
Potomac Electric Power Company [Member]
Investments [Abstract]
Total Investments	119	120
Accrued Expenses [Abstract]
Compensation-related accruals	29	35
Taxes accrued	52	88
Interest accrued	32	28
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Disposal Group, Including Discontinued Operations		0	0
Potomac Electric Power Company [Member] \| Other Equity Method Investments
Investments [Abstract]
Equity Method Investments	0	0
Potomac Electric Power Company [Member] \| Employee benefit trusts and investments
Investments [Abstract]
Employee benefit trusts and investments	119	120
Delmarva Power & Light Company [Member]
Accrued Expenses [Abstract]
Compensation-related accruals	20	20
Taxes accrued	8	9
Interest accrued	9	8
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Disposal Group, Including Discontinued Operations		0	0
Atlantic City Electric Company [Member]
Accrued Expenses [Abstract]
Compensation-related accruals	16	17
Taxes accrued	12	11
Interest accrued	$ 14	11
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Disposal Group, Including Discontinued Operations		$ 0	$ 0

Related Party Transactions - Na

Related Party Transactions - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($)
Related Party Transactions [Abstract]
Exelon Foundation Charitable Contribution	$ 20

Related Party Transactions - Op

Related Party Transactions - Operating Revenues and Purchased Power and Fuel From Affiliates (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Related Party Transaction [Line Items]
Related Party Transaction, Purchases from Related Party	$ (159)	$ (1,178)	$ (1,209)
Exelon Generation Co L L C [Member] \| Commonwealth Edison Co Affiliate [Member]
Related Party Transaction [Line Items]
Revenue from Related Parties	59	376	330
Exelon Generation Co L L C [Member] \| PECO Energy Co Affiliate [Member]
Related Party Transaction [Line Items]
Revenue from Related Parties	33	196	190
Exelon Generation Co L L C [Member] \| Baltimore Gas And Electric Company Affiliate [Member]
Related Party Transaction [Line Items]
Revenue from Related Parties	18	236	315
Exelon Generation Co L L C [Member] \| Pepco Holdings LLC Affiliate [Member]
Related Party Transaction [Line Items]
Revenue from Related Parties	51	366	367
Exelon Generation Co L L C [Member] \| Potomac Electric Power Co Affiliate [Member]
Related Party Transaction [Line Items]
Revenue from Related Parties	39	270	279
Exelon Generation Co L L C [Member] \| Delmarva Power and Light Co Affiliate [Member]
Related Party Transaction [Line Items]
Revenue from Related Parties	10	79	75
Exelon Generation Co L L C [Member] \| Atlantic City Electric Co Affiliate [Member]
Related Party Transaction [Line Items]
Revenue from Related Parties	2	17	13
Commonwealth Edison Co [Member]
Related Party Transaction [Line Items]
Revenue from Related Parties	16	41	37
Related Party Transaction, Purchases from Related Party	$ (59)	$ (383)	$ (345)

Related Party Transactions - BS

Related Party Transactions - BSC and PHISCO Service Companies (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Exelon Business Services Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction Capitalized Costs Support Services	$ 707	$ 508	$ 531
PHI Service Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction Capitalized Costs Support Services	80	72	61
Commonwealth Edison Co [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Expenses from Transactions with Related Party	318	307	289
Commonwealth Edison Co [Member] \| Exelon Business Services Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Expenses from Transactions with Related Party	316	304	283
Related Party Transaction Capitalized Costs Support Services	311	207	186
PECO Energy Co [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Expenses from Transactions with Related Party	201	177	159
PECO Energy Co [Member] \| Exelon Business Services Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Expenses from Transactions with Related Party	197	169	150
Related Party Transaction Capitalized Costs Support Services	115	81	76
Baltimore Gas and Electric Company [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Expenses from Transactions with Related Party	207	193	172
Baltimore Gas and Electric Company [Member] \| Exelon Business Services Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Expenses from Transactions with Related Party	204	189	170
Related Party Transaction Capitalized Costs Support Services	122	92	132
Pepco Holdings LLC [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Expenses from Transactions with Related Party	191	179	159
Pepco Holdings LLC [Member] \| Exelon Business Services Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Expenses from Transactions with Related Party	188	168	152
Related Party Transaction Capitalized Costs Support Services	159	128	149
Pepco Holdings LLC [Member] \| PHI Service Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Expenses from Transactions with Related Party	0	0	0
Related Party Transaction Capitalized Costs Support Services	80	72	61
Potomac Electric Power Company [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Expenses from Transactions with Related Party	223	213	205
Potomac Electric Power Company [Member] \| Exelon Business Services Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Expenses from Transactions with Related Party	110	96	85
Related Party Transaction Capitalized Costs Support Services	60	50	55
Potomac Electric Power Company [Member] \| PHI Service Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Expenses from Transactions with Related Party	112	114	120
Related Party Transaction Capitalized Costs Support Services	33	31	27
Delmarva Power & Light Company [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Expenses from Transactions with Related Party	166	162	153
Delmarva Power & Light Company [Member] \| Exelon Business Services Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Expenses from Transactions with Related Party	71	61	54
Related Party Transaction Capitalized Costs Support Services	45	43	51
Delmarva Power & Light Company [Member] \| PHI Service Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Expenses from Transactions with Related Party	96	99	97
Related Party Transaction Capitalized Costs Support Services	26	22	18
Atlantic City Electric Company [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Expenses from Transactions with Related Party	142	141	134
Atlantic City Electric Company [Member] \| Exelon Business Services Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Expenses from Transactions with Related Party	57	53	45
Related Party Transaction Capitalized Costs Support Services	54	33	40
Atlantic City Electric Company [Member] \| PHI Service Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Expenses from Transactions with Related Party	84	86	87
Related Party Transaction Capitalized Costs Support Services	$ 21	$ 19	$ 16

Related Party Transactions - Cu

Related Party Transactions - Current Receivables From/Payables To Affiliates (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Related Party Transaction [Line Items]
Accounts Payable, Related Parties, Current	$ 5	$ 5
Related Party Transaction, Due from (to) Related Party, Current	255	523
Exelon Generation Co L L C [Member]
Related Party Transaction [Line Items]
Receivables from affiliates, current		117
Accounts Payable, Related Parties, Current		131
Exelon Generation Co L L C [Member] \| Commonwealth Edison Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current		41
Exelon Generation Co L L C [Member] \| PECO Energy Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current		30
Exelon Generation Co L L C [Member] \| Baltimore Gas And Electric Company Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current		4
Exelon Generation Co L L C [Member] \| Pepco Holdings LLC Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current		0
Exelon Generation Co L L C [Member] \| Potomac Electric Power Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current		20
Exelon Generation Co L L C [Member] \| Delmarva Power and Light Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current		4
Exelon Generation Co L L C [Member] \| Atlantic City Electric Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current		7
Exelon Generation Co L L C [Member] \| Other Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current		11
Commonwealth Edison Co [Member]
Related Party Transaction [Line Items]
Receivables from affiliates, current	3	16
Accounts Payable, Related Parties, Current	74	121
Commonwealth Edison Co [Member] \| Exelon Generation Co LLC Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current		13
Commonwealth Edison Co [Member] \| PECO Energy Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	0	0
Commonwealth Edison Co [Member] \| Baltimore Gas And Electric Company Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	0	0
Commonwealth Edison Co [Member] \| Pepco Holdings LLC Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	0	0
Commonwealth Edison Co [Member] \| Potomac Electric Power Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	0	0
Commonwealth Edison Co [Member] \| Delmarva Power and Light Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	0	0
Commonwealth Edison Co [Member] \| Atlantic City Electric Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	0	0
Commonwealth Edison Co [Member] \| Other Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	3	3
Commonwealth Edison Co [Member] \| Affiliated Entities [Member]
Related Party Transaction [Line Items]
Accounts Payable, Related Parties, Current	74	121
PECO Energy Co [Member]
Related Party Transaction [Line Items]
Receivables from affiliates, current	4	1
Accounts Payable, Related Parties, Current	42	70
PECO Energy Co [Member] \| Exelon Generation Co LLC Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current		0
PECO Energy Co [Member] \| Commonwealth Edison Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	0	0
PECO Energy Co [Member] \| Baltimore Gas And Electric Company Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	0	0
PECO Energy Co [Member] \| Pepco Holdings LLC Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	0	1
PECO Energy Co [Member] \| Potomac Electric Power Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	0	0
PECO Energy Co [Member] \| Delmarva Power and Light Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	2	0
PECO Energy Co [Member] \| Atlantic City Electric Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	2	0
PECO Energy Co [Member] \| Other Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	0	0
Baltimore Gas and Electric Company [Member]
Related Party Transaction [Line Items]
Receivables from affiliates, current	0	1
Accounts Payable, Related Parties, Current	39	48
Baltimore Gas and Electric Company [Member] \| Exelon Generation Co LLC Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current		0
Baltimore Gas and Electric Company [Member] \| Commonwealth Edison Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	0	0
Baltimore Gas and Electric Company [Member] \| PECO Energy Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	0	0
Baltimore Gas and Electric Company [Member] \| Pepco Holdings LLC Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	0	0
Baltimore Gas and Electric Company [Member] \| Potomac Electric Power Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	0	1
Baltimore Gas and Electric Company [Member] \| Delmarva Power and Light Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	0	0
Baltimore Gas and Electric Company [Member] \| Atlantic City Electric Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	0	0
Baltimore Gas and Electric Company [Member] \| Other Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	0	0
Pepco Holdings LLC [Member]
Related Party Transaction [Line Items]
Receivables from affiliates, current	2	2
Accounts Payable, Related Parties, Current	66	104
Pepco Holdings LLC [Member] \| Affiliated Entities [Member]
Related Party Transaction [Line Items]
Accounts Payable, Related Parties, Current	14	16
Potomac Electric Power Company [Member]
Related Party Transaction [Line Items]
Receivables from affiliates, current	0	0
Accounts Payable, Related Parties, Current	34	59
Potomac Electric Power Company [Member] \| Exelon Generation Co LLC Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current		0
Potomac Electric Power Company [Member] \| Commonwealth Edison Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	0	0
Potomac Electric Power Company [Member] \| PECO Energy Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	0	0
Potomac Electric Power Company [Member] \| Baltimore Gas And Electric Company Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	0	0
Potomac Electric Power Company [Member] \| Pepco Holdings LLC Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	0	0
Potomac Electric Power Company [Member] \| Delmarva Power and Light Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	0	0
Potomac Electric Power Company [Member] \| Atlantic City Electric Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	0	0
Potomac Electric Power Company [Member] \| Other Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	0	0
Delmarva Power & Light Company [Member]
Related Party Transaction [Line Items]
Receivables from affiliates, current	0	1
Accounts Payable, Related Parties, Current	22	33
Atlantic City Electric Company [Member]
Related Party Transaction [Line Items]
Receivables from affiliates, current	1	2
Accounts Payable, Related Parties, Current	26	31
Atlantic City Electric Company [Member] \| Exelon Generation Co LLC Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current		0
Atlantic City Electric Company [Member] \| Commonwealth Edison Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	0	0
Atlantic City Electric Company [Member] \| PECO Energy Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	0	0
Atlantic City Electric Company [Member] \| Baltimore Gas And Electric Company Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	0	0
Atlantic City Electric Company [Member] \| Pepco Holdings LLC Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	0	1
Atlantic City Electric Company [Member] \| Potomac Electric Power Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	0	1
Atlantic City Electric Company [Member] \| Delmarva Power and Light Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	0	0
Atlantic City Electric Company [Member] \| Other Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	1	0
Business Services Company [Member]
Related Party Transaction [Line Items]
Receivables from affiliates, current	193	306
Business Services Company [Member] \| Exelon Generation Co LLC Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current		102
Business Services Company [Member] \| Commonwealth Edison Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	66	71
Business Services Company [Member] \| PECO Energy Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	39	36
Business Services Company [Member] \| Baltimore Gas And Electric Company Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	38	41
Business Services Company [Member] \| Pepco Holdings LLC Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	4	5
Business Services Company [Member] \| Potomac Electric Power Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	20	21
Business Services Company [Member] \| Delmarva Power and Light Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	12	17
Business Services Company [Member] \| Atlantic City Electric Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	14	13
Business Services Company [Member] \| Other Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	0	0
PHI Service Company [Member]
Related Party Transaction [Line Items]
Receivables from affiliates, current	30	32
PHI Service Company [Member] \| Exelon Generation Co LLC Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current		0
PHI Service Company [Member] \| Commonwealth Edison Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	0	0
PHI Service Company [Member] \| PECO Energy Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	0	0
PHI Service Company [Member] \| Baltimore Gas And Electric Company Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	0	0
PHI Service Company [Member] \| Pepco Holdings LLC Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	0	0
PHI Service Company [Member] \| Potomac Electric Power Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	13	12
PHI Service Company [Member] \| Delmarva Power and Light Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	8	11
PHI Service Company [Member] \| Atlantic City Electric Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	9	9
PHI Service Company [Member] \| Other Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	0	0
Other Legal Entities [Member]
Related Party Transaction [Line Items]
Receivables from affiliates, current	24	47
Accounts Payable, Related Parties, Current	4	14
Other Legal Entities [Member] \| Exelon Generation Co LLC Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current		16
Other Legal Entities [Member] \| Commonwealth Edison Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	8	9
Other Legal Entities [Member] \| PECO Energy Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	3	4
Other Legal Entities [Member] \| Baltimore Gas And Electric Company Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	1	3
Other Legal Entities [Member] \| Pepco Holdings LLC Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	10	9
Other Legal Entities [Member] \| Potomac Electric Power Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	1	3
Other Legal Entities [Member] \| Delmarva Power and Light Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	0	1
Other Legal Entities [Member] \| Atlantic City Electric Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	1	2
Delmarva Power & Light Co
Related Party Transaction [Line Items]
Receivables from affiliates, current	0	1
Accounts Payable, Related Parties, Current	22
Delmarva Power & Light Co \| Exelon Generation Co LLC Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current		0
Delmarva Power & Light Co \| Commonwealth Edison Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	0	0
Delmarva Power & Light Co \| PECO Energy Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	0	0
Delmarva Power & Light Co \| Baltimore Gas And Electric Company Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	0	0
Delmarva Power & Light Co \| Pepco Holdings LLC Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	0	0
Delmarva Power & Light Co \| Potomac Electric Power Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	0	1
Delmarva Power & Light Co \| Atlantic City Electric Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	0	0
Delmarva Power & Light Co \| Other Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	$ 0	$ 0

Related Party Transactions - Lo

Related Party Transactions - Long Term Debt to Financing Trusts (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Related Party Transaction [Line Items]
Long-term debt to financing trusts	$ 390	$ 390
ComEd Financing III Affiliate [Member]
Related Party Transaction [Line Items]
Long-term debt to financing trusts	206	206
PECO Trust III Affiliate [Member]
Related Party Transaction [Line Items]
Long-term debt to financing trusts	81	81
PECO Trust IV Affiliate [Member]
Related Party Transaction [Line Items]
Long-term debt to financing trusts	103	103
Commonwealth Edison Co [Member]
Related Party Transaction [Line Items]
Long-term debt to financing trusts	205	205
Commonwealth Edison Co [Member] \| ComEd Financing III Affiliate [Member]
Related Party Transaction [Line Items]
Long-term debt to financing trusts	205	205
Commonwealth Edison Co [Member] \| PECO Trust III Affiliate [Member]
Related Party Transaction [Line Items]
Long-term debt to financing trusts	0	0
Commonwealth Edison Co [Member] \| PECO Trust IV Affiliate [Member]
Related Party Transaction [Line Items]
Long-term debt to financing trusts	0	0
PECO Energy Co [Member]
Related Party Transaction [Line Items]
Long-term debt to financing trusts	184	184
PECO Energy Co [Member] \| ComEd Financing III Affiliate [Member]
Related Party Transaction [Line Items]
Long-term debt to financing trusts	0	0
PECO Energy Co [Member] \| PECO Trust III Affiliate [Member]
Related Party Transaction [Line Items]
Long-term debt to financing trusts	81	81
PECO Energy Co [Member] \| PECO Trust IV Affiliate [Member]
Related Party Transaction [Line Items]
Long-term debt to financing trusts	$ 103	$ 103

Schedule I - Condensed Financ_2

Schedule I - Condensed Financial Information of Parent (Exelon Corporate) - Condensed Statements of Operations and Other Comprehensive Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Operating Expenses [Abstract]
Total operating expenses	$ 15,761	$ 15,256	$ 14,485
Operating Loss	3,315	2,682	2,191
Other income and (deductions)
Interest Expense, net	(1,422)	(1,264)	(1,282)
Other, net	535	261	208
Total other income	(912)	(1,028)	(1,099)
Income taxes	349	38	(7)
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	2,054	1,616	1,099
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	117	213	855
Net income (loss)	2,171	1,829	1,954
Other comprehensive income (loss), net of income taxes
Prior service benefit reclassified to periodic cost	(1)	(4)	(40)
Actuarial loss reclassified to periodic cost	42	223	190
Pension and non-pension postretirement benefit plan valuation adjustment	46	432	(357)
Unrealized (loss) gain on cash flow hedges	2	(1)	(3)
Other comprehensive income (loss)	89	650	(206)
Comprehensive Income	2,259	2,356	1,757
Corporate, Non-Segment [Member]
Operating Expenses [Abstract]
Operating and maintenance	25	(9)	(2)
Operating and maintenance from affiliates	4	14	10
Other	2	2	2
Total operating expenses	31	7	10
Operating Loss	(31)	(7)	(10)
Other income and (deductions)
Interest Expense, net	(413)	(333)	(378)
Equity in earnings of unconsolidated affiliates	2,450	1,908	1,482
Interest income from affiliates, net	5	0	1
Other, net	22	0	15
Total other income	2,064	1,575	1,120
Income before income taxes	2,033	1,568	1,110
Income taxes	(21)	(48)	11
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	2,054	1,616	1,099
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	116	90	864
Net income (loss)	2,170	1,706	1,963
Other comprehensive income (loss), net of income taxes
Prior service benefit reclassified to periodic cost	(1)	(4)	(40)
Actuarial loss reclassified to periodic cost	42	223	190
Pension and non-pension postretirement benefit plan valuation adjustment	46	431	(357)
Unrealized (loss) gain on cash flow hedges	2	0	(1)
Other comprehensive income (loss)	89	650	(208)
Comprehensive Income	$ 2,259	$ 2,356	$ 1,755

Schedule I - Condensed Financ_3

Schedule I - Condensed Financial Information of Parent (Exelon Corporate) - Condensed Statements of Cash Flows (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Net cash flows provided by operating activities	$ 4,870	$ 3,012	$ 4,235
Cash flows from investing activities
Payments for (Proceeds from) Other Investing Activities	0	26	18
Net cash flows used in investing activities	(6,990)	(3,317)	(4,336)
Cash flows from financing activities
Changes in short-term borrowings	986	269	161
Proceeds from short-term borrowings with maturities greater than 90 days	1,300	1,380	500
Repayments on short-term borrowings with maturities greater than 90 days	(1,500)	(350)	0
Issuance of long-term debt	6,309	3,481	7,507
Retirement of long-term debt	(2,073)	(1,640)	(6,440)
Proceeds from Issuance of Common Stock	563	0	0
Dividends paid on common stock	(1,334)	(1,497)	(1,492)
Proceeds from employee stock plans	36	80	45
Other financing activities	(102)	(80)	(136)
Net cash flows provided by (used in) financing activities	1,591	758	145
Increase (decrease) in cash, restricted cash, and cash equivalents	(529)	453	44
Cash, restricted cash, and cash equivalents at beginning of period	1,619	1,166	1,122
Cash, restricted cash, and cash equivalents at end of period	1,090	1,619	1,166
Corporate, Non-Segment [Member]
Net cash flows provided by operating activities	1,690	3,629	3,018
Cash flows from investing activities
Changes in Exelon/PHI intercompany money pool	35	381	(477)
Notes receivable from affiliates	274	0	550
Investment in affiliates	(4,011)	(2,231)	(1,969)
Payments for (Proceeds from) Other Investing Activities	0	1	0
Net cash flows used in investing activities	(3,702)	(1,849)	(1,896)
Cash flows from financing activities
Changes in short-term borrowings	448	0	(136)
Proceeds from short-term borrowings with maturities greater than 90 days	1,150	500	0
Repayments on short-term borrowings with maturities greater than 90 days	(1,300)	(350)	0
Issuance of long-term debt	3,350	0	2,000
Retirement of long-term debt	(1,150)	(300)	(1,450)
Proceeds from Issuance of Common Stock	563	0	0
Dividends paid on common stock	(1,334)	(1,497)	(1,492)
Proceeds from employee stock plans	36	80	45
Other financing activities	(35)	19	(27)
Net cash flows provided by (used in) financing activities	1,728	(1,548)	(1,060)
Increase (decrease) in cash, restricted cash, and cash equivalents	(284)	232	62
Cash, restricted cash, and cash equivalents at beginning of period	295	63	1
Cash, restricted cash, and cash equivalents at end of period	$ 11	$ 295	$ 63

Schedule I - Condensed Financ_4

Schedule I - Condensed Financial Information of Parent (Exelon Corporate) - Condensed Balance Sheet (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Current assets
Cash and cash equivalents	$ 407	$ 672	$ 432	$ 587
Accounts receivable
Other accounts receivable, net	1,344	996
Regulatory assets, current	1,641	1,296
Other	406	387
Total current assets	7,336	13,957
Property, plant and equipment, net	69,076	64,558
Deferred debits and other assets
Regulatory assets, noncurrent	8,037	8,224
Other	1,141	885
Total deferred debits and other assets	18,937	54,498
Total assets	95,349	133,013
Current liabilities
Short-term borrowings	2,586	1,248
Long-term debt due within one year	1,802	2,153
Accounts payable	3,382	2,379
Accrued expenses	1,226	1,137
Payables to affiliates, current	5	5
Regulatory liabilities, current	437	376
Other	1,155	766
Total current liabilities	10,611	16,111
Long-term debt	35,272	30,749
Deferred credits and other liabilities
Regulatory liabilities, noncurrent	9,112	9,628
Pension obligations	1,109	2,051
Non-pension postretirement benefits obligations	507	811
Other	1,967	1,573
Total deferred credits and other liabilities	24,332	50,968
Total liabilities	70,605	98,218
Commitments and contingencies
Shareholders’ equity
Common Stock, No Par Value	$ 0	$ 0
Common Stock, Shares Authorized	2,000	2,000
Common Stock, Shares, Outstanding	994	979
Common stock	$ 20,908	$ 20,324
Treasury Stock, Shares	2	2
Treasury stock, at cost	$ (123)	$ (123)
Retained earnings	4,597	16,942
Accumulated other comprehensive loss, net	(638)	(2,750)
Total shareholders’ equity	24,744	34,393
Total liabilities and equity	95,349	133,013
Corporate, Non-Segment [Member]
Current assets
Cash and cash equivalents	11	295
Accounts receivable
Other accounts receivable, net	358	318
Accounts receivable from affiliates, current	17	35
Note receivable from affiliates, current	182	217
Regulatory assets, current	154	266
Other	6	41
Total current assets	728	1,172
Property, plant and equipment, net	44	45
Deferred debits and other assets
Regulatory assets, noncurrent	2,650	3,164
Investments in affiliates	35,925	29,563
Amount of investment in equity method investee and investment in and advance to affiliate	0	12,333
Deferred income taxes	929	1,351
Non-pension postretirement benefit asset	187	0
Notes receivable from affiliates, noncurrent	0	319
Other	115	42
Total deferred debits and other assets	39,806	46,772
Total assets	40,578	47,989
Current liabilities
Short-term borrowings	948	650
Long-term debt due within one year	850	1,150
Accounts payable	188	0
Accrued expenses	101	47
Payables to affiliates, current	360	360
Regulatory liabilities, current	12	3
Pension obligations	77	49
Other	7	40
Total current liabilities	2,543	2,299
Long-term debt	8,742	6,265
Deferred credits and other liabilities
Regulatory liabilities, noncurrent	103	63
Pension obligations	3,896	4,416
Non-pension postretirement benefits obligations	0	87
Deferred income taxes	53	362
Other	497	104
Total deferred credits and other liabilities	4,549	5,032
Total liabilities	15,834	13,596
Commitments and contingencies
Shareholders’ equity
Common Stock, No Par Value	$ 0	$ 0
Common Stock, Shares Authorized	2,000	2,000
Common Stock, Shares, Outstanding	994	979
Common stock	$ 20,908	$ 20,324
Treasury Stock, Shares	2	2
Treasury stock, at cost	$ (123)	$ (123)
Retained earnings	4,597	16,942
Accumulated other comprehensive loss, net	(638)	(2,750)
Total shareholders’ equity	24,744	34,393
Total liabilities and equity	$ 40,578	$ 47,989

Schedule I - Condensed Financ_5

Schedule I - Condensed Financial Information of Parent (Exelon Corporate) - Basis of Presentation - Narrative (Details) - Corporate, Non-Segment [Member]	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Exelon significant subsidiaries
Schedule of Equity Method Investments [Line Items]
Percentage ownership of consolidated subsidiaries	100%	100%
Commonwealth Edison Company [Member]
Schedule of Equity Method Investments [Line Items]
Percentage ownership of consolidated subsidiaries	99%	99%

Schedule I - Condensed Financ_6

Schedule I - Condensed Financial Information of Parent (Exelon Corporate) - Debt and Credit Agreements - Narrative (Details) - USD ($) $ in Millions				12 Months Ended
	Oct. 11, 2022	Aug. 11, 2022	Jan. 24, 2022	Dec. 31, 2022	Oct. 07, 2022	Feb. 01, 2022	Jan. 31, 2022	Dec. 31, 2021
Line of Credit Facility [Line Items]
Proceeds from (Repayments of) Debt		$ 575
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity				$ 4,000
Line of credit facility, remaining borrowing capacity				3,992
Commercial Paper
Line of Credit Facility [Line Items]
Commercial Paper				1,938				$ 599
Line of credit facility, maximum borrowing capacity				4,000				3,700
Corporate, Non-Segment [Member]
Line of Credit Facility [Line Items]
Proceeds from (Repayments of) Debt	$ 575	$ 575
Corporate, Non-Segment [Member] \| Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity				900		$ 900	$ 600
Line of credit facility, remaining borrowing capacity				448
Corporate, Non-Segment [Member] \| ShortTermDebt03232017 [Member]
Line of Credit Facility [Line Items]
Short-Term Loans				500
Corporate, Non-Segment [Member] \| ShortTermDebt03312021.2 [Member]
Line of Credit Facility [Line Items]
Short-Term Loans				150
Corporate, Non-Segment [Member] \| ShortTermDebt03312021.1 [Member]
Line of Credit Facility [Line Items]
Short-Term Loans				150
Corporate, Non-Segment [Member] \| ShortTermDebt01242022
Line of Credit Facility [Line Items]
Short-Term Loans			$ 1,150
Corporate, Non-Segment [Member] \| CorpTermLoanApr2024 \| Notes Payable to Banks
Line of Credit Facility [Line Items]
Debt Instrument, Face Amount					$ 500
Corporate, Non-Segment [Member] \| Commercial Paper
Line of Credit Facility [Line Items]
Commercial Paper				449				0
Line of credit facility, maximum borrowing capacity				$ 900				$ 600
Corporate, Non-Segment [Member] \| London Interbank Offered Rate (LIBOR) [Member] \| ShortTermDebt03312021.2 [Member]
Line of Credit Facility [Line Items]
Short-Term Loans, Interest rate terms				0.65
Corporate, Non-Segment [Member] \| London Interbank Offered Rate (LIBOR) [Member] \| ShortTermDebt03312021.1 [Member]
Line of Credit Facility [Line Items]
Short-Term Loans, Interest rate terms				0.65
Corporate, Non-Segment [Member] \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate \| Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of credit facility, interest rate at period end						1.275%
Corporate, Non-Segment [Member] \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate \| ShortTermDebt03232017 [Member]
Line of Credit Facility [Line Items]
Short-Term Loans, Interest rate terms				0.65
Corporate, Non-Segment [Member] \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate \| ShortTermDebt01242022
Line of Credit Facility [Line Items]
Short-Term Loans, Interest rate terms			0.75
Corporate, Non-Segment [Member] \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate \| ShortTermDebtSOFRplus075PLUS22.5BPincreaseJan2023
Line of Credit Facility [Line Items]
Short-Term Loans, Interest rate terms				0.975

Schedule I - Condensed Financ_7

Schedule I - Condensed Financial Information of Parent (Exelon Corporate) - Debt and Credit Agreements - Schedule of Outstanding Long-term Debt (Details) - USD ($) $ in Millions	Jan. 24, 2022	Jan. 21, 2022	Dec. 31, 2022	Jan. 31, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Long-term debt, gross			$ 36,779		$ 32,523
Unamortized debt discount and premium, net			74		70
Unamortized debt issuance costs			(257)		(220)
Long-term debt (including amounts due within one year)			626		669
Long-term Debt, Current Maturities			(1,802)		(2,153)
Long-term debt			35,272		30,749
Exelon Corporate [Member] \| Exelon Generation Co L L C [Member]
Debt Instrument [Line Items]
Due from Affiliate, Noncurrent			0	$ 258	319
Junior subordinated notes [Member]
Debt Instrument [Line Items]
Long-term debt, gross			0		1,150
Senior unsecured notes [Member]
Debt Instrument [Line Items]
Long-term debt, gross			8,324		6,324
Loan agreement [Member]
Debt Instrument [Line Items]
Long-term debt, gross			$ 1,400		50
Minimum [Member] \| Senior unsecured notes [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage			2.75%
Long-term Debt, Maturity Date			Dec. 31, 2025
Minimum [Member] \| Loan agreement [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage			2%
Long-term Debt, Maturity Date			Dec. 31, 2023
Maximum [Member] \| Junior subordinated notes [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage			3.50%
Long-term Debt, Maturity Date			Dec. 31, 2022
Maximum [Member] \| Senior unsecured notes [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage			7.60%
Long-term Debt, Maturity Date			Dec. 31, 2052
Maximum [Member] \| Loan agreement [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage			5.15%
Long-term Debt, Maturity Date			Dec. 31, 2024
Corporate, Non-Segment [Member]
Debt Instrument [Line Items]
Long-term debt, gross			$ 9,489		7,289
Unamortized debt discount and premium, net			(10)		(10)
Unamortized debt issuance costs			(51)		(39)
Long-term debt (including amounts due within one year)			164		175
Long-term Debt, Current Maturities			(850)		(1,150)
Long-term debt			8,742		6,265
Due from Affiliate, Noncurrent			0		319
Corporate, Non-Segment [Member] \| Junior subordinated notes [Member]
Debt Instrument [Line Items]
Long-term debt, gross			0		1,150
Corporate, Non-Segment [Member] \| Senior unsecured notes [Member]
Debt Instrument [Line Items]
Long-term debt, gross			8,139		6,139
Corporate, Non-Segment [Member] \| Loan agreement [Member]
Debt Instrument [Line Items]
Long-term debt, gross		$ 300	$ 1,350		$ 0
Corporate, Non-Segment [Member] \| Loan agreement [Member] \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Debt Instrument [Line Items]
Subordinated Borrowing, Interest Rate		0.65%
Corporate, Non-Segment [Member] \| Loans Payable Two \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Debt Instrument [Line Items]
Subordinated Borrowing, Interest Rate		0.65%
Corporate, Non-Segment [Member] \| Loans Payable Three
Debt Instrument [Line Items]
Long-term debt, gross	$ 250
Corporate, Non-Segment [Member] \| Loans Payable Three \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Debt Instrument [Line Items]
Subordinated Borrowing, Interest Rate	0.65%
Corporate, Non-Segment [Member] \| Minimum [Member] \| Senior unsecured notes [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage			2.75%
Long-term Debt, Maturity Date			Dec. 31, 2025
Corporate, Non-Segment [Member] \| Minimum [Member] \| Loan agreement [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage			4.95%
Long-term Debt, Maturity Date			Dec. 31, 2023
Corporate, Non-Segment [Member] \| Maximum [Member] \| Junior subordinated notes [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage			3.50%
Long-term Debt, Maturity Date			Dec. 31, 2022
Corporate, Non-Segment [Member] \| Maximum [Member] \| Senior unsecured notes [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage			7.60%
Long-term Debt, Maturity Date			Dec. 31, 2052
Corporate, Non-Segment [Member] \| Maximum [Member] \| Loan agreement [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage			5.15%
Long-term Debt, Maturity Date			Dec. 31, 2024

Schedule I - Condensed Financ_8

Schedule I - Condensed Financial Information of Parent (Exelon Corporate) - Debt and Credit Agreements - Schedule of Debt Maturities (Details) $ in Millions	Dec. 31, 2022 USD ($)
Debt Instrument [Line Items]
2023	$ 1,802
2024	1,317
2025	1,414
2026	1,613
2027	1,021
Thereafter	30,002
Total	37,169
Corporate, Non-Segment [Member]
Debt Instrument [Line Items]
2023	850
2024	500
2025	807
2026	750
2027	650
Thereafter	5,932
Total	$ 9,489

Schedule I - Condensed Financ_9

Schedule I - Condensed Financial Information of Parent (Exelon Corporate) - Related Party Transactions - Summary of Related Party Transactions (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Jan. 31, 2022
Related Party Transaction [Line Items]
Payables to affiliates, current	$ 5	$ 5
Exelon Foundation Charitable Contribution	20
Exelon Corporate [Member]
Related Party Transaction [Line Items]
Operating and maintenance from affiliates	4	14	$ 10
Interest income from affiliates, net	5	0	1
Equity in earnings of unconsolidated affiliates	2,450	1,908	1,482
Contributions from member	2,027	1,842	1,638
Accounts receivable from affiliates, current	17	35
Note receivable from affiliates, current	182	217
Investments in affiliates	35,925	29,563
Payables to affiliates, current	360	360
Exelon Corporate [Member] \| Exelon Business Services Co Affiliate [Member]
Related Party Transaction [Line Items]
Operating and maintenance from affiliates	4	14	10
Interest income from affiliates, net	4	0	1
Equity in earnings of unconsolidated affiliates	(18)	(301)	(273)
Accounts receivable from affiliates, current	3	4
Note receivable from affiliates, current	138	210
Investments in affiliates	384	146
Exelon Corporate [Member] \| Other Affiliate [Member]
Related Party Transaction [Line Items]
Equity in earnings of unconsolidated affiliates	(1)	2	27
Investments in affiliates	(2)	(3,663)
Exelon Corporate [Member] \| Exelon Generation Co L L C [Member]
Related Party Transaction [Line Items]
Accounts receivable from affiliates, current	0	13
Notes receivable from affiliates, noncurrent	0	319		$ 258
Exelon Corporate [Member] \| Exelon Energy Delivery Company LLC [Member]
Related Party Transaction [Line Items]
Interest income from affiliates, net	1	0	0
Equity in earnings of unconsolidated affiliates	2,482	2,215	1,729
Investments in affiliates	35,092	32,621
Exelon Corporate [Member] \| UII LLC [Member]
Related Party Transaction [Line Items]
Investments in affiliates	365	365
Payables to affiliates, current	360	360
Exelon Corporate [Member] \| Potomac Capital Investment Affiliate [Member]
Related Party Transaction [Line Items]
Equity in earnings of unconsolidated affiliates	(9)	(1)	0
Investments in affiliates	52	62
Exelon Corporate [Member] \| Exelon Enterprise [Member]
Related Party Transaction [Line Items]
Accounts receivable from affiliates, current	0	1
Investments in affiliates	3	3
Exelon Corporate [Member] \| Exelon INQB8R, LLC [Member] [Member]
Related Party Transaction [Line Items]
Equity in earnings of unconsolidated affiliates	(4)	(7)	$ (1)
Investments in affiliates	15	26
Exelon Corporate [Member] \| Commonwealth Edison Co [Member]
Related Party Transaction [Line Items]
Accounts receivable from affiliates, current	4	5
Exelon Corporate [Member] \| PECO Energy Co [Member]
Related Party Transaction [Line Items]
Accounts receivable from affiliates, current	2	4
Exelon Corporate [Member] \| Baltimore Gas and Electric Company [Member]
Related Party Transaction [Line Items]
Accounts receivable from affiliates, current	1	2
Exelon Corporate [Member] \| PHI Service Co Affiliate [Member]
Related Party Transaction [Line Items]
Accounts receivable from affiliates, current	7	6
Exelon Corporate [Member] \| Pepco Holdings LLC Affiliate [Member]
Related Party Transaction [Line Items]
Note receivable from affiliates, current	44	7
Exelon Corporate [Member] \| VEBA [Member]
Related Party Transaction [Line Items]
Investments in affiliates	4	3
Exelon Corporate [Member] \| Connectiv, LLC
Related Party Transaction [Line Items]
Investments in affiliates	$ 12	$ 0

Schedule II - Valuation and Q_2

Schedule II - Valuation and Qualifying Accounts Schedule (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
SEC Schedule, 12-09, Allowance, Credit Loss [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	$ 392	$ 405	$ 213
Charged to Costs and Expenses	174	107	228
Charged to Other Accounts	28	0	38
Deductions	185	120	74
Balance at End of Period	409	392	405
Deferred Tax Valuation Allowance [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	37	4	2
Charged to Costs and Expenses	0	0	0
Charged to Other Accounts	57	33	2
Deductions	0	0	0
Balance at End of Period	94	37	4
Reserve for Obsolete Materials [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	13	11	12
Charged to Costs and Expenses	8	5	5
Charged to Other Accounts	0	0	0
Deductions	6	3	6
Balance at End of Period	15	13	11
SEC Schedule, 12-09, Allowance, Notes Receivable [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	14	5
Balance at End of Period	7	14	5
Commonwealth Edison Co [Member] \| SEC Schedule, 12-09, Allowance, Credit Loss [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	90	118	79
Charged to Costs and Expenses	24	18	54
Charged to Other Accounts	8	1	13
Deductions	46	47	28
Balance at End of Period	76	90	118
Commonwealth Edison Co [Member] \| Reserve for Obsolete Materials [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	7	6	7
Charged to Costs and Expenses	5	3	3
Charged to Other Accounts	0	0	0
Deductions	4	2	4
Balance at End of Period	8	7	6
PECO Energy Co [Member] \| SEC Schedule, 12-09, Allowance, Credit Loss [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	112	124	62
Charged to Costs and Expenses	44	32	76
Charged to Other Accounts	14	(6)	6
Deductions	56	38	20
Balance at End of Period	114	112	124
PECO Energy Co [Member] \| Deferred Tax Valuation Allowance [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	3	1	0
Charged to Costs and Expenses	0	0	0
Charged to Other Accounts	4	2	1
Deductions	0	0	0
Balance at End of Period	7	3	1
PECO Energy Co [Member] \| Reserve for Obsolete Materials [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	2	2	2
Charged to Costs and Expenses	2	1	1
Charged to Other Accounts	0	0	0
Deductions	1	1	1
Balance at End of Period	3	2	2
PECO Energy Co [Member] \| SEC Schedule, 12-09, Allowance, Notes Receivable [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	14	5
Balance at End of Period	7	14	5
Baltimore Gas and Electric Company [Member] \| SEC Schedule, 12-09, Allowance, Credit Loss [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	47	44	17
Charged to Costs and Expenses	37	16	31
Charged to Other Accounts	6	3	6
Deductions	26	16	10
Balance at End of Period	64	47	44
Baltimore Gas and Electric Company [Member] \| Deferred Tax Valuation Allowance [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	0	0	1
Charged to Costs and Expenses	0		0
Charged to Other Accounts	3		(1)
Deductions	0		0
Balance at End of Period	3	0	0
Baltimore Gas and Electric Company [Member] \| Reserve for Obsolete Materials [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	1	1	1
Charged to Costs and Expenses	1	0	0
Charged to Other Accounts	0	0	0
Deductions	0	0	0
Balance at End of Period	2	1	1
Pepco Holdings LLC [Member] \| SEC Schedule, 12-09, Allowance, Credit Loss [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	143	119	53
Charged to Costs and Expenses	69	41	69
Charged to Other Accounts	0	2	13
Deductions	57	19	16
Balance at End of Period	155	143	119
Pepco Holdings LLC [Member] \| Deferred Tax Valuation Allowance [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	31	0
Charged to Costs and Expenses	0	0
Charged to Other Accounts	4	31
Deductions	0	0
Balance at End of Period	35	31	0
Pepco Holdings LLC [Member] \| Reserve for Obsolete Materials [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	3	2	3
Charged to Costs and Expenses	0	1	0
Charged to Other Accounts	0	0	0
Deductions	1	0	1
Balance at End of Period	2	3	2
Potomac Electric Power Company [Member] \| SEC Schedule, 12-09, Allowance, Credit Loss [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	53	45	20
Charged to Costs and Expenses	36	14	25
Charged to Other Accounts	4	2	5
Deductions	21	8	5
Balance at End of Period	72	53	45
Potomac Electric Power Company [Member] \| Reserve for Obsolete Materials [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	1	1	1
Charged to Costs and Expenses	0	0	0
Charged to Other Accounts	0	0	0
Deductions	0	0	0
Balance at End of Period	1	1	1
Delmarva Power & Light Company [Member] \| SEC Schedule, 12-09, Allowance, Credit Loss [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	26	31	15
Charged to Costs and Expenses	13	6	16
Charged to Other Accounts	(2)	(1)	4
Deductions	9	10	4
Balance at End of Period	28	26	31
Delmarva Power & Light Company [Member] \| Deferred Tax Valuation Allowance [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	31	0
Charged to Costs and Expenses	0	0
Charged to Other Accounts	1	31
Deductions	0	0
Balance at End of Period	32	31	0
Atlantic City Electric Company [Member] \| SEC Schedule, 12-09, Allowance, Credit Loss [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	64	43	18
Charged to Costs and Expenses	20	21	28
Charged to Other Accounts	(2)	1	4
Deductions	27	1	7
Balance at End of Period	55	64	43
Atlantic City Electric Company [Member] \| Reserve for Obsolete Materials [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	1	0	1
Charged to Costs and Expenses	0	1	0
Charged to Other Accounts	0	0	0
Deductions	0	0	1
Balance at End of Period	$ 1	$ 1	$ 0