Commonwealth Edison 10-Q3 Aug 222022 Q2 Quarterly reportFinancial data

Company Profile

Cover Page

Cover Page	6 Months Ended
Cover Page	Jun. 30, 2022 shares
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 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 Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock Shares Outstanding	980,472,436
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	Q2
Current Fiscal Year End Date	--12-31
Entity Central Index Key	0001109357
Amendment Flag	false
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
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Common Stock Shares Outstanding	127,021,391
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 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 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 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	20068-001
City Area Code	(202)
Local Phone Number	872-2000
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 and 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 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 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
DISTRICT OF COLUMBIA \| Potomac Electric Power Company [Member]
Entity Incorporation, State or Country Code	DC
VIRGINIA \| Potomac Electric Power Company [Member]
Entity Incorporation, State or Country Code	VA
VIRGINIA \| Delmarva Power and Light Company [Member]
Entity Incorporation, State or Country Code	VA
DELAWARE \| Delmarva Power and Light Company [Member]
Entity Incorporation, State or Country Code	DE

Consolidated Statements of Oper

Consolidated Statements of Operations and Comprehensive Income (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022		Jun. 30, 2021
Operating revenues
Revenues from alternative revenue programs	$ (2)	$ 47	$ 27		$ 176
Total operating revenues	4,239	4,020	9,566		8,652
Operating expenses
Purchased power and/or fuel from affiliates	0	257	159		550
Operating and maintenance	1,109	1,073	2,288		2,155
Depreciation and amortization	830	736	1,647		1,494
Taxes other than income taxes	330	314	684		631
Total operating expenses	3,543	3,444	7,971		7,252
Gain on sales of assets and businesses	(2)	4	(2)		4
Operating income (loss)	694	580	1,593		1,404
Other income and (deductions)
Interest expense, net	(352)	(318)	(684)		(630)
Interest expense to affiliates	(6)	(6)	(13)		(13)
Other, net	175	73	313		131
Total other income and (deductions)	(183)	(251)	(384)		(512)
Income (Loss) before income taxes	511	329	1,209		892
Income taxes	46	3	263		42
Equity in losses of unconsolidated affiliates	0	0	0		1
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	465	326	946		851
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	0	150	117		(640)
Net income (loss)	465	476	1,063		211
Net income (loss) attributable to noncontrolling interests	0	75	1		99
Net Income (Loss) Available to Common Stockholders, Basic	465	401	1,062		112
Net Income (Loss) from Continuing Operations Available to Common Shareholders, Basic	465	326	946		851
Net Income (Loss) from Discontinued Operations Available to Common Shareholders, Basic	0	75	116		(739)
Other comprehensive income (loss), net of income taxes
Prior service benefit reclassified to periodic benefit cost	2	(1)	2		(2)
Actuarial loss reclassified to periodic benefit cost	10	56	24		112
Pension and non-pension postretirement benefit plan valuation adjustment	0	0	0		(2)
Unrealized gain (loss) on foreign currency translation	0	2	0		3
Other comprehensive income	12	57	26		111
Comprehensive income	477	533	1,089		322
Comprehensive income attributable to noncontrolling interests	0	75	1		99
Comprehensive income attributable to common shareholders/membership interest	$ 477	$ 458	$ 1,088		$ 223
Average shares of common stock outstanding:
Basic average shares of common stock outstanding	981	978	981		978
Assumed exercise and/or distributions of stock-based awards	1	1	1		1
Diluted average shares of common stock outstanding	982	979	982	[1]	979	[1]
Earnings Per Share [Abstract]
Income (Loss) from Continuing Operations, Per Basic Share	$ 0.47	$ 0.33	$ 0.96		$ 0.87
Income (Loss) from Continuing Operations, Per Diluted Share	0.47	0.33	0.96		0.87
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Basic Share	0	0.08	0.12		(0.76)
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Diluted Share	$ 0	$ 0.08	$ 0.12		$ (0.76)
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	0	0	0		0
Commonwealth Edison Co [Member]
Operating revenues
Revenues from alternative revenue programs	$ 35	$ 9	$ 75		$ 64
Operating revenues from affiliates	3	5	8		11
Total operating revenues	1,425	1,517	3,158		3,052
Operating expenses
Purchased power and/or fuel from affiliates	0	79	59		163
Operating and maintenance	258	250	523		495
Related Party Transaction, Expenses from Transactions with Related Party	80	73	166		144
Depreciation and amortization	328	296	649		589
Taxes other than income taxes	90	77	185		153
Total operating expenses	1,039	1,196	2,444		2,406
Gain on sales of assets and businesses	(2)	0	(2)		0
Operating income (loss)	384	321	712		646
Other income and (deductions)
Interest expense, net	(101)	(95)	(197)		(187)
Interest expense to affiliates	(3)	(3)	(7)		(6)
Other, net	13	15	26		22
Total other income and (deductions)	(91)	(83)	(178)		(171)
Income (Loss) before income taxes	293	238	534		475
Income taxes	66	46	119		85
Net income (loss)	227	192	415		390
Other comprehensive income (loss), net of income taxes
Comprehensive income	227	192	415		390
PECO Energy Co [Member]
Operating revenues
Revenues from alternative revenue programs	0	7	6		17
Operating revenues from affiliates	1	2	2		4
Total operating revenues	816	693	1,863		1,582
Operating expenses
Purchased power and/or fuel from affiliates	0	40	33		81
Operating and maintenance	168	166	364		360
Related Party Transaction, Expenses from Transactions with Related Party	47	43	99		83
Depreciation and amortization	93	87	185		173
Taxes other than income taxes	48	49	95		92
Total operating expenses	639	552	1,432		1,231
Operating income (loss)	177	141	431		351
Other income and (deductions)
Interest expense, net	(40)	(39)	(78)		(74)
Interest expense to affiliates	(3)	(3)	(6)		(6)
Other, net	8	7	16		12
Total other income and (deductions)	(35)	(35)	(68)		(68)
Income (Loss) before income taxes	142	106	363		283
Income taxes	9	2	24		12
Net income (loss)	133	104	339		271
Other comprehensive income (loss), net of income taxes
Comprehensive income	133	104	339		271
Baltimore Gas and Electric Company [Member]
Operating revenues
Revenues from alternative revenue programs	(20)	(10)	(32)		8
Operating revenues from affiliates	3	7	10		13
Total operating revenues	786	682	1,940		1,656
Operating expenses
Purchased power and/or fuel from affiliates	0	59	18		129
Operating and maintenance	154	147	321		299
Related Party Transaction, Expenses from Transactions with Related Party	51	46	102		91
Depreciation and amortization	152	141	322		293
Taxes other than income taxes	71	67	148		139
Total operating expenses	717	620	1,636		1,372
Operating income (loss)	69	62	304		284
Other income and (deductions)
Interest expense, net	(36)	(34)	(71)		(67)
Other, net	5	9	11		16
Total other income and (deductions)	(31)	(25)	(60)		(51)
Income (Loss) before income taxes	38	37	244		233
Income taxes	1	(8)	10		(21)
Net income (loss)	37	45	234		254
Other comprehensive income (loss), net of income taxes
Comprehensive income	37	45	234		254
Pepco Holdings LLC [Member]
Operating revenues
Revenues from alternative revenue programs	(17)	41	(22)		88
Operating revenues from affiliates	2	4	6		7
Total operating revenues	1,221	1,140	2,626		2,384
Operating expenses
Purchased power and/or fuel from affiliates	0	79	50		177
Operating and maintenance	245	217	493		434
Related Party Transaction, Expenses from Transactions with Related Party	47	39	98		79
Depreciation and amortization	240	194	459		404
Taxes other than income taxes	114	109	233		222
Total operating expenses	1,066	955	2,282		2,013
Operating income (loss)	155	185	344		371
Other income and (deductions)
Interest expense, net	(73)	(67)	(143)		(134)
Other, net	19	20	37		36
Total other income and (deductions)	(54)	(47)	(106)		(98)
Income (Loss) before income taxes	101	138	238		273
Income taxes	1	(3)	8		5
Equity in losses of unconsolidated affiliates	0	0	0		1
Net income (loss)	100	141	230		269
Other comprehensive income (loss), net of income taxes
Comprehensive income attributable to common shareholders/membership interest	100	141	230		269
Potomac Electric Power Company [Member]
Operating revenues
Revenues from alternative revenue programs	(1)	19	(7)		46
Operating revenues from affiliates	2	1	2		3
Total operating revenues	581	523	1,195		1,076
Operating expenses
Purchased power and/or fuel from affiliates	0	57	39		130
Operating and maintenance	72	62	145		118
Related Party Transaction, Expenses from Transactions with Related Party	56	51	115		103
Depreciation and amortization	105	96	213		199
Taxes other than income taxes	92	87	186		177
Total operating expenses	487	429	1,034		895
Operating income (loss)	94	94	161		181
Other income and (deductions)
Interest expense, net	(38)	(35)	(74)		(69)
Other, net	13	13	26		25
Total other income and (deductions)	(25)	(22)	(48)		(44)
Income (Loss) before income taxes	69	72	113		137
Income taxes	(1)	(3)	(3)		3
Net income (loss)	70	75	116		134
Other comprehensive income (loss), net of income taxes
Comprehensive income	70	75	116		134
Delmarva Power and Light Company [Member]
Operating revenues
Revenues from alternative revenue programs	(2)	10	(3)		19
Operating revenues from affiliates	2	2	3		4
Total operating revenues	332	298	763		680
Operating expenses
Purchased power and/or fuel from affiliates	0	17	10		37
Operating and maintenance	45	41	97		85
Related Party Transaction, Expenses from Transactions with Related Party	43	39	84		79
Depreciation and amortization	56	51	113		104
Taxes other than income taxes	17	16	35		33
Total operating expenses	296	255	653		564
Operating income (loss)	36	43	110		116
Other income and (deductions)
Interest expense, net	(17)	(16)	(33)		(30)
Other, net	4	4	6		6
Total other income and (deductions)	(13)	(12)	(27)		(24)
Income (Loss) before income taxes	23	31	83		92
Income taxes	2	1	6		6
Net income (loss)	21	30	77		86
Other comprehensive income (loss), net of income taxes
Comprehensive income	21	30	77		86
Atlantic City Electric Company [Member]
Operating revenues
Revenues from alternative revenue programs	(15)	12	(12)		23
Operating revenues from affiliates	1	1	2		1
Total operating revenues	309	319	658		629
Operating expenses
Purchased power and/or fuel from affiliates	0	5	2		9
Operating and maintenance	50	39	97		82
Related Party Transaction, Expenses from Transactions with Related Party	36	34	73		68
Depreciation and amortization	72	40	118		87
Taxes other than income taxes	2	2	4		4
Total operating expenses	283	269	593		552
Operating income (loss)	26	50	65		77
Other income and (deductions)
Interest expense, net	(17)	(14)	(32)		(29)
Other, net	2	0	5		2
Total other income and (deductions)	(15)	(14)	(27)		(27)
Income (Loss) before income taxes	11	36	38		50
Income taxes	0	(1)	1		(1)
Net income (loss)	11	37	37		51
Other comprehensive income (loss), net of income taxes
Comprehensive income	11	37	37		51
Electricity, US Regulated
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax	3,934	3,739	8,415		7,609
Operating expenses
Purchased power and/or fuel	1,167	1,006	2,748		2,146
Electricity, US Regulated \| Commonwealth Edison Co [Member]
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax	1,387	1,503	3,075		2,977
Operating expenses
Purchased power and/or fuel	283	421	862		862
Electricity, US Regulated \| PECO Energy Co [Member]
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax	707	602	1,441		1,251
Operating expenses
Purchased power and/or fuel	244	145	472		334
Electricity, US Regulated \| Baltimore Gas and Electric Company [Member]
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax	642	560	1,377		1,180
Operating expenses
Purchased power and/or fuel	241	133	526		295
Electricity, US Regulated \| Pepco Holdings LLC [Member]
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax	1,199	1,071	2,522		2,195
Operating expenses
Purchased power and/or fuel	401	308	888		656
Electricity, US Regulated \| Potomac Electric Power Company [Member]
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax	580	503	1,200		1,027
Operating expenses
Purchased power and/or fuel	162	76	336		168
Electricity, US Regulated \| Delmarva Power and Light Company [Member]
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax	295	262	643		562
Operating expenses
Purchased power and/or fuel	116	82	253		185
Electricity, US Regulated \| Atlantic City Electric Company [Member]
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax	323	306	668		605
Operating expenses
Purchased power and/or fuel	123	149	299		302
Natural Gas, US Regulated
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax	307	234	1,124		867
Operating expenses
Purchased power and/or fuel	107	58	445		276
Natural Gas, US Regulated \| PECO Energy Co [Member]
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax	108	82	414		310
Operating expenses
Purchased power and/or fuel	39	22	184		108
Natural Gas, US Regulated \| Baltimore Gas and Electric Company [Member]
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax	161	125	585		455
Operating expenses
Purchased power and/or fuel	48	27	199		126
Natural Gas, US Regulated \| Pepco Holdings LLC [Member]
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax	37	24	120		94
Operating expenses
Purchased power and/or fuel	19	9	61		41
Natural Gas, US Regulated \| Delmarva Power and Light Company [Member]
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax	37	24	120		95
Operating expenses
Purchased power and/or fuel	$ 19	$ 9	$ 61		$ 41

[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 three and six months ended June 30, 2022 and 2021, respectively

Consolidated Statements of Cash

Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Cash flows from operating activities
Net income (loss)	$ 1,063	$ 211
Adjustments to reconcile net income to net cash flows provided by operating activities:
Depreciation, amortization, and accretion, including nuclear fuel and energy contract amortization	1,854	4,180
Asset impairments	0	500
Gain on sales of assets and businesses	(8)	(83)
Deferred income taxes and amortization of investment tax credits	143	(163)
Net fair value changes related to derivatives	(59)	(490)
Net realized and unrealized (gains) losses on NDT funds	205	(376)
Net unrealized (gains) losses on equity investments	16	(96)
Other non-cash operating activities	276	(331)
Changes in assets and liabilities:
Accounts receivable	(795)	(16)
Inventories	12	1
Accounts payable and accrued expenses	544	(87)
Option premiums (paid) received, net	(39)	2
Collateral received (posted), net	1,689	957
Income taxes	23	190
Regulatory assets and liabilities, net	(376)	(276)
Pension and non-pension postretirement benefit contributions	(585)	(559)
Other assets and liabilities	(723)	(2,426)
Net Cash Provided by (Used in) Operating Activities, Total	3,240	1,138
Cash flows from investing activities
Capital expenditures	(3,507)	(4,040)
Proceeds from NDT fund sales	488	4,438
Investment in NDT funds	(516)	(4,538)
Collection of deferred purchase price	169	2,209
Proceeds from Sale of Property Held-for-sale	16	724
Other investing activities	4	17
Net Cash Provided by (Used in) Investing Activities, Total	(3,346)	(1,190)
Cash flows from financing activities
Changes in short-term borrowings	(597)	(666)
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	(350)	0
Issuance of long-term debt	5,151	2,455
Retirement of long-term debt	(1,707)	(630)
Dividends paid on common stock	(663)	(747)
Proceeds from employee stock plans	17	47
Transfer of cash, restricted cash, and cash equivalents to Constellation	(2,594)	0
Other financing activities	(84)	(64)
Net cash flows provided by financing activities	323	895
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect, Total	217	843
Cash, restricted cash, and cash equivalents at beginning of period	1,619	1,166
Cash, restricted cash, and cash equivalents at end of period	1,836	2,009
Supplemental Cash Flow Information
Decrease in capital expenditures not paid	(276)	(313)
Increase in deferred purchase price	348	1,958
Increase in PPE related to ARO update	(335)	2
Exelon Generation Co L L C [Member]
Adjustments to reconcile net income to net cash flows provided by operating activities:
Depreciation, amortization, and accretion, including nuclear fuel and energy contract amortization	207	2,686
Gain on sales of assets and businesses	9	(79)
Deferred income taxes and amortization of investment tax credits	(143)	(268)
Net fair value changes related to derivatives	(59)	(490)
Net realized and unrealized (gains) losses on NDT funds	205	(376)
Net unrealized (gains) losses on equity investments	16	(96)
Other non-cash operating activities	(36)	636
Cash flows from investing activities
Capital expenditures	(227)	(731)
Collection of deferred purchase price	169	2,209
Supplemental Cash Flow Information
Decrease in capital expenditures not paid	(128)	(66)
Increase in deferred purchase price	348	1,958
Increase in PPE related to ARO update	335	0
Commonwealth Edison Co [Member]
Cash flows from operating activities
Net income (loss)	415	390
Adjustments to reconcile net income to net cash flows provided by operating activities:
Depreciation, amortization, and accretion, including nuclear fuel and energy contract amortization	649	589
Deferred income taxes and amortization of investment tax credits	122	143
Other non-cash operating activities	(18)	23
Changes in assets and liabilities:
Accounts receivable	(163)	(48)
Receivables from payables to affiliates, net	(43)	5
Inventories	(2)	(2)
Accounts payable and accrued expenses	123	(45)
Collateral received (posted), net	60	2
Income taxes	(19)	(34)
Regulatory assets and liabilities, net	(267)	(181)
Pension and non-pension postretirement benefit contributions	(178)	(173)
Other assets and liabilities	(91)	(111)
Net Cash Provided by (Used in) Operating Activities, Total	588	558
Cash flows from investing activities
Capital expenditures	(1,208)	(1,162)
Other investing activities	15	12
Net Cash Provided by (Used in) Investing Activities, Total	(1,193)	(1,150)
Cash flows from financing activities
Changes in short-term borrowings	0	(290)
Issuance of long-term debt	750	700
Dividends paid on common stock	(289)	(253)
Contributions from parent	335	395
Other financing activities	(12)	(11)
Net cash flows provided by financing activities	784	541
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect, Total	179	(51)
Cash, restricted cash, and cash equivalents at beginning of period	384	405
Cash, restricted cash, and cash equivalents at end of period	563	354
Supplemental Cash Flow Information
Decrease in capital expenditures not paid	(44)	(93)
PECO Energy Co [Member]
Cash flows from operating activities
Net income (loss)	339	271
Adjustments to reconcile net income to net cash flows provided by operating activities:
Depreciation, amortization, and accretion, including nuclear fuel and energy contract amortization	185	173
Deferred income taxes and amortization of investment tax credits	14	21
Other non-cash operating activities	4	(5)
Changes in assets and liabilities:
Accounts receivable	(29)	86
Receivables from payables to affiliates, net	(40)	2
Inventories	(8)	3
Accounts payable and accrued expenses	5	(46)
Income taxes	49	24
Regulatory assets and liabilities, net	(24)	(14)
Pension and non-pension postretirement benefit contributions	(13)	(15)
Other assets and liabilities	(70)	(126)
Net Cash Provided by (Used in) Operating Activities, Total	412	374
Cash flows from investing activities
Capital expenditures	(658)	(577)
Other investing activities	5	4
Net Cash Provided by (Used in) Investing Activities, Total	(653)	(573)
Cash flows from financing activities
Changes in short-term borrowings	210	0
Issuance of long-term debt	350	375
Retirement of long-term debt	(350)	0
Increase (Decrease) in Due to Affiliates, Current	0	(40)
Dividends paid on common stock	(200)	(169)
Contributions from parent	227	395
Other financing activities	(8)	(4)
Net cash flows provided by financing activities	229	557
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect, Total	(12)	358
Cash, restricted cash, and cash equivalents at beginning of period	44	26
Cash, restricted cash, and cash equivalents at end of period	32	384
Supplemental Cash Flow Information
Decrease in capital expenditures not paid	(11)	(16)
Baltimore Gas and Electric Company [Member]
Cash flows from operating activities
Net income (loss)	234	254
Adjustments to reconcile net income to net cash flows provided by operating activities:
Depreciation, amortization, and accretion, including nuclear fuel and energy contract amortization	322	293
Deferred income taxes and amortization of investment tax credits	13	11
Other non-cash operating activities	79	28
Changes in assets and liabilities:
Accounts receivable	(14)	73
Receivables from payables to affiliates, net	(11)	(19)
Inventories	(27)	(9)
Accounts payable and accrued expenses	(12)	(51)
Collateral received (posted), net	190	2
Income taxes	(27)	(27)
Regulatory assets and liabilities, net	(36)	(61)
Pension and non-pension postretirement benefit contributions	(59)	(71)
Other assets and liabilities	24	(35)
Net Cash Provided by (Used in) Operating Activities, Total	676	388
Cash flows from investing activities
Capital expenditures	(578)	(620)
Other investing activities	7	10
Net Cash Provided by (Used in) Investing Activities, Total	(571)	(610)
Cash flows from financing activities
Changes in short-term borrowings	(130)	0
Issuance of long-term debt	500	600
Dividends paid on common stock	(150)	(146)
Contributions from parent	186	0
Other financing activities	(7)	(6)
Net cash flows provided by financing activities	399	448
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect, Total	504	226
Cash, restricted cash, and cash equivalents at beginning of period	55	145
Cash, restricted cash, and cash equivalents at end of period	559	371
Supplemental Cash Flow Information
Decrease in capital expenditures not paid	(21)	(71)
Pepco Holdings LLC [Member]
Cash flows from operating activities
Net income (loss)	230	269
Adjustments to reconcile net income to net cash flows provided by operating activities:
Depreciation, amortization, and accretion, including nuclear fuel and energy contract amortization	459	404
Deferred income taxes and amortization of investment tax credits	(7)	10
Other non-cash operating activities	76	(50)
Changes in assets and liabilities:
Accounts receivable	(92)	(30)
Receivables from payables to affiliates, net	(53)	(22)
Inventories	(7)	3
Accounts payable and accrued expenses	10	(35)
Collateral received (posted), net	403	0
Income taxes	(2)	(1)
Regulatory assets and liabilities, net	(71)	(33)
Pension and non-pension postretirement benefit contributions	(70)	(40)
Other assets and liabilities	(86)	(98)
Net Cash Provided by (Used in) Operating Activities, Total	790	377
Cash flows from investing activities
Capital expenditures	(776)	(889)
Other investing activities	3	(2)
Net Cash Provided by (Used in) Investing Activities, Total	(773)	(891)
Cash flows from financing activities
Changes in short-term borrowings	(425)	(36)
Issuance of long-term debt	700	625
Retirement of long-term debt	(200)	(249)
Increase (Decrease) in Due to Affiliates, Current	17	(12)
Payments of Distributions to Affiliates	(395)	(414)
Proceeds from Contributions from Affiliates	704	560
Other financing activities	(12)	(8)
Net cash flows provided by financing activities	389	466
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect, Total	406	(48)
Cash, restricted cash, and cash equivalents at beginning of period	213	160
Cash, restricted cash, and cash equivalents at end of period	619	112
Supplemental Cash Flow Information
Decrease in capital expenditures not paid	(48)	(41)
Potomac Electric Power Company [Member]
Cash flows from operating activities
Net income (loss)	116	134
Adjustments to reconcile net income to net cash flows provided by operating activities:
Depreciation, amortization, and accretion, including nuclear fuel and energy contract amortization	213	199
Deferred income taxes and amortization of investment tax credits	(7)	10
Other non-cash operating activities	17	(43)
Changes in assets and liabilities:
Accounts receivable	(62)	(23)
Receivables from payables to affiliates, net	(39)	(11)
Inventories	(6)	1
Accounts payable and accrued expenses	6	(26)
Collateral received (posted), net	85	0
Income taxes	(24)	(20)
Regulatory assets and liabilities, net	(36)	(38)
Pension and non-pension postretirement benefit contributions	(7)	(7)
Other assets and liabilities	(15)	(41)
Net Cash Provided by (Used in) Operating Activities, Total	241	135
Cash flows from investing activities
Capital expenditures	(402)	(439)
Other investing activities	2	(2)
Net Cash Provided by (Used in) Investing Activities, Total	(400)	(441)
Cash flows from financing activities
Changes in short-term borrowings	(132)	119
Issuance of long-term debt	400	150
Retirement of long-term debt	(200)	0
Increase (Decrease) in Due to Affiliates, Current	73	9
Dividends paid on common stock	(300)	(123)
Contributions from parent	387	138
Other financing activities	(6)	(2)
Net cash flows provided by financing activities	222	291
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect, Total	63	(15)
Cash, restricted cash, and cash equivalents at beginning of period	68	65
Cash, restricted cash, and cash equivalents at end of period	131	50
Supplemental Cash Flow Information
Decrease in capital expenditures not paid	(24)	(15)
Delmarva Power and Light Company [Member]
Cash flows from operating activities
Net income (loss)	77	86
Adjustments to reconcile net income to net cash flows provided by operating activities:
Depreciation, amortization, and accretion, including nuclear fuel and energy contract amortization	113	104
Deferred income taxes and amortization of investment tax credits	3	4
Other non-cash operating activities	13	(12)
Changes in assets and liabilities:
Accounts receivable	(8)	24
Receivables from payables to affiliates, net	(3)	(12)
Inventories	1	0
Accounts payable and accrued expenses	12	7
Collateral received (posted), net	180	0
Income taxes	6	14
Regulatory assets and liabilities, net	(11)	(13)
Pension and non-pension postretirement benefit contributions	(1)	0
Other assets and liabilities	1	(9)
Net Cash Provided by (Used in) Operating Activities, Total	383	193
Cash flows from investing activities
Capital expenditures	(194)	(211)
Changes in Exelon/PHI intercompany money pool	(73)	(9)
Other investing activities	2	1
Net Cash Provided by (Used in) Investing Activities, Total	(265)	(219)
Cash flows from financing activities
Changes in short-term borrowings	(149)	(146)
Issuance of long-term debt	125	125
Dividends paid on common stock	(56)	(63)
Contributions from parent	144	120
Other financing activities	(4)	(3)
Net cash flows provided by financing activities	60	33
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect, Total	178	7
Cash, restricted cash, and cash equivalents at beginning of period	71	15
Cash, restricted cash, and cash equivalents at end of period	249	22
Supplemental Cash Flow Information
Decrease in capital expenditures not paid	(5)	(14)
Atlantic City Electric Company [Member]
Cash flows from operating activities
Net income (loss)	37	51
Adjustments to reconcile net income to net cash flows provided by operating activities:
Depreciation, amortization, and accretion, including nuclear fuel and energy contract amortization	118	87
Deferred income taxes and amortization of investment tax credits	0	(2)
Other non-cash operating activities	25	(14)
Changes in assets and liabilities:
Accounts receivable	(20)	(30)
Receivables from payables to affiliates, net	(10)	4
Inventories	(2)	2
Accounts payable and accrued expenses	9	(2)
Collateral received (posted), net	137	0
Income taxes	8	2
Regulatory assets and liabilities, net	(11)	18
Pension and non-pension postretirement benefit contributions	(7)	(3)
Other assets and liabilities	(63)	(43)
Net Cash Provided by (Used in) Operating Activities, Total	221	70
Cash flows from investing activities
Capital expenditures	(179)	(239)
Net Cash Provided by (Used in) Investing Activities, Total	(179)	(239)
Cash flows from financing activities
Changes in short-term borrowings	(144)	(9)
Issuance of long-term debt	175	350
Retirement of long-term debt	0	(249)
Dividends paid on common stock	(38)	(229)
Contributions from parent	173	303
Other financing activities	(4)	(4)
Net cash flows provided by financing activities	162	162
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect, Total	204	(7)
Cash, restricted cash, and cash equivalents at beginning of period	29	30
Cash, restricted cash, and cash equivalents at end of period	233	23
Supplemental Cash Flow Information
Decrease in capital expenditures not paid	$ (19)	$ (13)

Consolidated Balance Sheets (Un

Consolidated Balance Sheets (Unaudited) - USD ($) shares in Millions, $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Current Assets
Cash and cash equivalents	$ 816	$ 672
Restricted cash and cash equivalents	961	321
Accounts receivable
Customer accounts receivable	2,219	2,189
Customer allowance for credit losses	(354)	(320)
Customer accounts receivable, net	1,865	1,869
Other accounts receivable	1,403	1,068
Other allowance for credit losses	(81)	(72)
Other accounts receivable, net	1,322	996
Inventories, net
Fossil fuel and emission allowances	133	105
Materials and supplies	491	476
Regulatory assets, current	1,239	1,296
Other	515	387
Current assets of discontinued operations	0	7,835
Total current assets	7,342	13,957
Accumulated depreciation and amortization	15,242	14,430
Property, plant and equipment, net	66,456	64,558
Deferred debits and other assets
Regulatory assets, noncurrent	8,350	8,224
Goodwill	6,630	6,630
Receivable related to Regulatory Agreement Units	2,265	0
Investments	235	250
Other	1,017	885
Property, plant, and equipment, deferred debits, and other assets of discontinued operations	0	38,509
Total deferred debits and other assets	18,497	54,498
Total assets	92,295	133,013
Current Liabilities
Short-term borrowings	2,003	1,248
Long-term debt due within one year	505	2,153
Accounts payable	2,451	2,379
Accrued expenses	1,057	1,137
Payables to affiliates, current	5	5
Regulatory liabilities, current	411	376
Mark-to-market derivative liabilities, current	0	18
Unamortized energy contract liabilities, current	11	89
Other	1,588	766
Current liabilities of discontinued operations	0	7,940
Total current liabilities	8,031	16,111
Long-term debt	35,789	30,749
Long-term debt to financing trusts	390	390
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits	11,240	10,611
Regulatory liabilities, noncurrent	8,513	9,628
Pension obligations	1,406	2,051
Non-pension postretirement benefit obligations	800	811
Asset retirement obligations, noncurrent	275	271
Mark-to-market derivative liabilities, noncurrent	103	201
Unamortized energy contract liabilities, noncurrent	38	146
Other	2,054	1,573
Long-term debt, deferred credits, and other liabilities of discontinued operations	0	25,676
Total deferred credits and other liabilities	24,429	50,968
Liabilities	68,639	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	980	979
Common stock	$ 20,319	$ 20,324
Treasury stock, shares	2	2
Treasury stock, at cost	$ (123)	$ (123)
Retained earnings/Undistributed earnings (losses)	4,161	16,942
Accumulated other comprehensive loss, net	(701)	(2,750)
Total shareholders’ equity	23,656	34,393
Members' Equity [Abstract]
Noncontrolling interests	0	402
Total equity	23,656	34,795
Total liabilities and shareholders’ equity	92,295	133,013
Commonwealth Edison Co [Member]
Current Assets
Cash and cash equivalents	120	131
Restricted cash and cash equivalents	384	210
Accounts receivable
Customer accounts receivable	589	647
Customer allowance for credit losses	(81)	(73)
Customer accounts receivable, net	508	574
Other accounts receivable	448	227
Other allowance for credit losses	(18)	(17)
Other accounts receivable, net	430	210
Receivables from affiliates, current	3	16
Inventories, net
Inventories, net	171	170
Regulatory assets, current	325	335
Other	143	76
Total current assets	2,084	1,722
Accumulated depreciation and amortization	6,400	6,099
Property, plant and equipment, net	26,673	25,995
Deferred debits and other assets
Regulatory assets, noncurrent	2,134	1,870
Goodwill	2,625	2,625
Receivables from affiliates, noncurrent	0	2,761
Receivable related to Regulatory Agreement Units	1,973	0
Investments	6	6
Prepaid pension asset	1,232	1,086
Other	467	405
Total deferred debits and other assets	8,437	8,753
Total assets	37,194	36,470
Current Liabilities
Accounts payable	756	647
Accrued expenses	345	384
Payables to affiliates, current	65	121
Customer deposits	99	99
Regulatory liabilities, current	216	185
Mark-to-market derivative liabilities, current	0	18
Other	253	133
Total current liabilities	1,734	1,587
Long-term debt	10,516	9,773
Long-term debt to financing trusts	205	205
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits	4,852	4,685
Regulatory liabilities, noncurrent	6,111	6,759
Non-pension postretirement benefit obligations	168	169
Asset retirement obligations, noncurrent	145	144
Mark-to-market derivative liabilities, noncurrent	103	201
Other	544	592
Total deferred credits and other liabilities	11,923	12,550
Liabilities	24,378	24,115
Commitments and contingencies
Shareholders' equity
Common stock	1,588	1,588
Retained earnings/Undistributed earnings (losses)	1,817	1,691
Other paid-in capital	9,411	9,076
Total shareholders’ equity	12,816	12,355
Members' Equity [Abstract]
Total liabilities and shareholders’ equity	37,194	36,470
PECO Energy Co [Member]
Current Assets
Cash and cash equivalents	23	36
Restricted cash and cash equivalents	9	8
Accounts receivable
Customer accounts receivable	493	489
Customer allowance for credit losses	(107)	(105)
Customer accounts receivable, net	386	384
Other accounts receivable	138	116
Other allowance for credit losses	(10)	(7)
Other accounts receivable, net	128	109
Receivables from affiliates, current	0	1
Inventories, net
Fossil fuel and emission allowances	55	51
Materials and supplies	48	45
Prepaid utility taxes	85	1
Regulatory assets, current	61	48
Other	36	28
Total current assets	831	711
Accumulated depreciation and amortization	4,021	3,964
Property, plant and equipment, net	11,591	11,117
Deferred debits and other assets
Regulatory assets, noncurrent	1,033	943
Receivables from affiliates, noncurrent	0	597
Receivable related to Regulatory Agreement Units	292	0
Investments	32	34
Prepaid pension asset	405	386
Other	32	36
Total deferred debits and other assets	1,794	1,996
Total assets	14,216	13,824
Current Liabilities
Short-term borrowings	210	0
Long-term debt due within one year	50	350
Accounts payable	525	494
Accrued expenses	161	136
Payables to affiliates, current	29	70
Customer deposits	53	48
Regulatory liabilities, current	75	94
Other	47	35
Total current liabilities	1,150	1,227
Long-term debt	4,142	3,847
Long-term debt to financing trusts	184	184
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits	2,534	2,421
Regulatory liabilities, noncurrent	329	635
Non-pension postretirement benefit obligations	288	286
Asset retirement obligations, noncurrent	29	29
Other	82	83
Total deferred credits and other liabilities	3,262	3,454
Liabilities	8,738	8,712
Commitments and contingencies
Shareholders' equity
Common stock	3,655	3,428
Retained earnings/Undistributed earnings (losses)	1,823	1,684
Total shareholders’ equity	5,478	5,112
Members' Equity [Abstract]
Total liabilities and shareholders’ equity	14,216	13,824
Baltimore Gas and Electric Company [Member]
Current Assets
Cash and cash equivalents	354	51
Restricted cash and cash equivalents	205	4
Accounts receivable
Customer accounts receivable	462	436
Customer allowance for credit losses	(57)	(38)
Customer accounts receivable, net	405	398
Other accounts receivable	122	124
Other allowance for credit losses	(11)	(9)
Other accounts receivable, net	111	115
Receivables from affiliates, current	0	1
Inventories, net
Fossil fuel and emission allowances	68	42
Materials and supplies	54	53
Prepaid utility taxes	0	49
Regulatory assets, current	178	215
Other	10	8
Total current assets	1,385	936
Accumulated depreciation and amortization	4,464	4,299
Property, plant and equipment, net	10,899	10,577
Deferred debits and other assets
Regulatory assets, noncurrent	465	477
Investments	7	14
Prepaid pension asset	307	276
Other	30	44
Total deferred debits and other assets	809	811
Total assets	13,093	12,324
Current Liabilities
Short-term borrowings	0	130
Long-term debt due within one year	250	250
Accounts payable	339	349
Accrued expenses	133	176
Payables to affiliates, current	30	48
Customer deposits	100	97
Regulatory liabilities, current	45	26
Other	224	48
Total current liabilities	1,121	1,124
Long-term debt	4,206	3,711
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits	1,777	1,686
Regulatory liabilities, noncurrent	869	934
Non-pension postretirement benefit obligations	169	175
Asset retirement obligations, noncurrent	26	26
Other	85	98
Total deferred credits and other liabilities	2,926	2,919
Liabilities	8,253	7,754
Commitments and contingencies
Shareholders' equity
Common stock	2,761	2,575
Retained earnings/Undistributed earnings (losses)	2,079	1,995
Total shareholders’ equity	4,840	4,570
Members' Equity [Abstract]
Total liabilities and shareholders’ equity	13,093	12,324
Pepco Holdings LLC [Member]
Current Assets
Cash and cash equivalents	278	136
Restricted cash and cash equivalents	341	77
Accounts receivable
Customer accounts receivable	676	616
Customer allowance for credit losses	(109)	(104)
Customer accounts receivable, net	567	512
Other accounts receivable	291	283
Other allowance for credit losses	(42)	(39)
Other accounts receivable, net	249	244
Receivables from affiliates, current	1	2
Inventories, net
Fossil fuel and emission allowances	10	11
Materials and supplies	217	209
Regulatory assets, current	435	432
Other	90	69
Total current assets	2,188	1,692
Accumulated depreciation and amortization	2,365	2,108
Property, plant and equipment, net	16,915	16,498
Deferred debits and other assets
Regulatory assets, noncurrent	1,714	1,794
Goodwill	4,005	4,005
Investments	139	145
Prepaid pension asset	380	344
Deferred income taxes	6	8
Other	245	258
Total deferred debits and other assets	6,489	6,554
Total assets	25,592	24,744
Current Liabilities
Short-term borrowings	43	468
Long-term debt due within one year	200	399
Accounts payable	574	578
Accrued expenses	246	281
Payables to affiliates, current	50	104
Borrowings from Exelon/PHI intercompany money pool	24	7
Customer deposits	81	81
Regulatory liabilities, current	71	68
Unamortized energy contract liabilities, current	11	89
PPA termination obligation	87	0
Other	580	171
Total current liabilities	1,967	2,246
Long-term debt	7,827	7,148
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits	2,752	2,675
Regulatory liabilities, noncurrent	1,142	1,238
Non-pension postretirement benefit obligations	57	66
Asset retirement obligations, noncurrent	70	70
Unamortized energy contract liabilities, noncurrent	38	146
Other	615	570
Total deferred credits and other liabilities	4,674	4,765
Liabilities	14,468	14,159
Commitments and contingencies
Shareholders' equity
Retained earnings/Undistributed earnings (losses)	(375)	(210)
Members' Equity [Abstract]
Membership interest	11,499	10,795
Total members' equity	11,124	10,585
Total liabilities and shareholders’ equity	25,592	24,744
Potomac Electric Power Company [Member]
Current Assets
Cash and cash equivalents	14	34
Restricted cash and cash equivalents	117	34
Accounts receivable
Customer accounts receivable	328	277
Customer allowance for credit losses	(42)	(37)
Customer accounts receivable, net	286	240
Other accounts receivable	165	160
Other allowance for credit losses	(20)	(16)
Other accounts receivable, net	145	144
Receivables from affiliates, current	9	0
Inventories, net
Inventories, net	125	119
Regulatory assets, current	220	213
Other	12	25
Total current assets	928	809
Accumulated depreciation and amortization	3,970	3,875
Property, plant and equipment, net	8,365	8,104
Deferred debits and other assets
Regulatory assets, noncurrent	478	532
Investments	118	120
Prepaid pension asset	277	279
Other	60	59
Total deferred debits and other assets	933	990
Total assets	10,226	9,903
Current Liabilities
Short-term borrowings	43	175
Long-term debt due within one year	114	313
Accounts payable	269	272
Accrued expenses	124	160
Payables to affiliates, current	29	59
Borrowings from Exelon/PHI intercompany money pool	73	0
Customer deposits	36	35
Regulatory liabilities, current	12	14
Merger related obligation	25	27
Other	149	55
Total current liabilities	874	1,110
Long-term debt	3,528	3,132
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits	1,314	1,275
Regulatory liabilities, noncurrent	507	549
Non-pension postretirement benefit obligations	0	3
Asset retirement obligations, noncurrent	45	45
Other	280	314
Total deferred credits and other liabilities	2,146	2,186
Liabilities	6,548	6,428
Commitments and contingencies
Shareholders' equity
Common stock	2,689	2,302
Retained earnings/Undistributed earnings (losses)	989	1,173
Total shareholders’ equity	3,678	3,475
Members' Equity [Abstract]
Total liabilities and shareholders’ equity	10,226	9,903
Delmarva Power and Light Company [Member]
Current Assets
Cash and cash equivalents	26	28
Restricted cash and cash equivalents	223	43
Accounts receivable
Customer accounts receivable	154	149
Customer allowance for credit losses	(22)	(18)
Customer accounts receivable, net	132	131
Other accounts receivable	55	58
Other allowance for credit losses	(8)	(8)
Other accounts receivable, net	47	50
Receivables from affiliates, current	0	1
Receivable from Exelon/PHI intercompany money pool	73	0
Inventories, net
Fossil fuel and emission allowances	10	11
Materials and supplies	54	54
Prepaid utility taxes	0	20
Regulatory assets, current	68	68
Other	29	16
Total current assets	662	422
Accumulated depreciation and amortization	1,704	1,635
Property, plant and equipment, net	4,661	4,560
Deferred debits and other assets
Regulatory assets, noncurrent	204	212
Prepaid pension asset	156	157
Other	59	61
Total deferred debits and other assets	419	430
Total assets	5,742	5,412
Current Liabilities
Short-term borrowings	0	149
Long-term debt due within one year	84	83
Accounts payable	141	131
Accrued expenses	40	40
Payables to affiliates, current	29	33
Customer deposits	27	28
Regulatory liabilities, current	31	25
Other	239	59
Total current liabilities	591	548
Long-term debt	1,854	1,727
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits	830	803
Regulatory liabilities, noncurrent	415	441
Non-pension postretirement benefit obligations	10	11
Asset retirement obligations, noncurrent	16	16
Other	84	89
Total deferred credits and other liabilities	1,355	1,360
Liabilities	3,800	3,635
Commitments and contingencies
Shareholders' equity
Common stock	1,353	1,209
Retained earnings/Undistributed earnings (losses)	589	568
Total shareholders’ equity	1,942	1,777
Members' Equity [Abstract]
Total liabilities and shareholders’ equity	5,742	5,412
Atlantic City Electric Company [Member]
Current Assets
Cash and cash equivalents	233	29
Restricted cash and cash equivalents	0	0
Accounts receivable
Customer accounts receivable	194	190
Customer allowance for credit losses	(45)	(49)
Customer accounts receivable, net	149	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	38	36
Prepaid utility taxes	40	0
Regulatory assets, current	135	61
Other	7	3
Total current assets	659	333
Accumulated depreciation and amortization	1,491	1,420
Property, plant and equipment, net	3,798	3,729
Deferred debits and other assets
Regulatory assets, noncurrent	535	430
Prepaid pension asset	26	27
Other	34	37
Total deferred debits and other assets	595	494
Total assets	5,052	4,556
Current Liabilities
Short-term borrowings	0	144
Long-term debt due within one year	3	3
Accounts payable	157	165
Accrued expenses	43	44
Payables to affiliates, current	20	31
Customer deposits	18	18
Regulatory liabilities, current	29	28
PPA termination obligation	87	0
Other	149	12
Total current liabilities	506	445
Long-term debt	1,754	1,579
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits	695	682
Regulatory liabilities, noncurrent	197	214
Non-pension postretirement benefit obligations	10	12
Other	143	49
Total deferred credits and other liabilities	1,045	957
Liabilities	3,305	2,981
Commitments and contingencies
Shareholders' equity
Common stock	1,763	1,590
Retained earnings/Undistributed earnings (losses)	(16)	(15)
Total shareholders’ equity	1,747	1,575
Members' Equity [Abstract]
Total liabilities and shareholders’ equity	$ 5,052	$ 4,556

Consolidated Statements of Chan

Consolidated Statements of Changes in Shareholders Equity (Unaudited) - USD ($) shares in Thousands, $ in Millions	Total	Correcting Adjustment [Member]	Common Stock [Member]	Common Stock [Member] Correcting Adjustment [Member]	Treasury Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	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 Paid-in-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] Retained Earnings [Member]	Pepco Holdings LLC [Member] Membership Interest [Member]	Pepco Holdings LLC [Member] Retained Earnings, Unappropriated [Member]	Potomac Electric Power Company [Member]	Potomac Electric Power Company [Member] Common Stock [Member]	Potomac Electric Power Company [Member] Retained Earnings [Member]	Delmarva Power and Light Company [Member]	Delmarva Power and Light Company [Member] Common Stock [Member]	Delmarva Power and 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, 2020	977,466
Beginning balance at Dec. 31, 2020	$ 34,868		$ 19,373		$ (123)	$ 16,735	$ (3,400)	$ 2,283
Beginning 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
Beginning Balance at Dec. 31, 2020																			$ 10,044	$ (68)	$ 10,112
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	$ (264)					(289)		25	197		197		167		167	209		209	128	128			59		59	56		56	14		14
Long -Term Incentive Plan Activity (shares)	640
Long-Term Incentive Plan Activity		$ 5		$ 5
Employee stock purchase plan issuances (shares)	902
Employee stock purchase plan issuances	$ 34		34
Changes in equity of noncontrolling interests	$ (10)							(10)
Common Stock, Dividends, Per Share, Declared	$ 0.38
Common stock dividends	$ (374)					(374)			(127)		(127)		(85)		(85)	(74)		(74)					(28)		(28)	(40)		(40)	(14)		(14)
Other comprehensive income (loss), net of income taxes	$ 54						54
Distributions to member																			(81)	(81)
Contributions from parent									198			198							560		560		138	138		120	120		303	303
Ending balance (in shares) at Mar. 31, 2021	979,008
Ending balance at Mar. 31, 2021	$ 34,313		19,412		(123)	16,072	(3,346)	2,298
Ending Balance at Mar. 31, 2021									11,597	1,588	1,526	8,483	4,615	3,014	1,601	4,332	2,318	2,014					3,372	2,196	1,176	1,812	1,209	603	1,701	1,574	127
Ending Balance at Mar. 31, 2021																			10,651	(21)	10,672
Beginning balance (in shares) at Dec. 31, 2020	977,466
Beginning balance at Dec. 31, 2020	$ 34,868		19,373		(123)	16,735	(3,400)	2,283
Beginning 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
Beginning Balance at Dec. 31, 2020																			10,044	(68)	10,112
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	211								390				271			254			269				134			86			51
Other comprehensive income (loss), net of income taxes	$ 111						111
Ending balance (in shares) at Jun. 30, 2021	979,665
Ending balance at Jun. 30, 2021	$ 34,500		19,454		(123)	16,098	(3,289)	2,360
Ending Balance at Jun. 30, 2021									11,860	1,588	1,592	8,680	5,030	3,409	1,621	4,305	2,318	1,987					3,352	2,196	1,156	1,819	1,209	610	1,523	1,574	(51)
Ending Balance at Jun. 30, 2021																			10,459		10,672	$ (213)
Beginning balance (in shares) at Mar. 31, 2021	979,008
Beginning balance at Mar. 31, 2021	$ 34,313		19,412		(123)	16,072	(3,346)	2,298
Beginning Balance at Mar. 31, 2021									11,597	1,588	1,526	8,483	4,615	3,014	1,601	4,332	2,318	2,014					3,372	2,196	1,176	1,812	1,209	603	1,701	1,574	127
Beginning Balance at Mar. 31, 2021																			10,651	(21)	10,672
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	$ 476					401		75	192		192		104		104	45		45	141	141			75		75	30		30	37		37
Long -Term Incentive Plan Activity (shares)	237
Long-Term Incentive Plan Activity	$ 24		24
Employee stock purchase plan issuances (shares)		420
Employee stock purchase plan issuances	18		18
Changes in equity of noncontrolling interests	$ (13)							(13)
Common Stock, Dividends, Per Share, Declared	$ 0.38
Common stock dividends	$ (375)					(375)			(126)		(126)		(84)		(84)	(72)		(72)					(95)		(95)	(23)		(23)	(215)		(215)
Other comprehensive income (loss), net of income taxes	$ 57						57
Distributions to member																			(333)	(333)
Contributions from parent									197			197	395	395
Ending balance (in shares) at Jun. 30, 2021	979,665
Ending balance at Jun. 30, 2021	$ 34,500		19,454		(123)	16,098	(3,289)	2,360
Ending Balance at Jun. 30, 2021									11,860	1,588	1,592	8,680	5,030	3,409	1,621	4,305	2,318	1,987					3,352	2,196	1,156	1,819	1,209	610	1,523	1,574	(51)
Ending Balance at Jun. 30, 2021																			10,459		10,672	(213)
Beginning balance (in shares) at Dec. 31, 2021	981,291
Beginning balance at Dec. 31, 2021	$ 34,795		20,324		(123)	16,942	(2,750)	402
Beginning 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)
Beginning Balance at Dec. 31, 2021																			10,585	(210)	10,795
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	$ 598					597		1	188		188		206		206	198		198	130	130			46		46	56		56	26		26
Long -Term Incentive Plan Activity (shares)	540
Long-Term Incentive Plan Activity	$ (13)		(13)
Employee stock purchase plan issuances (shares)	211
Employee stock purchase plan issuances	$ 9		9
Changes in equity of noncontrolling interests	(7)							(7)
Distribution of Constellation	$ (11,573)		(21)			(13,179)	2,023	(396)
Common Stock, Dividends, Per Share, Declared	$ 0.34
Common stock dividends	$ (332)					(332)			(144)		(144)		(100)		(100)	(76)		(76)					(42)		(42)	(41)		(41)	(19)		(19)
Other comprehensive income (loss), net of income taxes	$ 14						14
Distributions to member																			(102)	(102)
Contributions from parent									167			167	227	227					704		704		387	387		144	144		173	173
Ending balance (in shares) at Mar. 31, 2022	982,042
Ending balance at Mar. 31, 2022	$ 23,491		20,299		(123)	4,028	(713)	0
Ending Balance at Mar. 31, 2022									12,566	1,588	1,735	9,243	5,445	3,655	1,790	4,692	2,575	2,117					3,866	2,689	1,177	1,936	1,353	583	1,755	1,763	(8)
Ending Balance at Mar. 31, 2022																			11,317	(182)	11,499
Beginning balance (in shares) at Dec. 31, 2021	981,291
Beginning balance at Dec. 31, 2021	$ 34,795		20,324		(123)	16,942	(2,750)	402
Beginning 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)
Beginning Balance at Dec. 31, 2021																			10,585	(210)	10,795
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	1,063								415				339			234			230				116			77			37
Other comprehensive income (loss), net of income taxes	$ 26						26
Ending balance (in shares) at Jun. 30, 2022	982,305
Ending balance at Jun. 30, 2022	$ 23,656		20,319		(123)	4,161	(701)	0
Ending Balance at Jun. 30, 2022	$ 23,656								12,816	1,588	1,817	9,411	5,478	3,655	1,823	4,840	2,761	2,079					3,678	2,689	989	1,942	1,353	589	1,747	1,763	(16)
Ending Balance at Jun. 30, 2022																			11,124		11,499	(375)
Beginning balance (in shares) at Mar. 31, 2022	982,042
Beginning balance at Mar. 31, 2022	$ 23,491		20,299		(123)	4,028	(713)	0
Beginning Balance at Mar. 31, 2022									12,566	1,588	1,735	9,243	5,445	3,655	1,790	4,692	2,575	2,117					3,866	2,689	1,177	1,936	1,353	583	1,755	1,763	(8)
Beginning Balance at Mar. 31, 2022																			11,317	(182)	11,499
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	$ 465					465		0	227		227		133		133	37		37	100	100			70		70	21		21	11		11
Long -Term Incentive Plan Activity (shares)	21
Long-Term Incentive Plan Activity	$ 10		10
Employee stock purchase plan issuances (shares)	242
Employee stock purchase plan issuances	$ 10		10
Changes in equity of noncontrolling interests	$ 0							0
Common Stock, Dividends, Per Share, Declared	$ 0.34
Common stock dividends	$ (332)					(332)			(145)		(145)		(100)		(100)	(75)		(75)					(258)		(258)	(15)		(15)	(19)		(19)
Other comprehensive income (loss), net of income taxes	$ 12						12
Distributions to member																			(293)	$ (293)
Contributions from parent									168			168				186	186
Ending balance (in shares) at Jun. 30, 2022	982,305
Ending balance at Jun. 30, 2022	$ 23,656		$ 20,319		$ (123)	$ 4,161	$ (701)	$ 0
Ending Balance at Jun. 30, 2022	$ 23,656								$ 12,816	$ 1,588	$ 1,817	$ 9,411	$ 5,478	$ 3,655	$ 1,823	$ 4,840	$ 2,761	$ 2,079					$ 3,678	$ 2,689	$ 989	$ 1,942	$ 1,353	$ 589	$ 1,747	$ 1,763	$ (16)
Ending Balance at Jun. 30, 2022																			$ 11,124		$ 11,499	$ (375)

Significant Accounting Policies

Significant Accounting Policies (All Registrants)	6 Months Ended
Significant Accounting Policies (All Registrants)	Jun. 30, 2022
Accounting Policies [Abstract]
Significant Accounting Policies (All Registrants)	Significant Accounting Policies (All Registrants) Description of Business 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 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 & 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 This is a combined quarterly 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, accounting, 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” in the consolidated financial statements and include intercompany eliminations unless otherwise disclosed. The accompanying consolidated financial statements as of June 30, 2022 and for the three and six months ended June 30, 2022 and 2021 are unaudited but, in the opinion of the management of each Registrant include all adjustments that are considered necessary for a fair statement of the Registrants’ respective financial statements in accordance with GAAP. All adjustments are of a normal, recurring nature, except as otherwise disclosed. The December 31, 2021 Consolidated Balance Sheets were derived from audited financial statements. The interim financial statements are to be read in conjunction with prior annual financial statements and notes. Additionally, financial results for interim periods are not necessarily indicative of results that may be expected for any other interim period or for the fiscal year ending December 31, 2022. These Combined Notes to Consolidated Financial Statements have been prepared pursuant to the rules and regulations of the SEC for Quarterly Reports on Form 10-Q. Certain information and note disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations. 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, shareholders' equity, and cash flows related to Constellation 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.

Discontinued Operations (Exelon

Discontinued Operations (Exelon)	6 Months Ended
Discontinued Operations (Exelon)	Jun. 30, 2022
Discontinued Operations and Disposal Groups [Abstract]
Disposal Groups, Including Discontinued Operations, Disclosure [Text Block]	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 is 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 10 — 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 10 — 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 three months ended June 30, 2022, the amounts Exelon billed Constellation and Constellation billed Exelon for these services were $69 million recorded in Other income, net and $11 million recorded in Operating and maintenance expense, respectively. Additionally, for the period from February 1, 2022 to June 30, 2022, the amounts Exelon billed Constellation and Constellation billed Exelon for these services were $125 million recorded in Other income, net and $20 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 7. Income Taxes for additional information. In addition, the Utility Registrants will continue to incur expenses from transactions with Generation 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 Generation to provide a portion of ComEd’s electric supply requirements. ComEd also purchased RECs and ZECs from Generation. • 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. • BGE received a portion of its energy requirements from Generation under its MDPSC-approved market-based SOS and gas commodity programs. • Pepco received electric supply from Generation under contracts executed through Pepco’s competitive procurement process approved by the MDPSC and DCPSC. • DPL received a portion of its energy requirements from Generation under its MDPSC and DEPSC approved market-based SOS commodity programs. • ACE received electric supply from Generation under contracts executed through ACE’s competitive procurement process approved by the NJBPU. ComEd and PECO also have receivables with Generation as a result of the nuclear decommissioning contractual construct whereby, to the extent NDT funds are greater than the underlying ARO at the end of decommissioning, such amounts are due back to ComEd and PECO, as applicable, for payment to their respective customers. See Note 9 — Asset Retirement Obligations of the Combined Notes to Consolidated Financial Statements of the 2021 Recast Form 10-K and Note 15 — 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 three and six months ended June 30, 2022 and June 30, 2021. 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 are 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. Three Months Ended Six Months Ended 2021 2022 2021 Operating revenues Competitive business revenues $ 3,900 $ 1,855 $ 9,165 Competitive business revenues from affiliates 255 161 549 Total operating revenues 4,155 2,016 9,714 Operating expenses Competitive businesses purchased power and fuel 1,947 1,138 6,557 Operating and maintenance (a) 1,382 371 2,287 Depreciation and amortization 930 94 1,869 Taxes other than income taxes 118 44 239 Total operating expenses 4,377 1,647 10,952 Gain on sales of assets and businesses 8 10 79 Operating income (loss) (214) 379 (1,159) Other income and (deductions) Interest expense, net (72) (20) (140) Other, net 508 (281) 675 Total other income and (deductions) 436 (301) 535 Income (loss) before income taxes 222 78 (624) Income taxes 71 (40) 13 Equity in losses of unconsolidated affiliates (1) (1) (3) Net income (loss) 150 117 (640) Net income attributable to noncontrolling interests 75 1 99 Net income (loss) from discontinued operations $ 75 $ 116 $ (739) __________ (a) Includes transaction and transition costs related to the separation of $52 million for the six months ended June 30, 2022 and $4 million and $7 million for the three and six months ended June 30, 2021, respectively. See discussion above for additional information. There were no assets and liabilities of discontinued operations included in Exelon’s Consolidated Balance Sheet as of June 30, 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 six months ended June 30, 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 Sheet 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 six months ended June 30, 2022 and June 30, 2021. Six Months Ended 2022 2021 Non-cash items included in net income (loss) from discontinued operations: Depreciation, amortization, and accretion, including nuclear fuel and energy contract amortization $ 207 $ 2,686 Asset impairments — 493 Gain on sales of assets and businesses 9 (79) Deferred income taxes and amortization of investment tax credits (143) (268) Net fair value changes related to derivatives (59) (490) Net realized and unrealized losses (gains) on NDT fund investments 205 (376) Net unrealized losses (gains) on equity investments 16 (96) Other decommissioning-related activity 36 (636) Cash flows from investing activities: Capital expenditures (227) (731) Collection of DPP 169 2,209 Supplemental cash flow information: Decrease in capital expenditures not paid (128) (66) Increase in DPP 348 1,958 Increase in PP&E related to ARO update 335 —

Regulatory Matters (All Registr

Regulatory Matters (All Registrants)	6 Months Ended
Regulatory Matters (All Registrants)	Jun. 30, 2022
Regulated Operations [Abstract]
Regulatory Matters (All Registrants)	Regulatory Matters (All Registrants) As discussed in Note 3 — Regulatory Matters of the 2021 Recast Form 10-K, the Registrants are involved in rate and regulatory proceedings at FERC and their state commissions. The following discusses developments in 2022 and updates to the 2021 Recast Form 10-K. 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 PECO - Pennsylvania March 30, 2021 Electric 246 132 N/A (b) November 18, 2021 January 1, 2022 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 (f) September 1, 2021 (amended December 23, 2021) Electric 27 13 9.60 % March 2, 2022 March 2, 2022 ACE - New Jersey (g) December 9, 2020 (amended February 26, 2021) Electric 67 41 9.60 % July 14, 2021 January 1, 2022 __________ (a) 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. (b) The PECO electric base rate case proceeding was resolved through a settlement agreement, which did not specify an approved ROE. (c) Reflects a three-year cumulative multi-year plan for 2021 through 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. BGE proposed to use certain tax benefits to fully offset the increases in 2021 and 2022 and partially offset the increase in 2023. 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 increases. Whether certain tax benefits will be used to offset the customer rate increases in 2023 has not been decided, and BGE cannot predict the outcome. (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 for the 12-month period ending March 31, 2023. Whether certain tax benefits will be used to offset the customer rate increases for the 12-month period ending 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) 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) April 15, 2022 Electric $ 199 7.85 % Fourth quarter of 2022 PECO - Pennsylvania March 31, 2022 Natural Gas 82 10.95 % Fourth quarter of 2022 DPL - Delaware (b) January 14, 2022 (amended February 28, 2022) Natural Gas 15 10.30 % First quarter of 2023 DPL - Maryland (c) May 19, 2022 Electric 38 10.25 % Fourth quarter of 2022 __________ (a) ComEd's 2023 requested revenue requirement 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 average monthly 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 average monthly yields for 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 as a result of the law authorizing the rate setting process sunsetting at the end of 2022. See Note 3 - Regulatory Matters of the 2021 Recast Form 10-K for additional information on ComEd's transition away from the electric distribution formula rate. (b) The rates will go into effect on August 14, 2022, subject to refund. (c) Reflects a three-year cumulative multi-year plan for January 1, 2023 to December 31, 2025 and total requested revenue requirement increases, before offsets, of $23 million effective January 1, 2023, $8 million effective January 1, 2024, and $7 million effective January 1, 2025, to recover capital investments made in 2021 and planned capital investments through the end of 2025. DPL is proposing the acceleration of refunds for certain tax benefits to partially offset the customer rate increases by $12 million and $8 million in 2023 and 2024, respectively. 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 update: 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 multi-year plan 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. 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 between June 1, 2022 and May 31, 2027 and all its costs of doing so will be recovered through a new rider. 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 $255 million as of June 30, 2022 for the difference between customer credits issued and the credit to be received from the participating nuclear plants. 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, 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 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. An 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. See Note 3 — Regulatory Matters of the 2021 Recast Form 10-K for additional information on CEJA (referred to as Clean Energy Law). Energy Efficiency Formula Rate (Exelon and ComEd). ComEd filed its annual energy efficiency formula rate update with the ICC on May 25, 2022. The filing establishes the revenue requirement used to set the rates that will take effect in January 2023 after the ICC's review and approval. The requested revenue requirement update is based on a reconciliation of the 2021 actual costs plus projected 2023 expenditures. Initial Revenue Requirement Increase Annual Reconciliation Decrease Total Revenue Requirement Increase Requested Return on Rate Base (a) Requested ROE $ 66 $ (16) $ 50 5.94 % 7.85 % __________ (a) The requested revenue requirement increase 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. For the 2021 reconciliation year, the requested revenue requirement 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. New Jersey Regulatory Matters 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 June 30, 2022, the $180 million liability for the contract termination fee consists of $87 million and $93 million included in Other current liabilities and Other deferred credits and other liabilities, respectively, in Exelon's Consolidated Balance Sheet. The current and noncurrent liability is included in PPA termination obligation and Other deferred credits and other liabilities, respectively, in PHI's and ACE's Consolidated Balance Sheets. For the six months ended June 30, 2022, ACE has paid $23 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. Regulatory Assets and Liabilities The Utility Registrants' regulatory assets and liabilities have not changed materially since December 31, 2021, unless noted below. See Note 3 — Regulatory Matters of the 2021 Recast Form 10-K for additional information on the specific regulatory assets and liabilities. ComEd . Regulatory assets increased $254 million primarily due to an increase of $255 million in the CMC regulatory asset, as discussed in CEJA above, $89 million in the Electric Distribution Formula Rate Annual Reconciliations regulatory asset, and $29 million in the Energy Efficiency Costs regulatory asset partially offset by a decrease of $116 million in the Renewable Energy regulatory asset. Regulatory liabilities decreased $617 million primarily due to a decrease of $788 million in the Decommissioning the Regulatory Agreement Units regulatory liability and $45 million in the Deferred Income Taxes regulatory liability partially offset by an increase of $162 million in the Renewable Portfolio Standards Costs regulatory liability and $33 million in the Removal Costs regulatory liability. PECO. Regulatory assets increased $103 million primarily due to an increase of $99 million in the Deferred Income Taxes regulatory asset. Regulatory liabilities decreased $325 million primarily due to a decrease of $305 million in the Decommissioning the Regulatory Agreement Units regulatory liability and $12 million in the Electric Energy and Natural Gas Costs regulatory liability. BGE. Regulatory assets decreased $49 million primarily due to a decrease of $20 million in the Under-recovered revenue decoupling regulatory asset, $14 million in the Electric Energy and Natural Gas Costs regulatory asset, and $13 million in the Energy Efficiency and Demand Response Programs regulatory asset. Pepco. Regulatory assets decreased $47 million primarily due to a decrease of $20 million in the Under-recovered revenue decoupling regulatory asset, $17 million in the DC PLUG Charge regulatory asset, and $10 million in the Energy Efficiency and Demand Response Programs regulatory asset. Regulatory liabilities decreased $44 million primarily due to a decrease of $46 million in the Deferred Income Taxes regulatory liability. ACE. Regulatory assets increased $179 million primarily due to an increase in the Electric Energy Costs regulatory asset as a result of the PPA termination. Regulatory liabilities decreased $16 million primarily due to a decrease of $13 million in the Deferred Income Taxes regulatory liability. Capitalized Ratemaking Amounts Not Recognized 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 June 30, 2022 $ 49 $ 4 $ — $ 32 $ 13 $ 11 $ 2 $ — December 31, 2021 43 1 — 37 5 3 2 — __________ (a) Reflects ComEd's unrecognized equity returns earned for ratemaking purposes on its energy efficiency and electric distribution formula rate regulatory assets. (b) BGE's authorized amounts capitalized for ratemaking purposes primarily relate to earnings on shareholder's investment on its AMI programs. (c) Pepco's and DPL's authorized amounts capitalized for ratemaking purposes relate to earnings on shareholder's investment on their respective AMI Programs and Energy Efficiency and Demand Response Programs, and for Pepco District of Columbia revenue decoupling program. The earnings on energy efficiency are on Pepco District of Columbia and DPL Delaware programs only.

Revenue from Contracts with Cus

Revenue from Contracts with Customers (All Registrants)	6 Months Ended
Revenue from Contracts with Customers (All Registrants)	Jun. 30, 2022
Revenue from Contract with Customer [Abstract]
Revenue from Contracts with Customers (All Registrants)	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. See Note 4 — Revenue from Contracts with Customers of the 2021 Recast Form 10-K for additional information regarding the primary sources of revenue for the Registrants. 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 their Consolidated Balance Sheets. For PHI, Pepco, DPL, and ACE these contract liabilities primarily relate to upfront consideration received in the third quarter of 2020 for a collaborative arrangement with an unrelated owner and manager of communication infrastructure. 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 for the three and six months ended June 30, 2022 and 2021. As of June 30, 2022 and December 31, 2021, ComEd's, PECO's, and BGE's contract liabilities were immaterial. Exelon (a) PHI (a) Pepco (a) DPL ACE (a) Balance as of December 31, 2021 $ 109 $ 109 $ 87 $ 11 $ 11 Revenues recognized (2) (2) (2) — — Balance as of March 31, 2022 107 107 85 11 11 Revenues recognized (2) (2) (1) — (1) Balance as of June 30, 2022 $ 105 $ 105 $ 84 $ 11 $ 10 Exelon (a) PHI (a) Pepco (a) DPL (a) ACE (a) Balance as of December 31, 2020 $ 118 $ 118 $ 94 $ 12 $ 12 Revenues recognized (2) (2) (2) — — Balance as of March 31, 2021 116 116 92 12 12 Revenues recognized (3) (3) (1) (1) (1) Balance as of June 30, 2021 $ 113 $ 113 $ 91 $ 11 $ 11 __________ (a) Revenues recognized in the three and six months ended June 30, 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 June 30, 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. 2022 2023 2024 2025 2026 and thereafter Total Exelon $ 4 $ 8 $ 6 $ 5 $ 82 $ 105 PHI 4 8 6 5 82 105 Pepco 3 6 5 5 65 84 DPL 1 1 — — 9 11 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)	6 Months Ended
Segment Information (All Registrants)	Jun. 30, 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. An analysis and reconciliation of the Registrants’ reportable segment information to the respective information in the consolidated financial statements for the three and six months ended June 30, 2022 and 2021 is as follows: Three Months Ended June 30, 2022 and 2021 ComEd PECO BGE PHI Other (a) Intersegment Exelon Operating revenues (b) : 2022 Electric revenues $ 1,425 $ 708 $ 629 $ 1,182 $ — $ (6) $ 3,938 Natural gas revenues — 108 157 37 — (1) 301 Shared service and other revenues — — — 2 384 (386) — Total operating revenues $ 1,425 $ 816 $ 786 $ 1,221 $ 384 $ (393) $ 4,239 2021 Electric revenues $ 1,517 $ 610 $ 558 $ 1,113 $ — $ (9) $ 3,789 Natural gas revenues — 83 124 24 — — 231 Shared service and other revenues — — — 3 524 (527) — Total operating revenues $ 1,517 $ 693 $ 682 $ 1,140 $ 524 $ (536) $ 4,020 Intersegment revenues (c) : 2022 $ 3 $ 1 $ 3 $ 2 $ 384 $ (393) $ — 2021 5 2 7 4 522 (535) 5 Depreciation and amortization: 2022 $ 328 $ 93 $ 152 $ 240 $ 16 $ 1 $ 830 2021 296 87 141 194 18 — 736 Operating expenses: 2022 $ 1,039 $ 639 $ 717 $ 1,066 $ 460 $ (378) $ 3,543 2021 1,196 552 620 955 495 (374) 3,444 Interest expense, net: 2022 $ 104 $ 43 $ 36 $ 73 $ 101 $ 1 $ 358 2021 98 42 34 67 83 — 324 Income (loss) from continuing operations before income taxes: 2022 $ 293 $ 142 $ 38 $ 101 $ (62) $ (1) $ 511 2021 238 106 37 138 (46) (144) 329 Income Taxes: 2022 $ 66 $ 9 $ 1 $ 1 $ (31) $ — $ 46 2021 46 2 (8) (3) (27) (7) 3 Net income (loss) from continuing operations: 2022 $ 227 $ 133 $ 37 $ 100 $ (31) $ (1) $ 465 2021 192 104 45 141 (19) (137) 326 Capital Expenditures: 2022 $ 591 $ 314 $ 275 $ 367 $ 38 $ — $ 1,585 2021 549 282 284 433 15 — 1,563 __________ (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 14 — Supplemental Financial Information for additional information on total utility taxes. (c) See Note 15 — Related Party Transactions for additional information on intersegment revenues. PHI: Pepco DPL ACE Other (a) Intersegment PHI Operating revenues (b) : 2022 Electric revenues $ 581 $ 295 $ 309 $ — $ (3) $ 1,182 Natural gas revenues — 37 — — — 37 Shared service and other revenues — — — 98 (96) 2 Total operating revenues $ 581 $ 332 $ 309 $ 98 $ (99) $ 1,221 2021 Electric revenues $ 523 $ 274 $ 319 $ — $ (3) $ 1,113 Natural gas revenues — 24 — — — 24 Shared service and other revenues — — — 95 (92) 3 Total operating revenues $ 523 $ 298 $ 319 $ 95 $ (95) $ 1,140 Intersegment revenues (c) : 2022 $ 2 $ 2 $ 1 $ 98 $ (101) $ 2 2021 1 2 1 95 (95) 4 Depreciation and amortization: 2022 $ 105 $ 56 $ 72 $ 7 $ — $ 240 2021 96 51 40 7 — 194 Operating expenses: 2022 $ 487 $ 296 $ 283 $ 99 $ (99) $ 1,066 2021 429 255 269 97 (95) 955 Interest expense, net: 2022 $ 38 $ 17 $ 17 $ 1 $ — $ 73 2021 35 16 14 2 — 67 Income (loss) before income taxes: 2022 $ 69 $ 23 $ 11 $ (2) $ — $ 101 2021 72 31 36 (1) — 138 Income Taxes: 2022 $ (1) $ 2 $ — $ — $ — $ 1 2021 (3) 1 (1) — — (3) Net income (loss): 2022 $ 70 $ 21 $ 11 $ (2) $ — $ 100 2021 75 30 37 (1) — 141 Capital Expenditures: 2022 $ 184 $ 91 $ 92 $ — $ — $ 367 2021 219 99 116 (1) — 433 __________ (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 14 — 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. Three Months Ended June 30, 2022 Revenues from contracts with customers ComEd PECO BGE PHI Pepco DPL ACE Electric revenues Residential $ 819 $ 431 $ 334 $ 548 $ 234 $ 155 $ 159 Small commercial & industrial 312 126 70 140 35 51 54 Large commercial & industrial 11 72 129 332 250 30 52 Public authorities & electric railroads 5 7 7 15 8 3 4 Other (a) 234 68 99 164 54 57 55 Total electric revenues (b) $ 1,381 $ 704 $ 639 $ 1,199 $ 581 $ 296 $ 324 Natural gas revenues Residential $ — $ 71 $ 96 $ 17 $ — $ 17 $ — Small commercial & industrial — 29 18 8 — 8 — Large commercial & industrial — — 35 3 — 3 — Transportation — 6 — 3 — 3 — Other (c) — 2 12 6 — 6 — Total Natural gas revenues (d) $ — $ 108 $ 161 $ 37 $ — $ 37 $ — Total revenues from contracts with customers $ 1,381 $ 812 $ 800 $ 1,236 $ 581 $ 333 $ 324 Other revenues Revenues from alternative revenue programs $ 35 $ — $ (20) $ (17) $ (1) $ (2) $ (15) Other electric revenues (e) 9 4 4 2 1 1 — Other natural gas revenues (e) — — 2 — — — — Total other revenues $ 44 $ 4 $ (14) $ (15) $ — $ (1) $ (15) Total revenues for reportable segments $ 1,425 $ 816 $ 786 $ 1,221 $ 581 $ 332 $ 309 Three Months Ended June 30, 2021 Revenues from contracts with customers ComEd PECO BGE PHI Pepco DPL ACE Electric revenues Residential $ 759 $ 383 $ 299 $ 537 $ 223 $ 147 $ 167 Small commercial & industrial 377 99 60 124 32 46 46 Large commercial & industrial 138 59 108 257 188 22 47 Public authorities & electric railroads 11 8 7 17 10 3 4 Other (a) 214 54 87 139 50 46 43 Total electric revenues (b) $ 1,499 $ 603 $ 561 $ 1,074 $ 503 $ 264 $ 307 Natural gas revenues Residential $ — $ 55 $ 81 $ 12 $ — $ 12 $ — Small commercial & industrial — 22 13 6 — 6 — Large commercial & industrial — — 27 1 — 1 — Transportation — 5 — 3 — 3 — Other (c) — 1 6 2 — 2 — Total natural gas revenues (d) $ — $ 83 $ 127 $ 24 $ — $ 24 $ — Total revenues from contracts with customers $ 1,499 $ 686 $ 688 $ 1,098 $ 503 $ 288 $ 307 Other revenues Revenues from alternative revenue programs $ 9 $ 7 $ (10) $ 41 $ 19 $ 10 $ 12 Other electric revenues (e) 9 — 3 1 1 — — Other natural gas revenues (e) — — 1 — — — — Total other revenues $ 18 $ 7 $ (6) $ 42 $ 20 $ 10 $ 12 Total revenues for reportable segments $ 1,517 $ 693 $ 682 $ 1,140 $ 523 $ 298 $ 319 __________ (a) Includes revenues from transmission revenue from PJM, wholesale electric revenue and mutual assistance revenue. (b) Includes operating revenues from affiliates in 2022 and 2021 respectively of: • $3 million, $5 million at ComEd • $1 million, $1 million at PECO • $2 million, $4 million at BGE • $2 million, $4 million at PHI • $2 million, $1 million at Pepco • $2 million, $2 million at DPL • $1 million, $1 million at ACE (c) Includes revenues from off-system natural gas sales. (d) Includes operating revenues from affiliates in 2022 and 2021 respectively of: • less than $1 million, less than $1 million at PECO • $1 million, $3 million at BGE (e) Includes late payment charge revenues. Six Months Ended June 30, 2022 and 2021 ComEd PECO BGE PHI Other (a) Intersegment Exelon Operating revenues (b) : 2022 Electric revenues $ 3,158 $ 1,449 $ 1,366 $ 2,501 $ — $ (14) $ 8,460 Natural gas revenues — 414 574 120 — (2) 1,106 Shared service and other revenues — — — 5 961 (966) — Total operating revenues $ 3,158 $ 1,863 $ 1,940 $ 2,626 $ 961 $ (982) $ 9,566 2021 Electric revenues $ 3,052 $ 1,271 $ 1,190 $ 2,283 $ — $ (16) $ 7,780 Natural gas revenues — 311 466 95 — — 872 Shared service and other revenues — — — 6 1,013 (1,019) — Total operating revenues $ 3,052 $ 1,582 $ 1,656 $ 2,384 $ 1,013 $ (1,035) $ 8,652 Intersegment revenues (c) : 2022 $ 8 $ 2 $ 10 $ 6 $ 961 $ (981) $ 6 2021 11 4 13 7 1,010 (1,033) 12 Depreciation and amortization: 2022 $ 649 $ 185 $ 322 $ 459 $ 32 $ — $ 1,647 2021 589 173 293 404 35 — 1,494 Operating expenses: 2022 $ 2,444 $ 1,432 $ 1,636 $ 2,282 $ 1,086 $ (909) $ 7,971 2021 2,406 1,231 1,372 2,013 943 (713) 7,252 Interest expense, net: 2022 $ 204 $ 84 $ 71 $ 143 $ 195 $ — $ 697 2021 193 80 67 134 169 — 643 Income (loss) from continuing operations before income taxes: 2022 $ 534 $ 363 $ 244 $ 238 $ (125) $ (45) $ 1,209 2021 475 283 233 273 (80) (292) 892 Income Taxes: 2022 $ 119 $ 24 $ 10 $ 8 $ 114 $ (12) $ 263 2021 85 12 (21) 5 (19) (20) 42 Net income (loss) from continuing operations: 2022 $ 415 $ 339 $ 234 $ 230 $ (239) $ (33) $ 946 2021 390 271 254 269 (61) (272) 851 Capital Expenditures: 2022 $ 1,208 $ 658 $ 578 $ 776 $ 60 $ — $ 3,280 2021 1,162 577 620 889 61 — 3,309 Total assets: June 30, 2022 $ 37,194 $ 14,216 $ 13,093 $ 25,592 $ 6,345 $ (4,145) $ 92,295 December 31, 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 14 — Supplemental Financial Information for additional information on total utility taxes. (c) See Note 15 — Related Party Transactions for additional information on intersegment revenues. PHI: Pepco DPL ACE Other (a) Intersegment PHI Operating revenues (b) : 2022 Electric revenues $ 1,195 $ 643 $ 658 $ — $ 5 $ 2,501 Natural gas revenues — 120 — — — 120 Shared service and other revenues — — — 205 (200) 5 Total operating revenues $ 1,195 $ 763 $ 658 $ 205 $ (195) $ 2,626 2021 Electric revenues $ 1,076 $ 585 $ 629 $ — $ (7) $ 2,283 Natural gas revenues — 95 — — — 95 Shared service and other revenues — — — 189 (183) 6 Total operating revenues $ 1,076 $ 680 $ 629 $ 189 $ (190) $ 2,384 Intersegment revenues (c) : 2022 $ 2 $ 3 $ 2 $ 195 $ (196) $ 6 2021 3 4 1 189 (190) 7 Depreciation and amortization: 2022 $ 213 $ 113 $ 118 $ 15 $ — $ 459 2021 199 104 87 14 — 404 Operating expenses: 2022 $ 1,034 $ 653 $ 593 $ 197 $ (195) $ 2,282 2021 895 564 552 192 (190) 2,013 Interest expense, net: 2022 $ 74 $ 33 $ 32 $ 5 $ (1) $ 143 2021 69 30 29 6 — 134 Income (loss) before income taxes: 2022 $ 113 $ 83 $ 38 $ 4 $ — $ 238 2021 137 92 50 (6) — 273 Income Taxes: 2022 $ (3) $ 6 $ 1 $ 4 $ — $ 8 2021 3 6 (1) (3) — 5 Net income (loss): 2022 $ 116 $ 77 $ 37 $ — $ — $ 230 2021 134 86 51 (2) — 269 Capital Expenditures: 2022 $ 402 $ 194 $ 179 $ 1 $ — $ 776 2021 439 211 239 — — 889 Total assets: June 30, 2022 $ 10,226 $ 5,742 $ 5,052 $ 4,775 $ (203) $ 25,592 December 31, 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 14 — 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. Six Months Ended June 30, 2022 Revenues from contracts with customers ComEd PECO BGE PHI Pepco DPL ACE Electric revenues Residential $ 1,675 $ 918 $ 752 $ 1,200 $ 509 $ 362 $ 329 Small commercial & industrial 736 237 151 281 73 107 101 Large commercial & industrial 165 136 260 655 503 56 96 Public authorities & electric railroads 20 15 14 31 16 7 8 Other (a) 472 130 196 359 100 113 136 Total electric revenues (b) $ 3,068 $ 1,436 $ 1,373 $ 2,526 $ 1,201 $ 645 $ 670 Natural gas revenues Residential $ — $ 289 $ 378 $ 68 $ — $ 68 $ — Small commercial & industrial — 105 63 29 — 29 — Large commercial & industrial — — 100 6 — 6 — Transportation — 14 — 7 — 7 — Other (c) — 5 47 10 — 10 — Total natural gas revenues (d) $ — $ 413 $ 588 $ 120 $ — $ 120 $ — Total revenues from contracts with customers $ 3,068 $ 1,849 $ 1,961 $ 2,646 $ 1,201 $ 765 $ 670 Other revenues Revenues from alternative revenue programs $ 75 $ 6 $ (32) $ (22) $ (7) $ (3) $ (12) Other electric revenues (e) 15 7 8 2 1 1 — Other natural gas revenues (e) — 1 3 — — — — Total other revenues $ 90 $ 14 $ (21) $ (20) $ (6) $ (2) $ (12) Total revenues for reportable segments $ 3,158 $ 1,863 $ 1,940 $ 2,626 $ 1,195 $ 763 $ 658 Six Months Ended June 30, 2021 Revenues from contracts with customers ComEd PECO BGE PHI Pepco DPL ACE Electric revenues Residential $ 1,502 $ 816 $ 662 $ 1,142 $ 476 $ 337 $ 329 Small commercial & industrial 744 199 129 242 65 92 85 Large commercial & industrial 271 116 213 505 372 43 90 Public authorities & electric railroads 22 17 13 30 16 7 7 Other (a) 433 106 165 283 101 87 95 Total electric revenues (b) $ 2,972 $ 1,254 $ 1,182 $ 2,202 $ 1,030 $ 566 $ 606 Natural gas revenues Residential $ — $ 215 $ 297 $ 57 $ — $ 57 $ — Small commercial & industrial — 81 48 24 — 24 — Large commercial & industrial — — 81 3 — 3 — Transportation — 12 — 8 — 8 — Other (c) — 3 36 2 — 3 — Total natural gas revenues (d) $ — $ 311 $ 462 $ 94 $ — $ 95 $ — Total revenues from contracts with customers $ 2,972 $ 1,565 $ 1,644 $ 2,296 $ 1,030 $ 661 $ 606 Other revenues Revenues from alternative revenue programs $ 64 $ 17 $ 8 $ 88 $ 46 $ 19 $ 23 Other electric revenues (e) 16 — 3 — — — — Other natural gas revenues (e) — — 1 — — — — Total other revenues $ 80 $ 17 $ 12 $ 88 $ 46 $ 19 $ 23 Total revenues for reportable segments $ 3,052 $ 1,582 $ 1,656 $ 2,384 $ 1,076 $ 680 $ 629 __________ (a) Includes revenues from transmission revenue from PJM, wholesale electric revenue and mutual assistance revenue. (b) Includes operating revenues from affiliates in 2022 and 2021 respectively of: • $8 million, $11 million at ComEd • $2 million, $3 million at PECO • $3 million, $5 million at BGE • $6 million, $7 million at PHI • $2 million, $3 million at Pepco • $3 million, $4 million at DPL • $2 million, $1 million at ACE (c) Includes revenues from off-system natural gas sales. (d) Includes operating revenues from affiliates in 2022 and 2021 respectively of: • less than $1 million, $1 million at PECO • $7 million, $7 million at BGE (e) Includes late payment charge revenues.

Accounts Receivable (All Regist

Accounts Receivable (All Registrants)	6 Months Ended
Accounts Receivable (All Registrants)	Jun. 30, 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. Three Months Ended June 30, 2022 Exelon ComEd PECO BGE PHI Pepco DPL ACE Balance as of March 31, 2022 $ 389 $ 92 $ 125 $ 59 $ 113 $ 40 $ 24 $ 49 Plus: Current period (benefit) provision for expected credit losses (9) (5) (10) 2 4 5 — (1) Less: Write-offs, net of recoveries (a) 26 6 8 4 8 3 2 3 Balance as of June 30, 2022 $ 354 $ 81 $ 107 $ 57 $ 109 $ 42 $ 22 $ 45 Three Months Ended June 30, 2021 Exelon ComEd PECO BGE PHI Pepco DPL ACE Balance as of March 31, 2021 $ 377 $ 103 $ 130 $ 43 $ 101 $ 41 $ 25 $ 35 Plus: Current period (benefit) provision for expected credit losses (42) (9) (14) (14) (5) (1) (5) 1 Less: Write-offs, net of recoveries (a) 15 5 5 2 3 2 1 — Balance as of June 30, 2021 $ 320 $ 89 $ 111 $ 27 $ 93 $ 38 $ 19 $ 36 Six Months Ended June 30, 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 (b) 101 21 21 28 31 16 7 8 Less: Write-offs, net of recoveries (a)(c) 67 13 19 9 26 11 3 12 Balance as of June 30, 2022 $ 354 $ 81 $ 107 $ 57 $ 109 $ 42 $ 22 $ 45 Six Months Ended June 30, 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 (benefit) for expected credit losses 28 12 6 (5) 15 10 1 4 Less: Write-offs, net of recoveries (a) 42 20 11 3 8 4 4 — Balance as of June 30, 2021 $ 320 $ 89 $ 111 $ 27 $ 93 $ 38 $ 19 $ 36 __________ (a) Recoveries were not material to the Registrants. (b) For BGE, Pepco, and ACE, the increase is primarily as a result of increased receivable balances due to the increased aging of receivables. (c) For ACE, the increase in 2022 is primarily related to the termination of the moratorium, 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 throughout the year. The following tables present the rollforward of Allowance for Credit Losses on Other Accounts Receivable. Three Months Ended June 30, 2022 Exelon ComEd PECO BGE PHI Pepco DPL ACE Balance as of March 31, 2022 $ 81 $ 20 $ 9 $ 11 $ 41 $ 18 $ 9 $ 14 Plus: Current period provision (benefit) for expected credit losses 2 (2) 2 1 1 2 (1) — Less: Write-offs, net of recoveries (a) 2 — 1 1 — — — — Balance as of June 30, 2022 $ 81 $ 18 $ 10 $ 11 $ 42 $ 20 $ 8 $ 14 Three Months Ended June 30, 2021 Exelon ComEd PECO BGE PHI Pepco DPL ACE Balance as of March 31, 2021 $ 79 $ 22 $ 11 $ 9 $ 37 $ 15 $ 10 $ 12 Plus: Current period (benefit) provision for expected credit losses (5) (3) (3) — 1 1 (1) 1 Less: Write-offs, net of recoveries (a) 3 1 1 1 — — — — Balance as of June 30, 2021 $ 71 $ 18 $ 7 $ 8 $ 38 $ 16 $ 9 $ 13 Six Months Ended June 30, 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 for expected credit losses 15 2 4 4 5 4 — 1 Less: Write-offs, net of recoveries (a) 6 1 1 2 2 — — 2 Balance as of June 30, 2022 $ 81 $ 18 $ 10 $ 11 $ 42 $ 20 $ 8 $ 14 Six Months Ended June 30, 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 5 (2) 1 1 5 3 — 2 Less: Write-offs, net of recoveries (a) 5 1 2 2 — — — — Balance as of June 30, 2021 $ 71 $ 18 $ 7 $ 8 $ 38 $ 16 $ 9 $ 13 __________ (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 June 30, 2022 and December 31, 2021. Unbilled customer revenues (a) Exelon ComEd PECO BGE PHI Pepco DPL ACE June 30, 2022 $ 636 $ 191 $ 138 $ 123 $ 184 $ 94 $ 41 $ 49 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, Delaware, 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 table presents the total receivables purchased. Total receivables purchased Exelon (a) ComEd PECO BGE (a) PHI Pepco DPL ACE Six months ended June 30, 2022 $ 1,911 $ 456 $ 518 $ 391 $ 546 $ 342 $ 104 $ 100 Six months ended June 30, 2021 1,838 485 507 343 503 310 103 90 __________

Income Taxes (All Registrants)

Income Taxes (All Registrants)	6 Months Ended
Income Taxes (All Registrants)	Jun. 30, 2022
Income Tax Disclosure [Abstract]
Income Taxes (All Registrants)	Income Taxes (All Registrants) Rate Reconciliation The effective income tax rate from continuing operations varies from the U.S. federal statutory rate principally due to the following: Three Months Ended June 30, 2022 (a) Exelon ComEd PECO (b) BGE (b) PHI Pepco (b) DPL 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) (5.4) 7.9 (0.6) 2.1 1.5 (3.4) 7.2 6.7 Plant basis differences (3.3) (0.5) (11.0) (1.3) (1.7) (2.4) (0.7) (1.0) Excess deferred tax amortization (10.5) (5.5) (3.1) (19.0) (19.2) (15.7) (20.0) (24.5) Amortization of investment tax credit, including deferred taxes on basis difference (0.1) (0.1) — (0.1) (0.1) — (0.2) (0.2) Tax credits (0.4) (0.3) — (1.5) (0.4) (0.4) (0.4) (0.4) Other (d) 7.7 — — 1.4 (0.1) (0.5) 1.8 (1.6) Effective income tax rate 9.0 % 22.5 % 6.3 % 2.6 % 1.0 % (1.4) % 8.7 % — % Three Months Ended June 30, 2021 (a) Exelon ComEd PECO (e) BGE (e) PHI Pepco (e) DPL ACE (e) 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 1.1 8.0 (2.9) (12.5) 2.4 (2.1) 7.0 8.1 Plant basis differences (4.0) (0.7) (12.5) (2.3) (1.1) (1.5) (0.7) (0.6) Excess deferred tax amortization (13.4) (7.0) (3.3) (17.5) (22.3) (19.0) (21.9) (28.2) Amortization of investment tax credit, including deferred taxes on basis difference (0.1) (0.1) — (0.1) (0.1) — (0.2) (0.2) Tax credits (1.0) (0.8) — (3.6) (0.8) (0.7) (0.9) (0.6) Other (2.7) (1.1) (0.4) (6.6) (1.3) (1.9) (1.1) (2.3) Effective income tax rate 0.9 % 19.3 % 1.9 % (21.6) % (2.2) % (4.2) % 3.2 % (2.8) % __________ (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. For BGE, the lower effective tax rate is primarily due to the Maryland multi-year plan which resulted in the acceleration of certain income tax benefits. For Pepco, the income tax benefit is primarily due to the Maryland and Washington, D.C. multi-year plans which resulted in the acceleration of certain income tax benefits. For ACE, the lower effective tax rate is primarily due to the acceleration of certain income tax benefits due to distribution rate case settlements. (c) For Exelon, the lower state income taxes, net of federal income tax benefit, is primarily related to a one-time impact associated with a state tax benefit of $43 million and indemnification adjustments pursuant to the Tax Matters Agreement of $5 million as a result of the separation. (d) For Exelon, primarily related to indemnification adjustments pursuant to the Tax Matters Agreement of $48 million. (e) 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 income tax benefit is primarily due to the Maryland multi-year plan which resulted in the acceleration of certain income tax benefits. For ACE, the lower effective tax rate is primarily due to the acceleration of certain income tax benefits due to distribution rate case settlements. Six Months Ended June 30, 2022 (a) Exelon ComEd PECO (b) BGE (b) PHI Pepco (b) DPL 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) 9.9 7.9 (0.3) 2.3 2.8 (3.8) 6.5 6.7 Plant basis differences (3.5) (0.5) (11.2) (1.0) (1.7) (2.5) (0.7) (1.2) Excess deferred tax amortization (11.0) (5.8) (3.2) (17.8) (18.3) (16.3) (19.5) (22.9) Amortization of investment tax credit, including deferred taxes on basis difference (0.1) (0.1) — (0.1) (0.1) — (0.2) (0.2) Tax credits (d) 0.8 (0.3) — (0.6) (0.4) (0.4) (0.3) (0.3) Other (e) 4.7 0.1 0.3 0.3 0.1 (0.7) 0.4 (0.5) Effective income tax rate 21.8 % 22.3 % 6.6 % 4.1 % 3.4 % (2.7) % 7.2 % 2.6 % Six Months Ended June 30, 2021 (a) Exelon ComEd PECO (f) BGE (f) PHI Pepco (f) DPL 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 2.0 7.4 (2.1) (10.5) 4.2 1.5 6.6 7.8 Plant basis differences (3.6) (0.6) (11.3) (1.6) (1.3) (1.8) (0.7) (0.7) Excess deferred tax amortization (12.5) (7.0) (3.3) (15.9) (20.8) (17.2) (19.7) (28.3) Amortization of investment tax credit, including deferred taxes on basis difference (0.1) (0.1) — (0.1) (0.1) — (0.2) (0.2) Tax credits (0.5) (0.5) — (0.9) (0.5) (0.5) (0.4) (0.5) Other (1.6) (2.3) (0.1) (1.0) (0.7) (0.8) (0.1) (1.1) Effective income tax rate 4.7 % 17.9 % 4.2 % (9.0) % 1.8 % 2.2 % 6.5 % (2.0) % __________ (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. For BGE, the lower effective tax rate is primarily due to the Maryland multi-year plan which resulted in the acceleration of certain income tax benefits. For Pepco, the income tax benefit is primarily due to the Maryland and Washington, D.C. multi-year plans which resulted in the acceleration of certain income tax benefits. For ACE, the lower effective tax rate is primarily due to the acceleration of certain income tax benefits due to distribution 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 $4 million as a result of the separation. (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, primarily reflects the nondeductible transaction costs of approximately $19 million arising as part of the separation and indemnification adjustments pursuant to the Tax Matters Agreement of $48 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 income tax benefit is primarily due to the Maryland multi-year plan which resulted in the acceleration of certain income tax benefits. For ACE, the lower effective tax rate is primarily due to the acceleration of certain income tax benefits due to distribution rate case settlements. Unrecognized Tax Benefits Exelon, PHI and ACE have the following unrecognized tax benefits as of June 30, 2022 and December 31, 2021. ComEd's, PECO's, BGE's, Pepco's, and DPL's amounts are not material. Exelon (a) PHI ACE June 30, 2022 $ 147 $ 58 $ 16 December 31, 2021 143 56 16 __________ (a) As of June 30, 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. Reasonably possible the total amount of unrecognized tax benefits could significantly increase or decrease within 12 months after the reporting date As of June 30, 2022, ACE has $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. 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, 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 March 31, 2022. As of June 30, 2022, the remaining amount of the receivable is $31 million. 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 credit 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 June 30, 2022, the current and noncurrent payable amounts are $0 million and $480 million, respectively. Long-Term Marginal State Income Tax Rate (All Registrants) 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. 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 will record an estimated 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.

Retirement Benefits (All Regist

Retirement Benefits (All Registrants)	6 Months Ended
Retirement Benefits (All Registrants)	Jun. 30, 2022
Retirement Benefits [Abstract]
Retirement Benefits (All Registrants)	Retirement Benefits (All Registrants) Defined Benefit Pension and OPEB 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 Account Savings 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 are 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 June 30, 2022: Operating Company (a) Name of Plan: ComEd PECO BGE PHI Pepco DPL ACE Qualified Pension Plans: Exelon Corporation Retirement Program X X X X X X X Exelon Corporation Pension Plan for Bargaining Unit Employees X Exelon Pension Plan X X X X X X X Pepco Holdings LLC Retirement Plan X X X X X X X Non-Qualified Pension Plans: Exelon Corporation Supplemental Pension Benefit Plan and 2000 Excess Benefit Plan X X X Exelon Corporation Supplemental Management Retirement Plan X X X X X Constellation Energy Group, Inc. Senior Executive Supplemental Plan X X Constellation Energy Group, Inc. Supplemental Pension Plan X X Constellation Energy Group, Inc. Benefits Restoration Plan X X X Baltimore Gas & Electric Company Executive Benefit Plan X Baltimore Gas & Electric Company Manager Benefit Plan X X Pepco Holdings LLC 2011 Supplemental Executive Retirement Plan X X X X Conectiv Supplemental Executive Retirement Plan X X X Pepco Holdings LLC Combined Executive Retirement Plan X X Atlantic City Electric Director Retirement Plan X X Operating Company (a) Name of Plan: ComEd PECO BGE PHI Pepco DPL ACE OPEB Plans: PECO Energy Company Retiree Medical Plan X X X X X X X Exelon Corporation Health Care Program X X X X X X X Exelon Corporation Employees’ Life Insurance Plan X X X Exelon Corporation Health Reimbursement Arrangement Plan X X X BGE Retiree Medical Plan X X X X X X BGE Retiree Dental Plan X Exelon Employee Life Insurance Plan and Family Life Insurance Plan X X X X X Exelon Retiree Medical Plan of Constellation Energy Nuclear Group, LLC X X X Exelon Retiree Dental Plan of Constellation Energy Nuclear Group, LLC X X X Pepco Holdings LLC Welfare Plan for Retirees X X X X X X X __________ (a) Employees generally remain in their legacy benefit plans when transferring between operating companies. 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. 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%. 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 obligation of $24 million and an increase to the OPEB obligation 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. A portion of the net periodic benefit cost for all plans is capitalized within the Consolidated Balance Sheets. The following table presents the components of Exelon's net periodic benefit costs, prior to capitalization, for the three and six months ended June 30, 2022 and 2021. Pension Benefits OPEB Three Months Ended June 30, Three Months Ended June 30, 2022 2021 2022 2021 Components of net periodic benefit cost: Service cost $ 58 $ 75 $ 10 $ 13 Interest cost 110 101 19 17 Expected return on assets (205) (210) (25) (25) Amortization of: Prior service cost (credit) 1 — (5) (7) Actuarial loss 73 99 4 8 Net periodic benefit cost $ 37 $ 65 $ 3 $ 6 Pension Benefits OPEB Six Months Ended June 30, Six Months Ended June 30, 2022 2021 2022 2021 Components of net periodic benefit cost: Service cost $ 119 $ 148 $ 20 $ 26 Interest cost 220 202 38 35 Expected return on assets (414) (421) (50) (50) Amortization of: Prior service cost (credit) 2 1 (10) (13) Actuarial loss 149 199 8 14 Curtailment benefits — — — (1) Net periodic benefit cost $ 76 $ 129 $ 6 $ 11 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. Three Months Ended June 30, Six Months Ended June 30, Pension and OPEB Costs (Benefit) 2022 2021 2022 2021 Exelon $ 40 $ 71 $ 82 $ 140 ComEd 14 32 30 64 PECO (2) 2 (4) 4 BGE 11 16 22 31 PHI 13 12 26 24 Pepco 2 2 4 3 DPL 1 1 2 1 ACE 3 3 6 5 Defined Contribution Savings Plan 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 allow 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 three and six months ended June 30, 2022 and 2021, respectively. Three Months Ended June 30, Six Months Ended June 30, Savings Plan Matching Contributions 2022 2021 2022 2021 Exelon $ 23 $ 23 $ 43 $ 43 ComEd 10 10 18 18 PECO 3 3 6 6 BGE 3 2 5 4 PHI 4 4 7 7 Pepco 1 1 2 2 DPL 1 1 2 2 ACE 1 1 1 1

Derivative Financial Instrument

Derivative Financial Instruments (All Registrants)	6 Months Ended
Derivative Financial Instruments (All Registrants)	Jun. 30, 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 related to ongoing business operations. 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. 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. 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 meet 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. 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 of the 2021 Recast Form 10-K for additional information. (b) The fair value of the DPL economic hedge is not material as of June 30, 2022 and December 31, 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. The Mark-to-market derivative assets included in Other current assets in Exelon’s and ComEd’s Consolidated Balance Sheets were $15 million and none as of June 30, 2022 and December 31, 2021, respectively. 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 June 30, 2022, the amount of cash collateral held with external counterparties by Exelon, ComEd, BGE, PHI, Pepco, DPL, and ACE was $781 million, $133 million, $194 million, $452 million, $87 million, $224 million, and $141 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 of cash collateral received from external counterparties

Debt and Credit Agreements (All

Debt and Credit Agreements (All Registrants)	6 Months Ended
Debt and Credit Agreements (All Registrants)	Jun. 30, 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 their 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 as of June 30, 2022 and December 31, 2021. ComEd had no commercial paper borrowings as of June 30, 2022 and December 31, 2021. Outstanding Commercial Average Interest Rate on Commercial Paper Issuer June 30, 2022 December 31, 2021 June 30, 2022 December 31, 2021 Exelon (a) $ 353 $ 599 1.86 % 0.35 % PECO 210 — 1.86 % — % BGE — 130 — % 0.37 % PHI (b) 43 469 1.85 % 0.35 % Pepco 43 175 1.85 % 0.33 % DPL — 149 — % 0.36 % ACE — 145 — % 0.35 % __________ (a) Exelon Corporate had $100 million of outstanding commercial paper borrowings at June 30, 2022 and no outstanding commercial paper borrowings as of December 31, 2021. (b) 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 % See Note 15 — Debt and Credit Agreements of the 2021 Recast Form 10-K for additional information on the Registrants' credit facilities. 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 will expire on January 23, 2023. Pursuant to the loan agreement, loans made thereunder bear interest at a variable rate equal to SOFR plus 0.75% with a 22.5 basis point increase which commenced on July 24, 2022. All indebtedness pursuant to the loan agreement is unsecured. Long-Term Debt Issuance of Long-Term Debt During the six months ended June 30, 2022, the following long-term debt was issued: Company Type Interest Rate Maturity Amount Use of Proceeds Exelon SMBC Term Loan Agreement SOFR plus 0.65% July 21, 2023 $300 Fund a cash payment to Constellation and for general corporate purposes. Exelon U.S. Bank Term Loan Agreement SOFR plus 0.65% July 21, 2023 300 Fund a cash payment to Constellation and for general corporate purposes. Exelon PNC Term Loan Agreement SOFR plus 0.65% July 24, 2023 250 Fund a cash payment to Constellation and for general corporate purposes. Exelon Notes (b) 2.75% March 15, 2027 650 Repay existing indebtedness and for general corporate purposes. Exelon Notes (b) 3.35% March 15, 2032 650 Repay existing indebtedness and for general corporate purposes. Exelon Notes (b) 4.10% March 15, 2052 700 Repay existing indebtedness and for general corporate purposes. ComEd First Mortgage Bonds, Series 132 3.15% March 15, 2032 300 Repay outstanding commercial paper obligations and to fund other general corporate purposes. ComEd First Mortgage Bonds, Series 133 3.85% March 15, 2052 450 Repay outstanding commercial paper obligations and to fund other general corporate purposes. PECO First and Refunding Mortgage Bonds 4.60% May 15, 2052 350 Refinance existing indebtedness and for general corporate purposes. BGE Notes 4.55% June 1, 2052 500 Repay outstanding commercial paper obligations, repay existing indebtedness, and for general corporate purposes. Pepco (a) First Mortgage Bonds 3.97% March 24, 2052 400 Repay existing indebtedness and for general corporate purposes. DPL First Mortgage Bonds 3.06% February 15, 2052 125 Repay existing indebtedness and for general corporate purposes. ACE First Mortgage Bonds 2.27% February 15, 2032 25 Repay existing indebtedness and for general corporate purposes. ACE First Mortgage Bonds 3.06% February 15, 2052 150 Repay existing indebtedness and for general corporate purposes. __________ (a) On March 24, 2022, Pepco entered into a purchase agreement of First Mortgage Bonds of $225 million at 3.35% due on September 15, 2032. The closing date of the issuance is expected to occur in September 2022. (b) In connection with the issuance and sale of the Notes, Exelon entered into a Registration Rights Agreement with the representatives of the initial purchasers of the Notes and other parties. Pursuant to the Registration Rights Agreement, Exelon will be obligated to file a registration statement with respect to an offer to exchange the Notes for substantially similar notes of Exelon that are registered under the Securities Act or, in certain circumstances, register the resale of the Notes. The registered exchange notes, if and when issued, will have terms identical in all material respects to the Notes, except that their issuance will have been registered under the Securities Act. Long-Term Debt to Affiliates As of December 31, 2021, Exelon Corporate had $319 million recorded to intercompany notes receivable from Generation. See Note 15 — Debt and Credit Agreements of the 2021 Recast Form 10-K for additional information. 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 June 30, 2022, the Registrants are in compliance with debt covenants.

Fair Value of Financial Assets

Fair Value of Financial Assets and Liabilities (All Registrants)	6 Months Ended
	Jun. 30, 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 June 30, 2022 and December 31, 2021. The Registrants have no financial liabilities classified as Level 1. 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. June 30, 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 $ 36,294 $ 30,960 $ 2,315 $ 33,275 $ 32,902 $ 34,897 $ 2,217 $ 37,114 ComEd 10,516 9,609 — 9,609 9,773 11,305 — 11,305 PECO 4,192 3,772 50 3,822 4,197 4,740 50 4,790 BGE 4,456 4,096 — 4,096 3,961 4,406 — 4,406 PHI 8,027 4,853 2,265 7,118 7,547 5,970 2,167 8,137 Pepco 3,642 2,465 1,104 3,569 3,445 3,201 975 4,176 DPL 1,938 1,210 503 1,713 1,810 1,426 552 1,978 ACE 1,757 954 658 1,612 1,582 1,091 641 1,732 Long-Term Debt to Financing Trusts Exelon $ 390 $ — $ 398 $ 398 $ 390 $ — $ 470 $ 470 ComEd 205 — 209 209 205 — 248 248 PECO 184 — 189 189 184 — 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 15 - Debt and Credit Agreements of the 2021 Recast Form 10-K for unamortized debt issuance costs, unamortized debt discount and premium, net, and purchase accounting fair value adjustments and Note 10 - Leases of the 2021 Recast Form 10-K for finance lease liabilities. 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 June 30, 2022 and December 31, 2021: Exelon As of June 30, 2022 As of December 31, 2021 Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Assets Cash equivalents (a) $ 1,319 $ — $ — $ 1,319 $ 524 $ — $ — $ 524 Rabbi trust investments Cash equivalents 63 — — 63 60 — — 60 Mutual funds 52 — — 52 60 — — 60 Fixed income — 8 — 8 — 10 — 10 Life insurance contracts — 59 38 97 — 61 37 98 Rabbi trust investments subtotal 115 67 38 220 120 71 37 228 Mark-to-market derivative assets — — 15 15 — — — — Total assets 1,434 67 53 1,554 644 71 37 752 Liabilities Mark-to-market derivative liabilities — — (103) (103) — — (219) (219) Deferred compensation obligation — (73) — (73) — (131) — (131) Total liabilities — (73) (103) (176) — (131) (219) (350) Total net assets (liabilities) $ 1,434 $ (6) $ (50) $ 1,378 $ 644 $ (60) $ (182) $ 402 __________ (a) Exelon excludes cash of $177 million and $464 million as of June 30, 2022 and December 31, 2021, respectively, and restricted cash of $340 million and $49 million as of June 30, 2022 and December 31, 2021, respectively, and includes long-term restricted cash of $59 million and $44 million as of June 30, 2022 and December 31, 2021, respectively, which is reported in Other deferred debits in the Consolidated Balance Sheets. ComEd, PECO, and BGE ComEd PECO BGE As of June 30, 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) $ 409 $ — $ — $ 409 $ 11 $ — $ — $ 11 $ 318 $ — $ — $ 318 Rabbi trust investments Mutual funds — — — — 9 — — 9 7 — — 7 Life insurance contracts — — — — — 16 — 16 — — — — Rabbi trust investments subtotal — — — — 9 16 — 25 7 — — 7 Mark-to-market derivative assets (b) — — 15 15 — — — — — — — — Total assets 409 — 15 424 20 16 — 36 325 — — 325 Liabilities Mark-to-market derivative liabilities (b) — — (103) (103) — — — — — — — — Deferred compensation obligation — (8) — (8) — (7) — (7) — (4) — (4) Total liabilities — (8) (103) (111) — (7) — (7) — (4) — (4) Total net assets (liabilities) $ 409 $ (8) $ (88) $ 313 $ 20 $ 9 $ — $ 29 $ 325 $ (4) $ — $ 321 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 $21 million and $105 million as of June 30, 2022 and December 31, 2021, respectively, and restricted cash of $133 million and $42 million as of June 30, 2022 and December 31, 2021, respectively, and includes long-term restricted cash of $59 million and $43 million as of June 30, 2022 and December 31, 2021, respectively, which is reported in Other deferred debits in the Consolidated Balance Sheets. PECO excludes cash of $21 million and $35 million as of June 30, 2022 and December 31, 2021, respectively. BGE excludes cash of $36 million and $51 million as of June 30, 2022 and December 31, 2021, respectively, and restricted cash of $205 million and $4 million as of June 30, 2022 and December 31, 2021, respectively. (b) The Level 3 balance consists of the current asset of $15 million and current and noncurrent liability of none and $103 million, respectively, as of June 30, 2022 and none, $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 June 30, 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) $ 557 $ — $ — $ 557 $ 110 $ — $ — $ 110 Rabbi trust investments Cash equivalents 60 — — 60 59 — — 59 Mutual funds 11 — — 11 14 — — 14 Fixed income — 8 — 8 — 10 — 10 Life insurance contracts — 22 37 59 — 27 35 62 Rabbi trust investments subtotal 71 30 37 138 73 37 35 145 Total assets 628 30 37 695 183 37 35 255 Liabilities Deferred compensation obligation — (14) — (14) — (18) — (18) Total liabilities — (14) — (14) — (18) — (18) Total net assets $ 628 $ 16 $ 37 $ 681 $ 183 $ 19 $ 35 $ 237 Pepco DPL ACE As of June 30, 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) $ 115 $ — $ — $ 115 $ 223 $ — $ — $ 223 $ 218 $ — $ — $ 218 Rabbi trust investments Cash equivalents 59 — — 59 — — — — — — — — Life insurance contracts — 22 37 59 — — — — — — — — Rabbi trust investments subtotal 59 22 37 118 — — — — — — — — Total assets 174 22 37 233 223 — — 223 218 — — 218 Liabilities Deferred compensation obligation — (1) — (1) — — — — — — — — Total liabilities — (1) — (1) — — — — — — — — Total net assets $ 174 $ 21 $ 37 $ 232 $ 223 $ — $ — $ 223 $ 218 $ — $ — $ 218 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 $60 million and $100 million as of June 30, 2022 and December 31, 2021, respectively, and restricted cash of $2 million and $3 million as of June 30, 2022 and December 31, 2021, respectively. Pepco excludes cash of $14 million and $34 million as of June 30, 2022 and December 31, 2021, respectively, and restricted cash of $2 million and $3 million as of June 30, 2022 and December 31, 2021, respectively. DPL excludes cash of $26 million and $28 million as of June 30, 2022 and December 31, 2021, respectively. ACE excludes cash of $15 million and $29 million as of June 30, 2022 and December 31, 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 three and six months ended June 30, 2022 and 2021: Exelon ComEd PHI and Pepco Three Months Ended June 30, 2022 Total Mark-to-Market Life Insurance Contracts Balance as of April 1, 2022 $ (107) $ (144) $ 36 Total realized / unrealized gains Included in net income (a) 1 — 1 Included in regulatory assets/liabilities 56 56 (b) — Balance at June 30, 2022 $ (50) $ (88) (c) $ 37 The amount of total gains included in income attributed to the change in unrealized gains related to assets and liabilities as of June 30, 2022 $ 1 $ — $ 1 Exelon ComEd PHI and Pepco Three Months Ended June 30, 2021 Total Mark-to-Market Life Insurance Contracts Balance as of April 1, 2021 $ (260) $ (295) $ 35 Total realized / unrealized gains Included in net income (a) 1 — 1 Included in regulatory assets 30 30 (b) — Purchases, sales, and settlements Settlements (2) — (2) Balance as of June 30, 2021 $ (231) $ (265) $ 34 The amount of total gains included in income attributed to the change in unrealized gains related to assets and liabilities as of June 30, 2021 $ 1 $ — $ 1 Exelon ComEd PHI and Pepco Six months ended June 30, 2022 Total Mark-to-Market Life Insurance Contracts Balance as of January 1, 2022 $ (182) $ (219) $ 35 Total realized / unrealized gains Included in net income (a) 2 — 2 Included in regulatory assets/liabilities 131 131 (b) — Transfers out of Level 3 (1) — — Balance as of June 30, 2022 $ (50) $ (88) (c) $ 37 The amount of total gains included in income attributed to the change in unrealized gains related to assets and liabilities as of June 30, 2022 $ 2 $ — $ 2 Exelon ComEd PHI and Pepco Six Months Ended June 30, 2021 Total Mark-to-Market Life Insurance Contracts Balance as of January 1, 2021 $ (267) $ (301) $ 34 Total realized / unrealized gains Included in net income (a) 2 — 2 Included in regulatory assets 36 36 (b) — Purchases, sales, and settlements Settlements (2) — (2) Balance as of June 30, 2021 $ (231) $ (265) $ 34 The amount of total gains included in income attributed to the change in unrealized gain related to assets and liabilities as of June 30, 2021 $ 2 $ — $ 2 __________ (a) Classified in Operating and maintenance expense in the Consolidated Statements of Operations and Comprehensive Income. (b) Includes $59 million of increases in fair value and a decrease for realized gains due to settlements of $3 million recorded in purchased power expense associated with floating-to-fixed energy swap contracts with unaffiliated suppliers for the three months ended June 30, 2022. Includes $25 million of increases in fair value and an increase for realized losses due to settlements of $5 million recorded in purchased power expense associated with floating-to-fixed energy swap contracts with unaffiliated suppliers for the three months ended June 30, 2021. Includes $128 million of increases in fair value and an increase for realized losses due to settlements of $3 million recorded in purchase power expense associated with floating-to-fixed energy swap contracts with unaffiliated suppliers for the six months ended June 30, 2022. Includes $23 million of increases in fair value and an increase for realized losses due to settlements of $13 million recorded in purchased power expense associated with floating-to-fixed energy swap contracts with unaffiliated suppliers for the six months ended June 30, 2021. (c) The balance consists of $15 million of current assets and current and noncurrent liability of none and $103 million, respectively, as of June 30, 2022. Valuation Techniques Used to Determine Fair Value Exelon’s valuation techniques used to measure the fair value of the assets and liabilities shown in the tables below are in accordance with the policies discussed in Note 16 — Fair Value of Financial Assets and Liabilities of the 2021 Recast Form 10-K. Mark-to-Market Derivatives (Exelon and ComEd) The table below discloses the significant unobservable inputs to the forward curve used to value mark-to-market derivatives. Type of trade Fair Value as of June 30, 2022 Fair Value as of December 31, 2021 Valuation Unobservable 2022 Range & Arithmetic Average 2021 Range & Arithmetic Average Mark-to-market derivatives $ (88) $ (219) Discounted Forward power price (a) $30.54 - $89.78 $46.33 $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)	6 Months Ended
Commitments and Contingencies (All Registrants)	Jun. 30, 2022
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies (All Registrants)	Commitments and Contingencies (All Registrants) The following is an update to the current status of commitments and contingencies set forth in Note 17 — Commitments and Contingencies of the 2021 Recast Form 10-K. 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 June 30, 2022: Description Exelon PHI Pepco DPL ACE Total commitments $ 513 $ 320 $ 120 $ 89 $ 111 Remaining commitments (a) 61 53 44 6 3 __________ (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 conducted two of the three 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 RFP for the third and final 40 MW wind REC tranche is under way and bids will be evaluated in the third quarter of 2022, with a potential award in the fourth quarter of 2022. Commercial Commitments (All Registrants). The Registrants’ commercial commitments as of June 30, 2022, representing commitments potentially triggered by future events were as follows: Expiration within Total 2022 2023 2024 2025 2026 2027 and beyond Exelon Letters of credit $ 17 $ 8 $ 9 $ — $ — $ — $ — Surety bonds (a) 185 144 39 2 — — — Financing trust guarantees 378 — — — — — 378 Guaranteed lease residual values (b) 30 — 2 6 6 5 11 Total commercial commitments $ 610 $ 152 $ 50 $ 8 $ 6 $ 5 $ 389 ComEd Letters of credit $ 10 $ 4 $ 6 $ — $ — $ — $ — Surety bonds (a) 16 9 5 2 — — — Financing trust guarantees 200 — — — — — 200 Total commercial commitments $ 226 $ 13 $ 11 $ 2 $ — $ — $ 200 PECO Letters of credit $ 1 $ — $ 1 $ — $ — $ — $ — Surety bonds (a) 3 1 2 — — — — Financing trust guarantees 178 — — — — — 178 Total commercial commitments $ 182 $ 1 $ 3 $ — $ — $ — $ 178 BGE Letters of credit $ 2 $ 2 $ — $ — $ — $ — $ — Surety bonds (a) 2 1 1 — — — — Total commercial commitments $ 4 $ 3 $ 1 $ — $ — $ — $ — PHI Surety bonds (a) $ 95 $ 76 $ 19 $ — $ — $ — $ — Guaranteed lease residual values (b) 30 — 2 6 6 5 11 Total commercial commitments $ 125 $ 76 $ 21 $ 6 $ 6 $ 5 $ 11 Pepco Surety bonds (a) $ 84 $ 71 $ 13 $ — $ — $ — $ — Guaranteed lease residual values (b) 10 — 1 2 2 2 3 Total commercial commitments $ 94 $ 71 $ 14 $ 2 $ 2 $ 2 $ 3 DPL Surety bonds (a) $ 7 $ 3 $ 4 $ — $ — $ — $ — Guaranteed lease residual values (b) 13 — — 3 3 2 5 Total commercial commitments $ 20 $ 3 $ 4 $ 3 $ 3 $ 2 $ 5 ACE Surety bonds (a) $ 4 $ 2 $ 2 $ — $ — $ — $ — Guaranteed lease residual values (b) 7 — 1 1 1 1 3 Total commercial commitments $ 11 $ 2 $ 3 $ 1 $ 1 $ 1 $ 3 __________ (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 $74 million guaranteed by Exelon and PHI, of which $24 million, $31 million, and $19 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 almost all of these sites, there are additional PRPs that may share responsibility for the ultimate remediation of each location. • ComEd has 21 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 2023. • 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 2023. • 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. As of June 30, 2022 and December 31, 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: June 30, 2022 December 31, 2021 Total environmental Portion of total related to Total environmental Portion of total related to Exelon $ 347 $ 299 $ 352 $ 303 ComEd 274 273 279 279 PECO 21 20 22 20 BGE 7 6 6 4 PHI 42 — 42 — Pepco 40 — 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 developing a FS to evaluate possible remedial alternatives for submission to DOEE. The Court has established a schedule for completion of the FS, and approval by the DOEE, by September 16, 2022. After completion and approval of the FS, 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. 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 National Park Service (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 (District) on behalf of DOEE conveying a settlement offer to resolve all PRPs' liability to the District. Pepco responded on July 27, 2022 to enter into settlement discussions. 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. Litigation and Regulatory Matters Deferred Prosecution Agreement (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 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 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. Plaintiffs' opening appeal brief in the Seventh Circuit was filed on January 14, 2022. Exelon and ComEd filed their response brief on March 7, 2022, and plaintiffs filed their reply brief on April 6, 2022. Oral argument was held on May 17, 2022. • 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 briefs are currently due August 5, 2022. • 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. On February 10, 2022, the court granted an extension of the amendment to the protective order, at the U.S. government's request. The court granted a further extension of the amendment to the protective order and narrowed its scope, at the U.S. government's request, on May 14, 2022. On July 14, 2022, the court further extended the protective order amendment to September 30, 2022 and reset the next court status for August 15, 2022. • 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. On February 3, 2022, the court granted an extension of the stay for another 120 days and directed the parties to file a status report on June 1, 2022. On June 1, 2022, the parties requested a further extension of the stay until September 14, 2022, which the court granted. • 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 reflec ted 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. The ICC continues to conduct an investigation into rate impacts of conduct admitted in the DPA initiated on August 12, 2021. On December 16, 2021, ComEd filed direct testimony addressing the costs recovered from customers related to the DPA and Exelon's funding of the fine paid by ComEd. In that testimony, ComEd proposed to voluntarily refund to customers compensation costs of the former officers charged with wrongdoing in connection with events described in the DPA for the period during which those events occurred as well as costs, previously proposed to be returned, of individuals and entities specifically identified in the DPA, as well as individuals and entities who were referred to ComEd as part of the conduct described in the DPA and who failed, during their tenure at ComEd, to perform work to management expectations. The testimony supports the calculation of the refund amount and proposes a refund mechanism (one-time bill credit in April 2023) and also addresses other topics outlined by statute and the ICC orders initiating the investigation. On April 14, 2022, in response to rebuttal testimony from ICC staff and the Illinois Attorney General, City of Chicago, and CUB, ComEd filed surrebuttal testimony, in which ComEd proposed to increase its voluntary customer refund to $38 million, including ICC and FERC jurisdictional amounts and estimated interest, to resolve the issue of the potential expenditure of customer monies on activities identified in the DPA in this matter. An accrual for the amount of the voluntary customer refund has been recorded in Other current liabilities and Other deferred credits and other liabilities in Exelon’s and ComEd’s Consolidated Balance Sheets as of June 30, 2022. The voluntary 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. The evidentiary hearing on the remaining contested issue was held on April 28, 2022. On June 13, 2022, the ICC Administrate Law Judge issued a proposed order, which accepts ComEd's voluntary customer refund of $38 million and rejects alternative proposals for other larger adjustments to rates. A final order is expected by September 9, 2022. 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 Committee, the Corporate Investment Committee, individual defendants, and other unnamed fiduciaries of the Exelon Corporation Employee Savings Plan (Plan). The complaint alleges that the defendants violated their fiduciary duties under the Plan by including certain investment options that allegedly were more expensive than and underperformed similar passively-managed or other funds available in the marketplace and permitting a third-party administrative service provider/recordkeeper and an investment adviser to charge excessive fees for the services provided. The plaintiffs seek declaratory, equitable and monetary relief on behalf of the Plan and participants. On February 16, 2022, the court granted the parties' stipulated dismissal of the individual named defendants without prejudice. The remaining defendants filed a motion to dismiss the complaint on February 25, 2022. The plaintiffs filed their response brief on March 28, 2022 and the defendants filed their reply on April 11, 2022. On March 4, 2022, the Chamber of Commerce filed a brief of amicus curiae in support of the defendants' motion to dismiss. No loss contingencies have been reflected in Exelon’s consolidated financial statements with respect to this matter, as such contingencies are neither probable nor reasonably estimable at this time. General (All Registrants). The Registrants are involved in various other litigation matters that are being defended and handled in the ordinary course of business. The assessment of whether a loss is probable or reasonably possible, and whether the loss or a range of loss is estimable, often involves a series of complex judgments about future events. The Registrants maintain accruals for such losses that are probable of being incurred and subject to reasonable estimation. Management is sometimes unable to estimate an amount or range of reasonably possible loss, particularly where (1) the damages sought are indeterminate, (2) the proceedings are in the early stages, or (3) the matters involve novel or unsettled legal theories. In such cases, there is considerable uncertainty regarding the timing or ultimate resolution of such matters, including a possible eventual loss.

Changes in Accumulated Other Co

Changes in Accumulated Other Comprehensive Income (Exelon)	6 Months Ended
Changes in Accumulated Other Comprehensive Income (Exelon)	Jun. 30, 2022
Changes in Accumulated Other Comprehensive Income [Abstract]
Changes in Accumulated Other Comprehensive Income	Changes in Accumulated Other Comprehensive Income (Exelon) The following tables present changes in Exelon's AOCI, net of tax, by component: Three Months Ended June 30, 2022 Cash Flow Hedges Pension and Non-Pension Postretirement Benefit Plan Items (a) Foreign Total Balance at March 31, 2022 $ — $ (713) $ — $ (713) OCI before reclassifications — 2 — 2 Amounts reclassified from AOCI — 10 — 10 Net current-period OCI — 12 — 12 Balance at June 30, 2022 $ — $ (701) $ — $ (701) Three Months Ended June 30, 2021 Cash Flow Hedges Pension and Non-Pension Postretirement Benefit Plan Items (a) Foreign Total Balance at March 31, 2021 $ (5) $ (3,319) $ (22) $ (3,346) OCI before reclassifications — — 2 2 Amounts reclassified from AOCI — 55 — 55 Net current-period OCI — 55 2 57 Balance at June 30, 2021 $ (5) $ (3,264) $ (20) $ (3,289) Six Months Ended June 30, 2022 Cash Flow Hedges Pension and Non-Pension Postretirement Benefit Plan Items (a) Foreign Total Balance at December 31, 2021 $ (6) $ (2,721) $ (23) $ (2,750) Separation of Constellation 6 1,994 23 2,023 OCI before reclassifications — 2 — 2 Amounts reclassified from AOCI — 24 — 24 Net current-period OCI — 26 — 26 Balance at June 30, 2022 $ — $ (701) $ — $ (701) Six Months Ended June 30, 2021 Cash Flow Hedges Pension and Non-Pension Postretirement Benefit Plan Items (a) Foreign Total Balance at December 31, 2020 $ (5) $ (3,372) $ (23) $ (3,400) OCI before reclassifications — (2) 3 1 Amounts reclassified from AOCI — 110 — 110 Net current-period OCI — 108 3 111 Balance at June 30, 2021 $ (5) $ (3,264) $ (20) $ (3,289) __________ (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 8 — 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): Three Months Ended June 30, Six Months Ended June 30, 2022 2021 2022 2021 Pension and non-pension postretirement benefit plans: Prior service benefit reclassified to periodic benefit cost $ — $ 1 $ — $ 2 Actuarial loss reclassified to periodic benefit cost (3) (19) (8) (38) Pension and non-pension postretirement benefit plans valuation adjustment (1) (1) — (1)

Supplemental Financial Informat

Supplemental Financial Information (All Registrants)	6 Months Ended
Supplemental Financial Information (All Registrants)	Jun. 30, 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 Three Months Ended June 30, 2022 Utility taxes (a) $ 203 $ 71 $ 39 $ 20 $ 73 $ 67 $ 5 $ 1 Property 94 10 4 46 33 23 10 — Payroll 28 7 5 4 7 1 1 1 Three Months Ended June 30, 2021 Utility taxes (a) $ 184 $ 61 $ 32 $ 20 $ 71 $ 65 $ 5 $ — Property 86 8 4 43 31 20 10 1 Payroll 32 6 4 5 7 1 1 1 Six Months Ended June 30, 2022 Utility taxes (a) $ 424 $ 149 $ 77 $ 47 $ 151 $ 137 $ 12 $ 2 Property 188 20 9 92 67 46 20 1 Payroll 64 13 8 9 14 3 2 2 Six Months Ended June 30, 2021 Utility taxes (a) $ 377 $ 121 $ 66 $ 45 $ 145 $ 132 $ 11 $ 1 Property 173 16 9 85 63 42 19 1 Payroll 64 13 8 9 14 3 3 2 _________ (a) The Registrants' utility taxes represent 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 Three Months Ended June 30, 2022 AFUDC — Equity $ 38 $ 9 $ 8 $ 6 $ 15 $ 11 $ 2 $ 2 Non-service net periodic benefit cost 16 — — — — — — — Three Months Ended June 30, 2021 AFUDC — Equity $ 34 $ 9 $ 6 $ 7 $ 12 $ 10 $ 1 $ 1 Non-service net periodic benefit cost 26 — — — — — — — Six Months Ended June 30, 2022 AFUDC — Equity $ 74 $ 17 $ 15 $ 12 $ 30 $ 22 $ 4 $ 4 Non-service net periodic benefit cost 33 — — — — — — — Six Months Ended June 30, 2021 AFUDC — Equity $ 64 $ 13 $ 12 $ 14 $ 25 $ 20 $ 3 $ 2 Non-service net periodic benefit cost 46 — — — — — — — Supplemental Cash Flow Information The following tables provide additional information about material items recorded in the Registrants' Consolidated Statements of Cash Flows. Depreciation and amortization Exelon (a) ComEd PECO BGE PHI Pepco DPL ACE Six Months Ended June 30, 2022 Property, plant, and equipment (b) $ 1,376 $ 511 $ 177 $ 235 $ 335 $ 145 $ 92 $ 83 Amortization of regulatory assets (b) 357 138 8 87 124 68 21 35 Amortization of intangible assets, net (b) 8 — — — — — — — Amortization of energy contract assets and liabilities (c) 3 — — — — — — — Nuclear fuel (d) 66 — — — — — — — ARO accretion (e) 44 — — — — — — — Total depreciation, amortization, and accretion $ 1,854 $ 649 $ 185 $ 322 $ 459 $ 213 $ 113 $ 118 Six Months Ended June 30, 2021 Property, plant, and equipment (b) $ 3,043 $ 480 $ 165 $ 215 $ 309 $ 135 $ 84 $ 76 Amortization of regulatory assets (b) 291 109 8 78 95 64 20 11 Amortization of intangible assets, net (b) 29 — — — — — — — Amortization of energy contract assets and liabilities (c) 13 — — — — — — — Nuclear fuel (d) 549 — — — — — — — ARO accretion (e) 255 — — — — — — — Total depreciation, amortization, and accretion $ 4,180 $ 589 $ 173 $ 293 $ 404 $ 199 $ 104 $ 87 __________ (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 Operating revenues or Purchased power and fuel expense in Exelon’s Consolidated Statements of Operations and Comprehensive Income. (d) Included in Purchased fuel expense in Exelon's Consolidated Statement of Operations and Comprehensive Income. (e) Included in Operating and maintenance expense in Exelon's Consolidated Statement of Operations and Comprehensive Income. Other non-cash operating activities Exelon (a) ComEd PECO BGE PHI Pepco DPL ACE Six Months Ended June 30, 2022 Pension and non-pension postretirement benefit costs $ 86 $ 30 $ (4) $ 22 $ 26 $ 4 $ 2 $ 6 Allowance for credit losses 96 29 21 18 29 16 6 7 Other decommissioning-related activity 36 — — — — — — — Energy-related options 60 — — — — — — — True-up adjustments to decoupling mechanisms and formula rates (b) (27) (75) (6) 32 22 7 3 12 Long-term incentive plan 40 — — — — — — — Amortization of operating ROU asset 38 1 — 14 14 4 4 2 AFUDC — Equity (74) (17) (15) (12) (30) (22) (4) (4) Six Months Ended June 30, 2021 Pension and non-pension postretirement benefit costs $ 196 $ 64 $ 4 $ 29 $ 24 $ 3 $ 1 $ 5 Allowance for credit losses 100 24 17 4 9 5 2 2 Other decommissioning-related activity (636) — — — — — — — Energy-related options 20 — — — — — — — True-up adjustments to decoupling mechanisms and formula rates (b) (176) (64) (17) (8) (88) (46) (19) (23) Long-term incentive plan 62 — — — — — — — Amortization of operating ROU asset 83 1 — 15 14 3 5 2 AFUDC — Equity (64) (13) (12) (14) (25) (20) (3) (2) __________ (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 BGE, Pepco, DPL, and ACE, reflects the change in regulatory assets and liabilities associated with their decoupling mechanisms and transmission formula rates. For PECO, reflects the change in regulatory assets and liabilities associated with its transmission formula rates. See Note 3 — Regulatory Matters of the 2021 Recast Form 10-K for additional information. The following tables provide a reconciliation of cash, cash equivalents, and restricted cash 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 June 30, 2022 Cash and cash equivalents $ 816 $ 120 $ 23 $ 354 $ 278 $ 14 $ 26 $ 233 Restricted cash and cash equivalents 961 384 9 205 341 117 223 — Restricted cash included in other long-term assets 59 59 — — — — — — Total cash, restricted cash, and cash equivalents $ 1,836 $ 563 $ 32 $ 559 $ 619 $ 131 $ 249 $ 233 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 from discontinued operations 582 — — — — — — — Total cash, restricted cash, and cash equivalents $ 1,619 $ 384 $ 44 $ 55 $ 213 $ 68 $ 71 $ 29 June 30, 2021 Cash and cash equivalents $ 1,578 $ 71 $ 376 $ 368 $ 61 $ 17 $ 17 $ 11 Restricted cash and cash equivalents 379 240 8 3 42 33 5 3 Restricted cash included in other long-term assets 52 43 — — 9 — — 9 Total cash, restricted cash, and cash equivalents (a) $ 2,009 $ 354 $ 384 $ 371 $ 112 $ 50 $ 22 $ 23 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 from discontinued operations 332 — — — — — — — Total cash, restricted cash, and cash equivalents $ 1,166 $ 405 $ 26 $ 145 $ 160 $ 65 $ 15 $ 30 __________ (a) Exelon's amounts include amounts related to Generation prior to the separation. See Note 2 — Discontinued Operations for additional information. For additional information on restricted cash see Note 1 — Significant Accounting Policies of the 2021 Recast Form 10-K. Supplemental Balance Sheet Information The following table provides additional information about material items recorded in the Registrants' Consolidated Balance Sheets. Accrued expenses Exelon ComEd PECO BGE PHI Pepco DPL ACE June 30, 2022 Compensation-related accruals (a) $ 428 $ 109 $ 57 $ 54 $ 82 $ 26 $ 16 $ 13 Taxes accrued 243 94 60 31 84 57 12 11 Interest accrued 331 124 40 44 59 31 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)	6 Months Ended
Related Party Transactions (All Registrants)	Jun. 30, 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 : Three Months Ended June 30, Six Months Ended June 30, 2022 2021 2022 2021 ComEd (a) $ — $ 78 $ 59 $ 163 PECO (b) — 41 33 83 BGE (c) — 58 18 130 PHI — 77 51 176 Pepco (d) — 55 39 130 DPL (e) — 17 10 37 ACE (f) — 5 2 9 __________ (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 Three Months Ended June 30, Six Months Ended June 30, Three Months Ended June 30, Six Months Ended June 30, 2022 2021 2022 2021 2022 2021 2022 2021 Exelon BSC $ 139 $ 114 $ 344 $ 249 PHISCO 21 17 40 36 ComEd BSC $ 80 $ 72 $ 165 $ 143 67 45 152 102 PECO BSC 47 40 96 80 20 17 56 44 BGE BSC 51 45 102 88 22 20 60 43 PHI BSC 46 37 96 76 30 32 76 60 PHISCO — — — — 21 17 40 36 Pepco BSC 27 23 56 45 11 13 28 25 PHISCO 29 28 58 57 8 7 16 15 DPL BSC 17 15 35 29 9 10 23 19 PHISCO 25 24 49 49 7 5 13 11 ACE BSC 14 12 29 24 10 8 25 15 PHISCO 22 21 43 43 6 5 11 10 Current Receivables from/Payables to affiliates The following tables present current receivables from affiliates and current payables to affiliates: June 30, 2022 Receivables from affiliates: Payables to affiliates: ComEd PECO BGE Pepco DPL ACE BSC PHISCO Other Total ComEd $ — $ — $ — $ — $ — $ 57 $ — $ 8 $ 65 PECO $ — — — — — 25 — 4 29 BGE — — — — — 28 — 2 30 PHI — — — — — — 5 — 10 15 Pepco — — — — 1 14 13 1 29 DPL — — — 9 — 9 10 1 29 ACE — — — — — 9 10 1 20 Other 3 — — — — — — — 3 Total $ 3 $ — $ — $ 9 $ — $ 1 $ 147 $ 33 $ 27 $ 220 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. ComEd, 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 Generation as a result of the nuclear decommissioning contractual construct whereby, to the extent NDT funds are greater than the underlying ARO at the end of decommissioning, 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 June 30, 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 of the 2021 Recast Form 10-K for additional information. Long-term debt to financing trusts The following table presents Long-term debt to financing trusts: June 30, 2022 December 31, 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_2

Significant Accounting Policies (Policies)	6 Months Ended
Significant Accounting Policies (Policies)	Jun. 30, 2022
Accounting Policies [Abstract]
Description of Business and Basis of Presentation (All Registrants)	Description of Business 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 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 & 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 This is a combined quarterly 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, accounting, 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” in the consolidated financial statements and include intercompany eliminations unless otherwise disclosed. The accompanying consolidated financial statements as of June 30, 2022 and for the three and six months ended June 30, 2022 and 2021 are unaudited but, in the opinion of the management of each Registrant include all adjustments that are considered necessary for a fair statement of the Registrants’ respective financial statements in accordance with GAAP. All adjustments are of a normal, recurring nature, except as otherwise disclosed. The December 31, 2021 Consolidated Balance Sheets were derived from audited financial statements. The interim financial statements are to be read in conjunction with prior annual financial statements and notes. Additionally, financial results for interim periods are not necessarily indicative of results that may be expected for any other interim period or for the fiscal year ending December 31, 2022. These Combined Notes to Consolidated Financial Statements have been prepared pursuant to the rules and regulations of the SEC for Quarterly Reports on Form 10-Q. Certain information and note disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations. 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, shareholders' equity, and cash flows related to Constellation 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.

Discontinued Operations (Tables

Discontinued Operations (Tables) - Exelon Generation Co L L C [Member]	6 Months Ended	12 Months Ended
	Jun. 30, 2022	Dec. 31, 2021
Discontinued Operations - Income Statement
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 three and six months ended June 30, 2022 and June 30, 2021. 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 are 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. Three Months Ended Six Months Ended 2021 2022 2021 Operating revenues Competitive business revenues $ 3,900 $ 1,855 $ 9,165 Competitive business revenues from affiliates 255 161 549 Total operating revenues 4,155 2,016 9,714 Operating expenses Competitive businesses purchased power and fuel 1,947 1,138 6,557 Operating and maintenance (a) 1,382 371 2,287 Depreciation and amortization 930 94 1,869 Taxes other than income taxes 118 44 239 Total operating expenses 4,377 1,647 10,952 Gain on sales of assets and businesses 8 10 79 Operating income (loss) (214) 379 (1,159) Other income and (deductions) Interest expense, net (72) (20) (140) Other, net 508 (281) 675 Total other income and (deductions) 436 (301) 535 Income (loss) before income taxes 222 78 (624) Income taxes 71 (40) 13 Equity in losses of unconsolidated affiliates (1) (1) (3) Net income (loss) 150 117 (640) Net income attributable to noncontrolling interests 75 1 99 Net income (loss) from discontinued operations $ 75 $ 116 $ (739) __________ (a) Includes transaction and transition costs related to the separation of $52 million for the six months ended June 30, 2022 and $4 million and $7 million for the three and six months ended June 30, 2021, respectively. See discussion above for additional information.
Discontinued Operations - Balance Sheet [Table Text Block]		The following table presents the assets and liabilities of discontinued operations in Exelon’s Consolidated Balance Sheet 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 [Table Text Block]	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 six months ended June 30, 2022 and June 30, 2021. Six Months Ended 2022 2021 Non-cash items included in net income (loss) from discontinued operations: Depreciation, amortization, and accretion, including nuclear fuel and energy contract amortization $ 207 $ 2,686 Asset impairments — 493 Gain on sales of assets and businesses 9 (79) Deferred income taxes and amortization of investment tax credits (143) (268) Net fair value changes related to derivatives (59) (490) Net realized and unrealized losses (gains) on NDT fund investments 205 (376) Net unrealized losses (gains) on equity investments 16 (96) Other decommissioning-related activity 36 (636) Cash flows from investing activities: Capital expenditures (227) (731) Collection of DPP 169 2,209 Supplemental cash flow information: Decrease in capital expenditures not paid (128) (66) Increase in DPP 348 1,958 Increase in PP&E related to ARO update 335 —

Regulatory Matters (Tables)

Regulatory Matters (Tables)	6 Months Ended
Regulatory Matters (Tables)	Jun. 30, 2022
Regulated Operations [Abstract]
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 PECO - Pennsylvania March 30, 2021 Electric 246 132 N/A (b) November 18, 2021 January 1, 2022 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 (f) September 1, 2021 (amended December 23, 2021) Electric 27 13 9.60 % March 2, 2022 March 2, 2022 ACE - New Jersey (g) December 9, 2020 (amended February 26, 2021) Electric 67 41 9.60 % July 14, 2021 January 1, 2022 __________ (a) 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. (b) The PECO electric base rate case proceeding was resolved through a settlement agreement, which did not specify an approved ROE. (c) Reflects a three-year cumulative multi-year plan for 2021 through 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. BGE proposed to use certain tax benefits to fully offset the increases in 2021 and 2022 and partially offset the increase in 2023. 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 increases. Whether certain tax benefits will be used to offset the customer rate increases in 2023 has not been decided, and BGE cannot predict the outcome. (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 for the 12-month period ending March 31, 2023. Whether certain tax benefits will be used to offset the customer rate increases for the 12-month period ending 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) 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) April 15, 2022 Electric $ 199 7.85 % Fourth quarter of 2022 PECO - Pennsylvania March 31, 2022 Natural Gas 82 10.95 % Fourth quarter of 2022 DPL - Delaware (b) January 14, 2022 (amended February 28, 2022) Natural Gas 15 10.30 % First quarter of 2023 DPL - Maryland (c) May 19, 2022 Electric 38 10.25 % Fourth quarter of 2022 __________ (a) ComEd's 2023 requested revenue requirement 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 average monthly 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 average monthly yields for 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 as a result of the law authorizing the rate setting process sunsetting at the end of 2022. See Note 3 - Regulatory Matters of the 2021 Recast Form 10-K for additional information on ComEd's transition away from the electric distribution formula rate. (b) The rates will go into effect on August 14, 2022, 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 update: 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.
Public Utilities Energy Efficiency Revenue [Table Text Block]	ComEd filed its annual energy efficiency formula rate update with the ICC on May 25, 2022. The filing establishes the revenue requirement used to set the rates that will take effect in January 2023 after the ICC's review and approval. The requested revenue requirement update is based on a reconciliation of the 2021 actual costs plus projected 2023 expenditures. Initial Revenue Requirement Increase Annual Reconciliation Decrease Total Revenue Requirement Increase Requested Return on Rate Base (a) Requested ROE $ 66 $ (16) $ 50 5.94 % 7.85 % __________
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 June 30, 2022 $ 49 $ 4 $ — $ 32 $ 13 $ 11 $ 2 $ — December 31, 2021 43 1 — 37 5 3 2 — __________ (a) Reflects ComEd's unrecognized equity returns earned for ratemaking purposes on its energy efficiency and electric distribution formula rate regulatory assets. (b) BGE's authorized amounts capitalized for ratemaking purposes primarily relate to earnings on shareholder's investment on its AMI programs. (c) Pepco's and DPL's authorized amounts capitalized for ratemaking purposes relate to earnings on shareholder's investment on their respective AMI Programs and Energy Efficiency and Demand Response Programs, and for Pepco District of Columbia revenue decoupling program. The earnings on energy efficiency are on Pepco District of Columbia and DPL Delaware programs only.

Revenue from Contracts with C_2

Revenue from Contracts with Customers (Tables)	6 Months Ended
Revenue from Contracts with Customers (Tables)	Jun. 30, 2022
Contract with Customers [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction	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 June 30, 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. 2022 2023 2024 2025 2026 and thereafter Total Exelon $ 4 $ 8 $ 6 $ 5 $ 82 $ 105 PHI 4 8 6 5 82 105 Pepco 3 6 5 5 65 84 DPL 1 1 — — 9 11 ACE — 1 1 — 8 10
Contract Liabilities
Contract with Customers [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 for the three and six months ended June 30, 2022 and 2021. As of June 30, 2022 and December 31, 2021, ComEd's, PECO's, and BGE's contract liabilities were immaterial. Exelon (a) PHI (a) Pepco (a) DPL ACE (a) Balance as of December 31, 2021 $ 109 $ 109 $ 87 $ 11 $ 11 Revenues recognized (2) (2) (2) — — Balance as of March 31, 2022 107 107 85 11 11 Revenues recognized (2) (2) (1) — (1) Balance as of June 30, 2022 $ 105 $ 105 $ 84 $ 11 $ 10 Exelon (a) PHI (a) Pepco (a) DPL (a) ACE (a) Balance as of December 31, 2020 $ 118 $ 118 $ 94 $ 12 $ 12 Revenues recognized (2) (2) (2) — — Balance as of March 31, 2021 116 116 92 12 12 Revenues recognized (3) (3) (1) (1) (1) Balance as of June 30, 2021 $ 113 $ 113 $ 91 $ 11 $ 11 __________ (a) Revenues recognized in the three and six months ended June 30, 2022 and 2021, were included in the contract liabilities at December 31, 2021 and 2020, respectively.

Segment Information (Tables)

Segment Information (Tables)	6 Months Ended
Segment Information (Tables)	Jun. 30, 2022
Segment Tables [Line Items]
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 three and six months ended June 30, 2022 and 2021 is as follows: Three Months Ended June 30, 2022 and 2021 ComEd PECO BGE PHI Other (a) Intersegment Exelon Operating revenues (b) : 2022 Electric revenues $ 1,425 $ 708 $ 629 $ 1,182 $ — $ (6) $ 3,938 Natural gas revenues — 108 157 37 — (1) 301 Shared service and other revenues — — — 2 384 (386) — Total operating revenues $ 1,425 $ 816 $ 786 $ 1,221 $ 384 $ (393) $ 4,239 2021 Electric revenues $ 1,517 $ 610 $ 558 $ 1,113 $ — $ (9) $ 3,789 Natural gas revenues — 83 124 24 — — 231 Shared service and other revenues — — — 3 524 (527) — Total operating revenues $ 1,517 $ 693 $ 682 $ 1,140 $ 524 $ (536) $ 4,020 Intersegment revenues (c) : 2022 $ 3 $ 1 $ 3 $ 2 $ 384 $ (393) $ — 2021 5 2 7 4 522 (535) 5 Depreciation and amortization: 2022 $ 328 $ 93 $ 152 $ 240 $ 16 $ 1 $ 830 2021 296 87 141 194 18 — 736 Operating expenses: 2022 $ 1,039 $ 639 $ 717 $ 1,066 $ 460 $ (378) $ 3,543 2021 1,196 552 620 955 495 (374) 3,444 Interest expense, net: 2022 $ 104 $ 43 $ 36 $ 73 $ 101 $ 1 $ 358 2021 98 42 34 67 83 — 324 Income (loss) from continuing operations before income taxes: 2022 $ 293 $ 142 $ 38 $ 101 $ (62) $ (1) $ 511 2021 238 106 37 138 (46) (144) 329 Income Taxes: 2022 $ 66 $ 9 $ 1 $ 1 $ (31) $ — $ 46 2021 46 2 (8) (3) (27) (7) 3 Net income (loss) from continuing operations: 2022 $ 227 $ 133 $ 37 $ 100 $ (31) $ (1) $ 465 2021 192 104 45 141 (19) (137) 326 Capital Expenditures: 2022 $ 591 $ 314 $ 275 $ 367 $ 38 $ — $ 1,585 2021 549 282 284 433 15 — 1,563 __________ (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 14 — Supplemental Financial Information for additional information on total utility taxes. (c) See Note 15 — Related Party Transactions for additional information on intersegment revenues. PHI: Pepco DPL ACE Other (a) Intersegment PHI Operating revenues (b) : 2022 Electric revenues $ 581 $ 295 $ 309 $ — $ (3) $ 1,182 Natural gas revenues — 37 — — — 37 Shared service and other revenues — — — 98 (96) 2 Total operating revenues $ 581 $ 332 $ 309 $ 98 $ (99) $ 1,221 2021 Electric revenues $ 523 $ 274 $ 319 $ — $ (3) $ 1,113 Natural gas revenues — 24 — — — 24 Shared service and other revenues — — — 95 (92) 3 Total operating revenues $ 523 $ 298 $ 319 $ 95 $ (95) $ 1,140 Intersegment revenues (c) : 2022 $ 2 $ 2 $ 1 $ 98 $ (101) $ 2 2021 1 2 1 95 (95) 4 Depreciation and amortization: 2022 $ 105 $ 56 $ 72 $ 7 $ — $ 240 2021 96 51 40 7 — 194 Operating expenses: 2022 $ 487 $ 296 $ 283 $ 99 $ (99) $ 1,066 2021 429 255 269 97 (95) 955 Interest expense, net: 2022 $ 38 $ 17 $ 17 $ 1 $ — $ 73 2021 35 16 14 2 — 67 Income (loss) before income taxes: 2022 $ 69 $ 23 $ 11 $ (2) $ — $ 101 2021 72 31 36 (1) — 138 Income Taxes: 2022 $ (1) $ 2 $ — $ — $ — $ 1 2021 (3) 1 (1) — — (3) Net income (loss): 2022 $ 70 $ 21 $ 11 $ (2) $ — $ 100 2021 75 30 37 (1) — 141 Capital Expenditures: 2022 $ 184 $ 91 $ 92 $ — $ — $ 367 2021 219 99 116 (1) — 433 __________ (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 14 — 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. Three Months Ended June 30, 2022 Revenues from contracts with customers ComEd PECO BGE PHI Pepco DPL ACE Electric revenues Residential $ 819 $ 431 $ 334 $ 548 $ 234 $ 155 $ 159 Small commercial & industrial 312 126 70 140 35 51 54 Large commercial & industrial 11 72 129 332 250 30 52 Public authorities & electric railroads 5 7 7 15 8 3 4 Other (a) 234 68 99 164 54 57 55 Total electric revenues (b) $ 1,381 $ 704 $ 639 $ 1,199 $ 581 $ 296 $ 324 Natural gas revenues Residential $ — $ 71 $ 96 $ 17 $ — $ 17 $ — Small commercial & industrial — 29 18 8 — 8 — Large commercial & industrial — — 35 3 — 3 — Transportation — 6 — 3 — 3 — Other (c) — 2 12 6 — 6 — Total Natural gas revenues (d) $ — $ 108 $ 161 $ 37 $ — $ 37 $ — Total revenues from contracts with customers $ 1,381 $ 812 $ 800 $ 1,236 $ 581 $ 333 $ 324 Other revenues Revenues from alternative revenue programs $ 35 $ — $ (20) $ (17) $ (1) $ (2) $ (15) Other electric revenues (e) 9 4 4 2 1 1 — Other natural gas revenues (e) — — 2 — — — — Total other revenues $ 44 $ 4 $ (14) $ (15) $ — $ (1) $ (15) Total revenues for reportable segments $ 1,425 $ 816 $ 786 $ 1,221 $ 581 $ 332 $ 309 Three Months Ended June 30, 2021 Revenues from contracts with customers ComEd PECO BGE PHI Pepco DPL ACE Electric revenues Residential $ 759 $ 383 $ 299 $ 537 $ 223 $ 147 $ 167 Small commercial & industrial 377 99 60 124 32 46 46 Large commercial & industrial 138 59 108 257 188 22 47 Public authorities & electric railroads 11 8 7 17 10 3 4 Other (a) 214 54 87 139 50 46 43 Total electric revenues (b) $ 1,499 $ 603 $ 561 $ 1,074 $ 503 $ 264 $ 307 Natural gas revenues Residential $ — $ 55 $ 81 $ 12 $ — $ 12 $ — Small commercial & industrial — 22 13 6 — 6 — Large commercial & industrial — — 27 1 — 1 — Transportation — 5 — 3 — 3 — Other (c) — 1 6 2 — 2 — Total natural gas revenues (d) $ — $ 83 $ 127 $ 24 $ — $ 24 $ — Total revenues from contracts with customers $ 1,499 $ 686 $ 688 $ 1,098 $ 503 $ 288 $ 307 Other revenues Revenues from alternative revenue programs $ 9 $ 7 $ (10) $ 41 $ 19 $ 10 $ 12 Other electric revenues (e) 9 — 3 1 1 — — Other natural gas revenues (e) — — 1 — — — — Total other revenues $ 18 $ 7 $ (6) $ 42 $ 20 $ 10 $ 12 Total revenues for reportable segments $ 1,517 $ 693 $ 682 $ 1,140 $ 523 $ 298 $ 319 __________ (a) Includes revenues from transmission revenue from PJM, wholesale electric revenue and mutual assistance revenue. (b) Includes operating revenues from affiliates in 2022 and 2021 respectively of: • $3 million, $5 million at ComEd • $1 million, $1 million at PECO • $2 million, $4 million at BGE • $2 million, $4 million at PHI • $2 million, $1 million at Pepco • $2 million, $2 million at DPL • $1 million, $1 million at ACE (c) Includes revenues from off-system natural gas sales. (d) Includes operating revenues from affiliates in 2022 and 2021 respectively of: • less than $1 million, less than $1 million at PECO • $1 million, $3 million at BGE (e) Includes late payment charge revenues. Six Months Ended June 30, 2022 and 2021 ComEd PECO BGE PHI Other (a) Intersegment Exelon Operating revenues (b) : 2022 Electric revenues $ 3,158 $ 1,449 $ 1,366 $ 2,501 $ — $ (14) $ 8,460 Natural gas revenues — 414 574 120 — (2) 1,106 Shared service and other revenues — — — 5 961 (966) — Total operating revenues $ 3,158 $ 1,863 $ 1,940 $ 2,626 $ 961 $ (982) $ 9,566 2021 Electric revenues $ 3,052 $ 1,271 $ 1,190 $ 2,283 $ — $ (16) $ 7,780 Natural gas revenues — 311 466 95 — — 872 Shared service and other revenues — — — 6 1,013 (1,019) — Total operating revenues $ 3,052 $ 1,582 $ 1,656 $ 2,384 $ 1,013 $ (1,035) $ 8,652 Intersegment revenues (c) : 2022 $ 8 $ 2 $ 10 $ 6 $ 961 $ (981) $ 6 2021 11 4 13 7 1,010 (1,033) 12 Depreciation and amortization: 2022 $ 649 $ 185 $ 322 $ 459 $ 32 $ — $ 1,647 2021 589 173 293 404 35 — 1,494 Operating expenses: 2022 $ 2,444 $ 1,432 $ 1,636 $ 2,282 $ 1,086 $ (909) $ 7,971 2021 2,406 1,231 1,372 2,013 943 (713) 7,252 Interest expense, net: 2022 $ 204 $ 84 $ 71 $ 143 $ 195 $ — $ 697 2021 193 80 67 134 169 — 643 Income (loss) from continuing operations before income taxes: 2022 $ 534 $ 363 $ 244 $ 238 $ (125) $ (45) $ 1,209 2021 475 283 233 273 (80) (292) 892 Income Taxes: 2022 $ 119 $ 24 $ 10 $ 8 $ 114 $ (12) $ 263 2021 85 12 (21) 5 (19) (20) 42 Net income (loss) from continuing operations: 2022 $ 415 $ 339 $ 234 $ 230 $ (239) $ (33) $ 946 2021 390 271 254 269 (61) (272) 851 Capital Expenditures: 2022 $ 1,208 $ 658 $ 578 $ 776 $ 60 $ — $ 3,280 2021 1,162 577 620 889 61 — 3,309 Total assets: June 30, 2022 $ 37,194 $ 14,216 $ 13,093 $ 25,592 $ 6,345 $ (4,145) $ 92,295 December 31, 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 14 — Supplemental Financial Information for additional information on total utility taxes. (c) See Note 15 — Related Party Transactions for additional information on intersegment revenues. PHI: Pepco DPL ACE Other (a) Intersegment PHI Operating revenues (b) : 2022 Electric revenues $ 1,195 $ 643 $ 658 $ — $ 5 $ 2,501 Natural gas revenues — 120 — — — 120 Shared service and other revenues — — — 205 (200) 5 Total operating revenues $ 1,195 $ 763 $ 658 $ 205 $ (195) $ 2,626 2021 Electric revenues $ 1,076 $ 585 $ 629 $ — $ (7) $ 2,283 Natural gas revenues — 95 — — — 95 Shared service and other revenues — — — 189 (183) 6 Total operating revenues $ 1,076 $ 680 $ 629 $ 189 $ (190) $ 2,384 Intersegment revenues (c) : 2022 $ 2 $ 3 $ 2 $ 195 $ (196) $ 6 2021 3 4 1 189 (190) 7 Depreciation and amortization: 2022 $ 213 $ 113 $ 118 $ 15 $ — $ 459 2021 199 104 87 14 — 404 Operating expenses: 2022 $ 1,034 $ 653 $ 593 $ 197 $ (195) $ 2,282 2021 895 564 552 192 (190) 2,013 Interest expense, net: 2022 $ 74 $ 33 $ 32 $ 5 $ (1) $ 143 2021 69 30 29 6 — 134 Income (loss) before income taxes: 2022 $ 113 $ 83 $ 38 $ 4 $ — $ 238 2021 137 92 50 (6) — 273 Income Taxes: 2022 $ (3) $ 6 $ 1 $ 4 $ — $ 8 2021 3 6 (1) (3) — 5 Net income (loss): 2022 $ 116 $ 77 $ 37 $ — $ — $ 230 2021 134 86 51 (2) — 269 Capital Expenditures: 2022 $ 402 $ 194 $ 179 $ 1 $ — $ 776 2021 439 211 239 — — 889 Total assets: June 30, 2022 $ 10,226 $ 5,742 $ 5,052 $ 4,775 $ (203) $ 25,592 December 31, 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 14 — 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. Six Months Ended June 30, 2022 Revenues from contracts with customers ComEd PECO BGE PHI Pepco DPL ACE Electric revenues Residential $ 1,675 $ 918 $ 752 $ 1,200 $ 509 $ 362 $ 329 Small commercial & industrial 736 237 151 281 73 107 101 Large commercial & industrial 165 136 260 655 503 56 96 Public authorities & electric railroads 20 15 14 31 16 7 8 Other (a) 472 130 196 359 100 113 136 Total electric revenues (b) $ 3,068 $ 1,436 $ 1,373 $ 2,526 $ 1,201 $ 645 $ 670 Natural gas revenues Residential $ — $ 289 $ 378 $ 68 $ — $ 68 $ — Small commercial & industrial — 105 63 29 — 29 — Large commercial & industrial — — 100 6 — 6 — Transportation — 14 — 7 — 7 — Other (c) — 5 47 10 — 10 — Total natural gas revenues (d) $ — $ 413 $ 588 $ 120 $ — $ 120 $ — Total revenues from contracts with customers $ 3,068 $ 1,849 $ 1,961 $ 2,646 $ 1,201 $ 765 $ 670 Other revenues Revenues from alternative revenue programs $ 75 $ 6 $ (32) $ (22) $ (7) $ (3) $ (12) Other electric revenues (e) 15 7 8 2 1 1 — Other natural gas revenues (e) — 1 3 — — — — Total other revenues $ 90 $ 14 $ (21) $ (20) $ (6) $ (2) $ (12) Total revenues for reportable segments $ 3,158 $ 1,863 $ 1,940 $ 2,626 $ 1,195 $ 763 $ 658 Six Months Ended June 30, 2021 Revenues from contracts with customers ComEd PECO BGE PHI Pepco DPL ACE Electric revenues Residential $ 1,502 $ 816 $ 662 $ 1,142 $ 476 $ 337 $ 329 Small commercial & industrial 744 199 129 242 65 92 85 Large commercial & industrial 271 116 213 505 372 43 90 Public authorities & electric railroads 22 17 13 30 16 7 7 Other (a) 433 106 165 283 101 87 95 Total electric revenues (b) $ 2,972 $ 1,254 $ 1,182 $ 2,202 $ 1,030 $ 566 $ 606 Natural gas revenues Residential $ — $ 215 $ 297 $ 57 $ — $ 57 $ — Small commercial & industrial — 81 48 24 — 24 — Large commercial & industrial — — 81 3 — 3 — Transportation — 12 — 8 — 8 — Other (c) — 3 36 2 — 3 — Total natural gas revenues (d) $ — $ 311 $ 462 $ 94 $ — $ 95 $ — Total revenues from contracts with customers $ 2,972 $ 1,565 $ 1,644 $ 2,296 $ 1,030 $ 661 $ 606 Other revenues Revenues from alternative revenue programs $ 64 $ 17 $ 8 $ 88 $ 46 $ 19 $ 23 Other electric revenues (e) 16 — 3 — — — — Other natural gas revenues (e) — — 1 — — — — Total other revenues $ 80 $ 17 $ 12 $ 88 $ 46 $ 19 $ 23 Total revenues for reportable segments $ 3,052 $ 1,582 $ 1,656 $ 2,384 $ 1,076 $ 680 $ 629 __________ (a) Includes revenues from transmission revenue from PJM, wholesale electric revenue and mutual assistance revenue. (b) Includes operating revenues from affiliates in 2022 and 2021 respectively of: • $8 million, $11 million at ComEd • $2 million, $3 million at PECO • $3 million, $5 million at BGE • $6 million, $7 million at PHI • $2 million, $3 million at Pepco • $3 million, $4 million at DPL • $2 million, $1 million at ACE (c) Includes revenues from off-system natural gas sales. (d) Includes operating revenues from affiliates in 2022 and 2021 respectively of: • less than $1 million, $1 million at PECO • $7 million, $7 million at BGE (e) Includes late payment charge revenues.

Accounts Receivable (Tables)

Accounts Receivable (Tables)	6 Months Ended
Accounts Receivable (Tables)	Jun. 30, 2022
Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net [Abstract]
Allowance for credit loss rollforward	The following tables present the rollforward of Allowance for Credit Losses on Customer Accounts Receivable. Three Months Ended June 30, 2022 Exelon ComEd PECO BGE PHI Pepco DPL ACE Balance as of March 31, 2022 $ 389 $ 92 $ 125 $ 59 $ 113 $ 40 $ 24 $ 49 Plus: Current period (benefit) provision for expected credit losses (9) (5) (10) 2 4 5 — (1) Less: Write-offs, net of recoveries (a) 26 6 8 4 8 3 2 3 Balance as of June 30, 2022 $ 354 $ 81 $ 107 $ 57 $ 109 $ 42 $ 22 $ 45 Three Months Ended June 30, 2021 Exelon ComEd PECO BGE PHI Pepco DPL ACE Balance as of March 31, 2021 $ 377 $ 103 $ 130 $ 43 $ 101 $ 41 $ 25 $ 35 Plus: Current period (benefit) provision for expected credit losses (42) (9) (14) (14) (5) (1) (5) 1 Less: Write-offs, net of recoveries (a) 15 5 5 2 3 2 1 — Balance as of June 30, 2021 $ 320 $ 89 $ 111 $ 27 $ 93 $ 38 $ 19 $ 36 Six Months Ended June 30, 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 (b) 101 21 21 28 31 16 7 8 Less: Write-offs, net of recoveries (a)(c) 67 13 19 9 26 11 3 12 Balance as of June 30, 2022 $ 354 $ 81 $ 107 $ 57 $ 109 $ 42 $ 22 $ 45 Six Months Ended June 30, 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 (benefit) for expected credit losses 28 12 6 (5) 15 10 1 4 Less: Write-offs, net of recoveries (a) 42 20 11 3 8 4 4 — Balance as of June 30, 2021 $ 320 $ 89 $ 111 $ 27 $ 93 $ 38 $ 19 $ 36 __________ (a) Recoveries were not material to the Registrants. (b) For BGE, Pepco, and ACE, the increase is primarily as a result of increased receivable balances due to the increased aging of receivables. (c) For ACE, the increase in 2022 is primarily related to the termination of the moratorium, 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 throughout the year. The following tables present the rollforward of Allowance for Credit Losses on Other Accounts Receivable. Three Months Ended June 30, 2022 Exelon ComEd PECO BGE PHI Pepco DPL ACE Balance as of March 31, 2022 $ 81 $ 20 $ 9 $ 11 $ 41 $ 18 $ 9 $ 14 Plus: Current period provision (benefit) for expected credit losses 2 (2) 2 1 1 2 (1) — Less: Write-offs, net of recoveries (a) 2 — 1 1 — — — — Balance as of June 30, 2022 $ 81 $ 18 $ 10 $ 11 $ 42 $ 20 $ 8 $ 14 Three Months Ended June 30, 2021 Exelon ComEd PECO BGE PHI Pepco DPL ACE Balance as of March 31, 2021 $ 79 $ 22 $ 11 $ 9 $ 37 $ 15 $ 10 $ 12 Plus: Current period (benefit) provision for expected credit losses (5) (3) (3) — 1 1 (1) 1 Less: Write-offs, net of recoveries (a) 3 1 1 1 — — — — Balance as of June 30, 2021 $ 71 $ 18 $ 7 $ 8 $ 38 $ 16 $ 9 $ 13 Six Months Ended June 30, 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 for expected credit losses 15 2 4 4 5 4 — 1 Less: Write-offs, net of recoveries (a) 6 1 1 2 2 — — 2 Balance as of June 30, 2022 $ 81 $ 18 $ 10 $ 11 $ 42 $ 20 $ 8 $ 14 Six Months Ended June 30, 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 5 (2) 1 1 5 3 — 2 Less: Write-offs, net of recoveries (a) 5 1 2 2 — — — — Balance as of June 30, 2021 $ 71 $ 18 $ 7 $ 8 $ 38 $ 16 $ 9 $ 13 __________ (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 June 30, 2022 and December 31, 2021. Unbilled customer revenues (a) Exelon ComEd PECO BGE PHI Pepco DPL ACE June 30, 2022 $ 636 $ 191 $ 138 $ 123 $ 184 $ 94 $ 41 $ 49 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 of accounts receivable	The Utility Registrants are required, under separate legislation and regulations in Illinois, Pennsylvania, Maryland, District of Columbia, Delaware, 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 table presents the total receivables purchased. Total receivables purchased Exelon (a) ComEd PECO BGE (a) PHI Pepco DPL ACE Six months ended June 30, 2022 $ 1,911 $ 456 $ 518 $ 391 $ 546 $ 342 $ 104 $ 100 Six months ended June 30, 2021 1,838 485 507 343 503 310 103 90 __________

Income Taxes (Tables)

Income Taxes (Tables)	6 Months Ended
Income Taxes (Tables)	Jun. 30, 2022
Income Tax Disclosure [Abstract]
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]	The effective income tax rate from continuing operations varies from the U.S. federal statutory rate principally due to the following: Three Months Ended June 30, 2022 (a) Exelon ComEd PECO (b) BGE (b) PHI Pepco (b) DPL 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) (5.4) 7.9 (0.6) 2.1 1.5 (3.4) 7.2 6.7 Plant basis differences (3.3) (0.5) (11.0) (1.3) (1.7) (2.4) (0.7) (1.0) Excess deferred tax amortization (10.5) (5.5) (3.1) (19.0) (19.2) (15.7) (20.0) (24.5) Amortization of investment tax credit, including deferred taxes on basis difference (0.1) (0.1) — (0.1) (0.1) — (0.2) (0.2) Tax credits (0.4) (0.3) — (1.5) (0.4) (0.4) (0.4) (0.4) Other (d) 7.7 — — 1.4 (0.1) (0.5) 1.8 (1.6) Effective income tax rate 9.0 % 22.5 % 6.3 % 2.6 % 1.0 % (1.4) % 8.7 % — % Three Months Ended June 30, 2021 (a) Exelon ComEd PECO (e) BGE (e) PHI Pepco (e) DPL ACE (e) 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 1.1 8.0 (2.9) (12.5) 2.4 (2.1) 7.0 8.1 Plant basis differences (4.0) (0.7) (12.5) (2.3) (1.1) (1.5) (0.7) (0.6) Excess deferred tax amortization (13.4) (7.0) (3.3) (17.5) (22.3) (19.0) (21.9) (28.2) Amortization of investment tax credit, including deferred taxes on basis difference (0.1) (0.1) — (0.1) (0.1) — (0.2) (0.2) Tax credits (1.0) (0.8) — (3.6) (0.8) (0.7) (0.9) (0.6) Other (2.7) (1.1) (0.4) (6.6) (1.3) (1.9) (1.1) (2.3) Effective income tax rate 0.9 % 19.3 % 1.9 % (21.6) % (2.2) % (4.2) % 3.2 % (2.8) % __________ (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. For BGE, the lower effective tax rate is primarily due to the Maryland multi-year plan which resulted in the acceleration of certain income tax benefits. For Pepco, the income tax benefit is primarily due to the Maryland and Washington, D.C. multi-year plans which resulted in the acceleration of certain income tax benefits. For ACE, the lower effective tax rate is primarily due to the acceleration of certain income tax benefits due to distribution rate case settlements. (c) For Exelon, the lower state income taxes, net of federal income tax benefit, is primarily related to a one-time impact associated with a state tax benefit of $43 million and indemnification adjustments pursuant to the Tax Matters Agreement of $5 million as a result of the separation. (d) For Exelon, primarily related to indemnification adjustments pursuant to the Tax Matters Agreement of $48 million. (e) 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 income tax benefit is primarily due to the Maryland multi-year plan which resulted in the acceleration of certain income tax benefits. For ACE, the lower effective tax rate is primarily due to the acceleration of certain income tax benefits due to distribution rate case settlements. Six Months Ended June 30, 2022 (a) Exelon ComEd PECO (b) BGE (b) PHI Pepco (b) DPL 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) 9.9 7.9 (0.3) 2.3 2.8 (3.8) 6.5 6.7 Plant basis differences (3.5) (0.5) (11.2) (1.0) (1.7) (2.5) (0.7) (1.2) Excess deferred tax amortization (11.0) (5.8) (3.2) (17.8) (18.3) (16.3) (19.5) (22.9) Amortization of investment tax credit, including deferred taxes on basis difference (0.1) (0.1) — (0.1) (0.1) — (0.2) (0.2) Tax credits (d) 0.8 (0.3) — (0.6) (0.4) (0.4) (0.3) (0.3) Other (e) 4.7 0.1 0.3 0.3 0.1 (0.7) 0.4 (0.5) Effective income tax rate 21.8 % 22.3 % 6.6 % 4.1 % 3.4 % (2.7) % 7.2 % 2.6 % Six Months Ended June 30, 2021 (a) Exelon ComEd PECO (f) BGE (f) PHI Pepco (f) DPL 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 2.0 7.4 (2.1) (10.5) 4.2 1.5 6.6 7.8 Plant basis differences (3.6) (0.6) (11.3) (1.6) (1.3) (1.8) (0.7) (0.7) Excess deferred tax amortization (12.5) (7.0) (3.3) (15.9) (20.8) (17.2) (19.7) (28.3) Amortization of investment tax credit, including deferred taxes on basis difference (0.1) (0.1) — (0.1) (0.1) — (0.2) (0.2) Tax credits (0.5) (0.5) — (0.9) (0.5) (0.5) (0.4) (0.5) Other (1.6) (2.3) (0.1) (1.0) (0.7) (0.8) (0.1) (1.1) Effective income tax rate 4.7 % 17.9 % 4.2 % (9.0) % 1.8 % 2.2 % 6.5 % (2.0) % __________ (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. For BGE, the lower effective tax rate is primarily due to the Maryland multi-year plan which resulted in the acceleration of certain income tax benefits. For Pepco, the income tax benefit is primarily due to the Maryland and Washington, D.C. multi-year plans which resulted in the acceleration of certain income tax benefits. For ACE, the lower effective tax rate is primarily due to the acceleration of certain income tax benefits due to distribution 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 $4 million as a result of the separation. (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, primarily reflects the nondeductible transaction costs of approximately $19 million arising as part of the separation and indemnification adjustments pursuant to the Tax Matters Agreement of $48 million.
Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block]	Exelon, PHI and ACE have the following unrecognized tax benefits as of June 30, 2022 and December 31, 2021. ComEd's, PECO's, BGE's, Pepco's, and DPL's amounts are not material. Exelon (a) PHI ACE June 30, 2022 $ 147 $ 58 $ 16 December 31, 2021 143 56 16 __________

Retirement Benefits (Tables)

Retirement Benefits (Tables)	6 Months Ended
Retirement Benefits (Tables)	Jun. 30, 2022
Retirement Benefits [Abstract]
Calculation of Net Periodic Benefit Costs	A portion of the net periodic benefit cost for all plans is capitalized within the Consolidated Balance Sheets. The following table presents the components of Exelon's net periodic benefit costs, prior to capitalization, for the three and six months ended June 30, 2022 and 2021. Pension Benefits OPEB Three Months Ended June 30, Three Months Ended June 30, 2022 2021 2022 2021 Components of net periodic benefit cost: Service cost $ 58 $ 75 $ 10 $ 13 Interest cost 110 101 19 17 Expected return on assets (205) (210) (25) (25) Amortization of: Prior service cost (credit) 1 — (5) (7) Actuarial loss 73 99 4 8 Net periodic benefit cost $ 37 $ 65 $ 3 $ 6 Pension Benefits OPEB Six Months Ended June 30, Six Months Ended June 30, 2022 2021 2022 2021 Components of net periodic benefit cost: Service cost $ 119 $ 148 $ 20 $ 26 Interest cost 220 202 38 35 Expected return on assets (414) (421) (50) (50) Amortization of: Prior service cost (credit) 2 1 (10) (13) Actuarial loss 149 199 8 14 Curtailment benefits — — — (1) Net periodic benefit cost $ 76 $ 129 $ 6 $ 11
Allocated Portion of Pension and 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. Three Months Ended June 30, Six Months Ended June 30, Pension and OPEB Costs (Benefit) 2022 2021 2022 2021 Exelon $ 40 $ 71 $ 82 $ 140 ComEd 14 32 30 64 PECO (2) 2 (4) 4 BGE 11 16 22 31 PHI 13 12 26 24 Pepco 2 2 4 3 DPL 1 1 2 1 ACE 3 3 6 5
Defined Contribution Savings Plans	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 allow 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 three and six months ended June 30, 2022 and 2021, respectively. Three Months Ended June 30, Six Months Ended June 30, Savings Plan Matching Contributions 2022 2021 2022 2021 Exelon $ 23 $ 23 $ 43 $ 43 ComEd 10 10 18 18 PECO 3 3 6 6 BGE 3 2 5 4 PHI 4 4 7 7 Pepco 1 1 2 2 DPL 1 1 2 2 ACE 1 1 1 1

Debt and Credit Agreements (Tab

Debt and Credit Agreements (Tables)	6 Months Ended
Debt and Credit Agreements (Tables)	Jun. 30, 2022
Debt Instrument [Line Items]
Schedule of Commercial Paper Borrowings	The following table reflects the Registrants' commercial paper programs as of June 30, 2022 and December 31, 2021. ComEd had no commercial paper borrowings as of June 30, 2022 and December 31, 2021. Outstanding Commercial Average Interest Rate on Commercial Paper Issuer June 30, 2022 December 31, 2021 June 30, 2022 December 31, 2021 Exelon (a) $ 353 $ 599 1.86 % 0.35 % PECO 210 — 1.86 % — % BGE — 130 — % 0.37 % PHI (b) 43 469 1.85 % 0.35 % Pepco 43 175 1.85 % 0.33 % DPL — 149 — % 0.36 % ACE — 145 — % 0.35 % __________ (a) Exelon Corporate had $100 million of outstanding commercial paper borrowings at June 30, 2022 and no outstanding commercial paper borrowings as of December 31, 2021. (b) Represents the consolidated amounts of Pepco, DPL, and ACE.
Schedule of 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 %
Schedule of Long-term Debt Instruments [Table Text Block]	During the six months ended June 30, 2022, the following long-term debt was issued: Company Type Interest Rate Maturity Amount Use of Proceeds Exelon SMBC Term Loan Agreement SOFR plus 0.65% July 21, 2023 $300 Fund a cash payment to Constellation and for general corporate purposes. Exelon U.S. Bank Term Loan Agreement SOFR plus 0.65% July 21, 2023 300 Fund a cash payment to Constellation and for general corporate purposes. Exelon PNC Term Loan Agreement SOFR plus 0.65% July 24, 2023 250 Fund a cash payment to Constellation and for general corporate purposes. Exelon Notes (b) 2.75% March 15, 2027 650 Repay existing indebtedness and for general corporate purposes. Exelon Notes (b) 3.35% March 15, 2032 650 Repay existing indebtedness and for general corporate purposes. Exelon Notes (b) 4.10% March 15, 2052 700 Repay existing indebtedness and for general corporate purposes. ComEd First Mortgage Bonds, Series 132 3.15% March 15, 2032 300 Repay outstanding commercial paper obligations and to fund other general corporate purposes. ComEd First Mortgage Bonds, Series 133 3.85% March 15, 2052 450 Repay outstanding commercial paper obligations and to fund other general corporate purposes. PECO First and Refunding Mortgage Bonds 4.60% May 15, 2052 350 Refinance existing indebtedness and for general corporate purposes. BGE Notes 4.55% June 1, 2052 500 Repay outstanding commercial paper obligations, repay existing indebtedness, and for general corporate purposes. Pepco (a) First Mortgage Bonds 3.97% March 24, 2052 400 Repay existing indebtedness and for general corporate purposes. DPL First Mortgage Bonds 3.06% February 15, 2052 125 Repay existing indebtedness and for general corporate purposes. ACE First Mortgage Bonds 2.27% February 15, 2032 25 Repay existing indebtedness and for general corporate purposes. ACE First Mortgage Bonds 3.06% February 15, 2052 150 Repay existing indebtedness and for general corporate purposes. __________ (a) On March 24, 2022, Pepco entered into a purchase agreement of First Mortgage Bonds of $225 million at 3.35% due on September 15, 2032. The closing date of the issuance is expected to occur in September 2022. (b) In connection with the issuance and sale of the Notes, Exelon entered into a Registration Rights Agreement with the representatives of the initial purchasers of the Notes and other parties. Pursuant to the Registration Rights Agreement, Exelon will be obligated to file a registration statement with respect to an offer to exchange the Notes for substantially similar notes of Exelon that are registered under the Securities Act or, in certain circumstances, register the resale of the Notes. The registered exchange notes, if and when issued, will have terms identical in all material respects to the Notes, except that their issuance will have been registered under the Securities Act.

Fair Value of Financial Asset_2

Fair Value of Financial Assets and Liabilities (Tables)	6 Months Ended
Fair Value of Financial Assets and Liabilities (Tables)	Jun. 30, 2022
Fair Value Disclosures [Abstract]
Fair Value of Financial Liabilities Recorded at Amortized Cost	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 June 30, 2022 and December 31, 2021. The Registrants have no financial liabilities classified as Level 1. 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. June 30, 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 $ 36,294 $ 30,960 $ 2,315 $ 33,275 $ 32,902 $ 34,897 $ 2,217 $ 37,114 ComEd 10,516 9,609 — 9,609 9,773 11,305 — 11,305 PECO 4,192 3,772 50 3,822 4,197 4,740 50 4,790 BGE 4,456 4,096 — 4,096 3,961 4,406 — 4,406 PHI 8,027 4,853 2,265 7,118 7,547 5,970 2,167 8,137 Pepco 3,642 2,465 1,104 3,569 3,445 3,201 975 4,176 DPL 1,938 1,210 503 1,713 1,810 1,426 552 1,978 ACE 1,757 954 658 1,612 1,582 1,091 641 1,732 Long-Term Debt to Financing Trusts Exelon $ 390 $ — $ 398 $ 398 $ 390 $ — $ 470 $ 470 ComEd 205 — 209 209 205 — 248 248 PECO 184 — 189 189 184 — 222 222 __________
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]	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 June 30, 2022 and December 31, 2021: Exelon As of June 30, 2022 As of December 31, 2021 Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Assets Cash equivalents (a) $ 1,319 $ — $ — $ 1,319 $ 524 $ — $ — $ 524 Rabbi trust investments Cash equivalents 63 — — 63 60 — — 60 Mutual funds 52 — — 52 60 — — 60 Fixed income — 8 — 8 — 10 — 10 Life insurance contracts — 59 38 97 — 61 37 98 Rabbi trust investments subtotal 115 67 38 220 120 71 37 228 Mark-to-market derivative assets — — 15 15 — — — — Total assets 1,434 67 53 1,554 644 71 37 752 Liabilities Mark-to-market derivative liabilities — — (103) (103) — — (219) (219) Deferred compensation obligation — (73) — (73) — (131) — (131) Total liabilities — (73) (103) (176) — (131) (219) (350) Total net assets (liabilities) $ 1,434 $ (6) $ (50) $ 1,378 $ 644 $ (60) $ (182) $ 402 __________ (a) Exelon excludes cash of $177 million and $464 million as of June 30, 2022 and December 31, 2021, respectively, and restricted cash of $340 million and $49 million as of June 30, 2022 and December 31, 2021, respectively, and includes long-term restricted cash of $59 million and $44 million as of June 30, 2022 and December 31, 2021, respectively, which is reported in Other deferred debits in the Consolidated Balance Sheets. ComEd, PECO, and BGE ComEd PECO BGE As of June 30, 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) $ 409 $ — $ — $ 409 $ 11 $ — $ — $ 11 $ 318 $ — $ — $ 318 Rabbi trust investments Mutual funds — — — — 9 — — 9 7 — — 7 Life insurance contracts — — — — — 16 — 16 — — — — Rabbi trust investments subtotal — — — — 9 16 — 25 7 — — 7 Mark-to-market derivative assets (b) — — 15 15 — — — — — — — — Total assets 409 — 15 424 20 16 — 36 325 — — 325 Liabilities Mark-to-market derivative liabilities (b) — — (103) (103) — — — — — — — — Deferred compensation obligation — (8) — (8) — (7) — (7) — (4) — (4) Total liabilities — (8) (103) (111) — (7) — (7) — (4) — (4) Total net assets (liabilities) $ 409 $ (8) $ (88) $ 313 $ 20 $ 9 $ — $ 29 $ 325 $ (4) $ — $ 321 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 $21 million and $105 million as of June 30, 2022 and December 31, 2021, respectively, and restricted cash of $133 million and $42 million as of June 30, 2022 and December 31, 2021, respectively, and includes long-term restricted cash of $59 million and $43 million as of June 30, 2022 and December 31, 2021, respectively, which is reported in Other deferred debits in the Consolidated Balance Sheets. PECO excludes cash of $21 million and $35 million as of June 30, 2022 and December 31, 2021, respectively. BGE excludes cash of $36 million and $51 million as of June 30, 2022 and December 31, 2021, respectively, and restricted cash of $205 million and $4 million as of June 30, 2022 and December 31, 2021, respectively. (b) The Level 3 balance consists of the current asset of $15 million and current and noncurrent liability of none and $103 million, respectively, as of June 30, 2022 and none, $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 June 30, 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) $ 557 $ — $ — $ 557 $ 110 $ — $ — $ 110 Rabbi trust investments Cash equivalents 60 — — 60 59 — — 59 Mutual funds 11 — — 11 14 — — 14 Fixed income — 8 — 8 — 10 — 10 Life insurance contracts — 22 37 59 — 27 35 62 Rabbi trust investments subtotal 71 30 37 138 73 37 35 145 Total assets 628 30 37 695 183 37 35 255 Liabilities Deferred compensation obligation — (14) — (14) — (18) — (18) Total liabilities — (14) — (14) — (18) — (18) Total net assets $ 628 $ 16 $ 37 $ 681 $ 183 $ 19 $ 35 $ 237 Pepco DPL ACE As of June 30, 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) $ 115 $ — $ — $ 115 $ 223 $ — $ — $ 223 $ 218 $ — $ — $ 218 Rabbi trust investments Cash equivalents 59 — — 59 — — — — — — — — Life insurance contracts — 22 37 59 — — — — — — — — Rabbi trust investments subtotal 59 22 37 118 — — — — — — — — Total assets 174 22 37 233 223 — — 223 218 — — 218 Liabilities Deferred compensation obligation — (1) — (1) — — — — — — — — Total liabilities — (1) — (1) — — — — — — — — Total net assets $ 174 $ 21 $ 37 $ 232 $ 223 $ — $ — $ 223 $ 218 $ — $ — $ 218 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 $60 million and $100 million as of June 30, 2022 and December 31, 2021, respectively, and restricted cash of $2 million and $3 million as of June 30, 2022 and December 31, 2021, respectively. Pepco excludes cash of $14 million and $34 million as of June 30, 2022 and December 31, 2021, respectively, and restricted cash of $2 million and $3 million as of June 30, 2022 and December 31, 2021, respectively. DPL excludes cash of $26 million and $28 million as of June 30, 2022 and December 31, 2021, respectively. ACE excludes cash of $15 million and $29 million as of June 30, 2022 and December 31, 2021, respectively.
Fair Value Reconciliation of Level 3 Assets and Liabilities Measured at Fair Value on a Recurring Basis	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 three and six months ended June 30, 2022 and 2021: Exelon ComEd PHI and Pepco Three Months Ended June 30, 2022 Total Mark-to-Market Life Insurance Contracts Balance as of April 1, 2022 $ (107) $ (144) $ 36 Total realized / unrealized gains Included in net income (a) 1 — 1 Included in regulatory assets/liabilities 56 56 (b) — Balance at June 30, 2022 $ (50) $ (88) (c) $ 37 The amount of total gains included in income attributed to the change in unrealized gains related to assets and liabilities as of June 30, 2022 $ 1 $ — $ 1 Exelon ComEd PHI and Pepco Three Months Ended June 30, 2021 Total Mark-to-Market Life Insurance Contracts Balance as of April 1, 2021 $ (260) $ (295) $ 35 Total realized / unrealized gains Included in net income (a) 1 — 1 Included in regulatory assets 30 30 (b) — Purchases, sales, and settlements Settlements (2) — (2) Balance as of June 30, 2021 $ (231) $ (265) $ 34 The amount of total gains included in income attributed to the change in unrealized gains related to assets and liabilities as of June 30, 2021 $ 1 $ — $ 1 Exelon ComEd PHI and Pepco Six months ended June 30, 2022 Total Mark-to-Market Life Insurance Contracts Balance as of January 1, 2022 $ (182) $ (219) $ 35 Total realized / unrealized gains Included in net income (a) 2 — 2 Included in regulatory assets/liabilities 131 131 (b) — Transfers out of Level 3 (1) — — Balance as of June 30, 2022 $ (50) $ (88) (c) $ 37 The amount of total gains included in income attributed to the change in unrealized gains related to assets and liabilities as of June 30, 2022 $ 2 $ — $ 2 Exelon ComEd PHI and Pepco Six Months Ended June 30, 2021 Total Mark-to-Market Life Insurance Contracts Balance as of January 1, 2021 $ (267) $ (301) $ 34 Total realized / unrealized gains Included in net income (a) 2 — 2 Included in regulatory assets 36 36 (b) — Purchases, sales, and settlements Settlements (2) — (2) Balance as of June 30, 2021 $ (231) $ (265) $ 34 The amount of total gains included in income attributed to the change in unrealized gain related to assets and liabilities as of June 30, 2021 $ 2 $ — $ 2 __________ (a) Classified in Operating and maintenance expense in the Consolidated Statements of Operations and Comprehensive Income. (b) Includes $59 million of increases in fair value and a decrease for realized gains due to settlements of $3 million recorded in purchased power expense associated with floating-to-fixed energy swap contracts with unaffiliated suppliers for the three months ended June 30, 2022. Includes $25 million of increases in fair value and an increase for realized losses due to settlements of $5 million recorded in purchased power expense associated with floating-to-fixed energy swap contracts with unaffiliated suppliers for the three months ended June 30, 2021. Includes $128 million of increases in fair value and an increase for realized losses due to settlements of $3 million recorded in purchase power expense associated with floating-to-fixed energy swap contracts with unaffiliated suppliers for the six months ended June 30, 2022. Includes $23 million of increases in fair value and an increase for realized losses due to settlements of $13 million recorded in purchased power expense associated with floating-to-fixed energy swap contracts with unaffiliated suppliers for the six months ended June 30, 2021. (c) The balance consists of $15 million of current assets and current and noncurrent liability of none and $103 million, respectively, as of June 30, 2022.
Fair Value Reconciliation of Level 3 Assets and Liabilities Measured at Fair Value on a Recurring Basis, Valuation Technique	Mark-to-Market Derivatives (Exelon and ComEd) The table below discloses the significant unobservable inputs to the forward curve used to value mark-to-market derivatives. Type of trade Fair Value as of June 30, 2022 Fair Value as of December 31, 2021 Valuation Unobservable 2022 Range & Arithmetic Average 2021 Range & Arithmetic Average Mark-to-market derivatives $ (88) $ (219) Discounted Forward power price (a) $30.54 - $89.78 $46.33 $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)	6 Months Ended
Commitments and Contingencies (Tables)	Jun. 30, 2022
Commitments and Contingencies Disclosure [Abstract]
PHI Merger 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 June 30, 2022: Description Exelon PHI Pepco DPL ACE Total commitments $ 513 $ 320 $ 120 $ 89 $ 111 Remaining commitments (a) 61 53 44 6 3 __________ (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 June 30, 2022, representing commitments potentially triggered by future events were as follows: Expiration within Total 2022 2023 2024 2025 2026 2027 and beyond Exelon Letters of credit $ 17 $ 8 $ 9 $ — $ — $ — $ — Surety bonds (a) 185 144 39 2 — — — Financing trust guarantees 378 — — — — — 378 Guaranteed lease residual values (b) 30 — 2 6 6 5 11 Total commercial commitments $ 610 $ 152 $ 50 $ 8 $ 6 $ 5 $ 389 ComEd Letters of credit $ 10 $ 4 $ 6 $ — $ — $ — $ — Surety bonds (a) 16 9 5 2 — — — Financing trust guarantees 200 — — — — — 200 Total commercial commitments $ 226 $ 13 $ 11 $ 2 $ — $ — $ 200 PECO Letters of credit $ 1 $ — $ 1 $ — $ — $ — $ — Surety bonds (a) 3 1 2 — — — — Financing trust guarantees 178 — — — — — 178 Total commercial commitments $ 182 $ 1 $ 3 $ — $ — $ — $ 178 BGE Letters of credit $ 2 $ 2 $ — $ — $ — $ — $ — Surety bonds (a) 2 1 1 — — — — Total commercial commitments $ 4 $ 3 $ 1 $ — $ — $ — $ — PHI Surety bonds (a) $ 95 $ 76 $ 19 $ — $ — $ — $ — Guaranteed lease residual values (b) 30 — 2 6 6 5 11 Total commercial commitments $ 125 $ 76 $ 21 $ 6 $ 6 $ 5 $ 11 Pepco Surety bonds (a) $ 84 $ 71 $ 13 $ — $ — $ — $ — Guaranteed lease residual values (b) 10 — 1 2 2 2 3 Total commercial commitments $ 94 $ 71 $ 14 $ 2 $ 2 $ 2 $ 3 DPL Surety bonds (a) $ 7 $ 3 $ 4 $ — $ — $ — $ — Guaranteed lease residual values (b) 13 — — 3 3 2 5 Total commercial commitments $ 20 $ 3 $ 4 $ 3 $ 3 $ 2 $ 5 ACE Surety bonds (a) $ 4 $ 2 $ 2 $ — $ — $ — $ — Guaranteed lease residual values (b) 7 — 1 1 1 1 3 Total commercial commitments $ 11 $ 2 $ 3 $ 1 $ 1 $ 1 $ 3 __________ (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 $74 million guaranteed by Exelon and PHI, of which $24 million, $31 million, and $19 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 June 30, 2022 and December 31, 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: June 30, 2022 December 31, 2021 Total environmental Portion of total related to Total environmental Portion of total related to Exelon $ 347 $ 299 $ 352 $ 303 ComEd 274 273 279 279 PECO 21 20 22 20 BGE 7 6 6 4 PHI 42 — 42 — Pepco 40 — 40 — DPL 1 — 1 — ACE 1 — 1 —

Changes in Accumulated Other _2

Changes in Accumulated Other Comprehensive Income (Tables)	6 Months Ended
Changes in Accumulated Other Comprehensive Income (Tables)	Jun. 30, 2022
Changes in Accumulated Other Comprehensive Income [Abstract]
Schedule of Changes in Accumulated Other Comprehensive Income (Loss)	The following tables present changes in Exelon's AOCI, net of tax, by component: Three Months Ended June 30, 2022 Cash Flow Hedges Pension and Non-Pension Postretirement Benefit Plan Items (a) Foreign Total Balance at March 31, 2022 $ — $ (713) $ — $ (713) OCI before reclassifications — 2 — 2 Amounts reclassified from AOCI — 10 — 10 Net current-period OCI — 12 — 12 Balance at June 30, 2022 $ — $ (701) $ — $ (701) Three Months Ended June 30, 2021 Cash Flow Hedges Pension and Non-Pension Postretirement Benefit Plan Items (a) Foreign Total Balance at March 31, 2021 $ (5) $ (3,319) $ (22) $ (3,346) OCI before reclassifications — — 2 2 Amounts reclassified from AOCI — 55 — 55 Net current-period OCI — 55 2 57 Balance at June 30, 2021 $ (5) $ (3,264) $ (20) $ (3,289) Six Months Ended June 30, 2022 Cash Flow Hedges Pension and Non-Pension Postretirement Benefit Plan Items (a) Foreign Total Balance at December 31, 2021 $ (6) $ (2,721) $ (23) $ (2,750) Separation of Constellation 6 1,994 23 2,023 OCI before reclassifications — 2 — 2 Amounts reclassified from AOCI — 24 — 24 Net current-period OCI — 26 — 26 Balance at June 30, 2022 $ — $ (701) $ — $ (701) Six Months Ended June 30, 2021 Cash Flow Hedges Pension and Non-Pension Postretirement Benefit Plan Items (a) Foreign Total Balance at December 31, 2020 $ (5) $ (3,372) $ (23) $ (3,400) OCI before reclassifications — (2) 3 1 Amounts reclassified from AOCI — 110 — 110 Net current-period OCI — 108 3 111 Balance at June 30, 2021 $ (5) $ (3,264) $ (20) $ (3,289) __________
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): Three Months Ended June 30, Six Months Ended June 30, 2022 2021 2022 2021 Pension and non-pension postretirement benefit plans: Prior service benefit reclassified to periodic benefit cost $ — $ 1 $ — $ 2 Actuarial loss reclassified to periodic benefit cost (3) (19) (8) (38) Pension and non-pension postretirement benefit plans valuation adjustment (1) (1) — (1)

Supplemental Financial Inform_2

Supplemental Financial Information (Tables)	6 Months Ended
Supplemental Financial Information (Tables)	Jun. 30, 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 Three Months Ended June 30, 2022 Utility taxes (a) $ 203 $ 71 $ 39 $ 20 $ 73 $ 67 $ 5 $ 1 Property 94 10 4 46 33 23 10 — Payroll 28 7 5 4 7 1 1 1 Three Months Ended June 30, 2021 Utility taxes (a) $ 184 $ 61 $ 32 $ 20 $ 71 $ 65 $ 5 $ — Property 86 8 4 43 31 20 10 1 Payroll 32 6 4 5 7 1 1 1 Six Months Ended June 30, 2022 Utility taxes (a) $ 424 $ 149 $ 77 $ 47 $ 151 $ 137 $ 12 $ 2 Property 188 20 9 92 67 46 20 1 Payroll 64 13 8 9 14 3 2 2 Six Months Ended June 30, 2021 Utility taxes (a) $ 377 $ 121 $ 66 $ 45 $ 145 $ 132 $ 11 $ 1 Property 173 16 9 85 63 42 19 1 Payroll 64 13 8 9 14 3 3 2 _________ (a) The Registrants' utility taxes represent 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 Three Months Ended June 30, 2022 AFUDC — Equity $ 38 $ 9 $ 8 $ 6 $ 15 $ 11 $ 2 $ 2 Non-service net periodic benefit cost 16 — — — — — — — Three Months Ended June 30, 2021 AFUDC — Equity $ 34 $ 9 $ 6 $ 7 $ 12 $ 10 $ 1 $ 1 Non-service net periodic benefit cost 26 — — — — — — — Six Months Ended June 30, 2022 AFUDC — Equity $ 74 $ 17 $ 15 $ 12 $ 30 $ 22 $ 4 $ 4 Non-service net periodic benefit cost 33 — — — — — — — Six Months Ended June 30, 2021 AFUDC — Equity $ 64 $ 13 $ 12 $ 14 $ 25 $ 20 $ 3 $ 2 Non-service net periodic benefit cost 46 — — — — — — —
Cash Flow Supplemental Disclosures	The following tables provide additional information about material items recorded in the Registrants' Consolidated Statements of Cash Flows. Depreciation and amortization Exelon (a) ComEd PECO BGE PHI Pepco DPL ACE Six Months Ended June 30, 2022 Property, plant, and equipment (b) $ 1,376 $ 511 $ 177 $ 235 $ 335 $ 145 $ 92 $ 83 Amortization of regulatory assets (b) 357 138 8 87 124 68 21 35 Amortization of intangible assets, net (b) 8 — — — — — — — Amortization of energy contract assets and liabilities (c) 3 — — — — — — — Nuclear fuel (d) 66 — — — — — — — ARO accretion (e) 44 — — — — — — — Total depreciation, amortization, and accretion $ 1,854 $ 649 $ 185 $ 322 $ 459 $ 213 $ 113 $ 118 Six Months Ended June 30, 2021 Property, plant, and equipment (b) $ 3,043 $ 480 $ 165 $ 215 $ 309 $ 135 $ 84 $ 76 Amortization of regulatory assets (b) 291 109 8 78 95 64 20 11 Amortization of intangible assets, net (b) 29 — — — — — — — Amortization of energy contract assets and liabilities (c) 13 — — — — — — — Nuclear fuel (d) 549 — — — — — — — ARO accretion (e) 255 — — — — — — — Total depreciation, amortization, and accretion $ 4,180 $ 589 $ 173 $ 293 $ 404 $ 199 $ 104 $ 87 __________ (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 Operating revenues or Purchased power and fuel expense in Exelon’s Consolidated Statements of Operations and Comprehensive Income. (d) Included in Purchased fuel expense in Exelon's Consolidated Statement of Operations and Comprehensive Income. (e) Included in Operating and maintenance expense in Exelon's Consolidated Statement of Operations and Comprehensive Income. Other non-cash operating activities Exelon (a) ComEd PECO BGE PHI Pepco DPL ACE Six Months Ended June 30, 2022 Pension and non-pension postretirement benefit costs $ 86 $ 30 $ (4) $ 22 $ 26 $ 4 $ 2 $ 6 Allowance for credit losses 96 29 21 18 29 16 6 7 Other decommissioning-related activity 36 — — — — — — — Energy-related options 60 — — — — — — — True-up adjustments to decoupling mechanisms and formula rates (b) (27) (75) (6) 32 22 7 3 12 Long-term incentive plan 40 — — — — — — — Amortization of operating ROU asset 38 1 — 14 14 4 4 2 AFUDC — Equity (74) (17) (15) (12) (30) (22) (4) (4) Six Months Ended June 30, 2021 Pension and non-pension postretirement benefit costs $ 196 $ 64 $ 4 $ 29 $ 24 $ 3 $ 1 $ 5 Allowance for credit losses 100 24 17 4 9 5 2 2 Other decommissioning-related activity (636) — — — — — — — Energy-related options 20 — — — — — — — True-up adjustments to decoupling mechanisms and formula rates (b) (176) (64) (17) (8) (88) (46) (19) (23) Long-term incentive plan 62 — — — — — — — Amortization of operating ROU asset 83 1 — 15 14 3 5 2 AFUDC — Equity (64) (13) (12) (14) (25) (20) (3) (2) __________ (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 BGE, Pepco, DPL, and ACE, reflects the change in regulatory assets and liabilities associated with their decoupling mechanisms and transmission formula rates. For PECO, reflects the change in regulatory assets and liabilities associated with its transmission formula rates. See Note 3 — Regulatory Matters of the 2021 Recast Form 10-K for additional information. The following tables provide a reconciliation of cash, cash equivalents, and restricted cash 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 June 30, 2022 Cash and cash equivalents $ 816 $ 120 $ 23 $ 354 $ 278 $ 14 $ 26 $ 233 Restricted cash and cash equivalents 961 384 9 205 341 117 223 — Restricted cash included in other long-term assets 59 59 — — — — — — Total cash, restricted cash, and cash equivalents $ 1,836 $ 563 $ 32 $ 559 $ 619 $ 131 $ 249 $ 233 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 from discontinued operations 582 — — — — — — — Total cash, restricted cash, and cash equivalents $ 1,619 $ 384 $ 44 $ 55 $ 213 $ 68 $ 71 $ 29 June 30, 2021 Cash and cash equivalents $ 1,578 $ 71 $ 376 $ 368 $ 61 $ 17 $ 17 $ 11 Restricted cash and cash equivalents 379 240 8 3 42 33 5 3 Restricted cash included in other long-term assets 52 43 — — 9 — — 9 Total cash, restricted cash, and cash equivalents (a) $ 2,009 $ 354 $ 384 $ 371 $ 112 $ 50 $ 22 $ 23 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 from discontinued operations 332 — — — — — — — Total cash, restricted cash, and cash equivalents $ 1,166 $ 405 $ 26 $ 145 $ 160 $ 65 $ 15 $ 30 __________ (a) Exelon's amounts include amounts related to Generation prior to the separation. See Note 2 — Discontinued Operations for additional information. For additional information on restricted cash see Note 1 — Significant Accounting Policies of the 2021 Recast Form 10-K.
Supplemental Balance Sheet Disclosures	The following table provides additional information about material items recorded in the Registrants' Consolidated Balance Sheets. Accrued expenses Exelon ComEd PECO BGE PHI Pepco DPL ACE June 30, 2022 Compensation-related accruals (a) $ 428 $ 109 $ 57 $ 54 $ 82 $ 26 $ 16 $ 13 Taxes accrued 243 94 60 31 84 57 12 11 Interest accrued 331 124 40 44 59 31 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)	6 Months Ended
Related Party Transactions (Tables)	Jun. 30, 2022
Related Party Transactions [Abstract]
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 : Three Months Ended June 30, Six Months Ended June 30, 2022 2021 2022 2021 ComEd (a) $ — $ 78 $ 59 $ 163 PECO (b) — 41 33 83 BGE (c) — 58 18 130 PHI — 77 51 176 Pepco (d) — 55 39 130 DPL (e) — 17 10 37 ACE (f) — 5 2 9 __________ (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.
BSC and PHISCO Service Companies	The following table presents the service company costs allocated to the Registrants: Operating and maintenance from affiliates Capitalized costs Three Months Ended June 30, Six Months Ended June 30, Three Months Ended June 30, Six Months Ended June 30, 2022 2021 2022 2021 2022 2021 2022 2021 Exelon BSC $ 139 $ 114 $ 344 $ 249 PHISCO 21 17 40 36 ComEd BSC $ 80 $ 72 $ 165 $ 143 67 45 152 102 PECO BSC 47 40 96 80 20 17 56 44 BGE BSC 51 45 102 88 22 20 60 43 PHI BSC 46 37 96 76 30 32 76 60 PHISCO — — — — 21 17 40 36 Pepco BSC 27 23 56 45 11 13 28 25 PHISCO 29 28 58 57 8 7 16 15 DPL BSC 17 15 35 29 9 10 23 19 PHISCO 25 24 49 49 7 5 13 11 ACE BSC 14 12 29 24 10 8 25 15 PHISCO 22 21 43 43 6 5 11 10
Current Receivables From/Payables To Affiliates	The following tables present current receivables from affiliates and current payables to affiliates: June 30, 2022 Receivables from affiliates: Payables to affiliates: ComEd PECO BGE Pepco DPL ACE BSC PHISCO Other Total ComEd $ — $ — $ — $ — $ — $ 57 $ — $ 8 $ 65 PECO $ — — — — — 25 — 4 29 BGE — — — — — 28 — 2 30 PHI — — — — — — 5 — 10 15 Pepco — — — — 1 14 13 1 29 DPL — — — 9 — 9 10 1 29 ACE — — — — — 9 10 1 20 Other 3 — — — — — — — 3 Total $ 3 $ — $ — $ 9 $ — $ 1 $ 147 $ 33 $ 27 $ 220 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
Long Term Debt to Financing Trusts	The following table presents Long-term debt to financing trusts: June 30, 2022 December 31, 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 (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Retained earnings/Undistributed earnings (losses)	$ 4,161				$ 4,161		$ 16,942
Deferred income taxes and unamortized investment tax credits	11,240				11,240		10,611
Net income (loss)	465	$ 598	$ 476	$ (264)	1,063	$ 211
Atlantic City Electric Company [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Retained earnings/Undistributed earnings (losses)	(16)				(16)		(15)
Deferred income taxes and unamortized investment tax credits	695				695		682
Net income (loss)	11	26	37	14	37	51
Pepco Holdings LLC [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Retained earnings/Undistributed earnings (losses)	(375)				(375)		(210)
Deferred income taxes and unamortized investment tax credits	2,752				2,752		$ 2,675
Net income (loss)	$ 100	$ 130	$ 141	$ 128	$ 230	$ 269

Discontinued Operations and Dis

Discontinued Operations and Disposal Groups (Details) - USD ($) $ in Millions	3 Months Ended	5 Months Ended	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2022	Jun. 30, 2022	Feb. 01, 2022	Jan. 31, 2022
Discontinued Operations - Income Statement
Discontinued Operation, Intra-Entity Amounts, Discontinued Operation after Disposal, Expense	$ 69	$ 125
Exelon Generation Co L L C [Member]
Discontinued Operations - Income Statement
Net assets				$ (11,573)
Discontinued Operation, Intra-Entity Amounts, Discontinued Operation after Disposal, Expense	11	20
Corporate, Non-Segment [Member]
Discontinued Operations - Income Statement
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] \| ShortTermDebtSOFRplus0.75Jan2023
Discontinued Operations - Income Statement
Short-term Bank Loans and Notes Payable	1,150	1,150	1,150
Corporate, Non-Segment [Member] \| SMBCTermLoanJuly2023 \| Notes Payable to Banks [Member]
Discontinued Operations - Income Statement
Debt Instrument, Face Amount	300	300	300
Corporate, Non-Segment [Member] \| USBTermLoanJuly2023 \| Notes Payable to Banks [Member]
Discontinued Operations - Income Statement
Debt Instrument, Face Amount	300	300	300
Corporate, Non-Segment [Member] \| PNCTermLoanJuly2023 \| Notes Payable to Banks [Member]
Discontinued Operations - Income Statement
Debt Instrument, Face Amount	$ 250	$ 250	$ 250

Discontinued Operations and D_2

Discontinued Operations and Disposal Groups (Details) - Income Statement - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Discontinued Operations - Income Statement
Operating and maintenance	$ 1,109	$ 1,073	$ 2,288	$ 2,155
Cost, Depreciation and Amortization	830	736	1,647	1,494
Taxes, Miscellaneous	330	314	684	631
Costs and Expenses	3,543	3,444	7,971	7,252
Other, net	175	73	313	131
Nonoperating Income (Expense)	(183)	(251)	(384)	(512)
Income taxes	46	3	263	42
Income (Loss) from Equity Method Investments	0	0	0	1
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	0	150	117	(640)
Net income (loss) attributable to noncontrolling interests	0	75	1	99
Net Income (Loss) from Discontinued Operations Available to Common Shareholders, Basic	$ 0	75	116	(739)
Total transaction and transition costs incurred related to the Separation		4	52	7
Total transaction costs relating to the Separation			19
Exelon Generation Co L L C [Member]
Discontinued Operations - Income Statement
Revenue from Contract with Customer, Including Assessed Tax		3,900	1,855	9,165
Revenue from Related Parties		255	161	549
Disposal Group, Including Discontinued Operation, Revenue		4,155	2,016	9,714
Purchased power and/or fuel		1,947	1,138	6,557
Operating and maintenance		1,382	371	2,287
Cost, Depreciation and Amortization		930	94	1,869
Taxes, Miscellaneous		118	44	239
Costs and Expenses		4,377	1,647	10,952
Gain (Loss) on Disposition of Assets		8	10	79
Disposal Group, Including Discontinued Operation, Operating Income (Loss)		(214)	379	(1,159)
Disposal Group, Including Discontinued Operation, Interest Expense		(72)	(20)	(140)
Other, net		508	(281)	675
Nonoperating Income (Expense)		436	(301)	535
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax		222	78	(624)
Income taxes		71	(40)	13
Income (Loss) from Equity Method Investments		(1)	(1)	(3)
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest		150	117	(640)
Net income (loss) attributable to noncontrolling interests		75	1	99
Net Income (Loss) from Discontinued Operations Available to Common Shareholders, Basic		$ 75	$ 116	$ (739)

Discontinued Operations and D_3

Discontinued Operations and Disposal Groups (Details) - Balance Sheet - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021	Jun. 30, 2021	Dec. 31, 2020
Discontinued Operations - Income Statement
Restricted cash	$ 961	$ 321	$ 379	$ 349
Customer accounts receivable	2,219	2,189
Accounts Receivable, Allowance for Credit Loss, Current	(354)	(320)
Other accounts receivable	1,403	1,068
Allowance for Credit Loss, Receivable, Other, Current	(81)	(72)
Other Receivables, Net, Current	1,322	996
Fossil fuel and emission allowances	133	105
Materials and supplies inventory, net	491	476
Current assets of discontinued operations	0	7,835
Accumulated depreciation and amortization	15,242	14,430
Investments	235	250
Other Assets, Noncurrent	1,017	885
Property, plant, and equipment, deferred debits, and other assets of discontinued operations	0	38,509
Assets	92,295	133,013
Short-term Debt	2,003	1,248
Long-term Debt and Lease Obligation, Current	505	2,153
Mark-to-market derivative liabilities (current liabilities)	0	18
Current liabilities of discontinued operations	0	7,940
Long-term Debt, Excluding Current Maturities	35,789	30,749
Deferred income taxes and unamortized investment tax credits	11,240	10,611
Asset retirement obligations, noncurrent	275	271
Derivative Liability, Noncurrent	103	201
Other	2,054	1,573
Long-term debt, deferred credits, and other liabilities of discontinued operations	0	25,676
Liabilities	$ 68,639	98,218
Exelon Generation Co L L C [Member]
Discontinued Operations - Income Statement
Disposal Group, Including Discontinued Operation, Cash and Cash Equivalents		510
Restricted cash		72
Customer accounts receivable		1,724
Accounts Receivable, Allowance for Credit Loss, Current		(55)
Disposal Group, Including Discontinued Operation, Accounts, Notes and Loans Receivable, Net		1,669
Other accounts receivable		596
Allowance for Credit Loss, Receivable, Other, Current		(4)
Other Receivables, Net, Current		592
Mark-to-market derivative assets, current		2,169
Fossil fuel and emission allowances		284
Materials and supplies inventory, net		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
Current assets of discontinued operations		7,835
Accumulated depreciation and amortization		15,888
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment, Noncurrent		19,661
Nuclear decommissioning trust funds		15,938
Investments		193
Derivative Asset, Noncurrent		949
Other Assets, Noncurrent		1,768
Property, plant, and equipment, deferred debits, and other assets of discontinued operations		38,509
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 liabilities)		981
Energy Marketing Accounts Payable		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		1,161
Long-term debt, deferred credits, and other liabilities of discontinued operations		25,676
Liabilities		$ 33,616

Discontinued Operations and D_4

Discontinued Operations and Disposal Groups (Details) - Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Discontinued Operations - Income Statement
Depreciation, Amortization and Accretion, Net	$ 1,854	$ 4,180
Gain (Loss) on Sale of Assets and Asset Impairment Charges	(8)	(83)
Deferred income taxes and amortization of investment tax credits	143	(163)
Net fair value changes related to derivatives	(59)	(490)
Net realized and unrealized (gains) losses on NDT funds	205	(376)
Net unrealized (gains) losses on equity investments	16	(96)
Other non-cash operating activities	(276)	331
Payments to Acquire Property, Plant, and Equipment	(3,507)	(4,040)
Collection of deferred purchase price	169	2,209
Decrease in capital expenditures not paid	(276)	(313)
Increase in deferred purchase price	348	1,958
Increase in PPE related to ARO update	(335)	2
Exelon Generation Co L L C [Member]
Discontinued Operations - Income Statement
Depreciation, Amortization and Accretion, Net	207	2,686
Asset Impairment Charges	0	493
Gain (Loss) on Sale of Assets and Asset Impairment Charges	9	(79)
Deferred income taxes and amortization of investment tax credits	(143)	(268)
Net fair value changes related to derivatives	(59)	(490)
Net realized and unrealized (gains) losses on NDT funds	205	(376)
Net unrealized (gains) losses on equity investments	16	(96)
Other non-cash operating activities	36	(636)
Payments to Acquire Property, Plant, and Equipment	(227)	(731)
Collection of deferred purchase price	169	2,209
Decrease in capital expenditures not paid	(128)	(66)
Increase in deferred purchase price	348	1,958
Increase in PPE related to ARO update	$ 335	$ 0

Mergers, Acquisitions, and Disp

Mergers, Acquisitions, and Dispositions - Narrative (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Business Dispositions
Gain (Loss) on Sale of Assets and Asset Impairment Charges	$ 8	$ 83

Regulatory Matters - Schedule o

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

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]

Requested Revenue Requirement Increase (Decrease)

$ 51

Approved Revenue Requirement Increase (Decrease)

$ 46

Approved Return on Equity, Percentage

7.36%

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

Regulatory Matters Completed Rate Cases [Line Items]

Approved Revenue Requirement Increase (Decrease)

$ 37

Approved Return on Equity, Percentage

7.36%

Public Utilities, Approved Equity Capital Structure, Percentage

5.72%

Basis points for ComEd's Revenue Requirement

580

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

Regulatory Matters Completed Rate Cases [Line Items]

Approved Return on Equity, Percentage

7.29%

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

$ 9

Public Utilities, Approved Equity Capital Structure, Percentage

5.69%

Basis points for ComEd's Revenue Requirement

580

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

Regulatory Matters Completed Rate Cases [Line Items]

Basis points for ComEd's Revenue Requirement

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

Regulatory Matters Completed Rate Cases [Line Items]

Requested Revenue Requirement Increase (Decrease)

$ 246

Approved Revenue Requirement Increase (Decrease)

$ 132

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

Approved Revenue Requirement Increase (Decrease)

$ 140

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]

Approved Revenue Requirement Increase (Decrease)

$ 59

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

Regulatory Matters Completed Rate Cases [Line Items]

Approved Revenue Requirement Increase (Decrease)

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

Regulatory Matters Completed Rate Cases [Line Items]

Approved Revenue Requirement Increase (Decrease)

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

Regulatory Matters Completed Rate Cases [Line Items]

Public Utilities, Approved Rate Increase (Decrease), Percentage

25%

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

Approved Revenue Requirement Increase (Decrease)

$ 74

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]

Approved Revenue Requirement Increase (Decrease)

$ 53

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

Regulatory Matters Completed Rate Cases [Line Items]

Approved Revenue Requirement Increase (Decrease)

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

Regulatory Matters Completed Rate Cases [Line Items]

Approved Revenue Requirement Increase (Decrease)

$ 10

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

Regulatory Matters Completed Rate Cases [Line Items]

Public Utilities, Approved Rate Increase (Decrease), Percentage

50%

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

Approved Revenue Requirement Increase (Decrease)

$ 52

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]

Approved Revenue Requirement Increase (Decrease)

$ 21

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

Regulatory Matters Completed Rate Cases [Line Items]

Approved Revenue Requirement Increase (Decrease)

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

Regulatory Matters Completed Rate Cases [Line Items]

Approved Revenue Requirement Increase (Decrease)

$ 15

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

Regulatory Matters Completed Rate Cases [Line Items]

Public Utilities, Approved Rate Increase (Decrease), Percentage

25%

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

Regulatory Matters Completed Rate Cases [Line Items]

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

$ 136

Approved Revenue Requirement Increase (Decrease)

$ 109

Approved Return on Equity, Percentage

9.275%

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

Regulatory Matters Completed Rate Cases [Line Items]

Approved Revenue Requirement Increase (Decrease)

$ 42

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

Regulatory Matters Completed Rate Cases [Line Items]

Approved Revenue Requirement Increase (Decrease)

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

Regulatory Matters Completed Rate Cases [Line Items]

Approved Revenue Requirement Increase (Decrease)

(22)

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

Regulatory Matters Completed Rate Cases [Line Items]

Approved Revenue Requirement Increase (Decrease)

$ (40)

Delmarva Power and 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

Approved Revenue Requirement Increase (Decrease)

$ 13

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

Approved Revenue Requirement Increase (Decrease)

$ 41

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]

Approved Revenue Requirement Increase (Decrease)

$ 11

Regulatory Matters - Schedule_2

Regulatory Matters - Schedule of Pending Rate Cases (Details) - USD ($) $ in Millions	May 19, 2022	Apr. 15, 2022	Mar. 31, 2022	Feb. 28, 2022
Commonwealth Edison Co [Member] \| Illinois 2022 Electric Distribution Base Rate Case
Regulatory Matters Pending Rate Cases [Line Items]
Requested Revenue Requirement Increase (Decrease)		$ 199
Commonwealth Edison Co [Member] \| Illinois 2022 Electric Distribution Base Rate Case \| 2023
Regulatory Matters Pending Rate Cases [Line Items]
Requested Return on Equity, Percentage		7.85%
Public Utilities, Requested Rate Increase (Decrease), Initial Revenue Requirement, Amount		$ 144
Requested Return on Distribution Rate Base, Percentage		5.94%
Basis points for ComEd's Revenue Requirement		580
Commonwealth Edison Co [Member] \| Illinois 2022 Electric Distribution Base Rate Case \| 2021
Regulatory Matters Pending Rate Cases [Line Items]
Requested Return on Equity, Percentage		7.78%
Public Utilities Requested Rate Increase (Decrease), Prior Year Annual Reconciliation		$ 55
Requested Return on Distribution Rate Base, Percentage		5.91%
Basis points for ComEd's Revenue Requirement		580
Commonwealth Edison Co [Member] \| Illinois 2022 Electric Distribution Base Rate Case \| Performance Metrics Penalty \| 2021
Regulatory Matters Pending Rate Cases [Line Items]
Basis points for ComEd's Revenue Requirement		7
PECO Energy Co [Member] \| Pennsylvania 2022 Natural Gas Distribution Base Rate Case
Regulatory Matters Pending Rate Cases [Line Items]
Requested Revenue Requirement Increase (Decrease)			$ 82
Requested Return on Equity, Percentage			10.95%
Delmarva Power and Light Company [Member] \| Delaware 2022 Natural Gas Distribution Base Rate Case
Regulatory Matters Pending Rate Cases [Line Items]
Requested Revenue Requirement Increase (Decrease)				$ 15
Requested Return on Equity, Percentage				10.30%
Delmarva Power and Light Company [Member] \| Maryland 2022 Electric Distribution Base Rate Case
Regulatory Matters Pending Rate Cases [Line Items]
Requested Revenue Requirement Increase (Decrease)	$ 38
Requested Return on Equity, Percentage	10.25%
Delmarva Power and Light Company [Member] \| Maryland 2022 Electric Distribution Base Rate Case \| 2023
Regulatory Matters Pending Rate Cases [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Initial Revenue Requirement, Amount	$ 23
Public Utilities, Requested Rate Increase (Decrease), Tax Benefits	12
Delmarva Power and Light Company [Member] \| Maryland 2022 Electric Distribution Base Rate Case \| 2024
Regulatory Matters Pending Rate Cases [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Initial Revenue Requirement, Amount	8
Public Utilities, Requested Rate Increase (Decrease), Tax Benefits	8
Delmarva Power and Light Company [Member] \| Maryland 2022 Electric Distribution Base Rate Case \| 2025
Regulatory Matters Pending Rate Cases [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Initial Revenue Requirement, Amount	$ 7

Regulatory Matters - Annual Ele

Regulatory Matters - Annual Electric Transmission Fillings (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			(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	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				(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%
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		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%
Delmarva Power and 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		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%
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		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%

Regulatory Matters - Energy Eff

Regulatory Matters - Energy Efficiency Formula Rate (Details) - ComEd 2022 Energy Efficiency Formula Rate [Domain] - Commonwealth Edison Co [Member] - USD ($) $ in Millions		12 Months Ended
	Jun. 01, 2022	Dec. 31, 2021
Schedule of Energy Efficiency Formula Rate Updates [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount	$ 66
Public Utilities Requested Rate Increase (Decrease), Prior Year Annual Reconciliation	(16)
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount	$ 50
Public Utilities, Requested Equity Capital Structure, Percentage	5.94%
Requested Return on Equity, Percentage	7.85%
Basis points for ComEd's Revenue Requirement	580
Public Utilities, Approved Equity Capital Structure, Percentage		5.52%
Public Utilities, Approved Return on Equity, Percentage		6.99%

Regulatory Matters - Capitalize

Regulatory Matters - Capitalized Ratemaking Amount Not Recognized (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Public Utility, Property, Plant and Equipment [Line Items]
Public Utilities, Amount of Allowance for Earnings on Equity Capitalized for Rate Making Purposes	$ 49	$ 43
Commonwealth Edison Co [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Public Utilities, Amount of Allowance for Earnings on Equity Capitalized for Rate Making Purposes	4	1
PECO Energy Co [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Public Utilities, Amount of Allowance for Earnings on Equity Capitalized for Rate Making Purposes	0	0
Baltimore Gas and Electric Company [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Public Utilities, Amount of Allowance for Earnings on Equity Capitalized for Rate Making Purposes	32	37
Pepco Holdings LLC [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Public Utilities, Amount of Allowance for Earnings on Equity Capitalized for Rate Making Purposes	13	5
Potomac Electric Power Company [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Public Utilities, Amount of Allowance for Earnings on Equity Capitalized for Rate Making Purposes	11	3
Delmarva Power and Light Company [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Public Utilities, Amount of Allowance for Earnings on Equity Capitalized for Rate Making Purposes	2	2
Atlantic City Electric Company [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Public Utilities, Amount of Allowance for Earnings on Equity Capitalized for Rate Making Purposes	$ 0	$ 0

Regulatory Matters - Narrative

Regulatory Matters - Narrative (Details) - USD ($) $ in Millions	6 Months Ended	36 Months Ended
	Jun. 30, 2022	Dec. 31, 2025	Mar. 31, 2022
Commonwealth Edison Co [Member]
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Assets	$ 254
Increase (Decrease) in Regulatory Liabilities	(617)
Beneficial electrification planned expenditure		$ 300
Commonwealth Edison Co [Member] \| Nuclear Decommissioning [Member]
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Liabilities	(788)
Commonwealth Edison Co [Member] \| Deferred Income Tax Charge [Member]
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Liabilities	(45)
Commonwealth Edison Co [Member] \| Renewable portfolio standards costs
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Liabilities	162
Commonwealth Edison Co [Member] \| Removal Costs [Member]
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Liabilities	33
Commonwealth Edison Co [Member] \| Carbon Mitigation Credit rider
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Assets	255
Regulatory Assets	255
Commonwealth Edison Co [Member] \| Electric Distribution Formula Rate Annual Reconciliations
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Assets	89
Commonwealth Edison Co [Member] \| Energy Efficiency Costs
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Assets	29
Commonwealth Edison Co [Member] \| Renewable Energy Program [Member]
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Assets	(116)
PECO Energy Co [Member]
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Assets	103
Increase (Decrease) in Regulatory Liabilities	(325)
PECO Energy Co [Member] \| Nuclear Decommissioning [Member]
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Liabilities	(305)
PECO Energy Co [Member] \| Electric Energy and Natural Gas Cost [Member]
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Liabilities	(12)
PECO Energy Co [Member] \| Deferred Income Tax Charge [Member]
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Assets	99
Baltimore Gas and Electric Company [Member]
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Assets	(49)
Baltimore Gas and Electric Company [Member] \| Electric Energy and Natural Gas Cost [Member]
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Assets	(14)
Baltimore Gas and Electric Company [Member] \| Energy Efficiency and Demand Response Programs
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Assets	(13)
Baltimore Gas and Electric Company [Member] \| Under-recovered revenue decoupling
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Assets	(20)
Potomac Electric Power Company [Member]
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Assets	(47)
Increase (Decrease) in Regulatory Liabilities	(44)
Potomac Electric Power Company [Member] \| Deferred Income Tax Charge [Member]
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Liabilities	(46)
Potomac Electric Power Company [Member] \| Energy Efficiency and Demand Response Programs
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Assets	(10)
Potomac Electric Power Company [Member] \| DC PLUG Charge
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Assets	(17)
Potomac Electric Power Company [Member] \| Under-recovered revenue decoupling
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Assets	(20)
Atlantic City Electric Company [Member]
Regulatory Matters Additional Narrative Information [Line Items]
Contract Termination Liability	180		$ 203
Increase (Decrease) in Regulatory Assets	179
Increase (Decrease) in Regulatory Liabilities	(16)
Gain (Loss) on Contract Termination	23
Atlantic City Electric Company [Member] \| Other Current Liabilities
Regulatory Matters Additional Narrative Information [Line Items]
Contract Termination Liability	87
Atlantic City Electric Company [Member] \| Other Noncurrent Liabilities
Regulatory Matters Additional Narrative Information [Line Items]
Contract Termination Liability	93
Atlantic City Electric Company [Member] \| Deferred Income Tax Charge [Member]
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Liabilities	$ (13)

Revenue from Contracts with C_3

Revenue from Contracts with Customers - Change in Contract with Customer, Asset and Liability (Details) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2021	Dec. 31, 2020
Contract Liabilities [Roll Forward]
Contract with Customer, Liability, Current	$ 105	$ 107	$ 113	$ 116	$ 109	$ 118
Revenues recognized, contract liabilities	(2)	(2)	(3)	(2)
Pepco Holdings LLC [Member]
Contract Liabilities [Roll Forward]
Contract with Customer, Liability, Current	105	107	113	116	109	118
Revenues recognized, contract liabilities	(2)	(2)	(3)	(2)
Potomac Electric Power Company [Member]
Contract Liabilities [Roll Forward]
Contract with Customer, Liability, Current	84	85	91	92	87	94
Revenues recognized, contract liabilities	(1)	(2)	(1)	(2)
Delmarva Power and Light Company [Member]
Contract Liabilities [Roll Forward]
Contract with Customer, Liability, Current	11	11	11	12	11	12
Revenues recognized, contract liabilities	0	0	(1)	0
Atlantic City Electric Company [Member]
Contract Liabilities [Roll Forward]
Contract with Customer, Liability, Current	10	11	11	12	$ 11	$ 12
Revenues recognized, contract liabilities	$ (1)	$ 0	$ (1)	$ 0

Revenue from Contract with Cust

Revenue from Contract with Customer - Performance Obligations (Details) $ in Millions	Jun. 30, 2022 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 105
Pepco Holdings LLC [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	105
Potomac Electric Power Company [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	84
Delmarva Power and Light Company [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	11
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]: 2022-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 4
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	6 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-07-01 \| Pepco Holdings LLC [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 4
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	6 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-07-01 \| Potomac Electric Power Company [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 3
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	6 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-07-01 \| Delmarva Power and 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	6 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-07-01 \| 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	6 months
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 and 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 and 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 and 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	$ 82
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	$ 82
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	$ 65
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 and 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]: 2026-01-01 \| 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)	6 Months Ended
Segment Information - Narrative (Details)	Jun. 30, 2022 Reportable_segment
Segment Reporting Information [Line Items]
Number of reportable segments	6
Pepco Holdings LLC [Member]
Segment Reporting Information [Line Items]
Number of reportable segments	3

Segment Information - Reconcili

Segment Information - Reconciliation to Consolidated Financial Statements (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Segment Reporting Information [Line Items]
Revenues	$ 4,239		$ 4,020		$ 9,566	$ 8,652
Income (Loss) before income taxes	511		329		1,209	892
Income taxes	46		3		263	42
Net income (loss)	465	$ 598	476	$ (264)	1,063	211
Capital expenditures					3,507	4,040
Assets	92,295				92,295		$ 133,013
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	465		326		946	851
Pepco Holdings LLC [Member]
Segment Reporting Information [Line Items]
Revenues	1,221		1,140		2,626	2,384
Revenue from Related Parties	2		4		6	7
Income (Loss) before income taxes	101		138		238	273
Income taxes	1		(3)		8	5
Net income (loss)	100	$ 130	141	$ 128	230	269
Capital expenditures					776	889
Assets	25,592				25,592		24,744
Operating Segment [Member]
Segment Reporting Information [Line Items]
Revenues	4,239		4,020		9,566	8,652
Revenue from Related Parties	0		5		6	12
Depreciation and Amortization	830		736		1,647	1,494
Operating Expenses	3,543		3,444		7,971	7,252
Interest expense, net	358		324		697	643
Income (Loss) before income taxes	511		329		1,209	892
Income taxes	46		3		263	42
Capital expenditures	1,585		1,563		3,280	3,309
Assets	92,295				92,295		86,669
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	465		326		946	851
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenues	(393)		(536)		(982)	(1,035)
Revenue from Related Parties	(393)		(535)		(981)	(1,033)
Depreciation and Amortization	1		0		0	0
Operating Expenses	(378)		(374)		(909)	(713)
Interest expense, net	1		0		0	0
Income (Loss) before income taxes	(1)		(144)		(45)	(292)
Income taxes	0		(7)		(12)	(20)
Capital expenditures	0		0		0	0
Assets	(4,145)				(4,145)		(8,319)
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	(1)		(137)		(33)	(272)
Intersegment Eliminations [Member] \| Pepco Holdings LLC [Member]
Segment Reporting Information [Line Items]
Revenues	(99)		(95)		(195)	(190)
Revenue from Related Parties	(101)		(95)		(196)	(190)
Depreciation and Amortization	0		0		0	0
Operating Expenses	(99)		(95)		(195)	(190)
Interest expense, net	0		0		(1)	0
Income (Loss) before income taxes	0		0		0	0
Income taxes	0		0		0	0
Net income (loss)	0		0		0	0
Capital expenditures	0		0		0	0
Assets	(203)				(203)		(60)
Commonwealth Edison Co [Member] \| Operating Segment [Member]
Segment Reporting Information [Line Items]
Revenues	1,425		1,517		3,158	3,052
Depreciation and Amortization	328		296		649	589
Operating Expenses	1,039		1,196		2,444	2,406
Interest expense, net	104		98		204	193
Income (Loss) before income taxes	293		238		534	475
Income taxes	66		46		119	85
Capital expenditures	591		549		1,208	1,162
Assets	37,194				37,194		36,470
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	227		192		415	390
Commonwealth Edison Co [Member] \| Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue from Related Parties	3		5		8	11
PECO Energy Co [Member] \| Operating Segment [Member]
Segment Reporting Information [Line Items]
Revenues	816		693		1,863	1,582
Depreciation and Amortization	93		87		185	173
Operating Expenses	639		552		1,432	1,231
Interest expense, net	43		42		84	80
Income (Loss) before income taxes	142		106		363	283
Income taxes	9		2		24	12
Capital expenditures	314		282		658	577
Assets	14,216				14,216		13,824
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	133		104		339	271
PECO Energy Co [Member] \| Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue from Related Parties	1		2		2	4
Baltimore Gas and Electric Company [Member] \| Operating Segment [Member]
Segment Reporting Information [Line Items]
Revenues	786		682		1,940	1,656
Depreciation and Amortization	152		141		322	293
Operating Expenses	717		620		1,636	1,372
Interest expense, net	36		34		71	67
Income (Loss) before income taxes	38		37		244	233
Income taxes	1		(8)		10	(21)
Capital expenditures	275		284		578	620
Assets	13,093				13,093		12,324
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	37		45		234	254
Baltimore Gas and Electric Company [Member] \| Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue from Related Parties	3		7		10	13
Pepco Holdings LLC [Member] \| Operating Segment [Member]
Segment Reporting Information [Line Items]
Revenues	1,221		1,140		2,626	2,384
Depreciation and Amortization	240		194		459	404
Operating Expenses	1,066		955		2,282	2,013
Interest expense, net	73		67		143	134
Income (Loss) before income taxes	101		138		238	273
Income taxes	1		(3)		8	5
Net income (loss)	100		141		230	269
Capital expenditures	367		433		776	889
Assets	25,592				25,592		24,744
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	100		141		230	269
Pepco Holdings LLC [Member] \| Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue from Related Parties	2		4		6	7
Potomac Electric Power Company [Member] \| Operating Segment [Member]
Segment Reporting Information [Line Items]
Revenues	581		523		1,195	1,076
Depreciation and Amortization	105		96		213	199
Operating Expenses	487		429		1,034	895
Interest expense, net	38		35		74	69
Income (Loss) before income taxes	69		72		113	137
Income taxes	(1)		(3)		(3)	3
Net income (loss)	70		75		116	134
Capital expenditures	184		219		402	439
Assets	10,226				10,226		9,903
Potomac Electric Power Company [Member] \| Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue from Related Parties	2		1		2	3
Delmarva Power and Light Company [Member] \| Operating Segment [Member]
Segment Reporting Information [Line Items]
Revenues	332		298		763	680
Depreciation and Amortization	56		51		113	104
Operating Expenses	296		255		653	564
Interest expense, net	17		16		33	30
Income (Loss) before income taxes	23		31		83	92
Income taxes	2		1		6	6
Net income (loss)	21		30		77	86
Capital expenditures	91		99		194	211
Assets	5,742				5,742		5,412
Delmarva Power and Light Company [Member] \| Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue from Related Parties	2		2		3	4
Atlantic City Electric Company [Member] \| Operating Segment [Member]
Segment Reporting Information [Line Items]
Revenues	309		319		658	629
Depreciation and Amortization	72		40		118	87
Operating Expenses	283		269		593	552
Interest expense, net	17		14		32	29
Income (Loss) before income taxes	11		36		38	50
Income taxes	0		(1)		1	(1)
Net income (loss)	11		37		37	51
Capital expenditures	92		116		179	239
Assets	5,052				5,052		4,556
Atlantic City Electric Company [Member] \| Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue from Related Parties	1		1		2	1
Corporate and Other [Member] \| Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Revenues	384		524		961	1,013
Depreciation and Amortization	16		18		32	35
Operating Expenses	460		495		1,086	943
Interest expense, net	101		83		195	169
Income (Loss) before income taxes	(62)		(46)		(125)	(80)
Income taxes	(31)		(27)		114	(19)
Capital expenditures	38		15		60	61
Assets	6,345				6,345		7,626
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	(31)		(19)		(239)	(61)
Corporate and Other [Member] \| Corporate, Non-Segment [Member] \| Pepco Holdings LLC [Member]
Segment Reporting Information [Line Items]
Revenues	98		95		205	189
Depreciation and Amortization	7		7		15	14
Operating Expenses	99		97		197	192
Interest expense, net	1		2		5	6
Income (Loss) before income taxes	(2)		(1)		4	(6)
Income taxes	0		0		4	(3)
Net income (loss)	(2)		(1)		0	(2)
Capital expenditures	0		(1)		1	0
Assets	4,775				4,775		$ 4,933
Corporate and Other [Member] \| Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue from Related Parties	384		522		961	1,010
Corporate and Other [Member] \| Intersegment Eliminations [Member] \| Pepco Holdings LLC [Member]
Segment Reporting Information [Line Items]
Revenue from Related Parties	98		95		195	189
Rate-regulated electric revenues [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	3,934		3,739		8,415	7,609
Rate-regulated electric revenues [Member] \| Pepco Holdings LLC [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	1,199		1,071		2,522	2,195
Rate-regulated electric revenues [Member] \| Operating Segment [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	3,938		3,789		8,460	7,780
Rate-regulated electric revenues [Member] \| Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	(6)		(9)		(14)	(16)
Rate-regulated electric revenues [Member] \| Intersegment Eliminations [Member] \| Pepco Holdings LLC [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	(3)		(3)		5	(7)
Rate-regulated electric revenues [Member] \| Commonwealth Edison Co [Member] \| Operating Segment [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	1,425		1,517		3,158	3,052
Rate-regulated electric revenues [Member] \| PECO Energy Co [Member] \| Operating Segment [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	708		610		1,449	1,271
Rate-regulated electric revenues [Member] \| Baltimore Gas and Electric Company [Member] \| Operating Segment [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	629		558		1,366	1,190
Rate-regulated electric revenues [Member] \| Pepco Holdings LLC [Member] \| Operating Segment [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	1,182		1,113		2,501	2,283
Rate-regulated electric revenues [Member] \| Potomac Electric Power Company [Member] \| Operating Segment [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	581		523		1,195	1,076
Rate-regulated electric revenues [Member] \| Delmarva Power and Light Company [Member] \| Operating Segment [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	295		274		643	585
Rate-regulated electric revenues [Member] \| Atlantic City Electric Company [Member] \| Operating Segment [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	309		319		658	629
Rate-regulated electric revenues [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	0
Rate-regulated electric revenues [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	0
Rate-regulated natural gas revenues [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	307		234		1,124	867
Rate-regulated natural gas revenues [Member] \| Pepco Holdings LLC [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	37		24		120	94
Rate-regulated natural gas revenues [Member] \| Operating Segment [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	301		231		1,106	872
Rate-regulated natural gas revenues [Member] \| Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	(1)		0		(2)	0
Rate-regulated natural gas revenues [Member] \| Intersegment Eliminations [Member] \| Pepco Holdings LLC [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	0		0		0	0
Rate-regulated natural gas revenues [Member] \| Commonwealth Edison Co [Member] \| Operating Segment [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	0		0		0	0
Rate-regulated natural gas revenues [Member] \| PECO Energy Co [Member] \| Operating Segment [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	108		83		414	311
Rate-regulated natural gas revenues [Member] \| Baltimore Gas and Electric Company [Member] \| Operating Segment [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	157		124		574	466
Rate-regulated natural gas revenues [Member] \| Pepco Holdings LLC [Member] \| Operating Segment [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	37		24		120	95
Rate-regulated natural gas revenues [Member] \| Potomac Electric Power Company [Member] \| Operating Segment [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	0		0		0	0
Rate-regulated natural gas revenues [Member] \| Delmarva Power and Light Company [Member] \| Operating Segment [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	37		24		120	95
Rate-regulated natural gas revenues [Member] \| Atlantic City Electric Company [Member] \| Operating Segment [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	0		0		0	0
Rate-regulated natural gas revenues [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	0
Rate-regulated natural gas revenues [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	0
Shared service and other revenues [Member] \| Operating Segment [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	0		0		0	0
Shared service and other revenues [Member] \| Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	(386)		(527)		(966)	(1,019)
Shared service and other revenues [Member] \| Intersegment Eliminations [Member] \| Pepco Holdings LLC [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	(96)		(92)		(200)	(183)
Shared service and other revenues [Member] \| Commonwealth Edison Co [Member] \| Operating Segment [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	0		0		0	0
Shared service and other revenues [Member] \| PECO Energy Co [Member] \| Operating Segment [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	0		0		0	0
Shared service and other revenues [Member] \| Baltimore Gas and Electric Company [Member] \| Operating Segment [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	0		0		0	0
Shared service and other revenues [Member] \| Pepco Holdings LLC [Member] \| Operating Segment [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	2		3		5	6
Shared service and other revenues [Member] \| Potomac Electric Power Company [Member] \| Operating Segment [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	0		0		0	0
Shared service and other revenues [Member] \| Delmarva Power and Light Company [Member] \| Operating Segment [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	0		0		0	0
Shared service and other revenues [Member] \| Atlantic City Electric Company [Member] \| Operating Segment [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	0		0		0	0
Shared service and other revenues [Member] \| Corporate and Other [Member] \| Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	384		524		961	1,013
Shared service and other revenues [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	$ 98		$ 95		$ 205	$ 189

Segment Information - Electric

Segment Information - Electric and Gas Revenue by Customer Class (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Revenue, Major Customer [Line Items]
Revenues	$ 4,239	$ 4,020	$ 9,566	$ 8,652
Operating Segment [Member]
Revenue, Major Customer [Line Items]
Revenues	4,239	4,020	9,566	8,652
Revenue from Related Parties	0	5	6	12
Commonwealth Edison Co [Member]
Revenue, Major Customer [Line Items]
Revenues	1,425	1,517	3,158	3,052
Revenue from Related Parties	3	5	8	11
Commonwealth Edison Co [Member] \| Regulated Operation [Member]
Revenue, Major Customer [Line Items]
Revenues	1,381	1,499	3,068	2,972
Commonwealth Edison Co [Member] \| Other Regulated Revenue [Member]
Revenue, Major Customer [Line Items]
Revenues	44	18	90	80
PECO Energy Co [Member]
Revenue, Major Customer [Line Items]
Revenues	816	693	1,863	1,582
Revenue from Related Parties	1	2	2	4
PECO Energy Co [Member] \| Regulated Operation [Member]
Revenue, Major Customer [Line Items]
Revenues	812	686	1,849	1,565
PECO Energy Co [Member] \| Other Regulated Revenue [Member]
Revenue, Major Customer [Line Items]
Revenues	4	7	14	17
Baltimore Gas and Electric Company [Member]
Revenue, Major Customer [Line Items]
Revenues	786	682	1,940	1,656
Revenue from Related Parties	3	7	10	13
Baltimore Gas and Electric Company [Member] \| Regulated Operation [Member]
Revenue, Major Customer [Line Items]
Revenues	800	688	1,961	1,644
Baltimore Gas and Electric Company [Member] \| Other Regulated Revenue [Member]
Revenue, Major Customer [Line Items]
Revenues	(14)	(6)	(21)	12
Pepco Holdings LLC [Member]
Revenue, Major Customer [Line Items]
Revenues	1,221	1,140	2,626	2,384
Revenue from Related Parties	2	4	6	7
Pepco Holdings LLC [Member] \| Regulated Operation [Member]
Revenue, Major Customer [Line Items]
Revenues	1,236	1,098	2,646	2,296
Pepco Holdings LLC [Member] \| Other Regulated Revenue [Member]
Revenue, Major Customer [Line Items]
Revenues	(15)	42	(20)	88
Potomac Electric Power Company [Member]
Revenue, Major Customer [Line Items]
Revenues	581	523	1,195	1,076
Revenue from Related Parties	2	1	2	3
Potomac Electric Power Company [Member] \| Regulated Operation [Member]
Revenue, Major Customer [Line Items]
Revenues	581	503	1,201	1,030
Potomac Electric Power Company [Member] \| Other Regulated Revenue [Member]
Revenue, Major Customer [Line Items]
Revenues	0	20	(6)	46
Delmarva Power and Light Company [Member]
Revenue, Major Customer [Line Items]
Revenues	332	298	763	680
Revenue from Related Parties	2	2	3	4
Delmarva Power and Light Company [Member] \| Regulated Operation [Member]
Revenue, Major Customer [Line Items]
Revenues	333	288	765	661
Delmarva Power and Light Company [Member] \| Other Regulated Revenue [Member]
Revenue, Major Customer [Line Items]
Revenues	(1)	10	(2)	19
Atlantic City Electric Company [Member]
Revenue, Major Customer [Line Items]
Revenues	309	319	658	629
Revenue from Related Parties	1	1	2	1
Atlantic City Electric Company [Member] \| Regulated Operation [Member]
Revenue, Major Customer [Line Items]
Revenues	324	307	670	606
Atlantic City Electric Company [Member] \| Other Regulated Revenue [Member]
Revenue, Major Customer [Line Items]
Revenues	(15)	12	(12)	23
Rate-regulated electric revenues [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	3,934	3,739	8,415	7,609
Rate-regulated electric revenues [Member] \| Operating Segment [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	3,938	3,789	8,460	7,780
Rate-regulated electric revenues [Member] \| Commonwealth Edison Co [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	1,387	1,503	3,075	2,977
Rate-regulated electric revenues [Member] \| Commonwealth Edison Co [Member] \| Regulated Operation [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	1,381	1,499	3,068	2,972
Revenue from Related Parties	3	5	8	11
Rate-regulated electric revenues [Member] \| Commonwealth Edison Co [Member] \| Regulated Operation [Member] \| Operating Segment [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	9	9	15	16
Rate-regulated electric revenues [Member] \| Commonwealth Edison Co [Member] \| Regulated Operation [Member] \| Residential [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	819	759	1,675	1,502
Rate-regulated electric revenues [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	312	377	736	744
Rate-regulated electric revenues [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	11	138	165	271
Rate-regulated electric revenues [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	5	11	20	22
Rate-regulated electric revenues [Member] \| Commonwealth Edison Co [Member] \| Regulated Operation [Member] \| Other [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	234	214	472	433
Rate-regulated electric revenues [Member] \| PECO Energy Co [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	707	602	1,441	1,251
Rate-regulated electric revenues [Member] \| PECO Energy Co [Member] \| Regulated Operation [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	704	603	1,436	1,254
Revenue from Related Parties	1	1	2	3
Rate-regulated electric revenues [Member] \| PECO Energy Co [Member] \| Regulated Operation [Member] \| Operating Segment [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	4	0	7	0
Rate-regulated electric revenues [Member] \| PECO Energy Co [Member] \| Regulated Operation [Member] \| Residential [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	431	383	918	816
Rate-regulated electric revenues [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	126	99	237	199
Rate-regulated electric revenues [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	72	59	136	116
Rate-regulated electric revenues [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	7	8	15	17
Rate-regulated electric revenues [Member] \| PECO Energy Co [Member] \| Regulated Operation [Member] \| Other [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	68	54	130	106
Rate-regulated electric revenues [Member] \| Baltimore Gas and Electric Company [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	642	560	1,377	1,180
Rate-regulated electric revenues [Member] \| Baltimore Gas and Electric Company [Member] \| Regulated Operation [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	639	561	1,373	1,182
Revenue from Related Parties	2	4	3	5
Rate-regulated electric revenues [Member] \| Baltimore Gas and Electric Company [Member] \| Regulated Operation [Member] \| Operating Segment [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	4	3	8	3
Rate-regulated electric revenues [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	334	299	752	662
Rate-regulated electric revenues [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	70	60	151	129
Rate-regulated electric revenues [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	129	108	260	213
Rate-regulated electric revenues [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	7	7	14	13
Rate-regulated electric revenues [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	99	87	196	165
Rate-regulated electric revenues [Member] \| Pepco Holdings LLC [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	1,199	1,071	2,522	2,195
Rate-regulated electric revenues [Member] \| Pepco Holdings LLC [Member] \| Regulated Operation [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	1,199	1,074	2,526	2,202
Revenue from Related Parties	2	4	6	7
Rate-regulated electric revenues [Member] \| Pepco Holdings LLC [Member] \| Regulated Operation [Member] \| Operating Segment [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	2	1	2	0
Rate-regulated electric revenues [Member] \| Pepco Holdings LLC [Member] \| Regulated Operation [Member] \| Residential [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	548	537	1,200	1,142
Rate-regulated electric revenues [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	140	124	281	242
Rate-regulated electric revenues [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	332	257	655	505
Rate-regulated electric revenues [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	15	17	31	30
Rate-regulated electric revenues [Member] \| Pepco Holdings LLC [Member] \| Regulated Operation [Member] \| Other [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	164	139	359	283
Rate-regulated electric revenues [Member] \| Potomac Electric Power Company [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	580	503	1,200	1,027
Rate-regulated electric revenues [Member] \| Potomac Electric Power Company [Member] \| Regulated Operation [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	581	503	1,201	1,030
Revenue from Related Parties	2	1	2	3
Rate-regulated electric revenues [Member] \| Potomac Electric Power Company [Member] \| Regulated Operation [Member] \| Operating Segment [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	1	1	1	0
Rate-regulated electric revenues [Member] \| Potomac Electric Power Company [Member] \| Regulated Operation [Member] \| Residential [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	234	223	509	476
Rate-regulated electric revenues [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	35	32	73	65
Rate-regulated electric revenues [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	250	188	503	372
Rate-regulated electric revenues [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	8	10	16	16
Rate-regulated electric revenues [Member] \| Potomac Electric Power Company [Member] \| Regulated Operation [Member] \| Other [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	54	50	100	101
Rate-regulated electric revenues [Member] \| Delmarva Power and Light Company [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	295	262	643	562
Rate-regulated electric revenues [Member] \| Delmarva Power and Light Company [Member] \| Regulated Operation [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	296	264	645	566
Revenue from Related Parties	2	2	3	4
Rate-regulated electric revenues [Member] \| Delmarva Power and Light Company [Member] \| Regulated Operation [Member] \| Operating Segment [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	1	0	1	0
Rate-regulated electric revenues [Member] \| Delmarva Power and Light Company [Member] \| Regulated Operation [Member] \| Residential [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	155	147	362	337
Rate-regulated electric revenues [Member] \| Delmarva Power and Light Company [Member] \| Regulated Operation [Member] \| Small Commercial & Industrial [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	51	46	107	92
Rate-regulated electric revenues [Member] \| Delmarva Power and Light Company [Member] \| Regulated Operation [Member] \| Large Commercial & Industrial [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	30	22	56	43
Rate-regulated electric revenues [Member] \| Delmarva Power and Light Company [Member] \| Regulated Operation [Member] \| Public Authorities & Electric Railroads [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	3	3	7	7
Rate-regulated electric revenues [Member] \| Delmarva Power and Light Company [Member] \| Regulated Operation [Member] \| Other [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	57	46	113	87
Rate-regulated electric revenues [Member] \| Atlantic City Electric Company [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	323	306	668	605
Rate-regulated electric revenues [Member] \| Atlantic City Electric Company [Member] \| Regulated Operation [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	324	307	670	606
Revenue from Related Parties	1	1	2	1
Rate-regulated electric revenues [Member] \| Atlantic City Electric Company [Member] \| Regulated Operation [Member] \| Operating Segment [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	0	0	0	0
Rate-regulated electric revenues [Member] \| Atlantic City Electric Company [Member] \| Regulated Operation [Member] \| Residential [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	159	167	329	329
Rate-regulated electric revenues [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	54	46	101	85
Rate-regulated electric revenues [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	52	47	96	90
Rate-regulated electric revenues [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	4	4	8	7
Rate-regulated electric revenues [Member] \| Atlantic City Electric Company [Member] \| Regulated Operation [Member] \| Other [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	55	43	136	95
Rate-regulated natural gas revenues [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	307	234	1,124	867
Rate-regulated natural gas revenues [Member] \| Operating Segment [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	301	231	1,106	872
Rate-regulated natural gas revenues [Member] \| Commonwealth Edison Co [Member] \| Regulated Operation [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	0	0	0	0
Rate-regulated natural gas revenues [Member] \| Commonwealth Edison Co [Member] \| Regulated Operation [Member] \| Operating Segment [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	0	0	0	0
Rate-regulated natural gas revenues [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	0
Rate-regulated natural gas revenues [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	0
Rate-regulated natural gas revenues [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	0
Rate-regulated natural gas revenues [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	0
Rate-regulated natural gas revenues [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	0
Rate-regulated natural gas revenues [Member] \| PECO Energy Co [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	108	82	414	310
Rate-regulated natural gas revenues [Member] \| PECO Energy Co [Member] \| Regulated Operation [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	108	83	413	311
Revenue from Related Parties	0	0	0	1
Rate-regulated natural gas revenues [Member] \| PECO Energy Co [Member] \| Regulated Operation [Member] \| Operating Segment [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	0	0	1	0
Rate-regulated natural gas revenues [Member] \| PECO Energy Co [Member] \| Regulated Operation [Member] \| Residential [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	71	55	289	215
Rate-regulated natural gas revenues [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	29	22	105	81
Rate-regulated natural gas revenues [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	0
Rate-regulated natural gas revenues [Member] \| PECO Energy Co [Member] \| Regulated Operation [Member] \| Transportation [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	6	5	14	12
Rate-regulated natural gas revenues [Member] \| PECO Energy Co [Member] \| Regulated Operation [Member] \| Other [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	2	1	5	3
Rate-regulated natural gas revenues [Member] \| Baltimore Gas and Electric Company [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	161	125	585	455
Rate-regulated natural gas revenues [Member] \| Baltimore Gas and Electric Company [Member] \| Regulated Operation [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	161	127	588	462
Revenue from Related Parties	1	3	7	7
Rate-regulated natural gas revenues [Member] \| Baltimore Gas and Electric Company [Member] \| Regulated Operation [Member] \| Operating Segment [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	2	1	3	1
Rate-regulated natural gas revenues [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	96	81	378	297
Rate-regulated natural gas revenues [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	18	13	63	48
Rate-regulated natural gas revenues [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	35	27	100	81
Rate-regulated natural gas revenues [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	0
Rate-regulated natural gas revenues [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	12	6	47	36
Rate-regulated natural gas revenues [Member] \| Pepco Holdings LLC [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	37	24	120	94
Rate-regulated natural gas revenues [Member] \| Pepco Holdings LLC [Member] \| Regulated Operation [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	37	24	120	94
Rate-regulated natural gas revenues [Member] \| Pepco Holdings LLC [Member] \| Regulated Operation [Member] \| Operating Segment [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	0	0	0	0
Rate-regulated natural gas revenues [Member] \| Pepco Holdings LLC [Member] \| Regulated Operation [Member] \| Residential [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	17	12	68	57
Rate-regulated natural gas revenues [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	8	6	29	24
Rate-regulated natural gas revenues [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	3	1	6	3
Rate-regulated natural gas revenues [Member] \| Pepco Holdings LLC [Member] \| Regulated Operation [Member] \| Transportation [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	3	3	7	8
Rate-regulated natural gas revenues [Member] \| Pepco Holdings LLC [Member] \| Regulated Operation [Member] \| Other [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	6	2	10	2
Rate-regulated natural gas revenues [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	0
Rate-regulated natural gas revenues [Member] \| Potomac Electric Power Company [Member] \| Regulated Operation [Member] \| Operating Segment [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	0	0	0	0
Rate-regulated natural gas revenues [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	0
Rate-regulated natural gas revenues [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	0
Rate-regulated natural gas revenues [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	0
Rate-regulated natural gas revenues [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	0
Rate-regulated natural gas revenues [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	0
Rate-regulated natural gas revenues [Member] \| Delmarva Power and Light Company [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	37	24	120	95
Rate-regulated natural gas revenues [Member] \| Delmarva Power and Light Company [Member] \| Regulated Operation [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	37	24	120	95
Rate-regulated natural gas revenues [Member] \| Delmarva Power and Light Company [Member] \| Regulated Operation [Member] \| Operating Segment [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	0	0	0	0
Rate-regulated natural gas revenues [Member] \| Delmarva Power and Light Company [Member] \| Regulated Operation [Member] \| Residential [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	17	12	68	57
Rate-regulated natural gas revenues [Member] \| Delmarva Power and Light Company [Member] \| Regulated Operation [Member] \| Small Commercial & Industrial [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	8	6	29	24
Rate-regulated natural gas revenues [Member] \| Delmarva Power and Light Company [Member] \| Regulated Operation [Member] \| Large Commercial & Industrial [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	3	1	6	3
Rate-regulated natural gas revenues [Member] \| Delmarva Power and Light Company [Member] \| Regulated Operation [Member] \| Transportation [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	3	3	7	8
Rate-regulated natural gas revenues [Member] \| Delmarva Power and Light Company [Member] \| Regulated Operation [Member] \| Other [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	6	2	10	3
Rate-regulated natural gas revenues [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	0
Rate-regulated natural gas revenues [Member] \| Atlantic City Electric Company [Member] \| Regulated Operation [Member] \| Operating Segment [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	0	0	0	0
Rate-regulated natural gas revenues [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	0
Rate-regulated natural gas revenues [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	0
Rate-regulated natural gas revenues [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	0
Rate-regulated natural gas revenues [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	0
Rate-regulated natural gas revenues [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	0
Alternative revenue programs [Member] \| Commonwealth Edison Co [Member] \| Regulated Operation [Member] \| Operating Segment [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	35	9	75	64
Alternative revenue programs [Member] \| PECO Energy Co [Member] \| Regulated Operation [Member] \| Operating Segment [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	0	7	6	17
Alternative revenue programs [Member] \| Baltimore Gas and Electric Company [Member] \| Regulated Operation [Member] \| Operating Segment [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	(20)	(10)	(32)	8
Alternative revenue programs [Member] \| Pepco Holdings LLC [Member] \| Regulated Operation [Member] \| Operating Segment [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	(17)	41	(22)	88
Alternative revenue programs [Member] \| Potomac Electric Power Company [Member] \| Regulated Operation [Member] \| Operating Segment [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	(1)	19	(7)	46
Alternative revenue programs [Member] \| Delmarva Power and Light Company [Member] \| Regulated Operation [Member] \| Operating Segment [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	(2)	10	(3)	19
Alternative revenue programs [Member] \| Atlantic City Electric Company [Member] \| Regulated Operation [Member] \| Operating Segment [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	$ (15)	$ 12	$ (12)	$ 23

Accounts Receivable - Allowance

Accounts Receivable - Allowance for Credit Losses Rollforward (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current period provision for expected credit losses			$ (96)	$ (100)
Commonwealth Edison Co [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current period provision for expected credit losses			(29)	(24)
PECO Energy Co [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current period provision for expected credit losses			(21)	(17)
Baltimore Gas and Electric Company [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current period provision for expected credit losses			(18)	(4)
Pepco Holdings LLC [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current period provision for expected credit losses			(29)	(9)
Potomac Electric Power Company [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current period provision for expected credit losses			(16)	(5)
Delmarva Power and Light Company [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current period provision for expected credit losses			(6)	(2)
Atlantic City Electric Company [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current period provision for expected credit losses			(7)	(2)
Customer accounts receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	$ 389	$ 377	320	334
Current period provision for expected credit losses	(9)	(42)	101	28
Writeoffs, net of recoveries	26	15	67	42
Ending balance	354	320	354	320
Customer accounts receivable \| Commonwealth Edison Co [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	92	103	73	97
Current period provision for expected credit losses	(5)	(9)	21	12
Writeoffs, net of recoveries	6	5	13	20
Ending balance	81	89	81	89
Customer accounts receivable \| PECO Energy Co [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	125	130	105	116
Current period provision for expected credit losses	(10)	(14)	21	6
Writeoffs, net of recoveries	8	5	19	11
Ending balance	107	111	107	111
Customer accounts receivable \| Baltimore Gas and Electric Company [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	59	43	38	35
Current period provision for expected credit losses	2	(14)	28	(5)
Writeoffs, net of recoveries	4	2	9	3
Ending balance	57	27	57	27
Customer accounts receivable \| Pepco Holdings LLC [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	113	101	104	86
Current period provision for expected credit losses	4	(5)	31	15
Writeoffs, net of recoveries	8	3	26	8
Ending balance	109	93	109	93
Customer accounts receivable \| Potomac Electric Power Company [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	40	41	37	32
Current period provision for expected credit losses	5	(1)	16	10
Writeoffs, net of recoveries	3	2	11	4
Ending balance	42	38	42	38
Customer accounts receivable \| Delmarva Power and Light Company [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	24	25	18	22
Current period provision for expected credit losses	0	(5)	7	1
Writeoffs, net of recoveries	2	1	3	4
Ending balance	22	19	22	19
Customer accounts receivable \| Atlantic City Electric Company [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	49	35	49	32
Current period provision for expected credit losses	(1)	1	8	4
Writeoffs, net of recoveries	3	0	12	0
Ending balance	45	36	45	36
Other receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	81	79	72	71
Current period provision for expected credit losses	2	(5)	15	5
Writeoffs, net of recoveries	2	3	6	5
Ending balance	81	71	81	71
Other receivables \| Commonwealth Edison Co [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	20	22	17	21
Current period provision for expected credit losses	(2)	(3)	2	(2)
Writeoffs, net of recoveries	0	1	1	1
Ending balance	18	18	18	18
Other receivables \| PECO Energy Co [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	9	11	7	8
Current period provision for expected credit losses	2	(3)	4	1
Writeoffs, net of recoveries	1	1	1	2
Ending balance	10	7	10	7
Other receivables \| Baltimore Gas and Electric Company [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	11	9	9	9
Current period provision for expected credit losses	1	0	4	1
Writeoffs, net of recoveries	1	1	2	2
Ending balance	11	8	11	8
Other receivables \| Pepco Holdings LLC [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	41	37	39	33
Current period provision for expected credit losses	1	1	5	5
Writeoffs, net of recoveries	0	0	2	0
Ending balance	42	38	42	38
Other receivables \| Potomac Electric Power Company [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	18	15	16	13
Current period provision for expected credit losses	2	1	4	3
Writeoffs, net of recoveries	0	0	0	0
Ending balance	20	16	20	16
Other receivables \| Delmarva Power and Light Company [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	9	10	8	9
Current period provision for expected credit losses	(1)	(1)	0	0
Writeoffs, net of recoveries	0	0	0	0
Ending balance	8	9	8	9
Other receivables \| Atlantic City Electric Company [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	14	12	15	11
Current period provision for expected credit losses	0	1	1	2
Writeoffs, net of recoveries	0	0	2	0
Ending balance	$ 14	$ 13	$ 14	$ 13

Accounts Receivable - Unbilled

Accounts Receivable - Unbilled Customer Revenue (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unbilled customer revenue	$ 636	$ 747
Commonwealth Edison Co [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unbilled customer revenue	191	240
PECO Energy Co [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unbilled customer revenue	138	161
Baltimore Gas and Electric Company [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unbilled customer revenue	123	171
Pepco Holdings LLC [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unbilled customer revenue	184	175
Potomac Electric Power Company [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unbilled customer revenue	94	82
Delmarva Power and Light Company [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unbilled customer revenue	41	53
Atlantic City Electric Company [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unbilled customer revenue	$ 49	$ 40

Accounts Receivable - Purchases

Accounts Receivable - Purchases and Sales of Accounts Receivable (Detail) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable, Purchase	$ 1,911	$ 1,838
Commonwealth Edison Co [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable, Purchase	456	485
PECO Energy Co [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable, Purchase	518	507
Baltimore Gas and Electric Company [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable, Purchase	391	343
Pepco Holdings LLC [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable, Purchase	546	503
Potomac Electric Power Company [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable, Purchase	342	310
Delmarva Power and Light Company [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable, Purchase	104	103
Atlantic City Electric Company [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable, Purchase	100	90
Exelon Generation Co LLC Affiliate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable, Related Parties, Purchase	4	15
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	$ 15

Early Plant Retirements - Narra

Early Plant Retirements - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Property, Plant and Equipment [Line Items]
Cost, Depreciation and Amortization	$ 830	$ 736	$ 1,647	$ 1,494

Early Plant Retirements - Impli

Early Plant Retirements - Implications of Potential Early Plant Retirement on Balance Sheet (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Implications of Potential Early Plant Retirement [Line Items]
Materials and supplies inventory, net	$ 491	$ 476
Property, plant and equipment, net	$ 66,456	$ 64,558

Nuclear Decommissioning - Narra

Nuclear Decommissioning - Narrative (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Nuclear Decommissioning Additional Narrative Information [Line Items]
Increase in PPE related to ARO update	$ (335)	$ 2

Nuclear Decommissioning - Rollf

Nuclear Decommissioning - Rollforward of Nuclear Decommissioning ARO (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Accretion expense	$ 44	$ 255

Asset Impairments - Narrative (

Asset Impairments - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Property, Plant and Equipment [Line Items]
Impairment of Long-Lived Assets Held-for-use			$ 0	$ 500
Net income (loss) attributable to noncontrolling interests	$ 0	$ 75	1	99
Deferred income taxes and amortization of investment tax credits			$ 143	$ (163)

Income Taxes - Narrative (Detai

Income Taxes - Narrative (Details) - USD ($) $ in Millions				6 Months Ended	84 Months Ended
Income Taxes - Narrative (Details) - USD ($) $ in Millions	Jan. 01, 2031	Jan. 01, 2023	Jul. 08, 2022	Jun. 30, 2022	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				31		$ 55
Notes Payable, Current				0		11
Notes Payable, Noncurrent				480		$ 484
Atlantic City Electric Company [Member]
Income Tax Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Assets				179
PECO Energy Co [Member]
Income Tax Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Assets				103
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]
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount				67
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
Effective Income Tax Rate Reconciliation, 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
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent	4.99%	8.99%	9.99%		(0.50%)
Increase (Decrease) in Income Taxes				$ 38

Income Taxes - Reconciliation t

Income Taxes - Reconciliation to Effective Tax Rate (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Effective Income Tax Rate Reconciliation, Percent [Abstract]
U.S. Federal statutory rate	21%	21%	21%	21%
Increase (decrease) due to:
State income taxes, net of Federal income tax benefit	(5.40%)	1.10%	9.90%	2%
Plant basis differences	(3.30%)	(4.00%)	(3.50%)	(3.60%)
Excess deferred tax amortization	(10.50%)	(13.40%)	(11.00%)	(12.50%)
Amortization of investment tax credit, including deferred taxes on basis difference	(0.10%)	(0.10%)	(0.10%)	(0.10%)
Effective Income Tax Rate Reconciliation, Tax Credit, Other, Percent	(0.40%)	(1.00%)	0.80%	(0.50%)
Other	7.70%	(2.70%)	4.70%	(1.60%)
Effective income tax rate	9%	0.90%	21.80%	4.70%
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount			$ 67
Income Tax Credits and Adjustments			15
Total transaction costs relating to the Separation			19
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount	$ 48		48
Federal and State
Increase (decrease) due to:
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount			67
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount			40
Income Tax Credits and Adjustments			17
Current State and Local Tax Expense (Benefit)	43		43
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount	$ 5		$ 4
Commonwealth Edison Co [Member]
Effective Income Tax Rate Reconciliation, Percent [Abstract]
U.S. Federal statutory rate	21%	21%	21%	21%
Increase (decrease) due to:
State income taxes, net of Federal income tax benefit	7.90%	8%	7.90%	7.40%
Plant basis differences	(0.50%)	(0.70%)	(0.50%)	(0.60%)
Excess deferred tax amortization	(5.50%)	(7.00%)	(5.80%)	(7.00%)
Amortization of investment tax credit, including deferred taxes on basis difference	(0.10%)	(0.10%)	(0.10%)	(0.10%)
Effective Income Tax Rate Reconciliation, Tax Credit, Other, Percent	(0.30%)	(0.80%)	(0.30%)	(0.50%)
Other	0%	(1.10%)	0.10%	(2.30%)
Effective income tax rate	22.50%	19.30%	22.30%	17.90%
PECO Energy Co [Member]
Effective Income Tax Rate Reconciliation, Percent [Abstract]
U.S. Federal statutory rate	21%	21%	21%	21%
Increase (decrease) due to:
State income taxes, net of Federal income tax benefit	(0.60%)	(2.90%)	(0.30%)	(2.10%)
Plant basis differences	(11.00%)	(12.50%)	(11.20%)	(11.30%)
Excess deferred tax amortization	(3.10%)	(3.30%)	(3.20%)	(3.30%)
Amortization of investment tax credit, including deferred taxes on basis difference	0%	0%	0%	0%
Effective Income Tax Rate Reconciliation, Tax Credit, Other, Percent	0%	0%	0%	0%
Other	0%	(0.40%)	0.30%	(0.10%)
Effective income tax rate	6.30%	1.90%	6.60%	4.20%
Baltimore Gas and Electric Company [Member]
Effective Income Tax Rate Reconciliation, Percent [Abstract]
U.S. Federal statutory rate	21%	21%	21%	21%
Increase (decrease) due to:
State income taxes, net of Federal income tax benefit	2.10%	(12.50%)	2.30%	(10.50%)
Plant basis differences	(1.30%)	(2.30%)	(1.00%)	(1.60%)
Excess deferred tax amortization	(19.00%)	(17.50%)	(17.80%)	(15.90%)
Amortization of investment tax credit, including deferred taxes on basis difference	(0.10%)	(0.10%)	(0.10%)	(0.10%)
Effective Income Tax Rate Reconciliation, Tax Credit, Other, Percent	(1.50%)	(3.60%)	(0.60%)	(0.90%)
Other	1.40%	(6.60%)	0.30%	(1.00%)
Effective income tax rate	2.60%	(21.60%)	4.10%	(9.00%)
Pepco Holdings LLC [Member]
Effective Income Tax Rate Reconciliation, Percent [Abstract]
U.S. Federal statutory rate	21%	21%	21%	21%
Increase (decrease) due to:
State income taxes, net of Federal income tax benefit	1.50%	2.40%	2.80%	4.20%
Plant basis differences	(1.70%)	(1.10%)	(1.70%)	(1.30%)
Excess deferred tax amortization	(19.20%)	(22.30%)	(18.30%)	(20.80%)
Amortization of investment tax credit, including deferred taxes on basis difference	(0.10%)	(0.10%)	(0.10%)	(0.10%)
Effective Income Tax Rate Reconciliation, Tax Credit, Other, Percent	(0.40%)	(0.80%)	(0.40%)	(0.50%)
Other	(0.10%)	(1.30%)	0.10%	(0.70%)
Effective income tax rate	1%	(2.20%)	3.40%	1.80%
Potomac Electric Power Company [Member]
Effective Income Tax Rate Reconciliation, Percent [Abstract]
U.S. Federal statutory rate	21%	21%	21%	21%
Increase (decrease) due to:
State income taxes, net of Federal income tax benefit	(3.40%)	(2.10%)	(3.80%)	1.50%
Plant basis differences	(2.40%)	(1.50%)	(2.50%)	(1.80%)
Excess deferred tax amortization	(15.70%)	(19.00%)	(16.30%)	(17.20%)
Amortization of investment tax credit, including deferred taxes on basis difference	0%	0%	0%	0%
Effective Income Tax Rate Reconciliation, Tax Credit, Other, Percent	(0.40%)	(0.70%)	(0.40%)	(0.50%)
Other	(0.50%)	(1.90%)	(0.70%)	(0.80%)
Effective income tax rate	(1.40%)	(4.20%)	(2.70%)	2.20%
Delmarva Power and Light Company [Member]
Effective Income Tax Rate Reconciliation, Percent [Abstract]
U.S. Federal statutory rate	21%	21%	21%	21%
Increase (decrease) due to:
State income taxes, net of Federal income tax benefit	7.20%	7%	6.50%	6.60%
Plant basis differences	(0.70%)	(0.70%)	(0.70%)	(0.70%)
Excess deferred tax amortization	(20.00%)	(21.90%)	(19.50%)	(19.70%)
Amortization of investment tax credit, including deferred taxes on basis difference	(0.20%)	(0.20%)	(0.20%)	(0.20%)
Effective Income Tax Rate Reconciliation, Tax Credit, Other, Percent	(0.40%)	(0.90%)	(0.30%)	(0.40%)
Other	1.80%	(1.10%)	0.40%	(0.10%)
Effective income tax rate	8.70%	3.20%	7.20%	6.50%
Atlantic City Electric Company [Member]
Effective Income Tax Rate Reconciliation, Percent [Abstract]
U.S. Federal statutory rate	21%	21%	21%	21%
Increase (decrease) due to:
State income taxes, net of Federal income tax benefit	6.70%	8.10%	6.70%	7.80%
Plant basis differences	(1.00%)	(0.60%)	(1.20%)	(0.70%)
Excess deferred tax amortization	(24.50%)	(28.20%)	(22.90%)	(28.30%)
Amortization of investment tax credit, including deferred taxes on basis difference	(0.20%)	(0.20%)	(0.20%)	(0.20%)
Effective Income Tax Rate Reconciliation, Tax Credit, Other, Percent	(0.40%)	(0.60%)	(0.30%)	(0.50%)
Other	(1.60%)	(2.30%)	(0.50%)	(1.10%)
Effective income tax rate	0%	(2.80%)	2.60%	(2.00%)

Income Taxes - Unrecognized Tax

Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Income Tax Contingency [Line Items]
Unrecognized Tax Benefits	$ 147	$ 143
Income Taxes Receivable, Noncurrent	50
Pepco Holdings LLC [Member]
Income Tax Contingency [Line Items]
Unrecognized Tax Benefits	58	56
Atlantic City Electric Company [Member]
Income Tax Contingency [Line Items]
Unrecognized Tax Benefits	$ 16	$ 16

Retirement Benefits - Narrative

Retirement Benefits - Narrative (Details) - USD ($) $ in Millions	5 Months Ended	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2022	Feb. 01, 2022
Defined Benefit Plan Disclosure [Line Items]
Increase (Decrease) in Obligation, Pension Benefits	$ (921)	$ (24)
Increase (Decrease) in Obligation, Other Postretirement Benefits	(893)	5
Accumulated Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), after Tax	5	5	$ (1,994)
Defined Benefit Plan Amounts Recognized In Regulatory Assets Before Tax	14	(30)
Defined Benefit Plan Amounts Recognized In Regulatory Liabilities Before Tax	$ 5	$ (3)
Pension Plan, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected return on assets		7,000,000%
Discount rate		3,240,000%
Other Postretirement Benefit Plan, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected return on assets		6,440,000%
Discount rate		3,200,000%

Retirement Benefits - Calculati

Retirement Benefits - Calculation of Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Amortization of:
Non-service net periodic benefit cost	$ 16	$ 26	$ 33	$ 46
Pension Plan, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	58	75	119	148
Interest cost	110	101	220	202
Expected return on assets	(205)	(210)	(414)	(421)
Amortization of:
Prior service cost (credit)	1	0	2	1
Actuarial loss	73	99	149	199
Curtailment benefits			0	0
Non-service net periodic benefit cost	37	65	76	129
Other Postretirement Benefit Plan, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	10	13	20	26
Interest cost	19	17	38	35
Expected return on assets	(25)	(25)	(50)	(50)
Amortization of:
Prior service cost (credit)	(5)	(7)	(10)	(13)
Actuarial loss	4	8	8	14
Curtailment benefits			0	(1)
Non-service net periodic benefit cost	$ 3	$ 6	$ 6	$ 11

Retirement Benefits - Allocated

Retirement Benefits - Allocated Portion of Pension and Postretirement Benefit Plan Costs (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Defined Benefit Plan Disclosure [Line Items]
Pension and Other Postretirement Benefits Costs			$ 86	$ 196
Pension and other post retirement benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension and Other Postretirement Benefits Costs	$ 40	$ 71	82	140
Commonwealth Edison Co [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension and Other Postretirement Benefits Costs			30	64
Commonwealth Edison Co [Member] \| Pension and other post retirement benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension and Other Postretirement Benefits Costs	14	32	30	64
PECO Energy Co [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension and Other Postretirement Benefits Costs			(4)	4
PECO Energy Co [Member] \| Pension and other post retirement benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension and Other Postretirement Benefits Costs	(2)	2	(4)	4
Baltimore Gas and Electric Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension and Other Postretirement Benefits Costs			22	29
Baltimore Gas and Electric Company [Member] \| Pension and other post retirement benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension and Other Postretirement Benefits Costs	11	16	22	31
Pepco Holdings LLC [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension and Other Postretirement Benefits Costs			26	24
Pepco Holdings LLC [Member] \| Pension and other post retirement benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension and Other Postretirement Benefits Costs	13	12	26	24
Potomac Electric Power Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension and Other Postretirement Benefits Costs			4	3
Potomac Electric Power Company [Member] \| Pension and other post retirement benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension and Other Postretirement Benefits Costs	2	2	4	3
Delmarva Power and Light Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension and Other Postretirement Benefits Costs			2	1
Delmarva Power and Light Company [Member] \| Pension and other post retirement benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension and Other Postretirement Benefits Costs	1	1	2	1
Atlantic City Electric Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension and Other Postretirement Benefits Costs			6	5
Atlantic City Electric Company [Member] \| Pension and other post retirement benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension and Other Postretirement Benefits Costs	$ 3	$ 3	$ 6	$ 5

Retirement Benefits - Defined C

Retirement Benefits - Defined Contribution Savings Plans (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Defined Benefit Plan Disclosure [Line Items]
Savings Plan Matching Contributions	$ 23	$ 23	$ 43	$ 43
Commonwealth Edison Co [Member]
Defined Benefit Plan Disclosure [Line Items]
Savings Plan Matching Contributions	10	10	18	18
PECO Energy Co [Member]
Defined Benefit Plan Disclosure [Line Items]
Savings Plan Matching Contributions	3	3	6	6
Baltimore Gas and Electric Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Savings Plan Matching Contributions	3	2	5	4
Pepco Holdings LLC [Member]
Defined Benefit Plan Disclosure [Line Items]
Savings Plan Matching Contributions	4	4	7	7
Potomac Electric Power Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Savings Plan Matching Contributions	1	1	2	2
Delmarva Power and Light Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Savings Plan Matching Contributions	1	1	2	2
Atlantic City Electric Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Savings Plan Matching Contributions	$ 1	$ 1	$ 1	$ 1

Derivative Financial Instrume_2

Derivative Financial Instruments - Narrative (Details) MWh in Millions, $ in Millions	1 Months Ended
	Jun. 30, 2012 MWh	Jun. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)
Derivative [Line Items]
Other		$ 1,588	$ 766
Fair Value, Recurring [Member]
Derivative [Line Items]
Derivative Asset		15
Commonwealth Edison Co [Member]
Derivative [Line Items]
Long-term Purchase Commitment, Minimum Energy Volume Required \| MWh	1.3
Other		253	133
Commonwealth Edison Co [Member] \| Fair Value, Recurring [Member]
Derivative [Line Items]
Derivative Asset		15	0
PECO Energy Co [Member]
Derivative [Line Items]
Other		47	35
Incremental Collateral For Loss Of Investment Grade Credit Rating		37
PECO Energy Co [Member] \| Fair Value, Recurring [Member]
Derivative [Line Items]
Derivative Asset		0
Baltimore Gas and Electric Company [Member]
Derivative [Line Items]
Other		224	48
Incremental Collateral For Loss Of Investment Grade Credit Rating		75
Baltimore Gas and Electric Company [Member] \| Fair Value, Recurring [Member]
Derivative [Line Items]
Derivative Asset		0
Delmarva Power and Light Company [Member]
Derivative [Line Items]
Other		239	59
Incremental Collateral For Loss Of Investment Grade Credit Rating		15
Atlantic City Electric Company [Member]
Derivative [Line Items]
Other		149	12
Pepco Holdings LLC [Member]
Derivative [Line Items]
Other		580	171
Potomac Electric Power Company [Member]
Derivative [Line Items]
Other		149	55
Commodity Contract [Member] \| External Counterparties \| Collateral [Member]
Derivative [Line Items]
Other		781
Commodity Contract [Member] \| Commonwealth Edison Co [Member] \| External Counterparties \| Collateral [Member]
Derivative [Line Items]
Other		133	41
Commodity Contract [Member] \| Baltimore Gas and Electric Company [Member] \| External Counterparties \| Collateral [Member]
Derivative [Line Items]
Other		194
Commodity Contract [Member] \| Delmarva Power and Light Company [Member] \| External Counterparties \| Collateral [Member]
Derivative [Line Items]
Other		224	$ 43
Commodity Contract [Member] \| Atlantic City Electric Company [Member] \| External Counterparties \| Collateral [Member]
Derivative [Line Items]
Other		141
Commodity Contract [Member] \| Pepco Holdings LLC [Member] \| External Counterparties \| Collateral [Member]
Derivative [Line Items]
Other		452
Commodity Contract [Member] \| Potomac Electric Power Company [Member] \| External Counterparties \| Collateral [Member]
Derivative [Line Items]
Other		$ 87

Debt and Credit Agreements - Na

Debt and Credit Agreements - Narrative (Details) - Corporate [Member] $ in Millions	6 Months Ended
	Jun. 30, 2022 USD ($)
Debt Instrument [Line Items]
Notes Receivable, Related Parties	$ 319
Proceeds from Sale and Collection of Notes Receivable	258
ShortTermDebt03232017
Short-term Debt [Line Items]
Short-term Bank Loans and Notes Payable	$ 500
ShortTermDebt03232017 \| London Interbank Offered Rate (LIBOR) [Member]
Short-term Debt [Line Items]
Debt Instrument, Interest Rate Terms	SOFR plus 0.65
ShortTermDebt03312021.1
Short-term Debt [Line Items]
Short-term Bank Loans and Notes Payable	$ 150
ShortTermDebt03312021.1 \| London Interbank Offered Rate (LIBOR) [Member]
Short-term Debt [Line Items]
Debt Instrument, Interest Rate Terms	LIBOR plus 0.65
ShortTermDebtSOFRplus0.75Jan2023
Short-term Debt [Line Items]
Short-term Bank Loans and Notes Payable	$ 1,150
ShortTermDebtSOFRplus0.75Jan2023 \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Short-term Debt [Line Items]
Debt Instrument, Interest Rate Terms	SOFR plus 0.75
ShortTermDebtSOFRplus075PLUS22.5BPincreaseJan2023 \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Short-term Debt [Line Items]
Debt Instrument, Interest Rate Terms	22.5

Debt and Credit Agreements - Co

Debt and Credit Agreements - Commercial Paper Borrowings (Details) - Commercial Paper [Member] - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Short-term Debt [Line Items]
Commercial Paper	$ 353	$ 599
Short-term Debt, Weighted Average Interest Rate, at Point in Time	1.86%	0.35%
Corporate [Member]
Short-term Debt [Line Items]
Commercial Paper	$ 100	$ 0
Commonwealth Edison Co [Member]
Short-term Debt [Line Items]
Commercial Paper	0	0
PECO Energy Co [Member]
Short-term Debt [Line Items]
Commercial Paper	$ 210	$ 0
Short-term Debt, Weighted Average Interest Rate, at Point in Time	1.86%	0%
Baltimore Gas and Electric Company [Member]
Short-term Debt [Line Items]
Commercial Paper	$ 0	$ 130
Short-term Debt, Weighted Average Interest Rate, at Point in Time	0%	0.37%
Pepco Holdings LLC [Member]
Short-term Debt [Line Items]
Commercial Paper	$ 43	$ 469
Short-term Debt, Weighted Average Interest Rate, at Point in Time	1.85%	0.35%
Potomac Electric Power Company [Member]
Short-term Debt [Line Items]
Commercial Paper	$ 43	$ 175
Short-term Debt, Weighted Average Interest Rate, at Point in Time	1.85%	0.33%
Delmarva Power and Light Company [Member]
Short-term Debt [Line Items]
Commercial Paper	$ 0	$ 149
Short-term Debt, Weighted Average Interest Rate, at Point in Time	0%	0.36%
Atlantic City Electric Company [Member]
Short-term Debt [Line Items]
Commercial Paper	$ 0	$ 145
Short-term Debt, Weighted Average Interest Rate, at Point in Time	0%	0.35%

Summary of Revolving Credit Agr

Summary of Revolving Credit Agreements (Details) - Revolving Credit Facility [Member] $ in Millions	Jun. 30, 2022 USD ($)
Commonwealth Edison Co [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 1,000
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%
PECO Energy Co [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 600
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%
Baltimore Gas and Electric Company [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 600
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%
Potomac Electric Power Company [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 300
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%
Delmarva Power and Light Company [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 300
Delmarva Power and 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%
Atlantic City Electric Company [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 300
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%
Corporate, Non-Segment [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 900
Corporate, Non-Segment [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 - Is

Debt and Credit Agreements - Issuance of Long-Term Debt (Details) $ in Millions	Jun. 30, 2022 USD ($)
Corporate [Member] \| SMBCTermLoanJuly2023 \| Notes Payable to Banks [Member]
Debt Instrument [Line Items]
Interest Rate	0.65%
Debt Instrument, Face Amount	$ 300
Corporate [Member] \| USBTermLoanJuly2023 \| Notes Payable to Banks [Member]
Debt Instrument [Line Items]
Interest Rate	0.65%
Debt Instrument, Face Amount	$ 300
Corporate [Member] \| PNCTermLoanJuly2023 \| Notes Payable to Banks [Member]
Debt Instrument [Line Items]
Interest Rate	0.65%
Debt Instrument, Face Amount	$ 250
Corporate [Member] \| Notes275Mar2027 \| Notes Payable to Banks [Member]
Debt Instrument [Line Items]
Interest Rate	2.75%
Debt Instrument, Face Amount	$ 650
Corporate [Member] \| Notes335Mar2032 \| Notes Payable to Banks [Member]
Debt Instrument [Line Items]
Interest Rate	3.35%
Debt Instrument, Face Amount	$ 650
Corporate [Member] \| Notes410Mar2052 \| Notes Payable to Banks [Member]
Debt Instrument [Line Items]
Interest Rate	4.10%
Debt Instrument, Face Amount	$ 700
Commonwealth Edison Co [Member] \| FMB315Mar2032 \| First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Interest Rate	3.15%
Debt Instrument, Face Amount	$ 300
Commonwealth Edison Co [Member] \| FMB385Mar2052 \| First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Interest Rate	3.85%
Debt Instrument, Face Amount	$ 450
PECO Energy Co [Member] \| FMB350May2052 \| First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Interest Rate	4.60%
Debt Instrument, Face Amount	$ 350
Baltimore Gas and Electric Company [Member] \| Notes500June2052 \| Notes Payable to Banks [Member]
Debt Instrument [Line Items]
Interest Rate	4.55%
Debt Instrument, Face Amount	$ 500
Potomac Electric Power Company [Member] \| FMB397Mar2052 \| First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Interest Rate	3.97%
Debt Instrument, Face Amount	$ 400
Potomac Electric Power Company [Member] \| FMB336Sept2032 \| First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Interest Rate	3.35%
Debt Instrument, Face Amount	$ 225
Delmarva Power and Light Company [Member] \| Bonds105July2020 [Member] \| First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Interest Rate	3.06%
Debt Instrument, Face Amount	$ 125
Atlantic City Electric Company [Member] \| FMB230Mar2031 \| First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Interest Rate	2.27%
Debt Instrument, Face Amount	$ 25
Atlantic City Electric Company [Member] \| FMB324June2050 [Member] \| First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Interest Rate	3.06%
Debt Instrument, Face Amount	$ 150

Fair Value of Financial Asset_3

Fair Value of Financial Assets and Liabilities - Fair Value of Financial Liabilities Recorded at Amortized Cost (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Long-term debt to financing trust	$ 390	$ 390
Reported Value Measurement [Member]
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Long-term debt (including amounts due within one year)	36,294	32,902
Long-term debt to financing trust	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)	33,275	37,114
Long-term debt to financing trust	398	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 trust	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)	30,960	34,897
Long-term debt to financing trust	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)	2,315	2,217
Long-term debt to financing trust	398	470
Commonwealth Edison Co [Member]
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Long-term debt to financing trust	205	205
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)	10,516	9,773
Long-term debt to financing trust	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)	9,609	11,305
Long-term debt to financing trust	209	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 trust	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)	9,609	11,305
Long-term debt to financing trust	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 trust	209	248
PECO Energy Co [Member]
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Long-term debt to financing trust	184	184
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)	4,192	4,197
Long-term debt to financing trust	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)	3,822	4,790
Long-term debt to financing trust	189	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 trust	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)	3,772	4,740
Long-term debt to financing trust	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 trust	189	222
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)	4,456	3,961
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)	4,096	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)	4,096	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
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)	8,027	7,547
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)	7,118	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)	4,853	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)	2,265	2,167
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)	3,642	3,445
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)	3,569	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)	2,465	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)	1,104	975
Delmarva Power and 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
Delmarva Power and 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)	1,713	1,978
Delmarva Power and 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 and 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)	1,210	1,426
Delmarva Power and 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)	503	552
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
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)	1,612	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)	954	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)	$ 658	$ 641

Fair Value of Financial Asset_4

Fair Value of Financial Assets and Liabilities - Fair Value Measurements of Assets and Liabilities, Recurring and Nonrecurring (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Mark-to-market derivative liabilities (current liabilities)	$ 0	$ 18
Derivative Liability, Noncurrent	103	201
Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash equivalents	1,319	524
Derivative Asset	15
Assets, Fair Value Disclosure	1,554	752
Deferred Compensation Liability, Current and Noncurrent	(73)	(131)
Total Liabilities	(176)	(350)
Fair Value, Net Asset (Liability)	1,378	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	(103)	(219)
Fair Value, Recurring [Member] \| Cash and Cash Equivalents [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash equivalents	177	464
Fair Value, Recurring [Member] \| Restricted cash member [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash equivalents	340	49
Fair Value, Recurring [Member] \| Other Assets [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash equivalents	59	44
Fair Value, Recurring [Member] \| Rabbi Trust Investments [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	220	228
Fair Value, Recurring [Member] \| Cash Equivalents [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	63	60
Fair Value, Recurring [Member] \| Mutual Funds [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	52	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	8	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	97	98
Fair Value, Recurring [Member] \| Economic Hedges [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Derivative Asset	15	0
Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash equivalents	1,319	524
Assets, Fair Value Disclosure	1,434	644
Deferred Compensation Liability, Current and Noncurrent	0	0
Total Liabilities	0	0
Fair Value, Net Asset (Liability)	1,434	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] \| Rabbi Trust Investments [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	115	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	63	60
Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member] \| Mutual Funds [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	52	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] \| Economic Hedges [Member]
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 equivalents	0	0
Assets, Fair Value Disclosure	67	71
Deferred Compensation Liability, Current and Noncurrent	(73)	(131)
Total Liabilities	(73)	(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	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	67	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 Funds [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	8	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	59	61
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	0	0
Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash equivalents	0	0
Assets, Fair Value Disclosure	53	37
Deferred Compensation Liability, Current and Noncurrent	0	0
Total Liabilities	(103)	(219)
Fair Value, Net Asset (Liability)	(50)	(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	(103)	(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	38	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 Funds [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	38	37
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	15	0
Commonwealth Edison Co [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Mark-to-market derivative liabilities (current liabilities)	0	18
Derivative Liability, Noncurrent	103	201
Commonwealth Edison Co [Member] \| Other Assets [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash equivalents		43
Commonwealth Edison Co [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash equivalents	409	237
Derivative Asset	15	0
Assets, Fair Value Disclosure	424	237
Total mark-to-market derivative liabilities	(103)	(219)
Deferred Compensation Liability, Current and Noncurrent	(8)	(10)
Total Liabilities	(111)	(229)
Fair Value, Net Asset (Liability)	313	8
Mark-to-market derivative liabilities (current liabilities)	0	18
Derivative Liability, Noncurrent	(103)	201
Commonwealth Edison Co [Member] \| Fair Value, Recurring [Member] \| Cash and Cash Equivalents [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash equivalents	21	105
Commonwealth Edison Co [Member] \| Fair Value, Recurring [Member] \| Restricted cash member [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash equivalents	133	42
Commonwealth Edison Co [Member] \| Fair Value, Recurring [Member] \| Other Assets [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash equivalents	59
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 Funds [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 equivalents	409	237
Derivative Asset	0
Assets, Fair Value Disclosure	409	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)	409	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 Funds [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 equivalents	0	0
Derivative Asset	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 Funds [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] \| Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash equivalents	0	0
Derivative Asset	15
Assets, Fair Value Disclosure	15	0
Total mark-to-market derivative liabilities	(103)	(219)
Deferred Compensation Liability, Current and Noncurrent	0	0
Total Liabilities	(103)	(219)
Fair Value, Net Asset (Liability)	(88)	(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 Funds [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
PECO Energy Co [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash equivalents	11	9
Derivative Asset	0
Assets, Fair Value Disclosure	36	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)	29	27
PECO Energy Co [Member] \| Fair Value, Recurring [Member] \| Cash and Cash Equivalents [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash equivalents	21	35
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	25	27
PECO Energy Co [Member] \| Fair Value, Recurring [Member] \| Mutual Funds [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	9	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	16	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 equivalents	11	9
Derivative Asset	0
Assets, Fair Value Disclosure	20	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)	20	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	9	11
PECO Energy Co [Member] \| Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member] \| Mutual Funds [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	9	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 equivalents	0	0
Derivative Asset	0
Assets, Fair Value Disclosure	16	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)	9	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	16	16
PECO Energy Co [Member] \| Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member] \| Mutual Funds [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	16	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 equivalents	0	0
Derivative Asset	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 Funds [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
Baltimore Gas and Electric Company [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash equivalents	318	0
Derivative Asset	0
Assets, Fair Value Disclosure	325	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)	321	7
Baltimore Gas and Electric Company [Member] \| Fair Value, Recurring [Member] \| Cash and Cash Equivalents [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash equivalents	36	51
Baltimore Gas and Electric Company [Member] \| Fair Value, Recurring [Member] \| Restricted cash member [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash equivalents	205	4
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 Funds [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 equivalents	318	0
Derivative Asset	0
Assets, Fair Value Disclosure	325	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)	325	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 Funds [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 equivalents	0	0
Derivative Asset	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 Funds [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 equivalents	0	0
Derivative Asset	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 Funds [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
Pepco Holdings LLC [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash equivalents	557	110
Assets, Fair Value Disclosure	695	255
Deferred Compensation Liability, Current and Noncurrent	(14)	(18)
Total Liabilities	(14)	(18)
Fair Value, Net Asset (Liability)	681	237
Pepco Holdings LLC [Member] \| Fair Value, Recurring [Member] \| Cash and Cash Equivalents [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash equivalents	60	100
Pepco Holdings LLC [Member] \| Fair Value, Recurring [Member] \| Restricted cash member [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash equivalents	2	3
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	60	59
Pepco Holdings LLC [Member] \| Fair Value, Recurring [Member] \| Mutual Funds [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	8	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	59	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 equivalents	557	110
Assets, Fair Value Disclosure	628	183
Deferred Compensation Liability, Current and Noncurrent	0	0
Total Liabilities	0	0
Fair Value, Net Asset (Liability)	628	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	71	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	60	59
Pepco Holdings LLC [Member] \| Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member] \| Mutual Funds [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 equivalents	0	0
Assets, Fair Value Disclosure	30	37
Deferred Compensation Liability, Current and Noncurrent	(14)	(18)
Total Liabilities	(14)	(18)
Fair Value, Net Asset (Liability)	16	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	30	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 Funds [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	8	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 equivalents	0	0
Assets, Fair Value Disclosure	37	35
Deferred Compensation Liability, Current and Noncurrent	0	0
Total Liabilities	0	0
Fair Value, Net Asset (Liability)	37	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	37	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 Funds [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	37	35
Potomac Electric Power Company [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash equivalents	115	31
Assets, Fair Value Disclosure	233	151
Deferred Compensation Liability, Current and Noncurrent	(1)	(2)
Total Liabilities	(1)	(2)
Fair Value, Net Asset (Liability)	232	149
Potomac Electric Power Company [Member] \| Fair Value, Recurring [Member] \| Cash and Cash Equivalents [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash equivalents	14	34
Potomac Electric Power Company [Member] \| Fair Value, Recurring [Member] \| Restricted cash member [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash equivalents	2	3
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	118	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	59	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 equivalents	115	31
Assets, Fair Value Disclosure	174	89
Deferred Compensation Liability, Current and Noncurrent	0	0
Total Liabilities	0	0
Fair Value, Net Asset (Liability)	174	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 equivalents	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 equivalents	0	0
Assets, Fair Value Disclosure	37	35
Deferred Compensation Liability, Current and Noncurrent	0	0
Total Liabilities	0	0
Fair Value, Net Asset (Liability)	37	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	37	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	37	35
Delmarva Power and Light Company [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash equivalents	223	43
Assets, Fair Value Disclosure	223	43
Deferred Compensation Liability, Current and Noncurrent	0	0
Total Liabilities	0	0
Fair Value, Net Asset (Liability)	223	43
Delmarva Power and Light Company [Member] \| Fair Value, Recurring [Member] \| Cash and Cash Equivalents [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash equivalents	26	28
Delmarva Power and 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 and 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 and 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 and 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 equivalents	223	43
Assets, Fair Value Disclosure	223	43
Deferred Compensation Liability, Current and Noncurrent	0	0
Total Liabilities	0	0
Fair Value, Net Asset (Liability)	223	43
Delmarva Power and 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 and 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 and 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 and 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 equivalents	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 and 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 and 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 and 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 and 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 equivalents	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 and 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 and 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 and 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
Atlantic City Electric Company [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash equivalents	218	0
Assets, Fair Value Disclosure	218	0
Deferred Compensation Liability, Current and Noncurrent	0	0
Total Liabilities	0	0
Fair Value, Net Asset (Liability)	218	0
Atlantic City Electric Company [Member] \| Fair Value, Recurring [Member] \| Cash and Cash Equivalents [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash equivalents	15	29
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 equivalents	218	0
Assets, Fair Value Disclosure	218	0
Deferred Compensation Liability, Current and Noncurrent	0	0
Total Liabilities	0	0
Fair Value, Net Asset (Liability)	218	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 equivalents	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 equivalents	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

Fair Value of Financial Asset_5

Fair Value of Financial Assets and Liabilities - Fair Value Assets Liabilities Measured On Recurring Basis Unobservable Input Reconciliation (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Fair Value, Inputs, Level 3 [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning Balance	$ (107)	$ (260)	$ (182)	$ (267)
Total realized / unrealized gains (losses)
Included in net income(a)	1	1	2	2
Included in regulatory assets	56	30	131	36
Purchases, sales, issuances and settlements
Settlements		(2)		(2)
Transfers out of Level 3			(1)
Ending Balance	(50)	(231)	(50)	(231)
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss)	1	1	2	2
Commonwealth Edison Co [Member] \| Derivative [Member] \| Interest Rate Swap [Member]
Footnotes To Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Abstract]
Realized Investment Gains (Losses)	(3)	5	3	13
Commonwealth Edison Co [Member] \| Fair Value, Inputs, Level 3 [Member] \| Derivative [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning Balance	(144)	(295)	(219)	(301)
Total realized / unrealized gains (losses)
Included in net income(a)	0	0	0	0
Included in regulatory assets	56	30	131	36
Purchases, sales, issuances and settlements
Settlements		0		0
Transfers out of Level 3			0
Ending Balance	(88)	(265)	(88)	(265)
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss)	0	0	0	0
Footnotes To Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Abstract]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Period Increase (Decrease)	(59)	(25)	(128)	(23)
Pepco Holdings LLC [Member] \| Fair Value, Inputs, Level 3 [Member] \| 6311 Life Insurance [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning Balance	36	35	35	34
Total realized / unrealized gains (losses)
Included in net income(a)	1	1	2	2
Included in regulatory assets	0	0	0	0
Purchases, sales, issuances and settlements
Settlements		(2)		(2)
Transfers out of Level 3			0
Ending Balance	37	34	37	34
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss)	1	1	2	2
Potomac Electric Power Company [Member] \| Fair Value, Inputs, Level 3 [Member] \| 6311 Life Insurance [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning Balance	36	35	35	34
Total realized / unrealized gains (losses)
Included in net income(a)	1	1	2	2
Included in regulatory assets	0	0	0	0
Purchases, sales, issuances and settlements
Settlements		(2)		(2)
Transfers out of Level 3			0
Ending Balance	37	34	37	34
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss)	$ 1	$ 1	$ 2	$ 2

Fair Value of Financial Asset_6

Fair Value of Financial Assets and Liabilities - Fair Value Assets And Liabilities Measured On Recurring Basis Gain Loss Included In Earnings (Details) - Fair Value, Inputs, Level 3 [Member] - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Fair Value Assets And Liabilities Measured On Recurring Basis Gain Loss Included In Earnings [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	$ (1)	$ (1)	$ (2)	$ (2)
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss)	$ 1	$ 1	$ 2	$ 2

Fair Value of Financial Asset_7

Fair Value of Financial Assets and Liabilities - Fair Value Inputs Assets Quantitative Information (Details) - Fair Value, Inputs, Level 3 [Member] - Derivative [Member] - USD ($)	Jun. 30, 2022	Dec. 31, 2021
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	$ (88,000,000)	$ (219,000,000)
Discounted Cash Flow [Member] \| Minimum [Member]
Derivatives Fair Value Footnotes [Abstract]
Fair Value Inputs Forward Power Price	30.54	28.65
Discounted Cash Flow [Member] \| Maximum [Member]
Derivatives Fair Value Footnotes [Abstract]
Fair Value Inputs Forward Power Price	89.78	47.10
Discounted Cash Flow [Member] \| Arithmetic Average [Member]
Derivatives Fair Value Footnotes [Abstract]
Fair Value Inputs Forward Power Price	46.33	33.96
Commonwealth Edison Co [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	$ (88,000,000)	$ (219,000,000)
Commonwealth Edison Co [Member] \| Discounted Cash Flow [Member] \| Minimum [Member]
Derivatives Fair Value Footnotes [Abstract]
Fair Value Inputs Forward Power Price	30.54	28.65
Commonwealth Edison Co [Member] \| Discounted Cash Flow [Member] \| Maximum [Member]
Derivatives Fair Value Footnotes [Abstract]
Fair Value Inputs Forward Power Price	89.78	47.10
Commonwealth Edison Co [Member] \| Discounted Cash Flow [Member] \| Arithmetic Average [Member]
Derivatives Fair Value Footnotes [Abstract]
Fair Value Inputs Forward Power Price	46.33	33.96

Commitments and Contingencies -

Commitments and Contingencies - Narrative (Details) $ in Millions		1 Months Ended	12 Months Ended
	Mar. 23, 2016 MW	Nov. 30, 2020 USD ($)	Dec. 31, 2022 MW	Dec. 31, 2018 MW	Dec. 31, 2017 MW	Jun. 30, 2022 USD ($) MGPSite	Dec. 31, 2021 USD ($)
Commitments And Contingencies Additional Narrative Information [Line Items]
Other Commitment						$ 610
Accrual for Environmental Loss Contingencies, Gross						347	$ 352
Commonwealth Edison Co [Member]
Commitments And Contingencies Additional Narrative Information [Line Items]
Other Commitment						$ 226
Mgp Site Contingency Monitoring Count \| MGPSite						21
Accrual for Environmental Loss Contingencies, Gross						$ 274	279
Deferred Prosecution Agreement Payments		$ 200
Customer Refund Liability, Noncurrent						38
PECO Energy Co [Member]
Commitments And Contingencies Additional Narrative Information [Line Items]
Other Commitment						$ 182
Mgp Site Contingency Monitoring Count \| MGPSite						6
Accrual for Environmental Loss Contingencies, Gross						$ 21	22
Baltimore Gas and Electric Company [Member]
Commitments And Contingencies Additional Narrative Information [Line Items]
Other Commitment						$ 4
Mgp Site Contingency Monitoring Count \| MGPSite						4
Accrual for Environmental Loss Contingencies, Gross						$ 7	6
Pepco Holdings LLC [Member]
Commitments And Contingencies Additional Narrative Information [Line Items]
Other Commitment						125
Accrual for Environmental Loss Contingencies, Gross						42	42
Potomac Electric Power Company [Member]
Commitments And Contingencies Additional Narrative Information [Line Items]
Other Commitment						94
Accrual for Environmental Loss Contingencies, Gross						40	40
Delmarva Power and Light Company [Member]
Commitments And Contingencies Additional Narrative Information [Line Items]
Other Commitment						$ 20
Mgp Site Contingency Count \| MGPSite						1
Accrual for Environmental Loss Contingencies, Gross						$ 1	$ 1
Pepco Holdings Inc [Member]
Commitments And Contingencies Additional Narrative Information [Line Items]
Other Commitment						513
Pepco Holdings Inc [Member] \| Pepco Holdings LLC [Member]
Commitments And Contingencies Additional Narrative Information [Line Items]
Other Commitment						320
Pepco Holdings Inc [Member] \| Potomac Electric Power Company [Member]
Commitments And Contingencies Additional Narrative Information [Line Items]
Other Commitment						120
Pepco Holdings Inc [Member] \| Delmarva Power and Light Company [Member]
Commitments And Contingencies Additional Narrative Information [Line Items]
Other Commitment						$ 89
Wind Assets [Member] \| Pepco Holdings Inc [Member] \| Delmarva Power and Light Company [Member]
Commitments And Contingencies Additional Narrative Information [Line Items]
Purchase Commitment \| MW	120			40	40
Wind Assets [Member] \| Pepco Holdings Inc [Member] \| Delmarva Power and Light Company [Member] \| Forecast [Member]
Commitments And Contingencies Additional Narrative Information [Line Items]
Purchase Commitment \| MW			40

Commitments and Contingencies_3

Commitments and Contingencies - Merger Commitment (Details) $ in Millions	Jun. 30, 2022 USD ($)
Other Commitments [Line Items]
Other Commitment	$ 610
Pepco Holdings LLC [Member]
Other Commitments [Line Items]
Other Commitment	125
Potomac Electric Power Company [Member]
Other Commitments [Line Items]
Other Commitment	94
Delmarva Power and Light Company [Member]
Other Commitments [Line Items]
Other Commitment	20
Atlantic City Electric Company [Member]
Other Commitments [Line Items]
Other Commitment	11
Pepco Holdings Inc [Member]
Other Commitments [Line Items]
Other Commitment	513
Pepco Holdings Inc [Member] \| Remaining commitment
Other Commitments [Line Items]
Other Commitment	61
Pepco Holdings Inc [Member] \| Pepco Holdings LLC [Member]
Other Commitments [Line Items]
Other Commitment	320
Pepco Holdings Inc [Member] \| Pepco Holdings LLC [Member] \| Remaining commitment
Other Commitments [Line Items]
Other Commitment	53
Pepco Holdings Inc [Member] \| Potomac Electric Power Company [Member]
Other Commitments [Line Items]
Other Commitment	120
Pepco Holdings Inc [Member] \| Potomac Electric Power Company [Member] \| Remaining commitment
Other Commitments [Line Items]
Other Commitment	44
Pepco Holdings Inc [Member] \| Delmarva Power and Light Company [Member]
Other Commitments [Line Items]
Other Commitment	89
Pepco Holdings Inc [Member] \| Delmarva Power and Light Company [Member] \| Remaining commitment
Other Commitments [Line Items]
Other Commitment	6
Pepco Holdings Inc [Member] \| Atlantic City Electric Company [Member]
Other Commitments [Line Items]
Other Commitment	111
Pepco Holdings Inc [Member] \| Atlantic City Electric Company [Member] \| Remaining commitment
Other Commitments [Line Items]
Other Commitment	$ 3

Commitments and Contingencies_4

Commitments and Contingencies - Schedule of Commercial Commitments (Details) $ in Millions	Jun. 30, 2022 USD ($)
Other Commitments [Line Items]
Other Commitment	$ 610
Other Commitment, to be Paid, Remainder of Fiscal Year	152
Other Commitment, to be Paid, Year One	50
Other Commitment, to be Paid, Year Two	8
Other Commitment, to be Paid, Year Three	6
Other Commitment, to be Paid, Year Four	5
Other Commitment, to be Paid, Year Five and Beyond	389
Guarantor Obligations, Maximum Exposure, Undiscounted	74
Letters of Credit
Other Commitments [Line Items]
Other Commitment	17
Other Commitment, to be Paid, Remainder of Fiscal Year	8
Other Commitment, to be Paid, Year One	9
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 and Beyond	0
Surety Bonds
Other Commitments [Line Items]
Other Commitment	185
Other Commitment, to be Paid, Remainder of Fiscal Year	144
Other Commitment, to be Paid, Year One	39
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 and Beyond	0
Financing trust guarantees
Other Commitments [Line Items]
Other Commitment	378
Other Commitment, to be Paid, Remainder of Fiscal Year	0
Other Commitment, to be Paid, Year One	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 and Beyond	378
Guaranteed lease residual values
Other Commitments [Line Items]
Other Commitment	30
Other Commitment, to be Paid, Remainder of Fiscal Year	0
Other Commitment, to be Paid, Year One	2
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 and Beyond	11
Commonwealth Edison Co [Member]
Other Commitments [Line Items]
Other Commitment	226
Other Commitment, to be Paid, Remainder of Fiscal Year	13
Other Commitment, to be Paid, Year One	11
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 and Beyond	200
Commonwealth Edison Co [Member] \| Letters of Credit
Other Commitments [Line Items]
Other Commitment	10
Other Commitment, to be Paid, Remainder of Fiscal Year	4
Other Commitment, to be Paid, Year One	6
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 and Beyond	0
Commonwealth Edison Co [Member] \| Surety Bonds
Other Commitments [Line Items]
Other Commitment	16
Other Commitment, to be Paid, Remainder of Fiscal Year	9
Other Commitment, to be Paid, Year One	5
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 and Beyond	0
Commonwealth Edison Co [Member] \| Financing trust guarantees
Other Commitments [Line Items]
Other Commitment	200
Other Commitment, to be Paid, Remainder of Fiscal Year	0
Other Commitment, to be Paid, Year One	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 and Beyond	200
PECO Energy Co [Member]
Other Commitments [Line Items]
Other Commitment	182
Other Commitment, to be Paid, Remainder of Fiscal Year	1
Other Commitment, to be Paid, Year One	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 and Beyond	178
PECO Energy Co [Member] \| Surety Bonds
Other Commitments [Line Items]
Other Commitment	3
Other Commitment, to be Paid, Remainder of Fiscal Year	1
Other Commitment, to be Paid, Year One	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 and Beyond	0
PECO Energy Co [Member] \| Financing trust guarantees
Other Commitments [Line Items]
Other Commitment	178
Other Commitment, to be Paid, Remainder of Fiscal Year	0
Other Commitment, to be Paid, Year One	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 and Beyond	178
PECO Energy Co [Member] \| Standby Letters of Credit
Other Commitments [Line Items]
Other Commitment	1
Other Commitment, to be Paid, Remainder of Fiscal Year	0
Other Commitment, to be Paid, Year One	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, after Year Five	0
Baltimore Gas and Electric Company [Member]
Other Commitments [Line Items]
Other Commitment	4
Other Commitment, to be Paid, Remainder of Fiscal Year	3
Other Commitment, to be Paid, Year One	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 and Beyond	0
Baltimore Gas and Electric Company [Member] \| Letters of Credit
Other Commitments [Line Items]
Other Commitment	2
Other Commitment, to be Paid, Remainder of Fiscal Year	2
Other Commitment, to be Paid, Year One	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 and Beyond	0
Baltimore Gas and Electric Company [Member] \| Surety Bonds
Other Commitments [Line Items]
Other Commitment	2
Other Commitment, to be Paid, Remainder of Fiscal Year	1
Other Commitment, to be Paid, Year One	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 and Beyond	0
Pepco Holdings LLC [Member]
Other Commitments [Line Items]
Other Commitment	125
Other Commitment, to be Paid, Remainder of Fiscal Year	76
Other Commitment, to be Paid, Year One	21
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 and Beyond	11
Guarantor Obligations, Maximum Exposure, Undiscounted	74
Pepco Holdings LLC [Member] \| Surety Bonds
Other Commitments [Line Items]
Other Commitment	95
Other Commitment, to be Paid, Remainder of Fiscal Year	76
Other Commitment, to be Paid, Year One	19
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 and Beyond	0
Pepco Holdings LLC [Member] \| Guaranteed lease residual values
Other Commitments [Line Items]
Other Commitment	30
Other Commitment, to be Paid, Remainder of Fiscal Year	0
Other Commitment, to be Paid, Year One	2
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 and Beyond	11
Potomac Electric Power Company [Member]
Other Commitments [Line Items]
Other Commitment	94
Other Commitment, to be Paid, Remainder of Fiscal Year	71
Other Commitment, to be Paid, Year One	14
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 and Beyond	3
Guarantor Obligations, Maximum Exposure, Undiscounted	24
Potomac Electric Power Company [Member] \| Surety Bonds
Other Commitments [Line Items]
Other Commitment	84
Other Commitment, to be Paid, Remainder of Fiscal Year	71
Other Commitment, to be Paid, Year One	13
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 and Beyond	0
Potomac Electric Power Company [Member] \| Guaranteed lease residual values
Other Commitments [Line Items]
Other Commitment	10
Other Commitment, to be Paid, Remainder of Fiscal Year	0
Other Commitment, to be Paid, Year One	1
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 and Beyond	3
Delmarva Power and Light Company [Member]
Other Commitments [Line Items]
Other Commitment	20
Other Commitment, to be Paid, Remainder of Fiscal Year	3
Other Commitment, to be Paid, Year One	4
Other Commitment, to be Paid, Year Two	3
Other Commitment, to be Paid, Year Three	3
Other Commitment, to be Paid, Year Four	2
Other Commitment, to be Paid, Year Five and Beyond	5
Guarantor Obligations, Maximum Exposure, Undiscounted	31
Delmarva Power and Light Company [Member] \| Surety Bonds
Other Commitments [Line Items]
Other Commitment	7
Other Commitment, to be Paid, Remainder of Fiscal Year	3
Other Commitment, to be Paid, Year One	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 and Beyond	0
Delmarva Power and Light Company [Member] \| Guaranteed lease residual values
Other Commitments [Line Items]
Other Commitment	13
Other Commitment, to be Paid, Remainder of Fiscal Year	0
Other Commitment, to be Paid, Year One	0
Other Commitment, to be Paid, Year Two	3
Other Commitment, to be Paid, Year Three	3
Other Commitment, to be Paid, Year Four	2
Other Commitment, to be Paid, Year Five and Beyond	5
Atlantic City Electric Company [Member]
Other Commitments [Line Items]
Other Commitment	11
Other Commitment, to be Paid, Remainder of Fiscal Year	2
Other Commitment, to be Paid, Year One	3
Other Commitment, to be Paid, Year Two	1
Other Commitment, to be Paid, Year Three	1
Other Commitment, to be Paid, Year Four	1
Other Commitment, to be Paid, Year Five and Beyond	3
Guarantor Obligations, Maximum Exposure, Undiscounted	19
Atlantic City Electric Company [Member] \| Surety Bonds
Other Commitments [Line Items]
Other Commitment	4
Other Commitment, to be Paid, Remainder of Fiscal Year	2
Other Commitment, to be Paid, Year One	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 and Beyond	0
Atlantic City Electric Company [Member] \| Guaranteed lease residual values
Other Commitments [Line Items]
Other Commitment	7
Other Commitment, to be Paid, Remainder of Fiscal Year	0
Other Commitment, to be Paid, Year One	1
Other Commitment, to be Paid, Year Two	1
Other Commitment, to be Paid, Year Three	1
Other Commitment, to be Paid, Year Four	1
Other Commitment, to be Paid, Year Five and Beyond	$ 3
Minimum [Member] \| Guaranteed lease residual values
Other Commitments [Line Items]
Lessor, Operating Lease, Term of Contract	1 year
Maximum [Member] \| Guaranteed lease residual values
Other Commitments [Line Items]
Lessor, Operating Lease, Term of Contract	8 years

Commitments and Contingencies_5

Commitments and Contingencies - Schedule of Accruals for Environmental Matters (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Site Contingency [Line Items]
Total environmental investigation and remediation reserve	$ 347	$ 352
Commonwealth Edison Co [Member]
Site Contingency [Line Items]
Total environmental investigation and remediation reserve	274	279
PECO Energy Co [Member]
Site Contingency [Line Items]
Total environmental investigation and remediation reserve	21	22
Baltimore Gas and Electric Company [Member]
Site Contingency [Line Items]
Total environmental investigation and remediation reserve	7	6
Pepco Holdings LLC [Member]
Site Contingency [Line Items]
Total environmental investigation and remediation reserve	42	42
Potomac Electric Power Company [Member]
Site Contingency [Line Items]
Total environmental investigation and remediation reserve	40	40
Delmarva Power and Light Company [Member]
Site Contingency [Line Items]
Total environmental investigation and remediation reserve	1	1
Atlantic City Electric Company [Member]
Site Contingency [Line Items]
Total environmental investigation and remediation reserve	1	1
Accrual For MGP Investigation And Remediation [Member]
Site Contingency [Line Items]
Total environmental investigation and remediation reserve	299	303
Accrual For MGP Investigation And Remediation [Member] \| Commonwealth Edison Co [Member]
Site Contingency [Line Items]
Total environmental investigation and remediation reserve	273	279
Accrual For MGP Investigation And Remediation [Member] \| PECO Energy Co [Member]
Site Contingency [Line Items]
Total environmental investigation and remediation reserve	20	20
Accrual For MGP Investigation And Remediation [Member] \| Baltimore Gas and Electric Company [Member]
Site Contingency [Line Items]
Total environmental investigation and remediation reserve	6	4
Accrual For MGP Investigation And Remediation [Member] \| Pepco Holdings LLC [Member]
Site Contingency [Line Items]
Total environmental investigation and remediation reserve	0	0
Accrual For MGP Investigation And Remediation [Member] \| Potomac Electric Power Company [Member]
Site Contingency [Line Items]
Total environmental investigation and remediation reserve	0	0
Accrual For MGP Investigation And Remediation [Member] \| Delmarva Power and Light Company [Member]
Site Contingency [Line Items]
Total environmental investigation and remediation reserve	0	0
Accrual For MGP Investigation And Remediation [Member] \| Atlantic City Electric Company [Member]
Site Contingency [Line Items]
Total environmental investigation and remediation reserve	$ 0	$ 0

Changes in Accumulated Other _3

Changes in Accumulated Other Comprehensive Income - Schedule of Changes in AOCI (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021
Movement in Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	$ 23,491	$ 34,795	$ 34,313	$ 34,868	$ 34,795	$ 34,868
Other comprehensive income (loss), net of income taxes	12	14	57	54	26	111
Ending balance	23,656	23,491	34,500	34,313	23,656	34,500
Gains (Losses) on Cash Flow Hedges
Movement in Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	0	(6)	(5)	(5)	(6)	(5)
OCI before reclassifications	0		0		0	0
Amounts reclassified from AOCI	0		0		0	0
Other comprehensive income (loss), net of income taxes	0		0		0	0
Ending balance	0	0	(5)	(5)	0	(5)
Gains (Losses) on Cash Flow Hedges \| Exelon Generation Co L L C [Member]
Movement in Accumulated Other Comprehensive Income [Roll Forward]
Other comprehensive income (loss), net of income taxes					6
Pension and Non-Pension Postretirement Benefit Plan Items
Movement in Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(713)	(2,721)	(3,319)	(3,372)	(2,721)	(3,372)
OCI before reclassifications	2		0		2	(2)
Amounts reclassified from AOCI	10		55		24	110
Other comprehensive income (loss), net of income taxes	12		55		26	108
Ending balance	(701)	(713)	(3,264)	(3,319)	(701)	(3,264)
Pension and Non-Pension Postretirement Benefit Plan Items \| Exelon Generation Co L L C [Member]
Movement in Accumulated Other Comprehensive Income [Roll Forward]
Other comprehensive income (loss), net of income taxes					1,994
Foreign Currency Items
Movement in Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	0	(23)	(22)	(23)	(23)	(23)
OCI before reclassifications	0		2		0	3
Amounts reclassified from AOCI	0		0		0	0
Other comprehensive income (loss), net of income taxes	0		2		0	3
Ending balance	0	0	(20)	(22)	0	(20)
Foreign Currency Items \| Exelon Generation Co L L C [Member]
Movement in Accumulated Other Comprehensive Income [Roll Forward]
Other comprehensive income (loss), net of income taxes					23
Total
Movement in Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(713)	(2,750)	(3,346)	(3,400)	(2,750)	(3,400)
OCI before reclassifications	2		2		2	1
Amounts reclassified from AOCI	10		55		24	110
Other comprehensive income (loss), net of income taxes	12	14	57	54	26	111
Ending balance	$ (701)	$ (713)	$ (3,289)	$ (3,346)	(701)	$ (3,289)
Total \| Exelon Generation Co L L C [Member]
Movement in Accumulated Other Comprehensive Income [Roll Forward]
Other comprehensive income (loss), net of income taxes					$ 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	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Prior service costs
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), Tax	$ 0	$ 1	$ 0	$ 2
Actuarial losses
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), Tax	(3)	(19)	(8)	(38)
Pension and Non-Pension Postretirement Benefit Plan Items
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), Tax	$ (1)	$ (1)	$ 0	$ (1)

Variable Interest Entities - Na

Variable Interest Entities - Narrative (Details) $ in Millions	Jun. 30, 2022 USD ($)
Variable Interest Entity [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	$ 74

Variable Interest Entities - As

Variable Interest Entities - Assets and Liabilities of Consolidated VIES (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021	Jun. 30, 2021	Dec. 31, 2020
Variable Interest Entity [Line Items]
Cash and cash equivalents	$ 816	$ 672	$ 1,578	$ 432
Restricted cash and cash equivalents	961	321	379	349
Accounts receivable, net
Customer	1,865	1,869
Inventory, net
Materials and supplies	491	476
Current assets of discontinued operations	0	7,835
Other current assets	515	387
Total current assets	7,342	13,957
Property, plant and equipment, net	66,456	64,558
Other Assets, Noncurrent	1,017	885
Assets	92,295	133,013
Long-term debt due within one year	505	2,153
Accounts payable	2,451	2,379
Accrued expenses	1,057	1,137
Unamortized energy contract liabilities	11	89
Current liabilities of discontinued operations	0	7,940
Other	1,588	766
Total current liabilities	8,031	16,111
Long-term debt	35,789	30,749
Asset retirement obligations, noncurrent	275	271
Unamortized energy contract liabilities	38	146
Other	2,054	1,573
Liabilities	68,639	98,218
Pepco Holdings LLC [Member]
Variable Interest Entity [Line Items]
Cash and cash equivalents	278	136	61	111
Restricted cash and cash equivalents	341	77	42	39
Accounts receivable, net
Customer	567	512
Inventory, net
Materials and supplies	217	209
Other current assets	90	69
Total current assets	2,188	1,692
Property, plant and equipment, net	16,915	16,498
Other Assets, Noncurrent	245	258
Assets	25,592	24,744
Long-term debt due within one year	200	399
Accounts payable	574	578
Accrued expenses	246	281
Unamortized energy contract liabilities	11	89
Other	580	171
Total current liabilities	1,967	2,246
Long-term debt	7,827	7,148
Asset retirement obligations, noncurrent	70	70
Unamortized energy contract liabilities	38	146
Other	615	570
Liabilities	14,468	14,159
Atlantic City Electric Company [Member]
Variable Interest Entity [Line Items]
Cash and cash equivalents	233	29	11	17
Restricted cash and cash equivalents	0	0	$ 3	$ 3
Accounts receivable, net
Customer	149	141
Inventory, net
Other current assets	7	3
Total current assets	659	333
Property, plant and equipment, net	3,798	3,729
Other Assets, Noncurrent	34	37
Assets	5,052	4,556
Long-term debt due within one year	3	3
Accounts payable	157	165
Accrued expenses	43	44
Other	149	12
Total current liabilities	506	445
Long-term debt	1,754	1,579
Other	143	49
Liabilities	$ 3,305	$ 2,981

Variable Interest Entities - Su

Variable Interest Entities - Summary of Significant Unconsolidated VIEs (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Variable Interest Entity [Line Items]
Total assets	$ 92,295	$ 133,013
Total liabilities	$ 68,639	$ 98,218

Supplemental Financial Inform_3

Supplemental Financial Information - Operations (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Other, Net [Abstract]
AFUDC - Equity	$ 38	$ 34	$ 74	$ 64
Non-service net periodic benefit cost	16	26	33	46
Commonwealth Edison Co [Member]
Other, Net [Abstract]
AFUDC - Equity	9	9	17	13
Non-service net periodic benefit cost	0	0	0	0
PECO Energy Co [Member]
Other, Net [Abstract]
AFUDC - Equity	8	6	15	12
Non-service net periodic benefit cost	0	0	0	0
Baltimore Gas and Electric Company [Member]
Other, Net [Abstract]
AFUDC - Equity	6	7	12	14
Non-service net periodic benefit cost	0	0	0	0
Pepco Holdings LLC [Member]
Other, Net [Abstract]
AFUDC - Equity	15	12	30	25
Non-service net periodic benefit cost	0	0	0	0
Potomac Electric Power Company [Member]
Other, Net [Abstract]
AFUDC - Equity	11	10	22	20
Non-service net periodic benefit cost	0	0	0	0
Delmarva Power and Light Company [Member]
Other, Net [Abstract]
AFUDC - Equity	2	1	4	3
Non-service net periodic benefit cost	0	0	0	0
Atlantic City Electric Company [Member]
Other, Net [Abstract]
AFUDC - Equity	2	1	4	2
Non-service net periodic benefit cost	$ 0	$ 0	$ 0	$ 0

Supplemental Financial Inform_4

Supplemental Financial Information - Taxes Other Than Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Supplemental Statement of Operations Information [Line Items]
Utility taxes	$ 203	$ 184	$ 424	$ 377
Property	94	86	188	173
Payroll	28	32	64	64
Commonwealth Edison Co [Member]
Supplemental Statement of Operations Information [Line Items]
Utility taxes	71	61	149	121
Property	10	8	20	16
Payroll	7	6	13	13
PECO Energy Co [Member]
Supplemental Statement of Operations Information [Line Items]
Utility taxes	39	32	77	66
Property	4	4	9	9
Payroll	5	4	8	8
Baltimore Gas and Electric Company [Member]
Supplemental Statement of Operations Information [Line Items]
Utility taxes	20	20	47	45
Property	46	43	92	85
Payroll	4	5	9	9
Pepco Holdings LLC [Member]
Supplemental Statement of Operations Information [Line Items]
Utility taxes	73	71	151	145
Property	33	31	67	63
Payroll	7	7	14	14
Potomac Electric Power Company [Member]
Supplemental Statement of Operations Information [Line Items]
Utility taxes	67	65	137	132
Property	23	20	46	42
Payroll	1	1	3	3
Delmarva Power and Light Company [Member]
Supplemental Statement of Operations Information [Line Items]
Utility taxes	5	5	12	11
Property	10	10	20	19
Payroll	1	1	2	3
Atlantic City Electric Company [Member]
Supplemental Statement of Operations Information [Line Items]
Utility taxes	1	0	2	1
Property	0	1	1	1
Payroll	$ 1	$ 1	$ 2	$ 2

Supplemental Financial Inform_5

Supplemental Financial Information - Cash Flow (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Depreciation, Amortization and Accretion [Abstract]
Property, plant and equipment			$ 1,376	$ 3,043
Amortization of regulatory assets			357	291
Amortization of intangible assets, net			8	29
Amortization of energy contract assets and liabilities			3	13
Nuclear fuel			66	549
ARO accretion			44	255
Depreciation, Amortization and Accretion, Net			1,854	4,180
Other Non-Cash Operating Activities [Abstract]
Pension and non-pension postretirement benefit costs			86	196
Allowance for credit losses			96	100
Other decommissioning-related activity			36	(636)
Energy-related options			60	20
True-up adjustments to decoupling mechanisms and formula rates	$ (2)	$ 47	27	176
Long-term incentive plan			40	62
Amortization of operating ROU asset			38	83
AFUDC - Equity	(38)	(34)	(74)	(64)
Other Non-Cash Activity
Other Non-Cash Operating Activities [Abstract]
True-up adjustments to decoupling mechanisms and formula rates			(27)	(176)
Return on borrowed funds
Other Non-Cash Operating Activities [Abstract]
AFUDC - Equity			(74)	(64)
Commonwealth Edison Co [Member]
Depreciation, Amortization and Accretion [Abstract]
Property, plant and equipment			511	480
Amortization of regulatory assets			138	109
Amortization of intangible assets, net			0	0
Amortization of energy contract assets and liabilities			0	0
Nuclear fuel			0	0
ARO accretion			0	0
Depreciation, Amortization and Accretion, Net			649	589
Other Non-Cash Operating Activities [Abstract]
Pension and non-pension postretirement benefit costs			30	64
Allowance for credit losses			29	24
Other decommissioning-related activity			0	0
Energy-related options			0	0
True-up adjustments to decoupling mechanisms and formula rates	35	9	75	64
Long-term incentive plan			0	0
Amortization of operating ROU asset			1	1
AFUDC - Equity	(9)	(9)	(17)	(13)
Commonwealth Edison Co [Member] \| Other Non-Cash Activity
Other Non-Cash Operating Activities [Abstract]
True-up adjustments to decoupling mechanisms and formula rates			(75)	(64)
Commonwealth Edison Co [Member] \| Return on borrowed funds
Other Non-Cash Operating Activities [Abstract]
AFUDC - Equity			(17)	(13)
PECO Energy Co [Member]
Depreciation, Amortization and Accretion [Abstract]
Property, plant and equipment			177	165
Amortization of regulatory assets			8	8
Amortization of intangible assets, net			0	0
Amortization of energy contract assets and liabilities			0	0
Nuclear fuel			0	0
ARO accretion			0	0
Depreciation, Amortization and Accretion, Net			185	173
Other Non-Cash Operating Activities [Abstract]
Pension and non-pension postretirement benefit costs			(4)	4
Allowance for credit losses			21	17
Other decommissioning-related activity			0	0
Energy-related options			0	0
True-up adjustments to decoupling mechanisms and formula rates	0	7	6	17
Long-term incentive plan			0	0
Amortization of operating ROU asset			0	0
AFUDC - Equity	(8)	(6)	(15)	(12)
PECO Energy Co [Member] \| Other Non-Cash Activity
Other Non-Cash Operating Activities [Abstract]
True-up adjustments to decoupling mechanisms and formula rates			(6)	(17)
PECO Energy Co [Member] \| Return on borrowed funds
Other Non-Cash Operating Activities [Abstract]
AFUDC - Equity			(15)	(12)
Baltimore Gas and Electric Company [Member]
Depreciation, Amortization and Accretion [Abstract]
Property, plant and equipment			235	215
Amortization of regulatory assets			87	78
Amortization of intangible assets, net			0	0
Amortization of energy contract assets and liabilities			0	0
Nuclear fuel			0	0
ARO accretion			0	0
Depreciation, Amortization and Accretion, Net			322	293
Other Non-Cash Operating Activities [Abstract]
Pension and non-pension postretirement benefit costs			22	29
Allowance for credit losses			18	4
Other decommissioning-related activity			0	0
Energy-related options			0	0
True-up adjustments to decoupling mechanisms and formula rates	(20)	(10)	(32)	8
Long-term incentive plan			0	0
Amortization of operating ROU asset			14	15
AFUDC - Equity	(6)	(7)	(12)	(14)
Baltimore Gas and Electric Company [Member] \| Other Non-Cash Activity
Other Non-Cash Operating Activities [Abstract]
True-up adjustments to decoupling mechanisms and formula rates			32	(8)
Baltimore Gas and Electric Company [Member] \| Return on borrowed funds
Other Non-Cash Operating Activities [Abstract]
AFUDC - Equity			(12)	(14)
Pepco Holdings LLC [Member]
Depreciation, Amortization and Accretion [Abstract]
Property, plant and equipment			335	309
Amortization of regulatory assets			124	95
Amortization of intangible assets, net			0	0
Amortization of energy contract assets and liabilities			0	0
Nuclear fuel			0	0
ARO accretion			0	0
Depreciation, Amortization and Accretion, Net			459	404
Other Non-Cash Operating Activities [Abstract]
Pension and non-pension postretirement benefit costs			26	24
Allowance for credit losses			29	9
Other decommissioning-related activity			0	0
Energy-related options			0	0
True-up adjustments to decoupling mechanisms and formula rates	(17)	41	(22)	88
Long-term incentive plan			0	0
Amortization of operating ROU asset			14	14
AFUDC - Equity	(15)	(12)	(30)	(25)
Pepco Holdings LLC [Member] \| Other Non-Cash Activity
Other Non-Cash Operating Activities [Abstract]
True-up adjustments to decoupling mechanisms and formula rates			22	(88)
Pepco Holdings LLC [Member] \| Return on borrowed funds
Other Non-Cash Operating Activities [Abstract]
AFUDC - Equity			(30)	(25)
Potomac Electric Power Company [Member]
Depreciation, Amortization and Accretion [Abstract]
Property, plant and equipment			145	135
Amortization of regulatory assets			68	64
Amortization of intangible assets, net			0	0
Amortization of energy contract assets and liabilities			0	0
Nuclear fuel			0	0
ARO accretion			0	0
Depreciation, Amortization and Accretion, Net			213	199
Other Non-Cash Operating Activities [Abstract]
Pension and non-pension postretirement benefit costs			4	3
Allowance for credit losses			16	5
Other decommissioning-related activity			0	0
Energy-related options			0	0
True-up adjustments to decoupling mechanisms and formula rates	(1)	19	(7)	46
Long-term incentive plan			0	0
Amortization of operating ROU asset			4	3
AFUDC - Equity	(11)	(10)	(22)	(20)
Potomac Electric Power Company [Member] \| Other Non-Cash Activity
Other Non-Cash Operating Activities [Abstract]
True-up adjustments to decoupling mechanisms and formula rates			7	(46)
Potomac Electric Power Company [Member] \| Return on borrowed funds
Other Non-Cash Operating Activities [Abstract]
AFUDC - Equity			(22)	(20)
Delmarva Power and Light Company [Member]
Depreciation, Amortization and Accretion [Abstract]
Property, plant and equipment			92	84
Amortization of regulatory assets			21	20
Amortization of intangible assets, net			0	0
Amortization of energy contract assets and liabilities			0	0
Nuclear fuel			0	0
ARO accretion			0	0
Depreciation, Amortization and Accretion, Net			113	104
Other Non-Cash Operating Activities [Abstract]
Pension and non-pension postretirement benefit costs			2	1
Allowance for credit losses			6	2
Other decommissioning-related activity			0	0
Energy-related options			0	0
True-up adjustments to decoupling mechanisms and formula rates	(2)	10	(3)	19
Long-term incentive plan			0	0
Amortization of operating ROU asset			4	5
AFUDC - Equity	(2)	(1)	(4)	(3)
Delmarva Power and Light Company [Member] \| Other Non-Cash Activity
Other Non-Cash Operating Activities [Abstract]
True-up adjustments to decoupling mechanisms and formula rates			3	(19)
Delmarva Power and Light Company [Member] \| Return on borrowed funds
Other Non-Cash Operating Activities [Abstract]
AFUDC - Equity			(4)	(3)
Atlantic City Electric Company [Member]
Depreciation, Amortization and Accretion [Abstract]
Property, plant and equipment			83	76
Amortization of regulatory assets			35	11
Amortization of intangible assets, net			0	0
Amortization of energy contract assets and liabilities			0	0
Nuclear fuel			0	0
ARO accretion			0	0
Depreciation, Amortization and Accretion, Net			118	87
Other Non-Cash Operating Activities [Abstract]
Pension and non-pension postretirement benefit costs			6	5
Allowance for credit losses			7	2
Other decommissioning-related activity			0	0
Energy-related options			0	0
True-up adjustments to decoupling mechanisms and formula rates	(15)	12	(12)	23
Long-term incentive plan			0	0
Amortization of operating ROU asset			2	2
AFUDC - Equity	$ (2)	$ (1)	(4)	(2)
Atlantic City Electric Company [Member] \| Other Non-Cash Activity
Other Non-Cash Operating Activities [Abstract]
True-up adjustments to decoupling mechanisms and formula rates			12	(23)
Atlantic City Electric Company [Member] \| Return on borrowed funds
Other Non-Cash Operating Activities [Abstract]
AFUDC - Equity			$ (4)	$ (2)

Supplemental Financial Inform_6

Supplemental Financial Information - Balance Sheet (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021	Jun. 30, 2021	Dec. 31, 2020
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]
Cash and cash equivalents	$ 816	$ 672	$ 1,578	$ 432
Restricted cash	961	321	379	349
Restricted cash included in other long-term assets	59	44	52	53
Cash, restricted cash, and cash equivalents - Held for Sale		582		332
Total cash, restricted cash, and cash equivalents	1,836	1,619	2,009	1,166
Accrued Expenses [Abstract]
Compensation-related accruals	428	596
Taxes accrued	243	253
Interest accrued	331	297
Commonwealth Edison Co [Member]
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]
Cash and cash equivalents	120	131	71	83
Restricted cash	384	210	240	279
Restricted cash included in other long-term assets	59	43	43	43
Cash, restricted cash, and cash equivalents - Held for Sale		0		0
Total cash, restricted cash, and cash equivalents	563	384	354	405
Accrued Expenses [Abstract]
Compensation-related accruals	109	155
Taxes accrued	94	94
Interest accrued	124	116
PECO Energy Co [Member]
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]
Cash and cash equivalents	23	36	376	19
Restricted cash	9	8	8	7
Restricted cash included in other long-term assets	0	0	0	0
Cash, restricted cash, and cash equivalents - Held for Sale		0		0
Total cash, restricted cash, and cash equivalents	32	44	384	26
Accrued Expenses [Abstract]
Compensation-related accruals	57	77
Taxes accrued	60	14
Interest accrued	40	41
Baltimore Gas and Electric Company [Member]
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]
Cash and cash equivalents	354	51	368	144
Restricted cash	205	4	3	1
Restricted cash included in other long-term assets	0	0	0	0
Cash, restricted cash, and cash equivalents - Held for Sale		0		0
Total cash, restricted cash, and cash equivalents	559	55	371	145
Accrued Expenses [Abstract]
Compensation-related accruals	54	78
Taxes accrued	31	53
Interest accrued	44	44
Pepco Holdings LLC [Member]
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]
Cash and cash equivalents	278	136	61	111
Restricted cash	341	77	42	39
Restricted cash included in other long-term assets	0	0	9	10
Cash, restricted cash, and cash equivalents - Held for Sale		0		0
Total cash, restricted cash, and cash equivalents	619	213	112	160
Accrued Expenses [Abstract]
Compensation-related accruals	82	113
Taxes accrued	84	96
Interest accrued	59	52
Potomac Electric Power Company [Member]
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]
Cash and cash equivalents	14	34	17	30
Restricted cash	117	34	33	35
Restricted cash included in other long-term assets	0	0	0	0
Cash, restricted cash, and cash equivalents - Held for Sale		0		0
Total cash, restricted cash, and cash equivalents	131	68	50	65
Accrued Expenses [Abstract]
Compensation-related accruals	26	35
Taxes accrued	57	88
Interest accrued	31	28
Delmarva Power and Light Company [Member]
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]
Cash and cash equivalents	26	28	17	15
Restricted cash	223	43	5	0
Restricted cash included in other long-term assets	0	0	0	0
Cash, restricted cash, and cash equivalents - Held for Sale		0		0
Total cash, restricted cash, and cash equivalents	249	71	22	15
Accrued Expenses [Abstract]
Compensation-related accruals	16	20
Taxes accrued	12	9
Interest accrued	9	8
Atlantic City Electric Company [Member]
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]
Cash and cash equivalents	233	29	11	17
Restricted cash	0	0	3	3
Restricted cash included in other long-term assets	0	0	9	10
Cash, restricted cash, and cash equivalents - Held for Sale		0		0
Total cash, restricted cash, and cash equivalents	233	29	$ 23	$ 30
Accrued Expenses [Abstract]
Compensation-related accruals	13	17
Taxes accrued	11	11
Interest accrued	$ 14	$ 11

Related Party Transactions - Ut

Related Party Transactions - Utility Registrants' expense with Generation (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Related Party Transaction [Line Items]
Purchased power and/or fuel from affiliates	$ 0	$ (257)	$ (159)	$ (550)
Exelon Generation Co L L C [Member] \| Commonwealth Edison Co Affiliate [Member]
Related Party Transaction [Line Items]
Revenue from Related Parties	0	78	59	163
Exelon Generation Co L L C [Member] \| PECO Energy Co Affiliate [Member]
Related Party Transaction [Line Items]
Revenue from Related Parties	0	41	33	83
Exelon Generation Co L L C [Member] \| Baltimore Gas And Electric Company Affiliate [Member]
Related Party Transaction [Line Items]
Revenue from Related Parties	0	58	18	130
Exelon Generation Co L L C [Member] \| Pepco Holdings LLC Affiliate [Member]
Related Party Transaction [Line Items]
Revenue from Related Parties	0	77	51	176
Exelon Generation Co L L C [Member] \| Potomac Electric Power Co Affiliate [Member]
Related Party Transaction [Line Items]
Revenue from Related Parties	0	55	39	130
Exelon Generation Co L L C [Member] \| Delmarva Power and Light Co Affiliate [Member]
Related Party Transaction [Line Items]
Revenue from Related Parties	0	17	10	37
Exelon Generation Co L L C [Member] \| Atlantic City Electric Co Affiliate [Member]
Related Party Transaction [Line Items]
Revenue from Related Parties	0	5	2	9
Commonwealth Edison Co [Member]
Related Party Transaction [Line Items]
Revenue from Related Parties	3	5	8	11
Purchased power and/or fuel from affiliates	$ 0	$ (79)	$ (59)	$ (163)

Related Party Transactions - BS

Related Party Transactions - BSC and PHISCO Service Companies (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Exelon Business Services Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction Capitalized Costs Support Services	$ 139	$ 114	$ 344	$ 249
PHI Service Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction Capitalized Costs Support Services	21	17	40	36
Commonwealth Edison Co [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Expenses from Transactions with Related Party	80	73	166	144
Commonwealth Edison Co [Member] \| Exelon Business Services Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Expenses from Transactions with Related Party	80	72	165	143
Related Party Transaction Capitalized Costs Support Services	67	45	152	102
PECO Energy Co [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Expenses from Transactions with Related Party	47	43	99	83
PECO Energy Co [Member] \| Exelon Business Services Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Expenses from Transactions with Related Party	47	40	96	80
Related Party Transaction Capitalized Costs Support Services	20	17	56	44
Baltimore Gas and Electric Company [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Expenses from Transactions with Related Party	51	46	102	91
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	51	45	102	88
Related Party Transaction Capitalized Costs Support Services	22	20	60	43
Pepco Holdings LLC [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Expenses from Transactions with Related Party	47	39	98	79
Pepco Holdings LLC [Member] \| Exelon Business Services Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Expenses from Transactions with Related Party	46	37	96	76
Related Party Transaction Capitalized Costs Support Services	30	32	76	60
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	0
Related Party Transaction Capitalized Costs Support Services	21	17	40	36
Potomac Electric Power Company [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Expenses from Transactions with Related Party	56	51	115	103
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	27	23	56	45
Related Party Transaction Capitalized Costs Support Services	11	13	28	25
Potomac Electric Power Company [Member] \| PHI Service Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Expenses from Transactions with Related Party	29	28	58	57
Related Party Transaction Capitalized Costs Support Services	8	7	16	15
Delmarva Power and Light Company [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Expenses from Transactions with Related Party	43	39	84	79
Delmarva Power and Light Company [Member] \| Exelon Business Services Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Expenses from Transactions with Related Party	17	15	35	29
Related Party Transaction Capitalized Costs Support Services	9	10	23	19
Delmarva Power and Light Company [Member] \| PHI Service Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Expenses from Transactions with Related Party	25	24	49	49
Related Party Transaction Capitalized Costs Support Services	7	5	13	11
Atlantic City Electric Company [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Expenses from Transactions with Related Party	36	34	73	68
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	14	12	29	24
Related Party Transaction Capitalized Costs Support Services	10	8	25	15
Atlantic City Electric Company [Member] \| PHI Service Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Expenses from Transactions with Related Party	22	21	43	43
Related Party Transaction Capitalized Costs Support Services	$ 6	$ 5	$ 11	$ 10

Related Party Transactions - Cu

Related Party Transactions - Current Receivables From/Payables To Affiliates (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	$ 220	$ 523
Accounts Payable, Related Parties, Current	5	5
Commonwealth Edison Co [Member]
Related Party Transaction [Line Items]
Accounts Payable, Related Parties, Current	65	121
Accounts Receivable, Related Parties, Current	3	16
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] \| Affiliated Entity [Member]
Related Party Transaction [Line Items]
Accounts Payable, Related Parties, Current	65	121
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
PECO Energy Co [Member]
Related Party Transaction [Line Items]
Accounts Payable, Related Parties, Current	29	70
Accounts Receivable, Related Parties, Current	0	1
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	0	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	0	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]
Accounts Payable, Related Parties, Current	30	48
Accounts Receivable, Related Parties, Current	0	1
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]
Accounts Payable, Related Parties, Current	50	104
Accounts Receivable, Related Parties, Current	1	2
Pepco Holdings LLC [Member] \| Affiliated Entity [Member]
Related Party Transaction [Line Items]
Accounts Payable, Related Parties, Current	15	16
Potomac Electric Power Company [Member]
Related Party Transaction [Line Items]
Accounts Payable, Related Parties, Current	29	59
Accounts Receivable, Related Parties, Current	9	0
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	9	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 and Light Company [Member]
Related Party Transaction [Line Items]
Accounts Payable, Related Parties, Current	29	33
Accounts Receivable, Related Parties, Current	0	1
Delmarva Power and Light Company [Member] \| Exelon Generation Co LLC Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current		0
Delmarva Power and Light Company [Member] \| Commonwealth Edison Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	0	0
Delmarva Power and Light Company [Member] \| PECO Energy Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	0	0
Delmarva Power and Light 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
Delmarva Power and Light Company [Member] \| Pepco Holdings LLC Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	0	0
Delmarva Power and Light Company [Member] \| Potomac Electric Power Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	0	1
Delmarva Power and Light Company [Member] \| Atlantic City Electric Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	0	0
Delmarva Power and Light Company [Member] \| Other Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	0	0
Atlantic City Electric Company [Member]
Related Party Transaction [Line Items]
Accounts Payable, Related Parties, Current	20	31
Accounts Receivable, Related Parties, Current	1	2
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	1	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	0	0
Business Services Company [Member]
Related Party Transaction [Line Items]
Accounts Receivable, Related Parties, Current	147	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	57	71
Business Services Company [Member] \| PECO Energy Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	25	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	28	41
Business Services Company [Member] \| Pepco Holdings LLC Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	5	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	14	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	9	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	9	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]
Accounts Receivable, Related Parties, Current	33	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	10	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	10	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]
Accounts Payable, Related Parties, Current	3	14
Accounts Receivable, Related Parties, Current	27	47
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	4	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	2	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	1	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
Exelon Generation Co LLC Affiliate [Member]
Related Party Transaction [Line Items]
Accounts Payable, Related Parties, Current		131
Accounts Receivable, Related Parties, Current		117
Exelon Generation Co LLC Affiliate [Member] \| Commonwealth Edison Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current		41
Exelon Generation Co LLC Affiliate [Member] \| PECO Energy Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current		30
Exelon Generation Co LLC Affiliate [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 LLC Affiliate [Member] \| Pepco Holdings LLC Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current		0
Exelon Generation Co LLC Affiliate [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 LLC Affiliate [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 LLC Affiliate [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 LLC Affiliate [Member] \| Other Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current		$ 11

Related Party Transactions - Lo

Related Party Transactions - Long Term Debt to Financing Trusts (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Related Party Transaction [Line Items]
Long-term debt to financing trust	$ 390	$ 390
ComEd Financing Three Affiliate [Member]
Related Party Transaction [Line Items]
Long-term debt to financing trust	206	206
PECO Trust Three Affiliate [Member]
Related Party Transaction [Line Items]
Long-term debt to financing trust	81	81
PECO Trust Four Affiliate [Member]
Related Party Transaction [Line Items]
Long-term debt to financing trust	103	103
Commonwealth Edison Co [Member]
Related Party Transaction [Line Items]
Long-term debt to financing trust	205	205
Commonwealth Edison Co [Member] \| ComEd Financing Three Affiliate [Member]
Related Party Transaction [Line Items]
Long-term debt to financing trust	205	205
Commonwealth Edison Co [Member] \| PECO Trust Three Affiliate [Member]
Related Party Transaction [Line Items]
Long-term debt to financing trust	0	0
Commonwealth Edison Co [Member] \| PECO Trust Four Affiliate [Member]
Related Party Transaction [Line Items]
Long-term debt to financing trust	0	0
PECO Energy Co [Member]
Related Party Transaction [Line Items]
Long-term debt to financing trust	184	184
PECO Energy Co [Member] \| ComEd Financing Three Affiliate [Member]
Related Party Transaction [Line Items]
Long-term debt to financing trust	0	0
PECO Energy Co [Member] \| PECO Trust Three Affiliate [Member]
Related Party Transaction [Line Items]
Long-term debt to financing trust	81	81
PECO Energy Co [Member] \| PECO Trust Four Affiliate [Member]
Related Party Transaction [Line Items]
Long-term debt to financing trust	$ 103	$ 103