Pepco 10-Q3 May 232023 Q1 Quarterly reportFinancial data

Company Profile

Cover Page

Cover Page	3 Months Ended
Cover Page	Mar. 31, 2023 shares
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2023
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	994,568,998
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q1
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	127,021,394
Entity Central Index Key	0000022606
PECO Energy Co [Member]
Entity File Number	000-16844
Entity Registrant Name	PECO ENERGY COMPANY
Entity Tax Identification Number	23-0970240
Entity Incorporation, State or Country Code	PA
Entity Address, Address Line One	P.O. Box 8699
Entity Address, Address Line Two	2301 Market Street
Entity Address, City or Town	Philadelphia
Entity Address, State or Province	PA
Entity Address, Postal Zip Code	19101-8699
City Area Code	(215)
Local Phone Number	841-4000
Title of 12(b) Security	Cumulative Preferred Security, Series D
Trading Symbol	EXC/28
Security Exchange Name	NYSE
Entity 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
	Mar. 31, 2023	Mar. 31, 2022
Operating revenues
Revenues from alternative revenue programs	$ 279	$ 29
Total operating revenues	5,563	5,327
Operating expenses
Purchased power and/or fuel from affiliates	0	159
Operating and maintenance	1,151	1,178
Depreciation and amortization	860	817
Taxes other than income taxes	355	354
Total operating expenses	4,457	4,427
Operating income (loss)	1,106	900
Other income and (deductions)
Interest expense, net	(406)	(332)
Interest expense to affiliates	(6)	(6)
Other, net	109	137
Total other income and (deductions)	(303)	(201)
Income (Loss) before income taxes	803	699
Income taxes	134	218
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	669	481
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	0	117
Net income (loss)	669	598
Net income (loss) attributable to noncontrolling interests	0	1
Net Income (Loss) Available to Common Stockholders, Basic	669	597
Net Income (Loss) from Continuing Operations Available to Common Shareholders, Basic	669	481
Net Income (Loss) from Discontinued Operations Available to Common Shareholders, Basic	0	116
Other comprehensive income (loss), net of income taxes
Actuarial loss reclassified to periodic benefit cost	3	14
Pension and non-pension postretirement benefit plan valuation adjustment	(10)	0
Unrealized (loss) gain on cash flow hedges	6	0
Other comprehensive (loss) income	(1)	14
Comprehensive income	668	612
Comprehensive income attributable to noncontrolling interests	0	1
Comprehensive income attributable to common shareholders/membership interest	$ 668	$ 611
Average shares of common stock outstanding:
Basic average shares of common stock outstanding	995	981
Assumed exercise and/or distributions of stock-based awards	1	0
Diluted average shares of common stock outstanding	996	981
Earnings Per Share [Abstract]
Income (Loss) from Continuing Operations, Per Basic Share	$ 0.67	$ 0.49
Income (Loss) from Continuing Operations, Per Diluted Share	0.67	0.49
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Basic Share	0	0.12
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Diluted Share	$ 0	$ 0.12
Commonwealth Edison Co [Member]
Operating revenues
Revenues from alternative revenue programs	$ 153	$ 40
Operating revenues from affiliates	3	6
Total operating revenues	1,667	1,734
Operating expenses
Purchased power and/or fuel from affiliates	0	59
Operating and maintenance	254	266
Related Party Transaction, Expenses from Transactions with Related Party	83	85
Depreciation and amortization	338	321
Taxes other than income taxes	93	96
Total operating expenses	1,256	1,406
Operating income (loss)	411	328
Other income and (deductions)
Interest expense, net	(114)	(97)
Interest expense to affiliates	(3)	(3)
Other, net	18	12
Total other income and (deductions)	(99)	(88)
Income (Loss) before income taxes	312	240
Income taxes	71	52
Net income (loss)	241	188
Other comprehensive income (loss), net of income taxes
Comprehensive income	241	188
PECO Energy Co [Member]
Operating revenues
Revenues from alternative revenue programs	(4)	6
Operating revenues from affiliates	2	1
Total operating revenues	1,112	1,047
Operating expenses
Purchased power and/or fuel from affiliates	0	33
Operating and maintenance	219	196
Related Party Transaction, Expenses from Transactions with Related Party	51	51
Depreciation and amortization	98	92
Taxes other than income taxes	50	47
Total operating expenses	902	793
Operating income (loss)	210	254
Other income and (deductions)
Interest expense, net	(45)	(38)
Interest expense to affiliates	(3)	(3)
Other, net	8	7
Total other income and (deductions)	(40)	(34)
Income (Loss) before income taxes	170	220
Income taxes	4	14
Net income (loss)	166	206
Other comprehensive income (loss), net of income taxes
Comprehensive income	166	206
Baltimore Gas and Electric Company [Member]
Operating revenues
Revenues from alternative revenue programs	65	(12)
Operating revenues from affiliates	3	7
Total operating revenues	1,257	1,154
Operating expenses
Purchased power and/or fuel from affiliates	0	18
Operating and maintenance	168	167
Related Party Transaction, Expenses from Transactions with Related Party	54	51
Depreciation and amortization	167	171
Taxes other than income taxes	83	76
Total operating expenses	964	919
Operating income (loss)	293	235
Other income and (deductions)
Interest expense, net	(44)	(35)
Other, net	3	7
Total other income and (deductions)	(41)	(28)
Income (Loss) before income taxes	252	207
Income taxes	52	9
Net income (loss)	200	198
Other comprehensive income (loss), net of income taxes
Comprehensive income	200	198
Pepco Holdings LLC [Member]
Operating revenues
Revenues from alternative revenue programs	65	(5)
Operating revenues from affiliates	3	3
Total operating revenues	1,536	1,404
Operating expenses
Purchased power and/or fuel from affiliates	0	50
Operating and maintenance	267	248
Related Party Transaction, Expenses from Transactions with Related Party	42	51
Depreciation and amortization	241	218
Taxes other than income taxes	120	119
Total operating expenses	1,297	1,215
Operating income (loss)	239	189
Other income and (deductions)
Interest expense, net	(76)	(69)
Other, net	26	17
Total other income and (deductions)	(50)	(52)
Income (Loss) before income taxes	189	137
Income taxes	34	7
Net income (loss)	155	130
Other comprehensive income (loss), net of income taxes
Comprehensive income attributable to common shareholders/membership interest	155	130
Potomac Electric Power Company [Member]
Operating revenues
Revenues from alternative revenue programs	39	(7)
Operating revenues from affiliates	1	1
Total operating revenues	710	614
Operating expenses
Purchased power and/or fuel from affiliates	0	39
Operating and maintenance	93	73
Related Party Transaction, Expenses from Transactions with Related Party	57	58
Depreciation and amortization	108	108
Taxes other than income taxes	94	95
Total operating expenses	610	547
Operating income (loss)	100	67
Other income and (deductions)
Interest expense, net	(39)	(36)
Other, net	16	13
Total other income and (deductions)	(23)	(23)
Income (Loss) before income taxes	77	44
Income taxes	12	(2)
Net income (loss)	65	46
Other comprehensive income (loss), net of income taxes
Comprehensive income	65	46
Delmarva Power and Light Company [Member]
Operating revenues
Revenues from alternative revenue programs	9	(1)
Operating revenues from affiliates	2	1
Total operating revenues	474	431
Operating expenses
Purchased power and/or fuel from affiliates	0	10
Operating and maintenance	46	51
Related Party Transaction, Expenses from Transactions with Related Party	41	42
Depreciation and amortization	60	57
Taxes other than income taxes	20	18
Total operating expenses	388	357
Operating income (loss)	86	74
Other income and (deductions)
Interest expense, net	(17)	(16)
Other, net	3	2
Total other income and (deductions)	(14)	(14)
Income (Loss) before income taxes	72	60
Income taxes	12	4
Net income (loss)	60	56
Other comprehensive income (loss), net of income taxes
Comprehensive income	60	56
Atlantic City Electric Company [Member]
Operating revenues
Revenues from alternative revenue programs	17	3
Operating revenues from affiliates	1	1
Total operating revenues	353	349
Operating expenses
Purchased power and/or fuel from affiliates	0	2
Operating and maintenance	44	47
Related Party Transaction, Expenses from Transactions with Related Party	37	37
Depreciation and amortization	67	47
Taxes other than income taxes	2	2
Total operating expenses	298	311
Operating income (loss)	55	38
Other income and (deductions)
Interest expense, net	(16)	(14)
Other, net	5	3
Total other income and (deductions)	(11)	(11)
Income (Loss) before income taxes	44	27
Income taxes	11	1
Net income (loss)	33	26
Other comprehensive income (loss), net of income taxes
Comprehensive income	33	26
Electricity, US Regulated
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax	4,462	4,481
Operating expenses
Purchased power and/or fuel	1,733	1,581
Electricity, US Regulated \| Commonwealth Edison Co [Member]
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax	1,511	1,688
Operating expenses
Purchased power and/or fuel	488	579
Electricity, US Regulated \| PECO Energy Co [Member]
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax	798	734
Operating expenses
Purchased power and/or fuel	330	229
Electricity, US Regulated \| Baltimore Gas and Electric Company [Member]
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax	780	735
Operating expenses
Purchased power and/or fuel	343	285
Electricity, US Regulated \| Pepco Holdings LLC [Member]
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax	1,371	1,323
Operating expenses
Purchased power and/or fuel	572	487
Electricity, US Regulated \| Potomac Electric Power Company [Member]
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax	670	620
Operating expenses
Purchased power and/or fuel	258	174
Electricity, US Regulated \| Delmarva Power and Light Company [Member]
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax	366	348
Operating expenses
Purchased power and/or fuel	166	137
Electricity, US Regulated \| Atlantic City Electric Company [Member]
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax	335	345
Operating expenses
Purchased power and/or fuel	148	176
Natural Gas, US Regulated
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax	822	817
Operating expenses
Purchased power and/or fuel	358	338
Natural Gas, US Regulated \| PECO Energy Co [Member]
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax	316	306
Operating expenses
Purchased power and/or fuel	154	145
Natural Gas, US Regulated \| Baltimore Gas and Electric Company [Member]
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax	409	424
Operating expenses
Purchased power and/or fuel	149	151
Natural Gas, US Regulated \| Pepco Holdings LLC [Member]
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax	97	83
Operating expenses
Purchased power and/or fuel	55	42
Natural Gas, US Regulated \| Delmarva Power and Light Company [Member]
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax	97	83
Operating expenses
Purchased power and/or fuel	$ 55	$ 42

Consolidated Statements of Cash

Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Cash flows from operating activities
Net income (loss)	$ 669	$ 598
Adjustments to reconcile net income to net cash flows provided by operating activities:
Depreciation, amortization, and accretion, including nuclear fuel and energy contract amortization	860	1,024
Gain on sales of assets and businesses	0	(10)
Deferred income taxes and amortization of investment tax credits	113	110
Net fair value changes related to derivatives	0	(59)
Net realized and unrealized (gains) losses on NDT funds	0	205
Net unrealized (gains) losses on equity investments	0	16
Other non-cash operating activities	(138)	232
Changes in assets and liabilities:
Accounts receivable	106	(711)
Inventories	102	125
Accounts payable and accrued expenses	(482)	291
Option premiums paid, net	0	(39)
Collateral received (posted), net	(214)	1,142
Income taxes	23	77
Regulatory assets and liabilities, net	(324)	(31)
Pension and non-pension postretirement benefit contributions	(44)	(574)
Other assets and liabilities	(187)	(614)
Net Cash Provided by (Used in) Operating Activities, Total	484	1,782
Cash flows from investing activities
Capital expenditures	(1,881)	(1,922)
Proceeds from NDT fund sales	0	488
Investment in NDT funds	0	(516)
Collection of deferred purchase price	0	169
Proceeds from Sale of Property Held-for-sale	0	16
Other investing activities	10	(54)
Net Cash Provided by (Used in) Investing Activities, Total	(1,871)	(1,819)
Cash flows from financing activities
Changes in short-term borrowings	(1,130)	(700)
Proceeds from short-term borrowings with maturities greater than 90 days	0	1,150
Repayments on short-term borrowings with maturities greater than 90 days	(150)	(350)
Issuance of long-term debt	3,925	4,301
Retirement of long-term debt	(857)	(6)
Dividends paid on common stock	(358)	(332)
Proceeds from employee stock plans	10	9
Transfer of cash, restricted cash, and cash equivalents to Constellation	0	(2,594)
Other financing activities	(60)	(62)
Net cash flows provided by financing activities	1,380	1,416
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect, Total	(7)	1,379
Cash, restricted cash, and cash equivalents at beginning of period	1,090	1,619
Cash, restricted cash, and cash equivalents at end of period	1,083	2,998
Supplemental Cash Flow Information
Decrease in capital expenditures not paid	(201)	(322)
Increase in deferred purchase price	0	348
Increase in PPE related to ARO update	0	(335)
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	0	207
Gain on sales of assets and businesses	0	9
Deferred income taxes and amortization of investment tax credits	0	(143)
Net fair value changes related to derivatives	0	(59)
Net realized and unrealized (gains) losses on NDT funds	0	205
Net unrealized (gains) losses on equity investments	0	16
Other non-cash operating activities	0	(36)
Cash flows from investing activities
Capital expenditures	0	(227)
Collection of deferred purchase price	0	169
Supplemental Cash Flow Information
Decrease in capital expenditures not paid	0	(128)
Increase in deferred purchase price	0	348
Increase in PPE related to ARO update	0	335
Commonwealth Edison Co [Member]
Cash flows from operating activities
Net income (loss)	241	188
Adjustments to reconcile net income to net cash flows provided by operating activities:
Depreciation, amortization, and accretion, including nuclear fuel and energy contract amortization	338	321
Deferred income taxes and amortization of investment tax credits	55	54
Other non-cash operating activities	(153)	(9)
Changes in assets and liabilities:
Accounts receivable	96	(45)
Receivables from payables to affiliates, net	10	(42)
Inventories	(21)	3
Accounts payable and accrued expenses	(306)	(154)
Collateral received (posted), net	(4)	43
Income taxes	15	(2)
Regulatory assets and liabilities, net	(338)	(8)
Pension and non-pension postretirement benefit contributions	(23)	(176)
Other assets and liabilities	(22)	(29)
Net Cash Provided by (Used in) Operating Activities, Total	(112)	144
Cash flows from investing activities
Capital expenditures	(617)	(617)
Other investing activities	1	7
Net Cash Provided by (Used in) Investing Activities, Total	(616)	(610)
Cash flows from financing activities
Changes in short-term borrowings	(18)	0
Repayments on short-term borrowings with maturities greater than 90 days	(150)	0
Issuance of long-term debt	975	750
Dividends paid on common stock	(187)	(144)
Contributions from parent	186	167
Other financing activities	(11)	(10)
Net cash flows provided by financing activities	795	763
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect, Total	67	297
Cash, restricted cash, and cash equivalents at beginning of period	511	384
Cash, restricted cash, and cash equivalents at end of period	578	681
Supplemental Cash Flow Information
Decrease in capital expenditures not paid	(35)	(50)
PECO Energy Co [Member]
Cash flows from operating activities
Net income (loss)	166	206
Adjustments to reconcile net income to net cash flows provided by operating activities:
Depreciation, amortization, and accretion, including nuclear fuel and energy contract amortization	98	92
Deferred income taxes and amortization of investment tax credits	(16)	14
Other non-cash operating activities	32	15
Changes in assets and liabilities:
Accounts receivable	36	(40)
Receivables from payables to affiliates, net	8	(31)
Inventories	60	27
Accounts payable and accrued expenses	(176)	(24)
Income taxes	20	0
Regulatory assets and liabilities, net	15	(4)
Pension and non-pension postretirement benefit contributions	0	(12)
Other assets and liabilities	(75)	(102)
Net Cash Provided by (Used in) Operating Activities, Total	168	141
Cash flows from investing activities
Capital expenditures	(335)	(344)
Other investing activities	0	2
Net Cash Provided by (Used in) Investing Activities, Total	(335)	(342)
Cash flows from financing activities
Changes in short-term borrowings	(94)	0
Increase (Decrease) in Due to Affiliates, Current	0	65
Dividends paid on common stock	(101)	(100)
Contributions from parent	330	227
Other financing activities	0	(1)
Net cash flows provided by financing activities	135	191
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect, Total	(32)	(10)
Cash, restricted cash, and cash equivalents at beginning of period	68	44
Cash, restricted cash, and cash equivalents at end of period	36	34
Supplemental Cash Flow Information
Decrease in capital expenditures not paid	(9)	(41)
Baltimore Gas and Electric Company [Member]
Cash flows from operating activities
Net income (loss)	200	198
Adjustments to reconcile net income to net cash flows provided by operating activities:
Depreciation, amortization, and accretion, including nuclear fuel and energy contract amortization	167	171
Deferred income taxes and amortization of investment tax credits	24	5
Other non-cash operating activities	(32)	44
Changes in assets and liabilities:
Accounts receivable	43	(80)
Receivables from payables to affiliates, net	(3)	(2)
Inventories	62	32
Accounts payable and accrued expenses	(96)	(30)
Collateral received (posted), net	(22)	30
Income taxes	29	4
Regulatory assets and liabilities, net	(31)	(8)
Pension and non-pension postretirement benefit contributions	(8)	(56)
Other assets and liabilities	(24)	(31)
Net Cash Provided by (Used in) Operating Activities, Total	309	277
Cash flows from investing activities
Capital expenditures	(350)	(303)
Other investing activities	3	3
Net Cash Provided by (Used in) Investing Activities, Total	(347)	(300)
Cash flows from financing activities
Changes in short-term borrowings	(165)	120
Dividends paid on common stock	(80)	(76)
Contributions from parent	237	0
Other financing activities	0	(1)
Net cash flows provided by financing activities	(8)	43
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect, Total	(46)	20
Cash, restricted cash, and cash equivalents at beginning of period	67	55
Cash, restricted cash, and cash equivalents at end of period	21	75
Supplemental Cash Flow Information
Decrease in capital expenditures not paid	(70)	(32)
Pepco Holdings LLC [Member]
Cash flows from operating activities
Net income (loss)	155	130
Adjustments to reconcile net income to net cash flows provided by operating activities:
Depreciation, amortization, and accretion, including nuclear fuel and energy contract amortization	241	218
Deferred income taxes and amortization of investment tax credits	13	2
Other non-cash operating activities	(7)	35
Changes in assets and liabilities:
Accounts receivable	98	(21)
Receivables from payables to affiliates, net	0	(51)
Inventories	4	7
Accounts payable and accrued expenses	(88)	(23)
Collateral received (posted), net	(189)	37
Income taxes	20	5
Regulatory assets and liabilities, net	27	(18)
Pension and non-pension postretirement benefit contributions	(7)	(67)
Other assets and liabilities	(11)	(22)
Net Cash Provided by (Used in) Operating Activities, Total	256	232
Cash flows from investing activities
Capital expenditures	(561)	(409)
Other investing activities	8	2
Net Cash Provided by (Used in) Investing Activities, Total	(553)	(407)
Cash flows from financing activities
Changes in short-term borrowings	(414)	(468)
Issuance of long-term debt	450	700
Increase (Decrease) in Due to Affiliates, Current	8	39
Payments of Distributions to Affiliates	(112)	(102)
Proceeds from Contributions from Affiliates	405	704
Other financing activities	(17)	(9)
Net cash flows provided by financing activities	320	864
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect, Total	23	689
Cash, restricted cash, and cash equivalents at beginning of period	373	213
Cash, restricted cash, and cash equivalents at end of period	396	902
Supplemental Cash Flow Information
Decrease in capital expenditures not paid	(76)	(55)
Potomac Electric Power Company [Member]
Cash flows from operating activities
Net income (loss)	65	46
Adjustments to reconcile net income to net cash flows provided by operating activities:
Depreciation, amortization, and accretion, including nuclear fuel and energy contract amortization	108	108
Deferred income taxes and amortization of investment tax credits	3	(2)
Other non-cash operating activities	(10)	12
Changes in assets and liabilities:
Accounts receivable	52	(2)
Receivables from payables to affiliates, net	3	(25)
Inventories	(3)	0
Accounts payable and accrued expenses	(27)	5
Collateral received (posted), net	(25)	1
Income taxes	8	1
Regulatory assets and liabilities, net	(3)	(7)
Pension and non-pension postretirement benefit contributions	(4)	(5)
Other assets and liabilities	11	(12)
Net Cash Provided by (Used in) Operating Activities, Total	178	120
Cash flows from investing activities
Capital expenditures	(264)	(218)
Other investing activities	8	1
Net Cash Provided by (Used in) Investing Activities, Total	(256)	(217)
Cash flows from financing activities
Changes in short-term borrowings	(299)	(175)
Issuance of long-term debt	250	400
Dividends paid on common stock	(48)	(42)
Contributions from parent	243	387
Other financing activities	(14)	(5)
Net cash flows provided by financing activities	132	565
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect, Total	54	468
Cash, restricted cash, and cash equivalents at beginning of period	99	68
Cash, restricted cash, and cash equivalents at end of period	153	536
Supplemental Cash Flow Information
Decrease in capital expenditures not paid	(43)	(36)
Delmarva Power and Light Company [Member]
Cash flows from operating activities
Net income (loss)	60	56
Adjustments to reconcile net income to net cash flows provided by operating activities:
Depreciation, amortization, and accretion, including nuclear fuel and energy contract amortization	60	57
Deferred income taxes and amortization of investment tax credits	3	5
Other non-cash operating activities	(1)	9
Changes in assets and liabilities:
Accounts receivable	23	(17)
Receivables from payables to affiliates, net	4	(17)
Inventories	10	8
Accounts payable and accrued expenses	(16)	15
Collateral received (posted), net	(120)	30
Income taxes	9	(1)
Regulatory assets and liabilities, net	27	0
Pension and non-pension postretirement benefit contributions	0	(1)
Other assets and liabilities	1	3
Net Cash Provided by (Used in) Operating Activities, Total	60	147
Cash flows from investing activities
Capital expenditures	(134)	(103)
Other investing activities	0	1
Net Cash Provided by (Used in) Investing Activities, Total	(134)	(102)
Cash flows from financing activities
Changes in short-term borrowings	(115)	(149)
Issuance of long-term debt	125	125
Dividends paid on common stock	(42)	(41)
Contributions from parent	99	144
Other financing activities	(2)	(2)
Net cash flows provided by financing activities	65	77
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect, Total	(9)	122
Cash, restricted cash, and cash equivalents at beginning of period	152	71
Cash, restricted cash, and cash equivalents at end of period	143	193
Supplemental Cash Flow Information
Decrease in capital expenditures not paid	(3)	(8)
Atlantic City Electric Company [Member]
Cash flows from operating activities
Net income (loss)	33	26
Adjustments to reconcile net income to net cash flows provided by operating activities:
Depreciation, amortization, and accretion, including nuclear fuel and energy contract amortization	67	47
Deferred income taxes and amortization of investment tax credits	6	1
Other non-cash operating activities	(9)	2
Changes in assets and liabilities:
Accounts receivable	24	(1)
Receivables from payables to affiliates, net	(1)	(6)
Inventories	(3)	(1)
Accounts payable and accrued expenses	(15)	(17)
Collateral received (posted), net	(44)	(3)
Income taxes	5	0
Regulatory assets and liabilities, net	3	(3)
Pension and non-pension postretirement benefit contributions	(1)	(7)
Other assets and liabilities	(21)	6
Net Cash Provided by (Used in) Operating Activities, Total	44	44
Cash flows from investing activities
Capital expenditures	(161)	(87)
Net Cash Provided by (Used in) Investing Activities, Total	(161)	(87)
Cash flows from financing activities
Changes in short-term borrowings	0	(144)
Issuance of long-term debt	75	175
Dividends paid on common stock	(21)	(19)
Contributions from parent	63	173
Other financing activities	(1)	(3)
Net cash flows provided by financing activities	116	182
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect, Total	(1)	139
Cash, restricted cash, and cash equivalents at beginning of period	72	29
Cash, restricted cash, and cash equivalents at end of period	71	168
Supplemental Cash Flow Information
Decrease in capital expenditures not paid	$ (30)	$ (10)

Consolidated Balance Sheets (Un

Consolidated Balance Sheets (Unaudited) - USD ($) shares in Millions, $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Current Assets
Cash and cash equivalents	$ 522	$ 407
Restricted cash and cash equivalents	381	566
Accounts receivable
Customer accounts receivable	2,493	2,544
Customer allowance for credit losses	(389)	(327)
Customer accounts receivable, net	2,104	2,217
Other accounts receivable	1,346	1,426
Other allowance for credit losses	(91)	(82)
Other accounts receivable, net	1,255	1,344
Inventories, net
Fossil fuel and emission allowances	70	208
Materials and supplies	582	547
Regulatory assets, current	2,386	1,641
Other	477	406
Total current assets	7,777	7,336
Accumulated depreciation and amortization	16,384	15,930
Property, plant and equipment, net	70,117	69,076
Deferred debits and other assets
Regulatory assets, noncurrent	7,878	8,037
Goodwill	6,630	6,630
Receivable related to Regulatory Agreement Units	3,069	2,897
Investments	234	232
Other	1,220	1,141
Total deferred debits and other assets	19,031	18,937
Total assets	96,925	95,349
Current Liabilities
Short-term borrowings	1,306	2,586
Long-term debt due within one year	1,356	1,802
Accounts payable	2,762	3,382
Accrued expenses	1,183	1,226
Payables to affiliates, current	5	5
Regulatory liabilities, current	472	437
Mark-to-market derivative liabilities, current	23	8
Unamortized energy contract liabilities, current	9	10
Other	976	1,155
Total current liabilities	8,092	10,611
Long-term debt	38,732	35,272
Long-term debt to financing trusts	390	390
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits	11,483	11,250
Regulatory liabilities, noncurrent	9,307	9,112
Asset retirement obligations, noncurrent	270	269
Pension obligations	1,101	1,109
Non-pension postretirement benefit obligations	506	507
Mark-to-market derivative liabilities, noncurrent	77	83
Unamortized energy contract liabilities, noncurrent	32	35
Other	1,869	1,967
Total deferred credits and other liabilities	24,645	24,332
Total Liabilities	71,859	70,605
Commitments and contingencies
Shareholders' equity
Common Stock, No Par Value	$ 0	$ 0
Common stock, shares authorized	2,000	2,000
Common stock, shares outstanding	994	994
Common stock	$ 20,921	$ 20,908
Treasury stock, shares	2	2
Treasury stock, at cost	$ (123)	$ (123)
Accumulated other comprehensive loss, net	(639)	(638)
Retained earnings/Undistributed earnings (losses)	4,907	4,597
Total shareholders’ equity	25,066	24,744
Members' Equity [Abstract]
Total liabilities and shareholders’ equity	96,925	95,349
Commonwealth Edison Co [Member]
Current Assets
Cash and cash equivalents	75	67
Restricted cash and cash equivalents	323	327
Accounts receivable
Customer accounts receivable	674	558
Customer allowance for credit losses	(74)	(59)
Customer accounts receivable, net	600	499
Other accounts receivable	233	441
Other allowance for credit losses	(18)	(17)
Other accounts receivable, net	215	424
Receivables from affiliates, current	3	3
Inventories, net
Inventories, net	216	196
Regulatory assets, current	1,472	775
Other	102	92
Total current assets	3,006	2,383
Accumulated depreciation and amortization	6,838	6,673
Property, plant and equipment, net	27,858	27,513
Deferred debits and other assets
Regulatory assets, noncurrent	2,517	2,667
Goodwill	2,625	2,625
Receivable related to Regulatory Agreement Units	2,804	2,660
Investments	6	6
Prepaid pension asset	1,225	1,206
Other	679	601
Total deferred debits and other assets	9,856	9,765
Total assets	40,720	39,661
Current Liabilities
Short-term borrowings	409	577
Accounts payable	801	1,010
Accrued expenses	305	415
Payables to affiliates, current	84	74
Customer deposits	109	108
Regulatory liabilities, current	233	226
Mark-to-market derivative liabilities, current	22	5
Other	189	191
Total current liabilities	2,152	2,606
Long-term debt	11,480	10,518
Long-term debt to financing trusts	205	205
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits	5,100	5,021
Regulatory liabilities, noncurrent	7,143	6,913
Asset retirement obligations, noncurrent	149	148
Non-pension postretirement benefit obligations	167	165
Mark-to-market derivative liabilities, noncurrent	76	79
Other	644	642
Total deferred credits and other liabilities	13,279	12,968
Total Liabilities	27,116	26,297
Commitments and contingencies
Shareholders' equity
Common stock	1,588	1,588
Other paid-in capital	9,932	9,746
Retained earnings/Undistributed earnings (losses)	2,084	2,030
Total shareholders’ equity	13,604	13,364
Members' Equity [Abstract]
Total liabilities and shareholders’ equity	40,720	39,661
PECO Energy Co [Member]
Current Assets
Cash and cash equivalents	27	59
Restricted cash and cash equivalents	9	9
Accounts receivable
Customer accounts receivable	588	635
Customer allowance for credit losses	(130)	(105)
Customer accounts receivable, net	458	530
Other accounts receivable	147	153
Other allowance for credit losses	(11)	(9)
Other accounts receivable, net	136	144
Receivables from affiliates, current	2	4
Inventories, net
Fossil fuel and emission allowances	41	99
Materials and supplies	50	52
Prepaid utility taxes	100	0
Regulatory assets, current	83	80
Other	43	38
Total current assets	949	1,015
Accumulated depreciation and amortization	4,135	4,078
Property, plant and equipment, net	12,359	12,125
Deferred debits and other assets
Regulatory assets, noncurrent	693	652
Receivable related to Regulatory Agreement Units	265	237
Investments	31	30
Prepaid pension asset	417	413
Other	24	30
Total deferred debits and other assets	1,430	1,362
Total assets	14,738	14,502
Current Liabilities
Short-term borrowings	145	239
Long-term debt due within one year	50	50
Accounts payable	543	668
Accrued expenses	95	142
Payables to affiliates, current	48	42
Customer deposits	66	63
Regulatory liabilities, current	95	75
Other	50	32
Total current liabilities	1,092	1,311
Long-term debt	4,563	4,562
Long-term debt to financing trusts	184	184
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits	2,245	2,213
Regulatory liabilities, noncurrent	295	270
Asset retirement obligations, noncurrent	28	28
Non-pension postretirement benefit obligations	286	286
Other	87	85
Total deferred credits and other liabilities	2,941	2,882
Total Liabilities	8,780	8,939
Commitments and contingencies
Shareholders' equity
Common stock	4,032	3,702
Retained earnings/Undistributed earnings (losses)	1,926	1,861
Total shareholders’ equity	5,958	5,563
Members' Equity [Abstract]
Total liabilities and shareholders’ equity	14,738	14,502
Baltimore Gas and Electric Company [Member]
Current Assets
Cash and cash equivalents	20	43
Restricted cash and cash equivalents	1	24
Accounts receivable
Customer accounts receivable	581	617
Customer allowance for credit losses	(73)	(54)
Customer accounts receivable, net	508	563
Other accounts receivable	128	132
Other allowance for credit losses	(12)	(10)
Other accounts receivable, net	116	122
Receivables from affiliates, current	0	0
Inventories, net
Fossil fuel and emission allowances	23	91
Materials and supplies	71	65
Prepaid utility taxes	49	52
Regulatory assets, current	237	177
Other	13	13
Total current assets	1,038	1,150
Accumulated depreciation and amortization	4,658	4,583
Property, plant and equipment, net	11,493	11,338
Deferred debits and other assets
Regulatory assets, noncurrent	533	527
Investments	9	7
Prepaid pension asset	280	291
Other	58	37
Total deferred debits and other assets	880	862
Total assets	13,411	13,350
Current Liabilities
Short-term borrowings	243	408
Long-term debt due within one year	300	300
Accounts payable	310	462
Accrued expenses	174	159
Payables to affiliates, current	37	39
Customer deposits	107	105
Regulatory liabilities, current	61	47
Other	34	55
Total current liabilities	1,266	1,575
Long-term debt	3,908	3,907
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits	1,878	1,832
Regulatory liabilities, noncurrent	791	816
Asset retirement obligations, noncurrent	30	30
Non-pension postretirement benefit obligations	161	166
Other	84	88
Total deferred credits and other liabilities	2,944	2,932
Total Liabilities	8,118	8,414
Commitments and contingencies
Shareholders' equity
Common stock	3,098	2,861
Retained earnings/Undistributed earnings (losses)	2,195	2,075
Total shareholders’ equity	5,293	4,936
Members' Equity [Abstract]
Total liabilities and shareholders’ equity	13,411	13,350
Pepco Holdings LLC [Member]
Current Assets
Cash and cash equivalents	367	198
Restricted cash and cash equivalents	29	175
Accounts receivable
Customer accounts receivable	650	734
Customer allowance for credit losses	(112)	(109)
Customer accounts receivable, net	538	625
Other accounts receivable	280	300
Other allowance for credit losses	(50)	(46)
Other accounts receivable, net	230	254
Receivables from affiliates, current	2	2
Inventories, net
Fossil fuel and emission allowances	5	18
Materials and supplies	245	236
Regulatory assets, current	439	455
Other	68	96
Total current assets	1,923	2,059
Accumulated depreciation and amortization	2,757	2,618
Property, plant and equipment, net	18,003	17,686
Deferred debits and other assets
Regulatory assets, noncurrent	1,579	1,610
Goodwill	4,005	4,005
Investments	139	138
Prepaid pension asset	332	353
Other	227	231
Total deferred debits and other assets	6,282	6,337
Total assets	26,208	26,082
Current Liabilities
Short-term borrowings	0	414
Long-term debt due within one year	998	591
Accounts payable	634	771
Accrued expenses	252	260
Payables to affiliates, current	66	66
Borrowings from Exelon/PHI intercompany money pool	52	44
Customer deposits	92	88
Regulatory liabilities, current	69	76
Unamortized energy contract liabilities, current	9	10
PPA termination obligation	87	87
Other	149	330
Total current liabilities	2,408	2,737
Long-term debt	7,555	7,529
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits	2,934	2,895
Regulatory liabilities, noncurrent	976	1,011
Asset retirement obligations, noncurrent	59	59
Non-pension postretirement benefit obligations	46	50
Unamortized energy contract liabilities, noncurrent	32	35
Other	520	536
Total deferred credits and other liabilities	4,567	4,586
Total Liabilities	14,530	14,852
Commitments and contingencies
Shareholders' equity
Retained earnings/Undistributed earnings (losses)	(309)	(352)
Members' Equity [Abstract]
Membership interest	11,987	11,582
Total members' equity	11,678	11,230
Total liabilities and shareholders’ equity	26,208	26,082
Potomac Electric Power Company [Member]
Current Assets
Cash and cash equivalents	126	45
Restricted cash and cash equivalents	27	54
Accounts receivable
Customer accounts receivable	312	351
Customer allowance for credit losses	(49)	(47)
Customer accounts receivable, net	263	304
Other accounts receivable	166	180
Other allowance for credit losses	(28)	(25)
Other accounts receivable, net	138	155
Receivables from affiliates, current	1	0
Inventories, net
Inventories, net	138	135
Regulatory assets, current	248	235
Other	33	53
Total current assets	974	981
Accumulated depreciation and amortization	4,118	4,067
Property, plant and equipment, net	8,955	8,794
Deferred debits and other assets
Regulatory assets, noncurrent	424	437
Investments	121	119
Prepaid pension asset	266	273
Other	55	53
Total deferred debits and other assets	866	882
Total assets	10,795	10,657
Current Liabilities
Short-term borrowings	0	299
Long-term debt due within one year	405	4
Accounts payable	311	382
Accrued expenses	131	125
Payables to affiliates, current	38	34
Customer deposits	41	39
Regulatory liabilities, current	5	6
Merger related obligation	25	26
Other	75	93
Total current liabilities	1,031	1,008
Long-term debt	3,590	3,747
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits	1,398	1,382
Regulatory liabilities, noncurrent	435	455
Asset retirement obligations, noncurrent	39	39
Other	260	244
Total deferred credits and other liabilities	2,132	2,120
Total Liabilities	6,753	6,875
Commitments and contingencies
Shareholders' equity
Common stock	3,010	2,767
Retained earnings/Undistributed earnings (losses)	1,032	1,015
Total shareholders’ equity	4,042	3,782
Members' Equity [Abstract]
Total liabilities and shareholders’ equity	10,795	10,657
Delmarva Power and Light Company [Member]
Current Assets
Cash and cash equivalents	142	31
Restricted cash and cash equivalents	1	121
Accounts receivable
Customer accounts receivable	182	204
Customer allowance for credit losses	(26)	(21)
Customer accounts receivable, net	156	183
Other accounts receivable	48	52
Other allowance for credit losses	(8)	(7)
Other accounts receivable, net	40	45
Receivables from affiliates, current	0	0
Inventories, net
Fossil fuel and emission allowances	5	18
Materials and supplies	61	58
Regulatory assets, current	63	80
Other	30	37
Total current assets	498	573
Accumulated depreciation and amortization	1,811	1,772
Property, plant and equipment, net	4,902	4,820
Deferred debits and other assets
Regulatory assets, noncurrent	202	202
Prepaid pension asset	148	153
Other	54	54
Total deferred debits and other assets	404	409
Total assets	5,804	5,802
Current Liabilities
Short-term borrowings	0	115
Long-term debt due within one year	584	584
Accounts payable	148	172
Accrued expenses	51	41
Payables to affiliates, current	26	22
Customer deposits	30	29
Regulatory liabilities, current	49	44
Other	17	136
Total current liabilities	905	1,143
Long-term debt	1,477	1,354
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits	882	869
Regulatory liabilities, noncurrent	374	380
Asset retirement obligations, noncurrent	13	13
Non-pension postretirement benefit obligations	9	9
Other	77	84
Total deferred credits and other liabilities	1,355	1,355
Total Liabilities	3,737	3,852
Commitments and contingencies
Shareholders' equity
Common stock	1,455	1,356
Retained earnings/Undistributed earnings (losses)	612	594
Total shareholders’ equity	2,067	1,950
Members' Equity [Abstract]
Total liabilities and shareholders’ equity	5,804	5,802
Atlantic City Electric Company [Member]
Current Assets
Cash and cash equivalents	71	72
Restricted cash and cash equivalents	0	0
Accounts receivable
Customer accounts receivable	156	179
Customer allowance for credit losses	(37)	(41)
Customer accounts receivable, net	119	138
Other accounts receivable	64	70
Other allowance for credit losses	(14)	(14)
Other accounts receivable, net	50	56
Receivables from affiliates, current	2	1
Inventories, net
Inventories, net	46	43
Regulatory assets, current	114	130
Other	5	3
Total current assets	407	443
Accumulated depreciation and amortization	1,583	1,551
Property, plant and equipment, net	4,067	3,990
Deferred debits and other assets
Regulatory assets, noncurrent	492	494
Prepaid pension asset	14	18
Other	33	34
Total deferred debits and other assets	539	546
Total assets	5,013	4,979
Current Liabilities
Long-term debt due within one year	3	3
Accounts payable	167	206
Accrued expenses	46	47
Payables to affiliates, current	26	26
Customer deposits	21	21
Regulatory liabilities, current	15	26
PPA termination obligation	87	87
Other	12	58
Total current liabilities	377	474
Long-term debt	1,828	1,754
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits	742	734
Regulatory liabilities, noncurrent	148	156
Non-pension postretirement benefit obligations	7	8
Other	83	100
Total deferred credits and other liabilities	980	998
Total Liabilities	3,185	3,226
Commitments and contingencies
Shareholders' equity
Common stock	1,828	1,765
Retained earnings/Undistributed earnings (losses)	0	(12)
Total shareholders’ equity	1,828	1,753
Members' Equity [Abstract]
Total liabilities and shareholders’ equity	$ 5,013	$ 4,979

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]	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, 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									$ 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, 2022	995,830
Beginning balance at Dec. 31, 2022	$ 24,744		20,908		(123)	4,597	(638)	0
Beginning Balance at Dec. 31, 2022	24,744								13,364	1,588	2,030	9,746	5,563	3,702	1,861	4,936	2,861	2,075				3,782	2,767	1,015	1,950	1,356	594	1,753	1,765	(12)
Beginning Balance at Dec. 31, 2022																			11,230	(352)	11,582
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	$ 669					669		0	241		241		166		166	200		200	155	155		65		65	60		60	33		33
Long -Term Incentive Plan Activity (shares)	306
Long-Term Incentive Plan Activity	$ 1		1
Employee stock purchase plan issuances (shares)	266
Employee stock purchase plan issuances	$ 12		12
Common Stock, Dividends, Per Share, Declared	$ 0.36
Common stock dividends	$ (359)					(359)			(187)		(187)		(101)		(101)	(80)		(80)				(48)		(48)	(42)		(42)	(21)		(21)
Other comprehensive income (loss), net of income taxes	$ (1)						(1)
Distributions to member																			(112)	(112)
Contributions from parent									186			186	330	330		237	237		405		405	243	243		99	99		63	63
Ending balance (in shares) at Mar. 31, 2023	996,402
Ending balance at Mar. 31, 2023	$ 25,066		$ 20,921		$ (123)	$ 4,907	$ (639)	$ 0
Ending Balance at Mar. 31, 2023	$ 25,066								$ 13,604	$ 1,588	$ 2,084	$ 9,932	$ 5,958	$ 4,032	$ 1,926	$ 5,293	$ 3,098	$ 2,195				$ 4,042	$ 3,010	$ 1,032	$ 2,067	$ 1,455	$ 612	$ 1,828	$ 1,828	$ 0
Ending Balance at Mar. 31, 2023																			$ 11,678	$ (309)	$ 11,987

Significant Accounting Policies

Significant Accounting Policies (All Registrants)	3 Months Ended
Significant Accounting Policies (All Registrants)	Mar. 31, 2023
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 transmission and distribution 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, finance, engineering, customer operations, distribution and transmission planning, asset management, system operations, and power procurement, to PHI operating companies. The costs of BSC and PHISCO are directly charged or allocated to the applicable subsidiaries. The results of Exelon’s corporate operations are presented as “Other” in the consolidated financial statements and include intercompany eliminations unless otherwise disclosed. The accompanying consolidated financial statements as of March 31, 2023 and for the three months ended March 31, 2023 and 2022 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, 2022 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, 2023. 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, met 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 the three months ended March 31, 2022. See Note 2 — Discontinued Operations for additional information.

Discontinued Operations (Exelon

Discontinued Operations (Exelon)	3 Months Ended
Discontinued Operations (Exelon)	Mar. 31, 2023
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. 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 contributed its equity ownership interest in Generation to Constellation. Exelon no longer retains any equity ownership interest in Generation or Constellation. See Note 2 — Discontinued Operations of the 2022 Form 10-K 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 March 31, 2023, the amounts Exelon billed Constellation and Constellation billed Exelon for these services were $50 million recorded in Other income, net and $6 million recorded in Operating and maintenance expense, respectively. For the period from February 1, 2022 to March 31, 2022, the amounts Exelon billed Constellation and Constellation billed Exelon for these services were $56 million recorded in Other income, net and $9 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 Constellation after the separation. Prior to the separation, such expenses were primarily recorded as Purchased power from affiliates and an immaterial amount recorded as Operating and maintenance expense from affiliates at the Utility Registrants. After the separation, such expenses are primarily recorded as Purchased power and an immaterial amount recorded as Operating and maintenance expense at the Utility Registrants. • ComEd had an ICC-approved RFP contract with Constellation to provide a portion of ComEd’s electric supply requirements. ComEd also purchased RECs and ZECs from Constellation. • PECO received electric supply from Constellation under contracts executed through PECO’s competitive procurement process. In addition, PECO had a ten-year agreement with Constellation to sell solar AECs. • BGE received a portion of its energy requirements from Constellation under its MDPSC-approved market-based SOS and gas commodity programs. • Pepco received electric supply from Constellation under contracts executed through Pepco’s competitive procurement process approved by the MDPSC and DCPSC. • DPL received a portion of its energy requirements from Constellation under its MDPSC and DEPSC approved market-based SOS commodity programs. • ACE received electric supply from Constellation under contracts executed through ACE’s competitive procurement process approved by the NJBPU. ComEd and PECO also have receivables with Constellation for estimated excess funds at the end of decommissioning the Regulatory Agreement Units, such amounts are due back to ComEd and PECO, as applicable, for payment to their respective customers. See Note 3 — Regulatory Matters and Note 23 — Related Party Transactions of the 2022 Form 10-K 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. There were no results from discontinued operations for the three months ended March 31, 2023. 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 months ended March 31, 2022. 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 2022 Operating revenues Competitive business revenues $ 1,855 Competitive business revenues from affiliates 161 Total operating revenues 2,016 Operating expenses Competitive businesses purchased power and fuel 1,138 Operating and maintenance (a) 371 Depreciation and amortization 94 Taxes other than income taxes 44 Total operating expenses 1,647 Gain on sales of assets and businesses 10 Operating income 379 Other income and (deductions) Interest expense, net (20) Other, net (281) Total other (deductions) and income (301) Income before income taxes 78 Income taxes (40) Equity in losses of unconsolidated affiliates (1) Net income 117 Net income attributable to noncontrolling interests 1 Net income from discontinued operations $ 116 __________ (a) Includes transaction and transition costs related to the separation of $52 million for the three months ended March 31, 2022. There were no assets or liabilities of discontinued operations included in Exelon's Consolidated Balance Sheet as of March 31, 2023 and December 31, 2022. Constellation had net assets of $11,573 million that separated on February 1, 2022 that resulted in a reduction to Exelon's equity during the year ended December 31, 2022. Refer to the Distribution of Constellation line in Exelon's Consolidated Statement of Changes in Shareholders' Equity for further information. There were no discontinued operations included within Exelon’s Consolidated Statements of Cash Flows for the three months ended March 31, 2023. 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 three months ended March 31, 2022. Three Months Ended 2022 Non-cash items included in net income from discontinued operations: Depreciation, amortization, and accretion, including nuclear fuel and energy contract amortization $ 207 Loss on sales of assets and businesses 9 Deferred income taxes and amortization of investment tax credits (143) Net fair value changes related to derivatives (59) Net realized and unrealized losses on NDT fund investments 205 Net unrealized losses on equity investments 16 Other decommissioning-related activity 36 Cash flows from investing activities: Capital expenditures (227) Collection of DPP 169 Supplemental cash flow information: Decrease in capital expenditures not paid (128) Increase in DPP 348 Increase in PP&E related to ARO update 335

Regulatory Matters (All Registr

Regulatory Matters (All Registrants)	3 Months Ended
Regulatory Matters (All Registrants)	Mar. 31, 2023
Regulated Operations [Abstract]
Regulatory Matters (All Registrants)	Regulatory Matters (All Registrants) As discussed in Note 3 — Regulatory Matters of the 2022 Form 10-K, the Registrants are involved in rate and regulatory proceedings at FERC and their state commissions. The following discusses developments in 2023 and updates to the 2022 Form 10-K. Distribution Base Rate Case Proceedings The following tables show the completed and pending distribution base rate case proceedings in 2023. 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 15, 2022 Electric $ 199 $ 199 7.85 % November 17, 2022 January 1, 2023 PECO - Pennsylvania March 31, 2022 Natural Gas 82 55 N/A (b) October 27, 2022 January 1, 2023 BGE - Maryland (c) May 15, 2020 (amended September 11, 2020) Electric 203 140 9.50 % December 16, 2020 January 1, 2021 Natural Gas 108 74 9.65 % Pepco - Maryland (d) October 26, 2020 (amended March 31, 2021) Electric 104 52 9.55 % June 28, 2021 June 28, 2021 DPL - Maryland (e) May 19, 2022 Electric 38 29 9.60 % December 14, 2022 January 1, 2023 __________ (a) ComEd's 2023 approved revenue requirement above reflects an increase of $144 million for the initial year revenue requirement for 2023 and an increase of $55 million related to the annual reconciliation for 2021. The revenue requirement for 2023 provides for a weighted average debt and equity return on distribution rate base of 5.94%, inclusive of an allowed ROE of 7.85%, reflecting the monthly average yields for 30-year treasury bonds plus 580 basis points. The reconciliation revenue requirement for 2021 provides for a weighted average debt and equity return on distribution rate base of 5.91%, inclusive of an allowed ROE of 7.78%, reflecting the monthly yields on 30-year treasury bonds plus 580 basis points less a performance metrics penalty of 7 basis points. This is ComEd's last performance-based electric distribution formula rate update filing under EIMA. See discussion of CEJA below for details on the transition away from the electric distribution formula rate. (b) The PECO natural gas 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. BGE proposed to use certain tax benefits to fully offset the increases in 2021 and 2022 and partially offset the increase in 2023. The MDPSC awarded BGE electric revenue requirement increases of $59 million, $39 million, and $42 million, before offsets, in 2021, 2022, and 2023, respectively, and natural gas revenue requirement increases of $53 million, $11 million, and $10 million, before offsets, in 2021, 2022, and 2023, respectively. However, the MDPSC utilized the tax benefits to fully offset the increases in 2021 and January 2022 such that customer rates remained unchanged. For the remainder of 2022, the MDPSC chose to offset only 25% of the cumulative 2021 and 2022 electric revenue requirement increases and 50% of the cumulative gas revenue requirement increases. In 2021, the MDPSC deferred a decision on whether to use certain tax benefits to offset the revenue requirement increases in 2023 and directed BGE to make another proposal at the end of 2022. In September 2022 BGE proposed that tax benefits not be used to offset the 2023 revenue requirement increases. On October 26, 2022, the MDPSC accepted BGE's recommendation to not use tax benefits to offset the 2023 revenue requirement increases. (d) Reflects a 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. (e) Reflects a three-year cumulative multi-year plan for January 1, 2023 through December 31, 2025. The MDPSC awarded DPL electric incremental revenue requirement increases of $17 million, $6 million, and $6 million for 2023, 2024, and 2025, respectively. Pending Distribution Base Rate Case Proceedings Registrant/Jurisdiction Filing Date Service Requested Revenue Requirement Increase Requested ROE Expected Approval Timing ComEd - Illinois (a) January 17, 2023 Electric $ 1,472 10.50% to 10.65% Fourth quarter of 2023 ComEd - Illinois (b) April 21, 2023 Electric 247 8.91% Fourth quarter of 2023 BGE - Maryland (c) February 17, 2023 Electric 313 10.40% Fourth quarter of 2023 Natural Gas 289 10.40% Pepco - District of Columbia (d) April 13, 2023 Electric 191 10.50% First quarter of 2024 DPL - Delaware (e) December 15, 2022 (amended February 28, 2023) Electric 48 10.50% Second quarter of 2024 ACE - New Jersey (f) February 15, 2023 Electric 105 10.50% First quarter of 2024 __________ (a) Reflects a four-year cumulative MRP for January 1, 2024 to December 31, 2027 and total requested revenue requirement increases of $877 million effective January 1, 2024, $175 million effective January 1, 2025, $217 million effective January 1, 2026, and $203 million effective January 1, 2027, based on forecasted revenue requirements. The revenue requirement will provide for a weighted average debt and equity return on distribution rate base of 7.43% in 2024, 7.50% in 2025, 7.62% in 2026, and 7.70% in 2027, inclusive of an allowed ROE of 10.50% in 2024, 10.55% in 2025, 10.60% in 2026, and 10.65% in 2027. The requested revenue requirements are based on capital structures that reflect between 50.58% and 51.19% common equity. ComEd’s MRP also includes a proposed rate phase-in to defer approximately $307 million of the $877 million year-over-year increase for 2024 revenue from 2024 to 2026. (b) On April 21, 2023, ComEd filed its proposed Delivery Reconciliation Amount of $247 million un der Rider Delivery Service Pricing Reconciliation (Rider DSPR) which allows for the reconciliation of the revenue requirement in effect in the final years in which formula rates are determined and until such time as new rates are established under ComEd’s approved MRP. The 2023 filing reconciles the delivery service rates in effect in 2022 with the actual delivery service costs incurred in 2022. Final order is expected by December 2023, and the reconciliation amount will be in customer rates beginning January 1, 2024. (c) Reflects a three-year cumulative multi-year plan for January 1, 2024 through December 31, 2026 submitted to the MDPSC. Inclusive of the proposed acceleration of remaining electric tax benefits in 2024 and 2025, and remaining gas tax benefits in 2024, BGE requested total electric revenue requirement increases of $85 million, $103 million, and $125 million in 2024, 2025, and 2026, respectively, and natural gas revenue requirement increases of $158 million, $77 million, and $54 million in 2024, 2025, and 2026, respectively. Requested revenue requirement increases will be used to recover capital investments designed to increase the resilience of the electric and gas distribution systems and support Maryland’s climate and regulatory initiatives. The 2021 and 2022 reconciliation amounts are not included in the requested revenue requirement increase, as BGE is proposing that these amounts be recovered through the separate electric and gas riders in 2024. The 2021 reconciliation amounts are $11 million and $7 million for electric and gas, respectively, and the 2022 reconciliation amounts are $44 million and $15 million for electric and gas, respectively. (d) Reflects a three-year cumulative multi-year plan for January 1, 2024 through December 31, 2026 submitted to the DCPSC. Pepco requested total electric revenue requirement increases of $117 million, $37 million, and $37 million in 2024, 2025, and 2026, respectively. Requested revenue requirement increases will be used to recover capital investments designed to advance system-readiness and support the District of Columbia’s climate and clean energy goals. (e) The rates will go into effect on July 15, 2023, subject to refund. (f) Requested increases are before New Jersey sales and use tax. ACE intends to put rates into effect on November 17, 2023, subject to refund. Transmission Formula Rates The Utility Registrants' transmission rates are each established based on a FERC-approved formula. ComEd, BGE, Pepco, DPL, and ACE are required to file an annual update to the FERC-approved formula on or before May 15, and PECO is required to file on or before May 31, with the resulting rates effective on June 1 of the same year. The annual update for BGE 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 BGE also reconciles any differences between the actual costs and actual revenues for the calendar year (annual reconciliation). For 2023, the following increases/(decreases) were included in BGE's annual electric transmission formula rate updates. ComEd, PECO, Pepco, DPL, and ACE intend to file by the required deadline for the annual update. Registrant (a) Initial Revenue Requirement Increase Annual Reconciliation Decrease Total Revenue Requirement Increase Allowed Return on Rate Base (b) Allowed ROE (c) BGE $ 19 $ (12) $ 4 (d) 7.34 % 10.50 % __________ (a) All rates are effective June 1, 2023 - May 31, 2024, subject to review by interested parties pursuant to review protocols of tariffs. (b) Represents the weighted average debt and equity return on transmission rate bases. (c) The rate of return on common equity 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 $3 million reduction related to a FERC-approved dedicated facilities charge to recover the costs of providing transmission service to specifically designated load by BGE. Other State Regulatory Matters Illinois Regulatory Matters CEJA (Exelon and ComEd). On September 15, 2021, the Governor of Illinois signed into law CEJA. CEJA includes, among other features, (1) procurement of CMCs from qualifying nuclear-powered generating facilities, (2) a requirement to file a general rate case or a new four-year MRP no later than January 20, 2023 to establish rates effective after ComEd’s existing performance-based distribution formula rate sunsets, (3) an extension of and certain adjustments to ComEd’s energy efficiency MWh savings goals, (4) revisions to the Illinois RPS requirements, including expanded charges for the procurement of RECs from wind and solar generation, (5) a requirement to accelerate amortization of ComEd’s unprotected excess deferred income taxes (EDIT) that ComEd was previously directed by the ICC to amortize using the average rate assumption method which equates to approximately 39.5 years, and (6) requirements that ComEd and the ICC initiate and conduct various regulatory proceedings on subjects including ethics, spending, grid investments, and performance metrics. Regulatory or legal challenges regarding the validity or implementation of CEJA are possible and Exelon and ComEd cannot reasonably predict the outcome of any such challenges. ComEd Electric Distribution Rates ComEd filed, and received approval for, its last performance-based electric distribution formula rate update filing under EIMA in 2022; those rates are in effect throughout 2023. On February 3, 2022, the ICC approved a tariff that establishes the process under which ComEd will reconcile its 2022 and 2023 rate year revenue requirements with actual costs. Those reconciliation amounts will be determined using the same process as were used for prior reconciliations under the performance-based electric distribution formula rate. Using that process, for the rate years 2022 and 2023 ComEd will ultimately collect revenues from customers reflecting each year’s actual recoverable costs, year-end rate base, and a weighted average debt and equity return on distribution rate base, with the ROE component based on the annual average of the monthly yields of the 30-year U.S. Treasury bonds plus 580 basis points. In April 2023, ComEd filed its first petition with the ICC to reconcile its 2022 actual costs with the approved revenue requirement that was in effect in 2022. The rate year 2023 reconciliation will be filed in 2024. Beginning in 2024, ComEd will recover from retail customers, subject to certain exceptions, the costs it incurs to provide electric delivery services either through its electric distribution rate or other recovery mechanisms authorized by CEJA. On January 17, 2023, ComEd filed a petition with the ICC seeking approval of a MRP for 2024-2027. The MRP supports a multi-year grid plan (Grid Plan), also filed on January 17, covering planned investments on the electric distribution system within ComEd’s service area through 2027. Costs incurred during each year of the MRP are subject to ICC review and the plan’s revenue requirement for each year will be reconciled with the actual costs that the ICC determines are prudently and reasonably incurred for that year. The reconciliation is subject to adjustment for certain costs, including a limitation on recovery of costs that are more than 105% of certain costs in the previously approved MRP revenue requirement, absent a modification of the rate plan itself. Thus, for example, the rate adjustments necessary to reconcile 2024 revenues to ComEd’s actual 2024 costs incurred would take effect in January 2026 after the ICC’s review during 2025. The ICC must issue its decision on both the MRP and Grid Plan by mid-December 2023, for rates to begin with the January 2024 billing cycle. In January 2022, ComEd filed a request with the ICC proposing performance metrics that would be used in determining ROE incentives and penalties in the event ComEd filed a MRP in January 2023. On September 27, 2022, the ICC issued a final order approving seven performance metrics that provide symmetrical performance adjustments of 32 total basis points to ComEd’s rate of return on common equity based on the extent to which ComEd achieves the annual performance goals. On November 10, 2022, the ICC granted ComEd's application for rehearing, in part. On April 5, the ICC issued its final order on rehearing for the performance and tracking metrics proceeding, in which the ICC declined to adopt ComEd’s proposed modifications to the reliability and peak load reduction performance metrics. ComEd is determining how to implement the performance metrics, which take effect on January 1, 2024. ComEd will make its initial filing in 2025 to assess performance achieved under the metrics in 2024, and to determine any ROE adjustment, which would take effect in 2026. Carbon Mitigation Credit CEJA establishes decarbonization requirements for Illinois as well as programs to support the retention and development of emissions-free sources of electricity. ComEd is required to purchase CMCs from participating nuclear-powered generating facilities between June 1, 2022 and May 31, 2027. The price to be paid for each CMC was established through a competitive bidding process that included consumer-protection measures that capped the maximum acceptable bid amount and a formula that reduces CMC prices by an energy price index, the base residual auction capacity price in the ComEd zone of PJM, and the monetized value of any federal tax credit or other subsidy if applicable. The consumer protection measures contained in CEJA will result in net payments to ComEd ratepayers if the energy index, the capacity price and applicable federal tax credits or subsidy exceed the CMC contract price. ComEd began issuing credits to its retail customers under its new CMC rider in the June 2022 billing period and recorded a regulatory asset of $1,118 million as of March 31, 2023 for the difference between customer credits issued and the credit to be received from the participating nuclear-powered generating facilities. Under CEJA, the costs of procuring CMCs, including carrying costs, will be recovered through a rider, the Rider Carbon-Free Resource Adjustment (Rider CFRA). The Rider CFRA provides for an annual reconciliation and true-up to actual costs incurred or credits received by ComEd to purchase CMCs, with any difference to be credited to or collected from ComEd’s retail customers in subsequent periods. The difference between the net payments to (or receivables from) ComEd ratepayers and the credits received by ComEd to purchase CMCs is recorded to Purchased Power expense with an offset to the regulatory asset (or regulatory liability). On December 21, 2022, ComEd filed a supplemental statement to the Rider CFRA proposing that the company recover costs or provide credits faster than the tariff allows, implement monthly reconciliations, and allow the Company to adjust Rider CFRA rates based not only on anticipated differences but also past payments or credits. The ICC approved the proposal on January 19, 2023. 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 (EV), such as upfront technology adoption costs, charging costs, and charging availability; promote equity and environmental justice; reduce carbon emissions and surface-level pollutants; and support customer education and awareness of electrification options. As proposed, ComEd could expend approximately $300 million in total over the three-year period 2023 through 2025. The beneficial electrification plan requests recovery of all those costs through a rider mechanism, under which certain of the costs would be amortized over ten years with a return on the unrecovered balance. On November 10, 2022, in responses to a Staff motion, the ICC approved an interim order dismissing from ComEd’s Beneficial Electrification Plan certain rebates (rebates to support residential customers’ purchase of EVs; and rebates to ComEd’s commercial and industrial customers to support the installation of EV chargers). However, the ICC found that building electrification measures were properly within the scope of beneficial electrification, in line with ComEd’s proposal. The ICC also adopted ComEd’s position regarding the rate impact of spending associated with EV related infrastructure. On November 21, 2022, ComEd filed an application for rehearing of the interim order, which the ICC denied. On December 9, 2022, the Office of the Illinois Attorney General (AG) also sought rehearing. On December 15, 2022, ComEd filed an appeal of the ICC’s interim order and the denial of rehearing with the Illinois Appellate Court. That appeal has been stayed pending the ICC's disposition of the case. Also on December 15, 2022, the ICC denied the AG’s application for rehearing and the AG subsequently filed an appeal. On March 23, 2023, the ICC issued its final order in the beneficial electrification plan docket. The order adopts the beneficial electrification plan with modifications and directs ComEd to seek cost recovery through the multi-year rate plan filing for 2024 and 2025, and the final formula rate reconciliation docket for 2023, rather than through a new rider beneficial electrification as ComEd had proposed. The order also rejects ComEd’s request for a regulatory asset. The order approves an overall annual budget of $77 million per year for each of the three years in the plan (2023 through 2025), with flexibility to roll forward unused funds to future years within the same plan period. The final order also made specific reductions to the proposed $100 million per year budget, reducing the proposed customer education and awareness budget; the portfolio budget for cross-cutting administrative support; and the light, medium, and heavy-duty EV rebate programs. The order dedicates funds for rebates related to the installation of heat pumps and the promotion of home electrification for low-income customers and those in Environmental Justice and Restore, Reinvest, and Renew designated communities. The order also requires ComEd to propose methods to minimize or exempt low-income ratepayers from the impact of its beneficial electrification plan, possibly through ComEd’s next rate design investigation. On April 18, 2023, ComEd filed an application for rehearing concerning aspects of the ICC’s order, including the approved budgets. The ICC must act on that application by May 8, 2023. On April 21, 2023 the Chicago Transit Authority and city of Chicago jointly filed an application for rehearing requesting the ICC modify the final order so the transit agencies do not pay the cost of make-ready infrastructure and to exempt transit agencies from paying the required deposit or providing a letter of credit to ComEd for the cost of make-ready infrastructure. On April 24, 2023, the AG also filed an application for rehearing on several topics, including the budget, rebate levels, retail rate cap, types of programs included in the beneficial electrification plan, compliance with the EV Act, benefit-to-cost analysis, and rate-related issues. On April 27, 2023, ICC staff filed a motion for clarification of the order’s language regarding the annual budget. The ICC will likely rule on all of the applications for rehearing and staff’s motion at their regularly scheduled May 4, 2023 regular open meeting. If the ICC denies rehearing, parties have 35 days to appeal arguments raised in their rehearing applications. 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 March 31, 2023, the $118 million liability for the contract termination fee consists of $87 million and $31 million included in Other current liabilities and Other deferred credits and other liabilities, respectively, in Exelon's Consolidated Balance Sheet. The current and noncurrent liabilities are included in PPA termination obligation and Other deferred credits and other liabilities, respectively, in PHI's and ACE's Consolidated Balance Sheets. For the three months ended March 31, 2023, ACE has paid $19 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. Other Federal Regulatory Matters FERC Audit (Exelon and ComEd). The Utility Registrants are subject to periodic audits by FERC. FERC’s Division of Audits and Accounting initiated a nonpublic audit of ComEd in May 2021 evaluating ComEd’s compliance with (1) approved terms, rates and conditions of its federally regulated service; (2) accounting requirements of the Uniform System of Accounts; (3) reporting requirements of the FERC Form 1; and (4) the requirements for record retention. The audit covered the period from January 1, 2017 through August 31, 2022. On January 17 and February 21, 2023, ComEd was provided with information on a series of potential findings, including concerning ComEd's methodology regarding the allocation of certain overhead costs to capital under FERC regulations. As of March 31, 2023, ComEd has continued discussions with FERC staff and determined that a loss is probable and has recorded a liability that reflects management's best estimate. The final outcome and resolution of the findings or of the audit itself cannot be predicted and the results could be material to the Exelon and ComEd financial statements. Regulatory Assets and Liabilities The Utility Registrants' regulatory assets and liabilities have not changed materially since December 31, 2022, unless noted below. See Note 3 — Regulatory Matters of the 2022 Form 10-K for additional information on the specific regulatory assets and liabilities. ComEd. Regulatory assets increased $547 million primarily due to increases of $275 million in the CMC regulatory asset, as discussed in CEJA above, and $143 million in the Electric Distribution Formula Rate Annual Reconciliations regulatory asset. PECO. Regulatory assets increased $44 million primarily due to an increase of $48 million in the Deferred Income Taxes regulatory asset. Regulatory liabilities increased $45 million primarily due to increases of $31 million in the Electric Energy and Natural Gas Costs regulatory liability and $28 million in the Decommissioning the Regulatory Agreement Units regulatory liability. BGE. Regulatory assets increased $66 million primarily due to an increase of $54 million in the Under-Recovered Revenue Decoupling regulatory asset. DPL . Regulatory assets decreased $17 million primarily due to a decrease of $18 million in the Electric Energy and Natural Gas Costs regulatory asset. ACE. Regulatory assets decreased $18 million primarily due to a decrease of $35 million in the Electric Energy Costs regulatory asset as a result of the PPA termination. Regulatory liabilities decreased $19 million primarily due to a $9 million decrease in the Over-Recovered Revenue Decoupling 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. PECO had no related amounts as of March 31, 2023 and December 31, 2022. Exelon ComEd (a) BGE (b) PHI Pepco (c) DPL (c) ACE (b) March 31, 2023 $ 53 $ 13 $ 26 $ 14 $ 11 $ 2 $ 1 December 31, 2022 57 8 28 21 18 2 1 __________ (a) Reflects ComEd's unrecognized equity returns earned for ratemaking purposes on its electric distribution formula rate regulatory assets. (b) BGE's and ACE's authorized amounts capitalized for ratemaking purposes primarily relate to earnings on shareholder's investment on their respective 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)	3 Months Ended
Revenue from Contracts with Customers (All Registrants)	Mar. 31, 2023
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 2022 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 deferred credits and other 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 months ended March 31, 2023 and 2022. As of March 31, 2023 and December 31, 2022, ComEd's, PECO's, and BGE's contract liabilities were immaterial. Exelon (a) PHI (a) Pepco (a) DPL ACE Balance as of December 31, 2022 $ 101 $ 101 $ 81 $ 10 $ 10 Revenues recognized (1) (1) (1) — — Balance as of March 31, 2023 $ 100 $ 100 $ 80 $ 10 $ 10 Exelon (a) PHI (a) Pepco (a) DPL ACE 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 __________ (a) Revenues recognized in the three months ended March 31, 2023 and 2022, were included in the contract liabilities at December 31, 2022 and 2021, 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 March 31, 2023. 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. Year Exelon PHI Pepco DPL ACE 2023 $ 7 $ 7 $ 5 $ 1 $ 1 2024 6 6 5 — 1 2025 5 5 5 — — 2026 5 5 5 — — 2027 and thereafter 77 77 60 9 8 Total $ 100 $ 100 $ 80 $ 10 $ 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 Registrants' revenue disaggregation.

Segment Information (All Regist

Segment Information (All Registrants)	3 Months Ended
Segment Information (All Registrants)	Mar. 31, 2023
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 the segments 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 months ended March 31, 2023 and 2022 is as follows: ComEd PECO BGE PHI Other (a) Intersegment Exelon Operating revenues (b) : 2023 Electric revenues $ 1,667 $ 795 $ 814 $ 1,436 $ — $ (5) $ 4,707 Natural gas revenues — 317 443 97 — (1) 856 Shared service and other revenues — — — 3 437 (440) — Total operating revenues $ 1,667 $ 1,112 $ 1,257 $ 1,536 $ 437 $ (446) $ 5,563 2022 Electric revenues $ 1,734 $ 741 $ 736 $ 1,318 $ — $ (7) $ 4,522 Natural gas revenues — 306 418 83 — (2) 805 Shared service and other revenues — — — 3 576 (579) — Total operating revenues $ 1,734 $ 1,047 $ 1,154 $ 1,404 $ 576 $ (588) $ 5,327 Intersegment revenues (c) : 2023 $ 3 $ 2 $ 3 $ 3 $ 434 $ (445) $ — 2022 6 1 7 3 576 (587) 6 Depreciation and amortization: 2023 $ 338 $ 98 $ 167 $ 241 $ 16 $ — $ 860 2022 321 92 171 218 15 — 817 Operating expenses: 2023 $ 1,256 $ 902 $ 964 $ 1,297 $ 485 $ (447) $ 4,457 2022 1,406 793 919 1,215 625 (531) 4,427 Interest expense, net: 2023 $ 117 $ 48 $ 44 $ 76 $ 127 $ — $ 412 2022 100 41 35 69 93 — 338 Income (loss) from continuing operations before income taxes: 2023 $ 312 $ 170 $ 252 $ 189 $ (120) $ — $ 803 2022 240 220 207 137 (62) (43) 699 Income taxes: 2023 $ 71 $ 4 $ 52 $ 34 $ (27) $ — $ 134 2022 52 14 9 7 146 (10) 218 Net income (loss) from continuing operations: 2023 $ 241 $ 166 $ 200 $ 155 $ (93) $ — $ 669 2022 188 206 198 130 (208) (33) 481 Capital expenditures: 2023 $ 617 $ 335 $ 350 $ 561 $ 18 $ — $ 1,881 2022 617 344 303 409 22 — 1,695 Total assets: March 31, 2023 $ 40,720 $ 14,738 $ 13,411 $ 26,208 $ 6,042 $ (4,194) $ 96,925 December 31, 2022 39,661 14,502 13,350 26,082 6,014 (4,260) 95,349 __________ (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 15 — Supplemental Financial Information for additional information on total utility taxes. (c) See Note 16 — Related Party Transactions for additional information on intersegment revenues. PHI: Pepco DPL ACE Other (a) Intersegment PHI Operating revenues (b) : 2023 Electric revenues $ 710 $ 377 $ 353 $ — $ (4) $ 1,436 Natural gas revenues — 97 — — — 97 Shared service and other revenues — — — 102 (99) 3 Total operating revenues $ 710 $ 474 $ 353 $ 102 $ (103) $ 1,536 2022 Electric revenues $ 614 $ 348 $ 349 $ — $ 7 $ 1,318 Natural gas revenues — 83 — — — 83 Shared service and other revenues — — — 107 (104) 3 Total operating revenues $ 614 $ 431 $ 349 $ 107 $ (97) $ 1,404 Intersegment revenues (c) : 2023 $ 1 $ 2 $ 1 $ 102 $ (103) $ 3 2022 1 1 1 97 (97) 3 Depreciation and amortization: 2023 $ 108 $ 60 $ 67 $ 6 $ — $ 241 2022 108 57 47 6 — 218 Operating expenses: 2023 $ 610 $ 388 $ 298 $ 104 $ (103) $ 1,297 2022 547 357 311 97 (97) 1,215 Interest expense, net: 2023 $ 39 $ 17 $ 16 $ 4 $ — $ 76 2022 36 16 14 3 — 69 Income (loss) before income taxes: 2023 $ 77 $ 72 $ 44 $ (4) $ — $ 189 2022 44 60 27 6 — 137 Income taxes: 2023 $ 12 $ 12 $ 11 $ (1) $ — $ 34 2022 (2) 4 1 4 — 7 Net income (loss): 2023 $ 65 $ 60 $ 33 $ (3) $ — $ 155 2022 46 56 26 2 — 130 Capital expenditures: 2023 $ 264 $ 134 $ 161 $ 2 $ — $ 561 2022 218 103 87 1 — 409 Total assets: March 31, 2023 $ 10,795 $ 5,804 $ 5,013 $ 4,638 $ (42) $ 26,208 December 31, 2022 10,657 5,802 4,979 4,677 (33) 26,082 __________ (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 15 — Supplemental Financial Information for additional information on total utility taxes. (c) Includes intersegment revenues with ComEd, BGE, and PECO, which are eliminated at Exelon. Electric and Gas Revenue by Customer Class (Utility Registrants): 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 March 31, 2023 Revenues from contracts with customers ComEd PECO BGE PHI Pepco DPL ACE Electric revenues Residential $ 836 $ 519 $ 434 $ 639 $ 283 $ 210 $ 146 Small commercial & industrial 361 135 92 160 39 62 59 Large commercial & industrial 84 65 149 378 282 33 63 Public authorities & electric railroads 10 8 7 17 8 4 5 Other (a) 217 68 96 176 56 58 63 Total electric revenues (b) $ 1,508 $ 795 $ 778 $ 1,370 $ 668 $ 367 $ 336 Natural gas revenues Residential $ — $ 223 $ 278 $ 60 $ — $ 60 $ — Small commercial & industrial — 75 41 26 — 26 — Large commercial & industrial — 1 70 1 — 1 — Transportation — 8 — 4 — 4 — Other (c) — 9 19 6 — 6 — Total natural gas revenues (d) $ — $ 316 $ 408 $ 97 $ — $ 97 $ — Total revenues from contracts with customers $ 1,508 $ 1,111 $ 1,186 $ 1,467 $ 668 $ 464 $ 336 Other revenues Revenues from alternative revenue programs $ 153 $ (4) $ 65 $ 65 $ 39 $ 9 $ 17 Other electric revenues (e) 6 4 4 4 3 1 — Other natural gas revenues (e) — 1 2 — — — — Total other revenues $ 159 $ 1 $ 71 $ 69 $ 42 $ 10 $ 17 Total revenues for reportable segments $ 1,667 $ 1,112 $ 1,257 $ 1,536 $ 710 $ 474 $ 353 Three Months Ended March 31, 2022 Revenues from contracts with customers ComEd PECO BGE PHI Pepco DPL ACE Electric revenues Residential $ 857 $ 487 $ 417 $ 652 $ 275 $ 207 $ 170 Small commercial & industrial 423 111 81 141 38 56 47 Large commercial & industrial 153 64 131 323 253 26 44 Public authorities & electric railroads 14 8 7 16 8 4 4 Other (a) 239 62 97 193 46 56 81 Total electric revenues (b) $ 1,686 $ 732 $ 733 $ 1,325 $ 620 $ 349 $ 346 Natural gas revenues Residential $ — $ 218 $ 282 $ 51 $ — $ 51 $ — Small commercial & industrial — 76 45 21 — 21 — Large commercial & industrial — — 65 3 — 3 — Transportation — 8 — 4 — 4 — Other (c) — 3 35 4 — 4 — Total natural gas revenues (d) $ — $ 305 $ 427 $ 83 $ — $ 83 $ — Total revenues from contracts with customers $ 1,686 $ 1,037 $ 1,160 $ 1,408 $ 620 $ 432 $ 346 Other revenues Revenues from alternative revenue programs $ 40 $ 6 $ (12) $ (5) $ (7) $ (1) $ 3 Other electric revenues (e) 8 3 4 1 1 — — Other natural gas revenues (e) — 1 2 — — — — Total other revenues $ 48 $ 10 $ (6) $ (4) $ (6) $ (1) $ 3 Total revenues for reportable segments $ 1,734 $ 1,047 $ 1,154 $ 1,404 $ 614 $ 431 $ 349 __________ (a) Includes revenues from transmission revenue from PJM, wholesale electric revenue and mutual assistance revenue. (b) Includes operating revenues from affiliates in 2023 and 2022 respectively of: • $3 million, $6 million at ComEd • $1 million, $1 million at PECO • $2 million, $2 million at BGE • $3 million, $3 million at PHI • $1 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 2023 and 2022 respectively of: • $1 million, less than a $1 million at PECO • $1 million, $6 million at BGE (e) Includes late payment charge revenues.

Accounts Receivable (All Regist

Accounts Receivable (All Registrants)	3 Months Ended
Accounts Receivable (All Registrants)	Mar. 31, 2023
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 March 31, 2023 Exelon ComEd PECO BGE PHI Pepco DPL ACE Balance as of December 31, 2022 $ 327 $ 59 $ 105 $ 54 $ 109 $ 47 $ 21 $ 41 Plus: Current period provision for expected credit losses (a) 108 22 39 30 17 9 7 1 Less: Write-offs, net of recoveries (b) 46 7 14 11 14 7 2 5 Balance as of March 31, 2023 $ 389 $ 74 $ 130 $ 73 $ 112 $ 49 $ 26 $ 37 Three Months Ended March 31, 2022 Exelon ComEd PECO BGE PHI Pepco DPL ACE Balance as of December 31, 2021 $ 320 $ 73 $ 105 $ 38 $ 104 $ 37 $ 18 $ 49 Plus: Current period provision for expected credit losses 110 26 31 26 27 11 7 9 Less: Write-offs, net of recoveries 41 7 11 5 18 8 1 9 Balance as of March 31, 2022 $ 389 $ 92 $ 125 $ 59 $ 113 $ 40 $ 24 $ 49 __________ (a) For PECO and BGE, the change in current period provision for expected credit losses is primarily a result of increased aging of receivables. (b) Recoveries were not material to the Registrants. The following tables present the rollforward of Allowance for Credit Losses on Other Accounts Receivable. Three Months Ended March 31, 2023 Exelon ComEd PECO BGE PHI Pepco DPL ACE Balance as of December 31, 2022 $ 82 $ 17 $ 9 $ 10 $ 46 $ 25 $ 7 $ 14 Plus: Current period provision for expected credit losses 14 2 3 4 5 3 1 1 Less: Write-offs, net of recoveries (a) 5 1 1 2 1 — — 1 Balance as of March 31, 2023 $ 91 $ 18 $ 11 $ 12 $ 50 $ 28 $ 8 $ 14 Three Months Ended March 31, 2022 Exelon ComEd PECO BGE PHI Pepco DPL ACE Balance as of December 31, 2021 $ 72 $ 17 $ 7 $ 9 $ 39 $ 16 $ 8 $ 15 Plus: Current period provision for expected credit losses 14 4 3 3 4 2 1 1 Less: Write-offs, net of recoveries 5 1 1 1 2 — — 2 Balance as of March 31, 2022 $ 81 $ 20 $ 9 $ 11 $ 41 $ 18 $ 9 $ 14 __________ (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 March 31, 2023 and December 31, 2022. Unbilled customer revenues (a) Exelon ComEd PECO BGE PHI Pepco DPL ACE March 31, 2023 $ 709 $ 237 $ 149 $ 149 $ 174 $ 74 $ 49 $ 51 December 31, 2022 912 223 219 247 223 103 74 46 __________ (a) Unbilled customer revenues are classified in Customer accounts receivable, 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 Three months ended March 31, 2023 $ 1,108 $ 240 $ 309 $ 245 $ 314 $ 210 $ 56 $ 48 Three months ended March 31, 2022 1,044 248 292 222 282 174 57 51 __________

Income Taxes (All Registrants)

Income Taxes (All Registrants)	3 Months Ended
Income Taxes (All Registrants)	Mar. 31, 2023
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 March 31, 2023 (a) Exelon ComEd PECO (b) BGE PHI Pepco DPL ACE 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 6.0 7.9 (1.4) 6.4 6.0 5.4 6.3 6.9 Plant basis differences (4.0) (0.3) (15.2) (0.7) (1.8) (2.5) (1.0) (0.9) Excess deferred tax amortization (6.3) (5.7) (2.4) (5.4) (7.0) (8.4) (8.8) (2.0) Amortization of investment tax credit, including deferred taxes on basis difference (0.1) (0.1) — (0.1) (0.1) — (0.1) (0.1) Tax credits (0.5) (0.3) — (0.5) (0.4) (0.4) (0.4) (0.3) Other 0.6 0.3 0.4 (0.1) 0.3 0.5 (0.3) 0.4 Effective income tax rate 16.7 % 22.8 % 2.4 % 20.6 % 18.0 % 15.6 % 16.7 % 25.0 % Three Months Ended March 31, 2022 (a) Exelon ComEd PECO (c) BGE (c) PHI Pepco (c) DPL ACE (c) 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 (d) 21.1 8.0 (0.1) 2.4 3.7 (4.5) 6.2 6.8 Plant basis differences (3.6) (0.6) (11.3) (0.9) (1.6) (2.6) (0.7) (1.3) Excess deferred tax amortization (11.5) (6.3) (3.2) (17.6) (17.7) (17.4) (19.4) (22.2) 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 (e) 1.7 (0.3) — (0.4) (0.4) (0.4) (0.3) (0.3) Other (f) 2.6 — — (0.1) 0.2 (0.6) 0.1 (0.1) Effective income tax rate 31.2 % 21.7 % 6.4 % 4.3 % 5.1 % (4.5) % 6.7 % 3.7 % __________ (a) Positive percentages represent income tax expense. Negative percentages represent income tax benefit. (b) For PECO, the lower effective tax rate is primarily related to plant basis differences attributable to tax repair deductions. (c) 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 related to the acceleration of certain income tax benefits due to distribution rate case settlements. (d) 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 approximately $67 million and the recognition of a valuation allowance of approximately $40 million against the net deferred tax asset position for certain standalone state filing jurisdiction as a result of the separation. (e) For Exelon, reflects the income tax expense related to the write-off of federal tax credits subject to recapture of approximately $15 million as a result of the separation. (f) For Exelon, primarily reflects the nondeductible transaction costs of approximately $19 million arising as part of the separation. Unrecognized Tax Benefits Exelon, PHI and ACE have the following unrecognized tax benefits as of March 31, 2023 and December 31, 2022. ComEd's, PECO's, BGE's, Pepco's, and DPL's amounts are not material. Exelon (a) PHI ACE March 31, 2023 $ 148 $ 59 $ 17 December 31, 2022 148 59 17 __________ (a) As of March 31, 2023 and December 31, 2022, Exelon recorded a receivable of $50 million in Other deferred debits and 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 March 31, 2023, 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 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 of March 31, 2023, Exelon recorded a payable of $18 million in Other current liabilities that is due to Constellation. Tax Refunds. The TMA specifies that Constellation is entitled to their share of any future tax refunds claimed by Exelon with respect to taxable periods prior to the separation to the extent that Constellation would have received such tax refunds under the existing Exelon tax sharing agreement. Tax Attributes . At the date of separation certain tax attributes, primarily pre-closing tax credit carryforwards, that were generated by Constellation were required by law to be allocated to Exelon. The TMA provides that Exelon will reimburse Constellation when those allocated tax credit carryforwards are utilized. As of March 31, 2023, Exelon recorded a payable of $212 million and $319 million in Other current liabilities and Other deferred credits and other liabilities, respectively, in the Consolidated Balance Sheet for tax attribute carryforwards that are expected to be utilized and reimbursed to Constellation. Corporate Alternative Minimum Tax (All Registrants) On August 16, 2022, the IRA was signed into law and implements a new corporate alternative minimum tax (CAMT) that imposes a 15.0% tax on modified GAAP net income. Corporations are entitled to a tax credit (minimum tax credit) to the extent the CAMT liability exceeds the regular tax liability. This amount can be carried forward indefinitely and used in future years when regular tax exceeds the CAMT.

Retirement Benefits (All Regist

Retirement Benefits (All Registrants)	3 Months Ended
Retirement Benefits (All Registrants)	Mar. 31, 2023
Retirement Benefits [Abstract]
Retirement Benefits (All Registrants)	Retirement Benefits (All Registrants) Defined Benefit Pension and OPEB The majority of the 2023 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 5.53%. The majority of the 2023 OPEB cost is calculated using an expected long-term rate of return on plan assets of 6.50% for funded plans and a discount rate of 5.51%. During the first quarter of 2023, Exelon received an updated valuation of its pension and OPEB to reflect actual census data as of January 1, 2023. This valuation resulted in an increase to the pension obligation of $27 million and an increase to the OPEB obligation of $2 million. Additionally, AOCI increased by $10 million (after-tax) and regulatory assets and liabilities increased by $18 million and $1 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 months ended March 31, 2023 and 2022. Pension Benefits OPEB Three Months Ended March 31, Three Months Ended March 31, 2023 2022 2023 2022 Components of net periodic benefit cost: Service cost $ 39 $ 61 $ 6 $ 10 Interest cost 145 110 25 19 Expected return on assets (189) (209) (21) (25) Amortization of: Prior service cost (credit) 1 1 (2) (5) Actuarial loss 41 76 — 4 Net periodic benefit cost $ 37 $ 39 $ 8 $ 3 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, which apply multi-employer accounting, 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 March 31, Pension and OPEB Costs (Benefit) 2023 2022 Exelon $ 45 $ 42 ComEd 6 16 PECO (3) (2) BGE 14 11 PHI 24 13 Pepco 8 2 DPL 4 1 ACE 4 3 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 allows employees to contribute a portion of their pre-tax and/or after-tax income in accordance with specified guidelines. All Registrants match a percentage of the employee contributions up to certain limits. The following table presents the employer contributions and employer matching contributions to the savings plan for the three months ended March 31, 2023 and 2022. Three Months Ended March 31, Savings Plan Employer Contributions 2023 2022 Exelon $ 21 $ 20 ComEd 9 8 PECO 3 3 BGE 2 2 PHI 3 3 Pepco 1 1 DPL 1 1 ACE — —

Derivative Financial Instrument

Derivative Financial Instruments (All Registrants)	3 Months Ended
Derivative Financial Instruments (All Registrants)	Mar. 31, 2023
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments (All Registrants)	Derivative Financial Instruments (All Registrants) The Registrants use derivative instruments to manage commodity price risk and interest rate risk related to ongoing business operations. The Registrants do not execute derivatives for speculative or proprietary trading purposes. Authoritative guidance requires that derivative instruments be recognized as either assets or liabilities at fair value, with changes in fair value of the derivative recognized in earnings immediately. Other accounting treatments are available through special election and designation, provided they meet specific, restrictive criteria both at the time of designation and on an ongoing basis. These alternative permissible accounting treatments include NPNS, cash flow hedges, and fair value hedges. At ComEd, derivative economic hedges related to commodities are recorded at fair value and offset by a corresponding regulatory asset or liability. At Exelon, derivative economic hedges related to interest rates are recorded at fair value and offsets are recorded to Electric operating revenues or Interest expense based on the activity the transaction is economically hedging. For all NPNS derivative instruments, accounts receivable or accounts payable are recorded when derivatives settle and revenue or expense is recognized in earnings as the underlying physical commodity is sold or consumed. At Exelon, derivative hedges that qualify and are designated as cash flow hedges are recorded at fair value and offsets are recorded to AOCI. ComEd’s use of cash collateral is generally unrestricted unless ComEd is downgraded below investment grade. Cash collateral held by PECO, BGE, Pepco, DPL, and ACE must be deposited in an unaffiliated major U.S. commercial bank or foreign bank with a U.S. branch office that meets certain qualifications. Commodity Price Risk The Registrants employ established policies and procedures to manage their risks associated with market fluctuations in commodity prices by entering into physical and financial derivative contracts, which are either determined to be non-derivative or classified as economic hedges. The Utility Registrants procure electric and natural gas supply through a competitive procurement process approved by each of the respective state utility commissions. The Utility Registrants’ hedging programs are intended to reduce exposure to energy and natural gas price volatility and have no direct earnings impact as the costs are fully recovered from customers through regulatory-approved recovery mechanisms. The following table provides a summary of the Utility Registrants’ primary derivative hedging instruments, listed by commodity and accounting treatment. Registrant Commodity Accounting Treatment Hedging Instrument ComEd Electricity NPNS Fixed price contracts based on all requirements in the IPA procurement plans. Electricity Changes in fair value of economic hedge recorded to an offsetting regulatory asset or liability (a) 20-year floating-to-fixed energy swap contracts beginning June 2012 based on the renewable energy resource procurement requirements in the Illinois Settlement Legislation of approximately 1.3 million MWhs per year. PECO Electricity NPNS Fixed price contracts for default supply requirements through full requirements contracts. Gas NPNS Fixed price contracts to cover about 10% of planned natural gas purchases in support of projected firm sales. BGE Electricity NPNS Fixed price contracts for all SOS requirements through full requirements contracts. Gas NPNS Fixed price contracts for between 10-20% of forecasted system supply requirements for flowing (i.e., non-storage) gas for the November through March period. Pepco Electricity NPNS Fixed price contracts for all SOS requirements through full requirements contracts. DPL Electricity NPNS Fixed price contracts for all SOS requirements through full requirements contracts. Gas NPNS Fixed and index priced contracts through full requirements contracts. Gas Changes in fair value of economic hedge recorded to an offsetting regulatory asset or liability (b) Exchange traded future contracts for up to 50% of estimated monthly purchase requirements each month, including purchases for storage injections. ACE Electricity NPNS Fixed price contracts for all BGS requirements through full requirements contracts. __________ (a) See Note 3 — Regulatory Matters of the 2022 Form 10-K for additional information. (b) The fair value of the DPL economic hedge is not material as of March 31, 2023 and December 31, 2022. The fair value of derivative economic hedges is presented in Other current assets and current and noncurrent Mark-to-market derivative liabilities in Exelon's and ComEd's Consolidated Balance Sheets. Interest Rate and Other Risk (Exelon) Exelon Corporate uses a combination of fixed-rate and variable-rate debt to manage interest rate exposure. Exelon Corporate may utilize interest rate derivatives to lock in rate levels in anticipation of future financings, which are typically designated as cash flow hedges. In addition, Exelon Corporate may also utilize interest rate swaps to manage interest rate exposure and manage potential fluctuations in Electric operating revenues at the corporate level in consolidation, which are directly correlated to yields on U.S. Treasury bonds under ComEd's distribution formula rate. These interest rate swaps are accounted for as economic hedges. A hypothetical 50 basis point change in the interest rates associated with Exelon's interest rate swaps as of March 31, 2023 would result in an immaterial impact to Exelon's Consolidated Net Income. Below is a summary of the interest rate hedge balances as of March 31, 2023 and December 31, 2022 . March 31, 2023 Derivatives Designated Economic Hedges Total Other deferred debits (noncurrent assets) $ — $ 3 $ 3 Total derivative assets — 3 3 Mark-to-market derivative liabilities (current liabilities) — (1) (1) Mark-to-market derivative liabilities (noncurrent liabilities) (1) — (1) Total mark-to-market derivative liabilities (1) (1) (2) Total mark-to-market derivative net assets $ (1) $ 2 $ 1 December 31, 2022 Derivatives Designated Economic Hedges Total Other deferred debits (noncurrent assets) $ 6 $ 5 $ 11 Total derivative assets 6 5 11 Mark-to-market derivative liabilities (current liabilities) — (3) (3) Mark-to-market derivative liabilities (noncurrent liabilities) (4) — (4) Total mark-to-market derivative liabilities (4) (3) (7) Total mark-to-market derivative net assets $ 2 $ 2 $ 4 Cash Flow Hedges (Interest Rate Risk) For derivative instruments that qualify and are designated as cash flow hedges, the changes in fair value each period are initially recorded in AOCI and reclassified into earnings when the underlying transaction affects earnings. The total notional of the swaps issued as of December 31, 2022 was $1.27 billion. In January 2023, Exelon Corporate entered into $115 million notional of 5-year maturity floating-to-fixed swaps and $115 million notional of 10-year maturity floating-to-fixed swaps, for a total of $230 million designated as cash flow hedges. In February 2023, Exelon terminated the previously issued floating-to-fixed swaps with a total notional of $1.5 billion upon issuance of $2.5 billion of debt. See Note 10 – Debt and Credit Agreements for additional information on the debt issuance. Prior to the termination, the AOCI derivative gain was $7 million (net of tax). The settlements resulted in a cash receipt of $10 million, which will be amortized into Interest expense in Exelon's Consolidated Statement of Operations and Comprehensive Income over the terms of the swaps. See Note 14 – Changes in Accumulated Other Comprehensive Income (Loss) for additional information. In March 2023, Exelon Corporate entered into $65 million notional of 5-year maturity floating-to-fixed swaps and $65 million 10-year maturity floating-to-fixed swaps, for a total of $130 million designated as cash flow hedges. The related AOCI derivative gain for the three months ended as of March 31, 2023 was immaterial. Economic Hedges (Interest Rate and Other Risk) Exelon Corporate executes derivative instruments to mitigate exposure to fluctuations in interest rates but for which the fair value or cash flow hedge elections were not made. For derivatives intended to serve as economic hedges, fair value is recorded on the balance sheet and changes in fair value each period are recognized in earnings or as a regulatory asset or liability, if regulatory requirements are met, each period. Exelon Corporate enters into floating-to-fixed interest rate cap swaps to manage a portion of interest rate exposure in connection with existing borrowings. In the fourth quarter of 2022, Exelon Corporate entered into $1 billion notional of 18-month maturity floating-to-fixed interest rate cap swaps and $850 million notional of 6-month maturity floating-to-fixed interest rate cap swaps, for a total of $1.85 billion notional of floating-to-fixed interest rate cap swaps as of December 31, 2022. The 6-month maturity floating-to-fixed interest rate cap swaps of $850 million notional matured in March 2023. The total remaining notional of the swaps was $1 billion as of March 31, 2023. Additionally, to manage potential fluctuations in Electric operating revenues related to ComEd's distribution formula rate, Exelon Corporate enters into 30-year constant maturity treasury interest rate (Corporate 30-year treasury) swaps. In the first quarter of 2023, Exelon Corporate entered into a total of $3.6 billion notional of calendar year 2023 Corporate 30-year treasury swaps. The total notional of the swaps issued was $4.1 billion and $500 million as of March 31, 2023 and December 31, 2022, respectively. For the three months ended March 31, 2023, Exelon Corporate recognized the following net pre-tax mark-to-market gains (losses) which are also recognized in Net fair value changes related to derivatives in Exelon's Consolidated Statements of Cash Flows. Exelon had no swaps for the three months ended March 31, 2022 . Gain (Loss) Income Statement Location 2023 Electric operating revenues $ 1 Interest expense (1) Total $ — 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. The amount of cash collateral received from external counterparties decreased as of March 31, 2023 due to decreasing energy prices. The amount of cash collateral for PECO was immaterial as of March 31, 2023 and December 31, 2022. The following table reflects the Registrants' cash collateral held with external counterparties, which is recorded in Other current liabilities on their respective Consolidated Balance Sheets, as of March 31, 2023 and December 31, 2022: March 31, 2023 December 31, 2022 Exelon $ 81 $ 297 ComEd 73 77 BGE 1 23 PHI 8 197 Pepco 1 26 DPL 1 121 ACE 6 50

Debt and Credit Agreements (All

Debt and Credit Agreements (All Registrants)	3 Months Ended
Debt and Credit Agreements (All Registrants)	Mar. 31, 2023
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 supported by the revolving credit agreements and bilateral credit agreements as of March 31, 2023 and December 31, 2022. As of March 31, 2023 and December 31, 2022, ACE had no commercial paper borrowings: Outstanding Commercial Average Interest Rate on Commercial Paper Issuer March 31, 2023 December 31, 2022 March 31, 2023 December 31, 2022 Exelon (a) $ 807 $ 1,938 5.12 % 4.77 % ComEd 409 427 5.09 % 4.71 % PECO 145 239 5.04 % 4.71 % BGE 243 409 5.24 % 4.81 % PHI (b) — 414 — % 4.78 % Pepco — 299 — % 4.79 % DPL — 115 — % 4.76 % __________ (a) Exelon Corporate had $10 million and $449 million in outstanding commercial paper borrowings as of March 31, 2023 and December 31, 2022, respectively. (b) Represents the consolidated amounts of Pepco, DPL, and ACE. Revolving Credit Agreements Exelon Corporate and the Utility Registrants each have a 5-year 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 % Exelon Corporate and the Utility Registrants had no outstanding amounts on the revolving credit facilities as of March 31, 2023. The Utility Registrants have credit facility agreements, arranged at minority and community banks, which are solely utilized to issue letters of credit. The new facility agreements have aggregate commitments of $40 million, $40 million, $15 million, $15 million, $15 million, and $15 million, at ComEd, PECO, BGE, Pepco, DPL, and ACE, respectively. These facilities expire on October 6, 2023. See Note 16 — Debt and Credit Agreements of the 2022 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 in the first quarter of 2023 and was bifurcated into two tranches of $300 million on March 14, 2023 and $200 million on March 24, 2023. The agreements will expire on March 14, 2024 and March 22, 2024, respectively. Pursuant to the loan agreements, loans made thereunder bear interest at a variable rate equal to SOFR plus 0.90% and all indebtedness thereunder is unsecured. The loan agreement is reflected in Exelon's Consolidated Balance Sheets within Short-term borrowings. On October 4, 2022, ComEd entered into a 364-day term loan agreement for $150 million with a variable rate equal to SOFR plus 0.75% and an expiration date of October 3, 2023. The proceeds from this loan were used to repay outstanding commercial paper obligations. The balance of the loan was repaid on January 13, 2023 in conjunction with the $400 million and $575 million First Mortgage Bond agreements that were entered into on January 3, 2023. Refer to the Issuance of Long-Term Debt table below for further information. Long-Term Debt Issuance of Long-Term Debt During the three months ended March 31, 2023, the following long-term debt was issued: Company Type Interest Rate Maturity Amount Use of Proceeds Exelon Notes 5.15% March 15, 2028 $1,000 Repay existing indebtedness and for general corporate purposes. Exelon Notes 5.30% March 15, 2033 850 Repay existing indebtedness and for general corporate purposes. Exelon Notes 5.60% March 15, 2053 650 Repay existing indebtedness and for general corporate purposes. ComEd First Mortgage Bonds, Series 134 4.90% February 1, 2033 400 Repay outstanding commercial paper obligations and to fund other general corporate purposes. ComEd First Mortgage Bonds Series 135 5.30% February 1, 2053 575 Repay outstanding commercial paper obligations and to fund other general corporate purposes. Pepco (a) First Mortgage Bonds 5.30% March 15, 2033 85 Repay existing indebtedness and for general corporate purposes. Pepco First Mortgage Bonds 5.40% March 15, 2038 40 Repay existing indebtedness and for general corporate purposes. Pepco First Mortgage Bonds 5.57% March 15, 2053 125 Repay existing indebtedness and for general corporate purposes. DPL (b) First Mortgage Bonds 5.30% March 15, 2033 60 Repay existing indebtedness and for general corporate purposes. DPL First Mortgage Bonds 5.57% March 15, 2053 65 Repay existing indebtedness and for general corporate purposes. ACE First Mortgage Bonds 5.57% March 15, 2053 75 Repay existing indebtedness and for general corporate purposes. __________ (a) On March 15, 2023, Pepco entered into a purchase agreement of First Mortgage Bonds of $100 million at 5.35% due on September 13, 2033. The closing date of the issuance is expected to occur in September 2023. (b) On March 15, 2023, DPL entered into a purchase agreement of First Mortgage Bonds of $340 million, $75 million, and $110 million at 5.45%, 5.55% and 5.72% due on November 8, 2033, November 8, 2038, and November 8, 2053, respectively. The closing date of the issuance is expected to occur in November 2023. Debt Covenants As of March 31, 2023, the Registrants are in compliance with debt covenants.

Fair Value of Financial Assets

Fair Value of Financial Assets and Liabilities (All Registrants)	3 Months Ended
	Mar. 31, 2023
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 March 31, 2023 and December 31, 2022. The Registrants have no financial liabilities classified as Level 1 or measured using the NAV practical expedient. The carrying amounts of the Registrants’ short-term liabilities as presented in their Consolidated Balance Sheets are representative of their fair value (Level 2) because of the short-term nature of these instruments. March 31, 2023 December 31, 2022 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 $ 40,088 $ 33,224 $ 2,870 $ 36,094 $ 37,074 $ 29,902 $ 2,327 $ 32,229 ComEd 11,480 10,236 — 10,236 10,518 9,006 — 9,006 PECO 4,613 3,946 50 3,996 4,612 3,864 50 3,914 BGE 4,208 3,685 — 3,685 4,207 3,613 — 3,613 PHI 8,553 4,632 2,820 7,452 8,120 4,507 2,277 6,784 Pepco 3,995 2,295 1,507 3,802 3,751 2,229 1,205 3,434 DPL 2,061 1,183 604 1,787 1,938 1,164 458 1,622 ACE 1,831 935 709 1,644 1,757 909 614 1,523 Long-Term Debt to Financing Trusts Exelon $ 390 $ — $ 392 $ 392 $ 390 $ — $ 384 $ 384 ComEd 205 — 207 207 205 — 204 204 PECO 184 — 185 185 184 — 180 180 __________ (a) Includes unamortized debt issuance costs, unamortized debt discount and premium, net, purchase accounting fair value adjustments, and finance lease liabilities which are not fair valued. Refer to Note 16 — Debt and Credit Agreements of the 2022 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 2022 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 March 31, 2023 and December 31, 2022. The Registrants have no financial assets or liabilities measured using the NAV practical expedient: Exelon As of March 31, 2023 As of December 31, 2022 Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Assets Cash equivalents (a) $ 523 $ — $ — $ 523 $ 664 $ — $ — $ 664 Rabbi trust investments Cash equivalents 65 — — 65 62 — — 62 Mutual funds 49 — — 49 49 — — 49 Fixed income — 7 — 7 — 7 — 7 Life insurance contracts — 56 41 97 — 58 40 98 Rabbi trust investments subtotal 114 63 41 218 111 65 40 216 Interest rate derivative assets Derivatives designated as hedging instruments — — — — — 6 — 6 Economic hedges — 3 — 3 — 5 — 5 Interest rate derivative assets subtotal — 3 — 3 — 11 — 11 Total assets 637 66 41 744 775 76 40 891 Liabilities Mark-to-market derivative liabilities — — (98) (98) — — (84) (84) Interest rate derivative liabilities Derivatives designated as hedging instruments — (1) — (1) — (4) — (4) Economic hedges — (1) — (1) — (3) — (3) Interest rate derivative liabilities subtotal — (2) — (2) — (7) — (7) Deferred compensation obligation — (75) — (75) — (75) — (75) Total liabilities — (77) (98) (175) — (82) (84) (166) Total net assets (liabilities) $ 637 $ (11) $ (57) $ 569 $ 775 $ (6) $ (44) $ 725 __________ (a) Exelon excludes cash of $482 million and $345 million as of March 31, 2023 and December 31, 2022, respectively, and restricted cash of $78 million and $81 million as of March 31, 2023 and December 31, 2022, respectively, and includes long-term restricted cash of $180 million and $117 million as of March 31, 2023 and December 31, 2022, respectively, which is reported in Other deferred debits and other assets in the Consolidated Balance Sheets. ComEd, PECO, and BGE ComEd PECO BGE As of March 31, 2023 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) $ 454 $ — $ — $ 454 $ 11 $ — $ — $ 11 $ 1 $ — $ — $ 1 Rabbi trust investments Mutual funds — — — — 8 — — 8 9 — — 9 Life insurance contracts — — — — — 15 — 15 — — — — Rabbi trust investments subtotal — — — — 8 15 — 23 9 — — 9 Total assets 454 — — 454 19 15 — 34 10 — — 10 Liabilities Mark-to-market derivative liabilities (b) — — (98) (98) — — — — — — — — Deferred compensation obligation — (8) — (8) — (8) — (8) — (4) — (4) Total liabilities — (8) (98) (106) — (8) — (8) — (4) — (4) Total net assets (liabilities) $ 454 $ (8) $ (98) $ 348 $ 19 $ 7 $ — $ 26 $ 10 $ (4) $ — $ 6 ComEd PECO BGE As of December 31, 2022 Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Assets Cash equivalents (a) $ 392 $ — $ — $ 392 $ 10 $ — $ — $ 10 $ 23 $ — $ — $ 23 Rabbi trust investments Mutual funds — — — — 7 — — 7 7 — — 7 Life insurance contracts — — — — — 15 — 15 — — — — Rabbi trust investments subtotal — — — — 7 15 — 22 7 — — 7 Total assets 392 — — 392 17 15 — 32 30 — — 30 Liabilities Mark-to-market derivative liabilities (b) — — (84) (84) — — — — — — — — Deferred compensation obligation — (8) — (8) — (7) — (7) — (4) — (4) Total liabilities — (8) (84) (92) — (7) — (7) — (4) — (4) Total net assets (liabilities) $ 392 $ (8) $ (84) $ 300 $ 17 $ 8 $ — $ 25 $ 30 $ (4) $ — $ 26 __________ (a) ComEd excludes cash of $51 million and $42 million as of March 31, 2023 and December 31, 2022, respectively, and restricted cash of $73 million and $77 million as of March 31, 2023 and December 31, 2022, respectively, and includes long-term restricted cash of $180 million and $117 million as of March 31, 2023 and December 31, 2022, respectively, which is reported in Other deferred debits and other assets in the Consolidated Balance Sheets. PECO excludes cash of $25 million and $58 million as of March 31, 2023 and December 31, 2022, respectively. BGE excludes cash of $19 million and $43 million as of March 31, 2023 and December 31, 2022, respectively, and restricted cash of $1 million and $1 million as of March 31, 2023 and December 31, 2022, respectively. (b) The Level 3 balance consists of the current and noncurrent liability of $22 million and $76 million, respectively, as of March 31, 2023 and $5 million and $79 million, respectively, as of December 31, 2022 related to floating-to-fixed energy swap contracts with unaffiliated suppliers. PHI, Pepco, DPL, and ACE As of March 31, 2023 As of December 31, 2022 PHI Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Assets Cash equivalents (a) $ 35 $ — $ — $ 35 $ 205 $ — $ — $ 205 Rabbi trust investments Cash equivalents 62 — — 62 59 — — 59 Mutual funds 10 — — 10 11 — — 11 Fixed income — 7 — 7 — 7 — 7 Life insurance contracts — 20 39 59 — 22 39 61 Rabbi trust investments subtotal 72 27 39 138 70 29 39 138 Total assets 107 27 39 173 275 29 39 343 Liabilities Deferred compensation obligation — (13) — (13) — (14) — (14) Total liabilities — (13) — (13) — (14) — (14) Total net assets $ 107 $ 14 $ 39 $ 160 $ 275 $ 15 $ 39 $ 329 Pepco DPL ACE As of March 31, 2023 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) $ 26 $ — $ — $ 26 $ 1 $ — $ — $ 1 $ 1 $ — $ — $ 1 Rabbi trust investments Cash equivalents 61 — — 61 — — — — — — — — Life insurance contracts — 20 39 59 — — — — — — — — Rabbi trust investments subtotal 61 20 39 120 — — — — — — — — Total assets 87 20 39 146 1 — — 1 1 — — 1 Liabilities Deferred compensation obligation — (1) — (1) — — — — — — — — Total liabilities — (1) — (1) — — — — — — — — Total net assets $ 87 $ 19 $ 39 $ 145 $ 1 $ — $ — $ 1 $ 1 $ — $ — $ 1 Pepco DPL ACE As of December 31, 2022 Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Assets Cash equivalents (a) $ 51 $ — $ — $ 51 $ 121 $ — $ — $ 121 $ 1 $ — $ — $ 1 Rabbi trust investments Cash equivalents 59 — — 59 — — — — — — — — Life insurance contracts — 22 38 60 — — — — — — — — Rabbi trust investments subtotal 59 22 38 119 — — — — — — — — Total assets 110 22 38 170 121 — — 121 1 — — 1 Liabilities Deferred compensation obligation — (1) — (1) — — — — — — — — Total liabilities — (1) — (1) — — — — — — — — Total net assets $ 110 $ 21 $ 38 $ 169 $ 121 $ — $ — $ 121 $ 1 $ — $ — $ 1 __________ (a) PHI excludes cash of $358 million and $165 million as of March 31, 2023 and December 31, 2022, respectively, and restricted cash of $3 million and $3 million as of March 31, 2023 and December 31, 2022, respectively. Pepco excludes cash of $124 million and $45 million as of March 31, 2023 and December 31, 2022, respectively, and restricted cash of $3 million and $3 million as of March 31, 2023 and December 31, 2022, respectively. DPL excludes cash of $142 million and $31 million as of March 31, 2023 and December 31, 2022, respectively. ACE excludes cash of $70 million and $71 million as of March 31, 2023 and December 31, 2022, 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 months ended March 31, 2023 and 2022: Exelon ComEd PHI and Pepco Three Months Ended March 31, 2023 Total Mark-to-Market Life Insurance Contracts Balance as of December 31, 2022 $ (44) $ (84) $ 40 Total realized / unrealized gains Included in net income (a) 1 — 1 Included in regulatory assets/liabilities (14) (14) (b) — Balance as of March 31, 2023 $ (57) $ (98) (c) $ 41 The amount of total gains included in income attributed to the change in unrealized gains related to assets and liabilities as of March 31, 2023 $ 1 $ — $ 1 Exelon ComEd PHI and Pepco Three Months Ended March 31, 2022 Total Mark-to-Market Life Insurance Contracts Balance as of December 31, 2021 $ (182) $ (219) $ 35 Total realized / unrealized gains Included in net income (a) 1 — 1 Included in regulatory assets 75 75 (b) — Transfers out of Level 3 (1) — — Balance as of March 31, 2022 $ (107) $ (144) $ 36 The amount of total gains included in income attributed to the change in unrealized gain related to assets and liabilities as of March 31, 2022 $ 1 $ — $ 1 __________ (a) Classified in Operating and maintenance expense in the Consolidated Statements of Operations and Comprehensive Income. (b) Includes $25 million of decreases in fair value and an increase for realized gains due to settlements of $11 million recorded in Purchased power expense associated with floating-to-fixed energy swap contracts with unaffiliated suppliers for the three months ended March 31, 2023. Includes $69 million of increases in fair value and an increase for realized losses due to settlements of $6 million recorded in Purchased power expense associated with floating-to-fixed energy swap contracts with unaffiliated suppliers for the three months ended March 31, 2022. (c) The balance consists of a current and noncurrent liability of $22 million and $76 million, respectively, as of March 31, 2023. 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 17 — Fair Value of Financial Assets and Liabilities of the 2022 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 March 31, 2023 Fair Value as of December 31, 2022 Valuation Unobservable 2023 Range & Arithmetic Average 2022 Range & Arithmetic Average Mark-to-market derivatives $ (98) $ (84) Discounted Forward power price (a) $22.49 - $83.26 $47.69 $34.78 - $75.71 $48.44 ________ (a) An increase to the forward power price would increase the fair value.

Commitments and Contingencies (

Commitments and Contingencies (All Registrants)	3 Months Ended
Commitments and Contingencies (All Registrants)	Mar. 31, 2023
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 18 — Commitments and Contingencies of the 2022 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 March 31, 2023: Description Exelon PHI Pepco DPL ACE Total commitments $ 513 $ 320 $ 120 $ 89 $ 111 Remaining commitments (a) 48 42 37 3 2 __________ (a) Remaining commitments extend through 2026 and include rate credits, energy efficiency programs and delivery system modernization. Commercial Commitments (All Registrants). The Registrants’ commercial commitments as of March 31, 2023, representing commitments potentially triggered by future events were as follows: Expiration within Total 2023 2024 2025 2026 2027 2028 and beyond Exelon Letters of credit $ 19 $ 17 $ 2 $ — $ — $ — $ — Surety bonds (a) 205 190 15 — — — — Financing trust guarantees 378 — — — — — 378 Guaranteed lease residual values (b) 29 — 5 6 5 4 9 Total commercial commitments $ 631 $ 207 $ 22 $ 6 $ 5 $ 4 $ 387 ComEd Letters of credit $ 12 $ 10 $ 2 $ — $ — $ — $ — Surety bonds (a) 47 42 5 — — — — Financing trust guarantees 200 — — — — — 200 Total commercial commitments $ 259 $ 52 $ 7 $ — $ — $ — $ 200 PECO Letters of credit $ 1 $ 1 $ — $ — $ — $ — $ — Surety bonds (a) 2 1 1 — — — — Financing trust guarantees 178 — — — — — 178 Total commercial commitments $ 181 $ 2 $ 1 $ — $ — $ — $ 178 BGE Letters of credit $ 2 $ 2 $ — $ — $ — $ — $ — Surety bonds (a) 3 2 1 — — — — Total commercial commitments $ 5 $ 4 $ 1 $ — $ — $ — $ — PHI Surety bonds (a) $ 95 $ 90 $ 5 $ — $ — $ — $ — Guaranteed lease residual values (b) 29 — 5 6 5 4 9 Total commercial commitments $ 124 $ 90 $ 10 $ 6 $ 5 $ 4 $ 9 Pepco Surety bonds (a) $ 84 $ 84 $ — $ — $ — $ — $ — Guaranteed lease residual values (b) 10 — 2 2 2 1 3 Total commercial commitments $ 94 $ 84 $ 2 $ 2 $ 2 $ 1 $ 3 DPL Surety bonds (a) $ 6 $ 2 $ 4 $ — $ — $ — $ — Guaranteed lease residual values (b) 12 — 2 2 2 2 4 Total commercial commitments $ 18 $ 2 $ 6 $ 2 $ 2 $ 2 $ 4 ACE Surety bonds (a) $ 5 $ 4 $ 1 $ — $ — $ — $ — Guaranteed lease residual values (b) 7 — 1 2 1 1 2 Total commercial commitments $ 12 $ 4 $ 2 $ 2 $ 1 $ 1 $ 2 __________ (a) Surety bonds — Guarantees issued related to contract and commercial agreements, excluding bid bonds. (b) Represents the maximum potential obligation in the event that the fair value of certain leased equipment and fleet vehicles is zero at the end of the maximum lease term. The lease term associated with these assets ranges from 1 to 9 years. The maximum potential obligation at the end of the minimum lease term would be $65 million guaranteed by Exelon and PHI, of which $21 million, $27 million, and $17 million is guaranteed by Pepco, DPL, and ACE, respectively. Historically, payments under the guarantees have not been made and PHI believes the likelihood of payments being required under the guarantees is remote. Environmental Remediation Matters General (All Registrants). The Registrants’ operations have in the past, and may in the future, require substantial expenditures to comply with environmental laws. Additionally, under federal and state environmental laws, the Registrants are generally liable for the costs of remediating environmental contamination of property now or formerly owned by them and of property contaminated by hazardous substances generated by them. The Registrants own or lease a number of real estate parcels, including parcels on which their operations or the operations of others may have resulted in contamination by substances that are considered hazardous under environmental laws. In addition, the Registrants are currently involved in a number of proceedings relating to sites where hazardous substances have been deposited and may be subject to additional proceedings in the future. Unless otherwise disclosed, the Registrants cannot reasonably estimate whether they will incur significant liabilities for additional investigation and remediation costs at these or additional sites identified by the Registrants, environmental agencies or others, or whether such costs will be recoverable from third parties, including customers. Additional costs could have a material, unfavorable impact on the Registrants' financial statements. MGP Sites (All Registrants). ComEd, PECO, BGE, and DPL have identified sites where former MGP or gas purification activities have or may have resulted in actual site contamination. For some sites, there are additional PRPs that may share responsibility for the ultimate remediation of each location. • ComEd has 20 sites that are currently under some degree of active study and/or remediation. ComEd expects the majority of the remediation at these sites to continue through at least 2031. • PECO has 6 sites that are currently under some degree of active study and/or remediation. PECO expects the majority of the remediation at these sites to continue through at least 2024. • BGE has 4 sites that currently require some level of remediation and/or ongoing activity. BGE expects the majority of the remediation at these sites to continue through at least 2025. • DPL has 1 site that is currently under study and the required cost at the site is not expected to be material. The historical nature of the MGP and gas purification sites and the fact that many of the sites have been buried and built over, impacts the ability to determine a precise estimate of the ultimate costs prior to initial sampling and determination of the exact scope and method of remedial activity. Management determines its best estimate of remediation costs using all available information at the time of each study, including probabilistic and deterministic modeling for ComEd and PECO, and the remediation standards currently required by the applicable state environmental agency. Prior to completion of any significant clean up, each site remediation plan is approved by the appropriate state environmental agency. ComEd, pursuant to an ICC order, and PECO, pursuant to a PAPUC order, are currently recovering environmental remediation costs of former MGP facility sites through customer rates. While BGE and DPL do not have riders for MGP clean-up costs, they have historically received recovery of actual clean-up costs in distribution rates. As of March 31, 2023 and December 31, 2022, 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: March 31, 2023 December 31, 2022 Total environmental Portion of total related to Total environmental Portion of total related to Exelon $ 421 $ 343 $ 409 $ 355 ComEd 313 312 325 324 PECO 25 23 25 23 BGE 9 8 9 8 PHI 70 — 46 — Pepco 68 — 44 — DPL 1 — 1 — ACE 1 — 1 — Benning Road Site (Exelon, PHI, and Pepco) . In September 2010, PHI received a letter from EPA identifying the Benning Road site as one of six land-based sites potentially contributing to contamination of the lower Anacostia River. A portion of the site, which is owned by Pepco, was formerly the location of an electric generating facility owned by Pepco subsidiary, Pepco Energy Services (PES), which became a part of Generation, following the 2016 merger between PHI and Exelon. This generating facility was deactivated in June 2012. The remaining portion of the site consists of a Pepco transmission and distribution service center that remains in operation. In December 2011, the U.S. District Court for the District of Columbia approved a Consent Decree entered into by Pepco and Pepco Energy Services (hereinafter "Pepco Entities") with the DOEE, which requires the Pepco Entities to conduct a Remedial Investigation and Feasibility Study (RI/FS) for the Benning Road site and an approximately 10 to 15-acre portion of the adjacent Anacostia River. The purpose of this RI/FS is to define the nature and extent of contamination from the Benning Road site and to evaluate remedial alternatives. Pursuant to an internal agreement between the Pepco Entities, since 2013, Pepco has performed the work required by the Consent Decree and has been reimbursed for that work by an agreed upon allocation of costs between the Pepco Entities. In September 2019, the Pepco Entities issued a draft “final” RI report which DOEE approved on February 3, 2020. The Pepco Entities are completing a FS to evaluate possible remedial alternatives for submission to DOEE. In October 2022, DOEE approved dividing the work to complete the landside portion of the FS from the waterside portion to expedite the overall schedule for completion of the project. After completion and approval of the landside FS, now scheduled for September 2023, DOEE will prepare a Proposed Plan for public comment and then issue a Record of Decision (ROD) identifying any further response actions determined to be necessary to address any landside issues. The DOEE will issue a separate ROD for the waterside FS when that work is completed which is now anticipated to be by March 31, 2024. As part of the separation between Exelon and Constellation in February 2022, the internal agreement between the Pepco Entities for completion and payment for the remaining Consent Decree work was memorialized in a formal agreement for post-separation activities. A second post-separation assumption agreement between Exelon and Constellation transferred any of the potential remaining remediation liability, if any, of PES/Generation to a non-utility subsidiary of Exelon which going forward will be responsible for those liabilities. Exelon, PHI, and Pepco have determined that a loss associated with this matter is probable and have accrued an estimated liability, which is included in the table above. Anacostia River Tidal Reach (Exelon, PHI, and Pepco) . Contemporaneous with the Benning Road site RI/FS being performed by the Pepco Entities, DOEE and NPS have been conducting a separate RI/FS focused on the entire tidal reach of the Anacostia River extending from just north of the Maryland-District of Columbia boundary line to the confluence of the Anacostia and Potomac Rivers. The river-wide RI incorporated the results of the river sampling performed by the Pepco Entities as part of the Benning RI/FS, as well as similar sampling efforts conducted by owners of other sites adjacent to this segment of the river and supplemental river sampling conducted by DOEE’s contractor. On September 30, 2020, DOEE released its Interim ROD. The Interim ROD reflects an adaptive management approach which will require several identified “hot spots” in the river to be addressed first while continuing to conduct studies and to monitor the river to evaluate improvements and determine potential future remediation plans. The adaptive management process chosen by DOEE is less intrusive, provides more long-term environmental certainty, is less costly, and allows for site specific remediation plans already underway, including the plan for the Benning Road site to proceed to conclusion. On July 15, 2022, Pepco received a letter from the District of Columbia's Office of the Attorney General (D.C. OAG) on behalf of DOEE conveying a settlement offer to resolve all PRPs' liability to the District of Columbia (District) for their past costs and their anticipated future costs to complete the work for the Interim ROD. Pepco responded on July 27, 2022 to enter into settlement discussions. Since that time Exelon and the other PRPs at the site have exchanged letters with the D.C. OAG exploring potential settlement options. Those discussions are ongoing. Exelon, PHI, and Pepco have determined that it is probable that costs for remediation will be incurred and have accrued a liability for management's best estimate of its share of the costs. Pepco concluded that incremental exposure remains reasonably possible, but management cannot reasonably estimate a range of loss beyond the amounts recorded, which are included in the table above. In addition to the activities associated with the remedial process outlined above, CERCLA separately requires federal and state (here including Washington, D.C.) Natural Resource Trustees (federal or state agencies designated by the President or the relevant state, respectively, or Indian tribes) to conduct an assessment of any damages to natural resources within their jurisdiction as a result of the contamination that is being remediated. The Trustees can seek compensation from responsible parties for such damages, including restoration costs. During the second quarter of 2018, Pepco became aware that the Trustees are in the beginning stages of a NRD assessment, a process that often takes many years beyond the remedial decision to complete. Pepco has entered into negotiations with the Trustees to evaluate possible incorporation of NRD assessment and restoration as part of its remedial activities associated with the Benning site to accelerate the NRD benefits for that portion of the Anacostia River Sediment Project (ARSP) assessment. Pepco has concluded that a loss associated with the eventual NRD assessment is reasonably possible. Due to the very early stage of the assessment process, Pepco cannot reasonably estimate the final range of loss potentially resulting from this process. As noted in the Benning Road Site disclosure above, as part of the separation of Exelon and Constellation in February 2022, an assumption agreement was executed transferring any potential future remediation liabilities associated with the Benning Site remediation to a non-utility subsidiary of Exelon. Similarly, any potential future liability associated with the ARSP was also assumed by this entity. Buzzard Point Site (Exelon, PHI, and Pepco). On December 8, 2022, Pepco received a letter from the D.C. OAG, alleging wholly past violations of the District's stormwater discharge and waste disposal requirements related to operations at the Buzzard Point facility, a 9-acre parcel of waterfront property in Washington, D.C. occupied by an active substation and former steam plant building. The letter also alleged wholly past violations by Pepco of stormwater discharge requirements related to its district-wide system of underground vaults. The D.C. OAG invited Pepco to resolve the threatened enforcement action through a court-approved consent decree, and Pepco is engaged in discussions with the D.C. OAG regarding a potential resolution. Exelon, PHI, and Pepco have determined that a loss associated with this matter is probable and have accrued an estimated liability. Pepco concluded that incremental exposure is reasonably possible, but the range of loss cannot be reasonably estimated beyond the amounts included in the table above. Litigation and Regulatory Matters DPA and Related Matters (Exelon and ComEd). Exelon and ComEd received a grand jury subpoena in the second quarter of 2019 from the U.S. Attorney’s Office for the Northern District of Illinois (USAO) requiring production of information concerning their lobbying activities in the State of Illinois. On October 4, 2019, Exelon and ComEd received a second grand jury subpoena from the USAO requiring production of records of any communications with certain individuals and entities. On October 22, 2019, the SEC notified Exelon and ComEd that it had also opened an investigation into their lobbying activities. On July 17, 2020, ComEd entered into a DPA with the USAO to resolve the USAO investigation. Under the DPA, the USAO filed a single charge alleging that ComEd improperly gave and offered to give jobs, vendor subcontracts, and payments associated with those jobs and subcontracts for the benefit of the former Speaker of the Illinois House of Representatives and the Speaker’s associates, with the intent to influence the Speaker’s action regarding legislation affecting ComEd’s interests. The DPA provides that the USAO will defer any prosecution of such charge and any other criminal or civil case against ComEd in connection with the matters identified therein for a three-year period subject to certain obligations of ComEd, including payment to the U.S. Treasury of $200 million, which was paid in November 2020. Exelon was not made a party to the DPA, and therefore the investigation by the USAO into Exelon’s activities ended with no charges being brought against Exelon. The SEC’s investigation remains ongoing and Exelon and ComEd have cooperated fully and intend to continue to cooperate fully with the SEC. Exelon and ComEd cannot predict the outcome of the SEC investigation. No loss contingency has been reflected in Exelon's and ComEd's consolidated financial statements with respect to the SEC investigation, as this contingency is neither probable nor reasonably estimable at this time. Subsequent to Exelon announcing the receipt of the subpoenas, various lawsuits were filed, and various demand letters were received related to the subject of the subpoenas, the conduct described in the DPA and the SEC's investigation, including: • Four putative class action lawsuits against ComEd and Exelon were filed in federal court on behalf of ComEd customers in the third quarter of 2020 alleging, among other things, civil violations of federal racketeering laws. In addition, the Citizens Utility Board (CUB) filed a motion to intervene in these cases on October 22, 2020 which was granted on December 23, 2020. On September 9, 2021, the federal court granted Exelon’s and ComEd’s motion to dismiss and dismissed the plaintiffs’ and CUB’s federal law claim with prejudice. The federal court also dismissed the related state law claims made by the federal plaintiffs and CUB on jurisdictional grounds. Plaintiffs appealed dismissal of the federal law claim to the Seventh Circuit Court of Appeals. Plaintiffs and CUB also refiled their state law claims in state court and moved to consolidate them with the already pending consumer state court class action, discussed below. On August 22, 2022, the Seventh Circuit affirmed the dismissal of the consolidated federal cases in their entirety. The time to further appeal has passed and the Seventh Circuit’s decision is final. • Three putative class action lawsuits against ComEd and Exelon were filed in Illinois state court in the third quarter of 2020 seeking restitution and compensatory damages on behalf of ComEd customers. The cases were consolidated into a single action in October of 2020. In November 2020, CUB filed a motion to intervene in the cases pursuant to an Illinois statute allowing CUB to intervene as a party or otherwise participate on behalf of utility consumers in any proceeding which affects the interest of utility consumers. On November 23, 2020, the court allowed CUB’s intervention, but denied CUB's request to stay these cases. Plaintiffs subsequently filed a consolidated complaint, and ComEd and Exelon filed a motion to dismiss on jurisdictional and substantive grounds on January 11, 2021. Briefing on that motion was completed on March 2, 2021. The parties agreed, on March 25, 2021, along with the federal court plaintiffs discussed above, to jointly engage in mediation. The parties participated in a one-day mediation on June 7, 2021 but no settlement was reached. On December 23, 2021, the state court granted ComEd and Exelon's motion to dismiss with prejudice. On December 30, 2021, plaintiffs filed a motion to reconsider that dismissal and for permission to amend their complaint. The court denied the plaintiffs' motion on January 21, 2022. Plaintiffs have appealed the court's ruling dismissing their complaint to the First District Court of Appeals. On February 15, 2022, Exelon and ComEd moved to dismiss the federal plaintiffs' refiled state law claims, seeking dismissal on the same legal grounds asserted in their motion to dismiss the original state court plaintiffs' complaint. The court granted dismissal of the refiled state claims on February 16, 2022. The original federal plaintiffs appealed that dismissal on February 18, 2022. The two state appeals were consolidated on March 21, 2022. The appellate briefing is complete and the parties are awaiting oral argument and/or a decision. • On November 3, 2022, a plaintiff filed a putative class action complaint in Lake County, Illinois Circuit Court against ComEd and Exelon for unjust enrichment and deceptive business practices in connection with the conduct giving rise to the DPA. Plaintiff seeks an accounting and disgorgement of any benefits ComEd allegedly obtained from said conduct. Plaintiff served initial discovery requests on ComEd in December 2022, to which ComEd has responded. ComEd and Exelon filed a motion to dismiss the Complaint on February 3, 2023. The parties fully briefed the motion, and on April 21, 2023, the court heard oral argument on the motion. The court expects to issue its ruling on the motion to dismiss on or before June 9, 2023. • A putative class action lawsuit against Exelon and certain officers of Exelon and ComEd was filed in federal court in December 2019 alleging misrepresentations and omissions in Exelon’s SEC filings related to ComEd’s lobbying activities and the related investigations. The complaint was amended on September 16, 2020, to dismiss two of the original defendants and add other defendants, including ComEd. Defendants filed a motion to dismiss in November 2020. The court denied the motion in April 2021. On May 26, 2021, defendants moved the court to certify its order denying the motion to dismiss for interlocutory appeal. Briefing on the motion was completed in June 2021. That motion was denied on January 28, 2022. In May 2021, the parties each filed respective initial discovery disclosures. On June 9, 2021, defendants filed their answer and affirmative defenses to the complaint and the parties engaged thereafter in discovery. On September 9, 2021, the U.S. government moved to intervene in the lawsuit and stay discovery until the parties entered into an amendment to their protective order that would prohibit the parties from requesting discovery into certain matters, including communications with the U.S. government. The court ordered said amendment to the protective order on November 15, 2021 and discovery resumed. The court further amended the protective order on October 17, 2022 and extended it until May 15, 2023. The next court status is set for June 27, 2023. Based on recent developments, management has determined that a probable loss exists for this matter in the amount of $173 million. Management anticipates that such loss would be fully covered by insurance. The probable loss and the expected insurance recovery are reflected in Exelon's Consolidated Balance Sheets within Accrued expenses and Other accounts receivable, respectively. • Several shareholders have sent letters to the Exelon Board of Directors since 2020 demanding, among other things, that the Exelon Board of Directors investigate and address alleged breaches of fiduciary duties and other alleged violations by Exelon and ComEd officers and directors related to the conduct described in the DPA. In the first quarter of 2021, the Exelon Board of Directors appointed a Special Litigation Committee (SLC) consisting of disinterested and independent parties to investigate and address these shareholders’ allegations and make recommendations to the Exelon Board of Directors based on the outcome of the SLC’s investigation. In July 2021, one of the demand letter shareholders filed a derivative action against current and former Exelon and ComEd officers and directors, and against Exelon, as nominal defendant, asserting the same claims made in its demand letter. On October 12, 2021, the parties to the derivative action filed an agreed motion to stay that litigation for 120 days in order to allow the SLC to continue its investigation, which the court granted. The stay has been extended several times. On March 27, 2023, the court issued an order further extending the stay until June 9, 2023, with a status report due by May 31, 2023. The parties participated in a mediation in February 2023 and efforts to resolve the matter remain ongoing. On April 26 and May 1, 2023, two additional demand letter shareholders each filed a separate derivative lawsuit against current and former Exelon and ComEd officers and directors, and certain third parties, and against Exelon as nominal defendant, asserting claims similar to those made in their respective demand letters. • Several shareholders have sent requests seeking review of certain Exelon books and records since August 2021. Exelon has responded to each request. Except as noted above, no loss contingencies have been reflected in Exelon's and ComEd's consolidated financial statements with respect to these matters, as such contingencies are neither probable nor reasonably estimable at this time. In August 2022, the ICC concluded its investigation initiated on August 12, 2021 into rate impacts of conduct admitted in the DPA, including the costs recovered from customers related to the DPA and Exelon's funding of the fine paid by ComEd. On August 17, 2022, the ICC issued its final order accepting ComEd's voluntary customer refund offer of approximately $38 million (of which about $31 million is ICC jurisdictional; the remaining balance is FERC jurisdictional) that resolves the question of whether customer funds were used for DPA related activities. The customer refund includes the cost of every individual or entity that was either (i) identified in the DPA or (ii) identified by ComEd as an associate of the former Speaker of the Illinois House of Representatives in the ICC proceeding. The ICC rejected an argument by the Illinois Attorney General, City of Chicago, and CUB that a costly permanent adjustment also needed to be made to ComEd's ratemaking capital structure on account of Exelon having funded ComEd's payment of the DPA fine with an equity infusion. On October 6, the ICC denied the application for rehearing filed by the Illinois Attorney General, City of Chicago, and CUB that specifically focused on their capital structure argument. The window to file an appeal on the ICC final order has expired and the ICC’s DPA investigation is now closed. An accrual for the amount of the customer refund has been recorded in Regulatory liabilities and Regulatory assets in Exelon’s and ComEd’s Consolidated Balance Sheets as of March 31, 2023. The ICC jurisdictional refund is being made to customers during the April 2023 billing cycle, as required by the ICC. The FERC jurisdictional refund will be made as part of the next transmission formula rate update proceeding in 2023. The customer refund will not be recovered in rates or charged to customers and ComEd will not seek or accept reimbursement or indemnification from any source other than Exelon. Savings Plan Claim (Exelon). On December 6, 2021, seven current and former employees filed a putative ERISA class action suit in U.S. District Court for the Northern District of Illinois against Exelon, its Board of Directors, the former Board Investment Oversight 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. On March 4, 2022, the Chamber of Commerce filed a brief of amicus curiae in support of the defendants' motion to dismiss. On September 22, 2022, the court granted Exelon’s motion to dismiss without prejudice. The court granted plaintiffs leave until October 31, 2022 to file an amended complaint, which was later extended to November 30, 2022. Plaintiffs filed their amended complaint on November 30, 2022. Defendants filed their motion to dismiss the amended complaint on January 20, 2023. Briefing on the motion to dismiss is now complete and the parties await a ruling. 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 Registrants are also from time to time subject to audits and investigations by the FERC and other regulators. 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.

Shareholders' Equity (Exelon)

Shareholders' Equity (Exelon)	3 Months Ended
Shareholders' Equity (Exelon)	Mar. 31, 2023
Equity [Abstract]
Stockholders' Equity Note Disclosure	Shareholders' Equity (Exelon) At-the-Market (ATM) Program On August 4, 2022, Exelon executed an equity distribution agreement (“Equity Distribution Agreement”), with certain sales agents and forward sellers and certain forward purchasers, establishing an ATM equity distribution program under which it may offer and sell shares of its Common Stock, having an aggregate gross sales price of up to $1.0 billion. Exelon has no obligation to offer or sell any shares of Common Stock under the Equity Distribution Agreement and may, at any time, suspend or terminate offers and sales under the Equity Distribution Agreement. As of March 31, 2023, Exelon has not issued any shares of Common Stock under the ATM program and has not entered into any forward sale agreements.

Changes in Accumulated Other Co

Changes in Accumulated Other Comprehensive Income (Exelon)	3 Months Ended
Changes in Accumulated Other Comprehensive Income (Exelon)	Mar. 31, 2023
Changes in Accumulated Other Comprehensive Income [Abstract]
Changes in Accumulated Other Comprehensive Income	Changes in Accumulated Other Comprehensive Income (Loss) (Exelon) The following tables present changes in Exelon's AOCI, net of tax, by component: Three Months Ended March 31, 2023 Cash Flow Hedges Pension and Non-Pension Postretirement Benefit Plan Items (a) Foreign Total Balance as of December 31, 2022 $ 2 $ (640) $ — $ (638) OCI before reclassifications 6 (10) — (4) Amounts reclassified from AOCI — 3 — 3 Net current-period OCI 6 (7) — (1) Balance as of March 31, 2023 $ 8 $ (647) $ — $ (639) Three Months Ended March 31, 2022 Cash Flow Hedges Pension and Non-Pension Postretirement Benefit Plan Items (a) Foreign Total Balance as of December 31, 2021 $ (6) $ (2,721) $ (23) $ (2,750) Separation of Constellation 6 1,994 23 2,023 Amounts reclassified from AOCI — 14 — 14 Net current-period OCI — 14 — 14 Balance as of March 31, 2022 $ — $ (713) $ — $ (713) __________ (a) This AOCI component is included in the computation of net periodic pension and OPEB cost. Additionally, as of February 1, 2022, in connection with the separation, Exelon's pension and OPEB plans were remeasured. See Note 14 — Retirement Benefits of the 2022 Form 10-K and 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 March 31, 2023 2022 Pension and non-pension postretirement benefit plans: Actuarial loss reclassified to periodic benefit cost $ (1) $ (5) Pension and non-pension postretirement benefit plans valuation adjustment 3 — Unrealized gain on cash flow hedges (1) —

Supplemental Financial Informat

Supplemental Financial Information (All Registrants)	3 Months Ended
Supplemental Financial Information (All Registrants)	Mar. 31, 2023
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 March 31, 2023 Utility taxes (a) $ 220 $ 74 $ 40 $ 29 $ 77 $ 68 $ 8 $ 1 Property 99 10 4 50 35 24 11 — Payroll 32 7 5 5 7 2 1 1 Three Months Ended March 31, 2022 Utility taxes (a) $ 221 $ 78 $ 38 $ 27 $ 78 $ 70 $ 7 $ 1 Property 94 10 4 46 34 23 10 1 Payroll 37 7 4 4 7 2 1 1 _________ (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 March 31, 2023 AFUDC — Equity $ 38 $ 10 $ 6 $ 3 $ 19 $ 14 $ 2 $ 3 Non-service net periodic benefit cost (1) — — — — — — — Three Months Ended March 31, 2022 AFUDC — Equity $ 36 $ 8 $ 7 $ 6 $ 15 $ 11 $ 2 $ 2 Non-service net periodic benefit cost 17 — — — — — — — Supplemental Cash Flow Information The following tables provide additional information about material items recorded in the Registrants' Consolidated Statements of Cash Flows. Depreciation, amortization, and accretion Exelon (a) ComEd PECO BGE PHI Pepco DPL ACE Three Months Ended March 31, 2023 Property, plant, and equipment (b) $ 680 $ 267 $ 95 $ 124 $ 180 $ 76 $ 51 $ 47 Amortization of regulatory assets (b) 178 71 3 43 61 32 9 20 Amortization of intangible assets, net (b) 2 — — — — — — — Total depreciation and amortization $ 860 $ 338 $ 98 $ 167 $ 241 $ 108 $ 60 $ 67 Three Months Ended March 31, 2022 Property, plant, and equipment (b) $ 726 $ 254 $ 88 $ 117 $ 164 $ 72 $ 45 $ 41 Amortization of regulatory assets (b) 179 67 4 54 54 36 12 6 Amortization of intangible assets, net (b) 6 — — — — — — — Amortization of energy contract assets and liabilities (c) 3 — — — — — — — Nuclear fuel (d) 66 — — — — — — — ARO accretion (e) 44 — — — — — — — Total depreciation, amortization, and accretion $ 1,024 $ 321 $ 92 $ 171 $ 218 $ 108 $ 57 $ 47 __________ (a) Exelon's 2022 amounts include amounts related to Generation prior to the separation. See Note 2 — Discontinued Operations for additional information. (b) Included in Depreciation and amortization in the Registrants' Consolidated Statements of Operations and Comprehensive Income. (c) Included in Electric operating revenues or Purchased power expense in Exelon’s Consolidated Statements of Operations and Comprehensive Income. (d) Included in Purchased fuel expense in Exelon's Consolidated 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 Three Months Ended March 31, 2023 Pension and OPEB costs (benefit) $ 45 $ 6 $ (3) $ 14 $ 24 $ 8 $ 4 $ 4 Allowance for credit losses 70 — 37 18 15 7 5 3 True-up adjustments to decoupling mechanisms and formula rates (b) (282) (153) 4 (65) (68) (39) (11) (18) Long-term incentive plan 2 — — — — — — — Amortization of operating ROU asset 10 1 — 1 7 1 2 1 Change in environmental liabilities 25 — — — 25 25 — — AFUDC — Equity (38) (10) (6) (3) (19) (14) (2) (3) Three Months Ended March 31, 2022 Pension and OPEB costs (benefit) $ 44 $ 16 $ (2) $ 12 $ 13 $ 2 $ 1 $ 3 Allowance for credit losses 78 17 27 18 18 9 6 3 Other decommissioning-related activity 36 — — — — — — — Energy-related options 60 — — — — — — — True-up adjustments to decoupling mechanisms and formula rates (b) (29) (40) (6) 12 5 7 1 (3) Long-term incentive plan 25 — — — — — — — Amortization of operating ROU asset 23 1 — 7 7 2 2 1 AFUDC — Equity (36) (8) (7) (6) (15) (11) (2) (2) __________ (a) Exelon's 2022 amounts include amounts related to Generation prior to the separation. See Note 2 — Discontinued Operations for additional information. (b) For ComEd, reflects the true-up adjustments in regulatory assets and liabilities associated with its distribution, energy efficiency, distributed generation, and transmission formula rates. For PECO, reflects the change in regulatory assets and liabilities associated with its transmission formula rates. For BGE, Pepco, DPL, and ACE, reflects the change in regulatory assets and liabilities associated with their decoupling mechanisms and transmission formula rates. See Note 3 — Regulatory Matters of the 2022 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 March 31, 2023 Cash and cash equivalents $ 522 $ 75 $ 27 $ 20 $ 367 $ 126 $ 142 $ 71 Restricted cash and cash equivalents 381 323 9 1 29 27 1 — Restricted cash included in other deferred debits and other assets 180 180 — — — — — — Total cash, restricted cash, and cash equivalents $ 1,083 $ 578 $ 36 $ 21 $ 396 $ 153 $ 143 $ 71 December 31, 2022 Cash and cash equivalents $ 407 $ 67 $ 59 $ 43 $ 198 $ 45 $ 31 $ 72 Restricted cash and cash equivalents 566 327 9 24 175 54 121 — Restricted cash included in other deferred debits and other assets 117 117 — — — — — — Total cash, restricted cash, and cash equivalents $ 1,090 $ 511 $ 68 $ 67 $ 373 $ 99 $ 152 $ 72 March 31, 2022 Cash and cash equivalents $ 2,476 $ 343 $ 26 $ 41 $ 796 $ 502 $ 120 $ 168 Restricted cash and cash equivalents 430 246 8 34 106 34 73 — Restricted cash included in other deferred debits and other assets 92 92 — — — — — — Total cash, restricted cash, and cash equivalents $ 2,998 $ 681 $ 34 $ 75 $ 902 $ 536 $ 193 $ 168 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 deferred debits and other 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 For additional information on restricted cash see Note 1 — Significant Accounting Policies of the 2022 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 March 31, 2023 Compensation-related accruals (a) $ 359 $ 107 $ 43 $ 42 $ 59 $ 18 $ 11 $ 10 Taxes accrued 214 102 3 83 94 67 14 16 Interest accrued 373 78 44 45 75 35 22 16 December 31, 2022 Compensation-related accruals (a) $ 613 $ 179 $ 81 $ 79 $ 104 $ 29 $ 20 $ 16 Taxes accrued 211 92 10 34 70 52 8 12 Interest accrued 338 124 47 42 61 32 9 14 __________ (a) Primarily includes accrued payroll, bonuses and other incentives, vacation, and benefits.

Related Party Transactions (All

Related Party Transactions (All Registrants)	3 Months Ended
Related Party Transactions (All Registrants)	Mar. 31, 2023
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 affiliate and an immaterial amount recorded as Operating and maintenance expense from affiliates at the Utility Registrants. Effective February 1, 2022, Generation is no longer considered a related party. Three Months Ended March 31, 2022 ComEd (a) $ 59 PECO (b) 33 BGE (c) 18 PHI 51 Pepco (d) 39 DPL (e) 10 ACE (f) 2 __________ (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 March 31, Three Months Ended March 31, 2023 2022 2023 2022 Exelon BSC $ 175 $ 205 PHISCO 24 19 ComEd BSC $ 83 $ 85 81 85 PECO BSC 51 49 30 36 BGE BSC 54 51 24 38 PHI BSC 42 50 40 46 PHISCO — — 24 19 Pepco BSC 27 29 14 17 PHISCO 30 29 11 8 DPL BSC 17 18 10 14 PHISCO 24 24 7 6 ACE BSC 14 15 14 15 PHISCO 22 21 6 5 Current Receivables from/Payables to affiliates The following tables present current Receivables from affiliates and current Payables to affiliates: March 31, 2023 Receivables from affiliates: Payables to affiliates: ComEd PECO BGE Pepco DPL ACE BSC PHISCO Other Total ComEd $ — $ — $ — $ — $ — $ 78 $ — $ 6 $ 84 PECO $ — — — — 1 39 — 8 48 BGE — — — — — 35 — 2 37 PHI — — — — — — 7 — 10 17 Pepco — — — — — 22 15 1 38 DPL — 1 — — — 13 12 — 26 ACE — 1 — 1 — 13 11 — 26 Other 3 — — — — 1 — 1 5 Total $ 3 $ 2 $ — $ 1 $ — $ 2 $ 207 $ 39 $ 27 $ 281 December 31, 2022 Receivables from affiliates: Payables to affiliates: ComEd PECO BGE Pepco DPL ACE BSC PHISCO Other Total ComEd $ — $ — $ — $ — $ — $ 66 $ — $ 8 $ 74 PECO $ — — — — — 39 — 3 42 BGE — — — — — 38 — 1 39 PHI — — — — — — 4 — 10 14 Pepco — — — — — 20 13 1 34 DPL — 2 — — — 12 8 — 22 ACE — 2 — — — 14 9 1 26 Other 3 — — — — 1 — — 4 Total $ 3 $ 4 $ — $ — $ — $ 1 $ 193 $ 30 $ 24 $ 255 Borrowings from Exelon/PHI intercompany money pool To provide an additional short-term borrowing option that will generally be more favorable to the borrowing participants than the cost of external financing both Exelon and PHI operate an intercompany money pool. PECO and PHI Corporate participate in the Exelon intercompany money pool. Pepco, DPL, and ACE participate in the PHI intercompany money pool. Long-term debt to financing trusts The following table presents Long-term debt to financing trusts: March 31, 2023 December 31, 2022 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)	3 Months Ended
Significant Accounting Policies (Policies)	Mar. 31, 2023
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 transmission and distribution 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, finance, engineering, customer operations, distribution and transmission planning, asset management, system operations, and power procurement, to PHI operating companies. The costs of BSC and PHISCO are directly charged or allocated to the applicable subsidiaries. The results of Exelon’s corporate operations are presented as “Other” in the consolidated financial statements and include intercompany eliminations unless otherwise disclosed. The accompanying consolidated financial statements as of March 31, 2023 and for the three months ended March 31, 2023 and 2022 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, 2022 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, 2023. 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, met 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 the three months ended March 31, 2022. See Note 2 — Discontinued Operations for additional information.

Discontinued Operations (Tables

Discontinued Operations (Tables) - Exelon Generation Co L L C [Member]	3 Months Ended
	Mar. 31, 2023
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 months ended March 31, 2022. 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 2022 Operating revenues Competitive business revenues $ 1,855 Competitive business revenues from affiliates 161 Total operating revenues 2,016 Operating expenses Competitive businesses purchased power and fuel 1,138 Operating and maintenance (a) 371 Depreciation and amortization 94 Taxes other than income taxes 44 Total operating expenses 1,647 Gain on sales of assets and businesses 10 Operating income 379 Other income and (deductions) Interest expense, net (20) Other, net (281) Total other (deductions) and income (301) Income before income taxes 78 Income taxes (40) Equity in losses of unconsolidated affiliates (1) Net income 117 Net income attributable to noncontrolling interests 1 Net income from discontinued operations $ 116 __________ (a) Includes transaction and transition costs related to the separation of $52 million for the three months ended March 31, 2022.
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 three months ended March 31, 2022. Three Months Ended 2022 Non-cash items included in net income from discontinued operations: Depreciation, amortization, and accretion, including nuclear fuel and energy contract amortization $ 207 Loss on sales of assets and businesses 9 Deferred income taxes and amortization of investment tax credits (143) Net fair value changes related to derivatives (59) Net realized and unrealized losses on NDT fund investments 205 Net unrealized losses on equity investments 16 Other decommissioning-related activity 36 Cash flows from investing activities: Capital expenditures (227) Collection of DPP 169 Supplemental cash flow information: Decrease in capital expenditures not paid (128) Increase in DPP 348 Increase in PP&E related to ARO update 335

Regulatory Matters (Tables)

Regulatory Matters (Tables)	3 Months Ended
Regulatory Matters (Tables)	Mar. 31, 2023
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 2023. 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 15, 2022 Electric $ 199 $ 199 7.85 % November 17, 2022 January 1, 2023 PECO - Pennsylvania March 31, 2022 Natural Gas 82 55 N/A (b) October 27, 2022 January 1, 2023 BGE - Maryland (c) May 15, 2020 (amended September 11, 2020) Electric 203 140 9.50 % December 16, 2020 January 1, 2021 Natural Gas 108 74 9.65 % Pepco - Maryland (d) October 26, 2020 (amended March 31, 2021) Electric 104 52 9.55 % June 28, 2021 June 28, 2021 DPL - Maryland (e) May 19, 2022 Electric 38 29 9.60 % December 14, 2022 January 1, 2023 __________ (a) ComEd's 2023 approved revenue requirement above reflects an increase of $144 million for the initial year revenue requirement for 2023 and an increase of $55 million related to the annual reconciliation for 2021. The revenue requirement for 2023 provides for a weighted average debt and equity return on distribution rate base of 5.94%, inclusive of an allowed ROE of 7.85%, reflecting the monthly average yields for 30-year treasury bonds plus 580 basis points. The reconciliation revenue requirement for 2021 provides for a weighted average debt and equity return on distribution rate base of 5.91%, inclusive of an allowed ROE of 7.78%, reflecting the monthly yields on 30-year treasury bonds plus 580 basis points less a performance metrics penalty of 7 basis points. This is ComEd's last performance-based electric distribution formula rate update filing under EIMA. See discussion of CEJA below for details on the transition away from the electric distribution formula rate. (b) The PECO natural gas 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. BGE proposed to use certain tax benefits to fully offset the increases in 2021 and 2022 and partially offset the increase in 2023. The MDPSC awarded BGE electric revenue requirement increases of $59 million, $39 million, and $42 million, before offsets, in 2021, 2022, and 2023, respectively, and natural gas revenue requirement increases of $53 million, $11 million, and $10 million, before offsets, in 2021, 2022, and 2023, respectively. However, the MDPSC utilized the tax benefits to fully offset the increases in 2021 and January 2022 such that customer rates remained unchanged. For the remainder of 2022, the MDPSC chose to offset only 25% of the cumulative 2021 and 2022 electric revenue requirement increases and 50% of the cumulative gas revenue requirement increases. In 2021, the MDPSC deferred a decision on whether to use certain tax benefits to offset the revenue requirement increases in 2023 and directed BGE to make another proposal at the end of 2022. In September 2022 BGE proposed that tax benefits not be used to offset the 2023 revenue requirement increases. On October 26, 2022, the MDPSC accepted BGE's recommendation to not use tax benefits to offset the 2023 revenue requirement increases. (d) Reflects a 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. (e) Reflects a three-year cumulative multi-year plan for January 1, 2023 through December 31, 2025. The MDPSC awarded DPL electric incremental revenue requirement increases of $17 million, $6 million, and $6 million for 2023, 2024, and 2025, respectively. Pending Distribution Base Rate Case Proceedings Registrant/Jurisdiction Filing Date Service Requested Revenue Requirement Increase Requested ROE Expected Approval Timing ComEd - Illinois (a) January 17, 2023 Electric $ 1,472 10.50% to 10.65% Fourth quarter of 2023 ComEd - Illinois (b) April 21, 2023 Electric 247 8.91% Fourth quarter of 2023 BGE - Maryland (c) February 17, 2023 Electric 313 10.40% Fourth quarter of 2023 Natural Gas 289 10.40% Pepco - District of Columbia (d) April 13, 2023 Electric 191 10.50% First quarter of 2024 DPL - Delaware (e) December 15, 2022 (amended February 28, 2023) Electric 48 10.50% Second quarter of 2024 ACE - New Jersey (f) February 15, 2023 Electric 105 10.50% First quarter of 2024 __________ (a) Reflects a four-year cumulative MRP for January 1, 2024 to December 31, 2027 and total requested revenue requirement increases of $877 million effective January 1, 2024, $175 million effective January 1, 2025, $217 million effective January 1, 2026, and $203 million effective January 1, 2027, based on forecasted revenue requirements. The revenue requirement will provide for a weighted average debt and equity return on distribution rate base of 7.43% in 2024, 7.50% in 2025, 7.62% in 2026, and 7.70% in 2027, inclusive of an allowed ROE of 10.50% in 2024, 10.55% in 2025, 10.60% in 2026, and 10.65% in 2027. The requested revenue requirements are based on capital structures that reflect between 50.58% and 51.19% common equity. ComEd’s MRP also includes a proposed rate phase-in to defer approximately $307 million of the $877 million year-over-year increase for 2024 revenue from 2024 to 2026. (b) On April 21, 2023, ComEd filed its proposed Delivery Reconciliation Amount of $247 million un der Rider Delivery Service Pricing Reconciliation (Rider DSPR) which allows for the reconciliation of the revenue requirement in effect in the final years in which formula rates are determined and until such time as new rates are established under ComEd’s approved MRP. The 2023 filing reconciles the delivery service rates in effect in 2022 with the actual delivery service costs incurred in 2022. Final order is expected by December 2023, and the reconciliation amount will be in customer rates beginning January 1, 2024. (c) Reflects a three-year cumulative multi-year plan for January 1, 2024 through December 31, 2026 submitted to the MDPSC. Inclusive of the proposed acceleration of remaining electric tax benefits in 2024 and 2025, and remaining gas tax benefits in 2024, BGE requested total electric revenue requirement increases of $85 million, $103 million, and $125 million in 2024, 2025, and 2026, respectively, and natural gas revenue requirement increases of $158 million, $77 million, and $54 million in 2024, 2025, and 2026, respectively. Requested revenue requirement increases will be used to recover capital investments designed to increase the resilience of the electric and gas distribution systems and support Maryland’s climate and regulatory initiatives. The 2021 and 2022 reconciliation amounts are not included in the requested revenue requirement increase, as BGE is proposing that these amounts be recovered through the separate electric and gas riders in 2024. The 2021 reconciliation amounts are $11 million and $7 million for electric and gas, respectively, and the 2022 reconciliation amounts are $44 million and $15 million for electric and gas, respectively. (d) Reflects a three-year cumulative multi-year plan for January 1, 2024 through December 31, 2026 submitted to the DCPSC. Pepco requested total electric revenue requirement increases of $117 million, $37 million, and $37 million in 2024, 2025, and 2026, respectively. Requested revenue requirement increases will be used to recover capital investments designed to advance system-readiness and support the District of Columbia’s climate and clean energy goals. (e) The rates will go into effect on July 15, 2023, subject to refund.
Public Utilities Transmission Rate Filings [Table Text Block]	For 2023, the following increases/(decreases) were included in BGE's annual electric transmission formula rate updates. ComEd, PECO, Pepco, DPL, and ACE intend to file by the required deadline for the annual update. Registrant (a) Initial Revenue Requirement Increase Annual Reconciliation Decrease Total Revenue Requirement Increase Allowed Return on Rate Base (b) Allowed ROE (c) BGE $ 19 $ (12) $ 4 (d) 7.34 % 10.50 % __________ (a) All rates are effective June 1, 2023 - May 31, 2024, subject to review by interested parties pursuant to review protocols of tariffs. (b) Represents the weighted average debt and equity return on transmission rate bases. (c) The rate of return on common equity includes a 50-basis-point incentive adder for being a member of a RTO.
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. PECO had no related amounts as of March 31, 2023 and December 31, 2022. Exelon ComEd (a) BGE (b) PHI Pepco (c) DPL (c) ACE (b) March 31, 2023 $ 53 $ 13 $ 26 $ 14 $ 11 $ 2 $ 1 December 31, 2022 57 8 28 21 18 2 1 __________ (a) Reflects ComEd's unrecognized equity returns earned for ratemaking purposes on its electric distribution formula rate regulatory assets. (b) BGE's and ACE's authorized amounts capitalized for ratemaking purposes primarily relate to earnings on shareholder's investment on their respective 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)	3 Months Ended
Revenue from Contracts with Customers (Tables)	Mar. 31, 2023
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 March 31, 2023. 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. Year Exelon PHI Pepco DPL ACE 2023 $ 7 $ 7 $ 5 $ 1 $ 1 2024 6 6 5 — 1 2025 5 5 5 — — 2026 5 5 5 — — 2027 and thereafter 77 77 60 9 8 Total $ 100 $ 100 $ 80 $ 10 $ 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 months ended March 31, 2023 and 2022. As of March 31, 2023 and December 31, 2022, ComEd's, PECO's, and BGE's contract liabilities were immaterial. Exelon (a) PHI (a) Pepco (a) DPL ACE Balance as of December 31, 2022 $ 101 $ 101 $ 81 $ 10 $ 10 Revenues recognized (1) (1) (1) — — Balance as of March 31, 2023 $ 100 $ 100 $ 80 $ 10 $ 10 Exelon (a) PHI (a) Pepco (a) DPL ACE 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 __________ (a) Revenues recognized in the three months ended March 31, 2023 and 2022, were included in the contract liabilities at December 31, 2022 and 2021, respectively.

Segment Information (Tables)

Segment Information (Tables)	3 Months Ended
Segment Information (Tables)	Mar. 31, 2023
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 months ended March 31, 2023 and 2022 is as follows: ComEd PECO BGE PHI Other (a) Intersegment Exelon Operating revenues (b) : 2023 Electric revenues $ 1,667 $ 795 $ 814 $ 1,436 $ — $ (5) $ 4,707 Natural gas revenues — 317 443 97 — (1) 856 Shared service and other revenues — — — 3 437 (440) — Total operating revenues $ 1,667 $ 1,112 $ 1,257 $ 1,536 $ 437 $ (446) $ 5,563 2022 Electric revenues $ 1,734 $ 741 $ 736 $ 1,318 $ — $ (7) $ 4,522 Natural gas revenues — 306 418 83 — (2) 805 Shared service and other revenues — — — 3 576 (579) — Total operating revenues $ 1,734 $ 1,047 $ 1,154 $ 1,404 $ 576 $ (588) $ 5,327 Intersegment revenues (c) : 2023 $ 3 $ 2 $ 3 $ 3 $ 434 $ (445) $ — 2022 6 1 7 3 576 (587) 6 Depreciation and amortization: 2023 $ 338 $ 98 $ 167 $ 241 $ 16 $ — $ 860 2022 321 92 171 218 15 — 817 Operating expenses: 2023 $ 1,256 $ 902 $ 964 $ 1,297 $ 485 $ (447) $ 4,457 2022 1,406 793 919 1,215 625 (531) 4,427 Interest expense, net: 2023 $ 117 $ 48 $ 44 $ 76 $ 127 $ — $ 412 2022 100 41 35 69 93 — 338 Income (loss) from continuing operations before income taxes: 2023 $ 312 $ 170 $ 252 $ 189 $ (120) $ — $ 803 2022 240 220 207 137 (62) (43) 699 Income taxes: 2023 $ 71 $ 4 $ 52 $ 34 $ (27) $ — $ 134 2022 52 14 9 7 146 (10) 218 Net income (loss) from continuing operations: 2023 $ 241 $ 166 $ 200 $ 155 $ (93) $ — $ 669 2022 188 206 198 130 (208) (33) 481 Capital expenditures: 2023 $ 617 $ 335 $ 350 $ 561 $ 18 $ — $ 1,881 2022 617 344 303 409 22 — 1,695 Total assets: March 31, 2023 $ 40,720 $ 14,738 $ 13,411 $ 26,208 $ 6,042 $ (4,194) $ 96,925 December 31, 2022 39,661 14,502 13,350 26,082 6,014 (4,260) 95,349 __________ (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 15 — Supplemental Financial Information for additional information on total utility taxes. (c) See Note 16 — Related Party Transactions for additional information on intersegment revenues. PHI: Pepco DPL ACE Other (a) Intersegment PHI Operating revenues (b) : 2023 Electric revenues $ 710 $ 377 $ 353 $ — $ (4) $ 1,436 Natural gas revenues — 97 — — — 97 Shared service and other revenues — — — 102 (99) 3 Total operating revenues $ 710 $ 474 $ 353 $ 102 $ (103) $ 1,536 2022 Electric revenues $ 614 $ 348 $ 349 $ — $ 7 $ 1,318 Natural gas revenues — 83 — — — 83 Shared service and other revenues — — — 107 (104) 3 Total operating revenues $ 614 $ 431 $ 349 $ 107 $ (97) $ 1,404 Intersegment revenues (c) : 2023 $ 1 $ 2 $ 1 $ 102 $ (103) $ 3 2022 1 1 1 97 (97) 3 Depreciation and amortization: 2023 $ 108 $ 60 $ 67 $ 6 $ — $ 241 2022 108 57 47 6 — 218 Operating expenses: 2023 $ 610 $ 388 $ 298 $ 104 $ (103) $ 1,297 2022 547 357 311 97 (97) 1,215 Interest expense, net: 2023 $ 39 $ 17 $ 16 $ 4 $ — $ 76 2022 36 16 14 3 — 69 Income (loss) before income taxes: 2023 $ 77 $ 72 $ 44 $ (4) $ — $ 189 2022 44 60 27 6 — 137 Income taxes: 2023 $ 12 $ 12 $ 11 $ (1) $ — $ 34 2022 (2) 4 1 4 — 7 Net income (loss): 2023 $ 65 $ 60 $ 33 $ (3) $ — $ 155 2022 46 56 26 2 — 130 Capital expenditures: 2023 $ 264 $ 134 $ 161 $ 2 $ — $ 561 2022 218 103 87 1 — 409 Total assets: March 31, 2023 $ 10,795 $ 5,804 $ 5,013 $ 4,638 $ (42) $ 26,208 December 31, 2022 10,657 5,802 4,979 4,677 (33) 26,082 __________ (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 15 — Supplemental Financial Information for additional information on total utility taxes. (c) Includes intersegment revenues with ComEd, BGE, and PECO, which are eliminated at Exelon. Electric and Gas Revenue by Customer Class (Utility Registrants): 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 March 31, 2023 Revenues from contracts with customers ComEd PECO BGE PHI Pepco DPL ACE Electric revenues Residential $ 836 $ 519 $ 434 $ 639 $ 283 $ 210 $ 146 Small commercial & industrial 361 135 92 160 39 62 59 Large commercial & industrial 84 65 149 378 282 33 63 Public authorities & electric railroads 10 8 7 17 8 4 5 Other (a) 217 68 96 176 56 58 63 Total electric revenues (b) $ 1,508 $ 795 $ 778 $ 1,370 $ 668 $ 367 $ 336 Natural gas revenues Residential $ — $ 223 $ 278 $ 60 $ — $ 60 $ — Small commercial & industrial — 75 41 26 — 26 — Large commercial & industrial — 1 70 1 — 1 — Transportation — 8 — 4 — 4 — Other (c) — 9 19 6 — 6 — Total natural gas revenues (d) $ — $ 316 $ 408 $ 97 $ — $ 97 $ — Total revenues from contracts with customers $ 1,508 $ 1,111 $ 1,186 $ 1,467 $ 668 $ 464 $ 336 Other revenues Revenues from alternative revenue programs $ 153 $ (4) $ 65 $ 65 $ 39 $ 9 $ 17 Other electric revenues (e) 6 4 4 4 3 1 — Other natural gas revenues (e) — 1 2 — — — — Total other revenues $ 159 $ 1 $ 71 $ 69 $ 42 $ 10 $ 17 Total revenues for reportable segments $ 1,667 $ 1,112 $ 1,257 $ 1,536 $ 710 $ 474 $ 353 Three Months Ended March 31, 2022 Revenues from contracts with customers ComEd PECO BGE PHI Pepco DPL ACE Electric revenues Residential $ 857 $ 487 $ 417 $ 652 $ 275 $ 207 $ 170 Small commercial & industrial 423 111 81 141 38 56 47 Large commercial & industrial 153 64 131 323 253 26 44 Public authorities & electric railroads 14 8 7 16 8 4 4 Other (a) 239 62 97 193 46 56 81 Total electric revenues (b) $ 1,686 $ 732 $ 733 $ 1,325 $ 620 $ 349 $ 346 Natural gas revenues Residential $ — $ 218 $ 282 $ 51 $ — $ 51 $ — Small commercial & industrial — 76 45 21 — 21 — Large commercial & industrial — — 65 3 — 3 — Transportation — 8 — 4 — 4 — Other (c) — 3 35 4 — 4 — Total natural gas revenues (d) $ — $ 305 $ 427 $ 83 $ — $ 83 $ — Total revenues from contracts with customers $ 1,686 $ 1,037 $ 1,160 $ 1,408 $ 620 $ 432 $ 346 Other revenues Revenues from alternative revenue programs $ 40 $ 6 $ (12) $ (5) $ (7) $ (1) $ 3 Other electric revenues (e) 8 3 4 1 1 — — Other natural gas revenues (e) — 1 2 — — — — Total other revenues $ 48 $ 10 $ (6) $ (4) $ (6) $ (1) $ 3 Total revenues for reportable segments $ 1,734 $ 1,047 $ 1,154 $ 1,404 $ 614 $ 431 $ 349 __________ (a) Includes revenues from transmission revenue from PJM, wholesale electric revenue and mutual assistance revenue. (b) Includes operating revenues from affiliates in 2023 and 2022 respectively of: • $3 million, $6 million at ComEd • $1 million, $1 million at PECO • $2 million, $2 million at BGE • $3 million, $3 million at PHI • $1 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 2023 and 2022 respectively of: • $1 million, less than a $1 million at PECO • $1 million, $6 million at BGE (e) Includes late payment charge revenues.

Accounts Receivable (Tables)

Accounts Receivable (Tables)	3 Months Ended
Accounts Receivable (Tables)	Mar. 31, 2023
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 March 31, 2023 Exelon ComEd PECO BGE PHI Pepco DPL ACE Balance as of December 31, 2022 $ 327 $ 59 $ 105 $ 54 $ 109 $ 47 $ 21 $ 41 Plus: Current period provision for expected credit losses (a) 108 22 39 30 17 9 7 1 Less: Write-offs, net of recoveries (b) 46 7 14 11 14 7 2 5 Balance as of March 31, 2023 $ 389 $ 74 $ 130 $ 73 $ 112 $ 49 $ 26 $ 37 Three Months Ended March 31, 2022 Exelon ComEd PECO BGE PHI Pepco DPL ACE Balance as of December 31, 2021 $ 320 $ 73 $ 105 $ 38 $ 104 $ 37 $ 18 $ 49 Plus: Current period provision for expected credit losses 110 26 31 26 27 11 7 9 Less: Write-offs, net of recoveries 41 7 11 5 18 8 1 9 Balance as of March 31, 2022 $ 389 $ 92 $ 125 $ 59 $ 113 $ 40 $ 24 $ 49 __________ (a) For PECO and BGE, the change in current period provision for expected credit losses is primarily a result of increased aging of receivables. (b) Recoveries were not material to the Registrants. The following tables present the rollforward of Allowance for Credit Losses on Other Accounts Receivable. Three Months Ended March 31, 2023 Exelon ComEd PECO BGE PHI Pepco DPL ACE Balance as of December 31, 2022 $ 82 $ 17 $ 9 $ 10 $ 46 $ 25 $ 7 $ 14 Plus: Current period provision for expected credit losses 14 2 3 4 5 3 1 1 Less: Write-offs, net of recoveries (a) 5 1 1 2 1 — — 1 Balance as of March 31, 2023 $ 91 $ 18 $ 11 $ 12 $ 50 $ 28 $ 8 $ 14 Three Months Ended March 31, 2022 Exelon ComEd PECO BGE PHI Pepco DPL ACE Balance as of December 31, 2021 $ 72 $ 17 $ 7 $ 9 $ 39 $ 16 $ 8 $ 15 Plus: Current period provision for expected credit losses 14 4 3 3 4 2 1 1 Less: Write-offs, net of recoveries 5 1 1 1 2 — — 2 Balance as of March 31, 2022 $ 81 $ 20 $ 9 $ 11 $ 41 $ 18 $ 9 $ 14 __________ (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 March 31, 2023 and December 31, 2022. Unbilled customer revenues (a) Exelon ComEd PECO BGE PHI Pepco DPL ACE March 31, 2023 $ 709 $ 237 $ 149 $ 149 $ 174 $ 74 $ 49 $ 51 December 31, 2022 912 223 219 247 223 103 74 46 __________ (a) Unbilled customer revenues are classified in Customer accounts receivable, 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 Three months ended March 31, 2023 $ 1,108 $ 240 $ 309 $ 245 $ 314 $ 210 $ 56 $ 48 Three months ended March 31, 2022 1,044 248 292 222 282 174 57 51 __________

Income Taxes (Tables)

Income Taxes (Tables)	3 Months Ended
Income Taxes (Tables)	Mar. 31, 2023
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 March 31, 2023 (a) Exelon ComEd PECO (b) BGE PHI Pepco DPL ACE 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 6.0 7.9 (1.4) 6.4 6.0 5.4 6.3 6.9 Plant basis differences (4.0) (0.3) (15.2) (0.7) (1.8) (2.5) (1.0) (0.9) Excess deferred tax amortization (6.3) (5.7) (2.4) (5.4) (7.0) (8.4) (8.8) (2.0) Amortization of investment tax credit, including deferred taxes on basis difference (0.1) (0.1) — (0.1) (0.1) — (0.1) (0.1) Tax credits (0.5) (0.3) — (0.5) (0.4) (0.4) (0.4) (0.3) Other 0.6 0.3 0.4 (0.1) 0.3 0.5 (0.3) 0.4 Effective income tax rate 16.7 % 22.8 % 2.4 % 20.6 % 18.0 % 15.6 % 16.7 % 25.0 % Three Months Ended March 31, 2022 (a) Exelon ComEd PECO (c) BGE (c) PHI Pepco (c) DPL ACE (c) 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 (d) 21.1 8.0 (0.1) 2.4 3.7 (4.5) 6.2 6.8 Plant basis differences (3.6) (0.6) (11.3) (0.9) (1.6) (2.6) (0.7) (1.3) Excess deferred tax amortization (11.5) (6.3) (3.2) (17.6) (17.7) (17.4) (19.4) (22.2) 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 (e) 1.7 (0.3) — (0.4) (0.4) (0.4) (0.3) (0.3) Other (f) 2.6 — — (0.1) 0.2 (0.6) 0.1 (0.1) Effective income tax rate 31.2 % 21.7 % 6.4 % 4.3 % 5.1 % (4.5) % 6.7 % 3.7 % __________ (a) Positive percentages represent income tax expense. Negative percentages represent income tax benefit. (b) For PECO, the lower effective tax rate is primarily related to plant basis differences attributable to tax repair deductions. (c) 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 related to the acceleration of certain income tax benefits due to distribution rate case settlements. (d) 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 approximately $67 million and the recognition of a valuation allowance of approximately $40 million against the net deferred tax asset position for certain standalone state filing jurisdiction as a result of the separation. (e) For Exelon, reflects the income tax expense related to the write-off of federal tax credits subject to recapture of approximately $15 million as a result of the separation.
Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block]	Exelon, PHI and ACE have the following unrecognized tax benefits as of March 31, 2023 and December 31, 2022. ComEd's, PECO's, BGE's, Pepco's, and DPL's amounts are not material. Exelon (a) PHI ACE March 31, 2023 $ 148 $ 59 $ 17 December 31, 2022 148 59 17 __________

Retirement Benefits (Tables)

Retirement Benefits (Tables)	3 Months Ended
Retirement Benefits (Tables)	Mar. 31, 2023
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 months ended March 31, 2023 and 2022. Pension Benefits OPEB Three Months Ended March 31, Three Months Ended March 31, 2023 2022 2023 2022 Components of net periodic benefit cost: Service cost $ 39 $ 61 $ 6 $ 10 Interest cost 145 110 25 19 Expected return on assets (189) (209) (21) (25) Amortization of: Prior service cost (credit) 1 1 (2) (5) Actuarial loss 41 76 — 4 Net periodic benefit cost $ 37 $ 39 $ 8 $ 3
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, which apply multi-employer accounting, 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 March 31, Pension and OPEB Costs (Benefit) 2023 2022 Exelon $ 45 $ 42 ComEd 6 16 PECO (3) (2) BGE 14 11 PHI 24 13 Pepco 8 2 DPL 4 1 ACE 4 3
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 allows employees to contribute a portion of their pre-tax and/or after-tax income in accordance with specified guidelines. All Registrants match a percentage of the employee contributions up to certain limits. The following table presents the employer contributions and employer matching contributions to the savings plan for the three months ended March 31, 2023 and 2022. Three Months Ended March 31, Savings Plan Employer Contributions 2023 2022 Exelon $ 21 $ 20 ComEd 9 8 PECO 3 3 BGE 2 2 PHI 3 3 Pepco 1 1 DPL 1 1 ACE — —

Derivative Instruments and Hedg

Derivative Instruments and Hedging Activities (Tables)	3 Months Ended
Derivative Instruments and Hedging Activities (Tables)	Mar. 31, 2023
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Interest Rate Derivatives	Below is a summary of the interest rate hedge balances as of March 31, 2023 and December 31, 2022 . March 31, 2023 Derivatives Designated Economic Hedges Total Other deferred debits (noncurrent assets) $ — $ 3 $ 3 Total derivative assets — 3 3 Mark-to-market derivative liabilities (current liabilities) — (1) (1) Mark-to-market derivative liabilities (noncurrent liabilities) (1) — (1) Total mark-to-market derivative liabilities (1) (1) (2) Total mark-to-market derivative net assets $ (1) $ 2 $ 1 December 31, 2022 Derivatives Designated Economic Hedges Total Other deferred debits (noncurrent assets) $ 6 $ 5 $ 11 Total derivative assets 6 5 11 Mark-to-market derivative liabilities (current liabilities) — (3) (3) Mark-to-market derivative liabilities (noncurrent liabilities) (4) — (4) Total mark-to-market derivative liabilities (4) (3) (7) Total mark-to-market derivative net assets $ 2 $ 2 $ 4
Economic Hedges (Commodity Price Risk)	For the three months ended March 31, 2023, Exelon Corporate recognized the following net pre-tax mark-to-market gains (losses) which are also recognized in Net fair value changes related to derivatives in Exelon's Consolidated Statements of Cash Flows. Exelon had no swaps for the three months ended March 31, 2022 . Gain (Loss) Income Statement Location 2023 Electric operating revenues $ 1 Interest expense (1) Total $ —
Cash collateral held with external counterparties [Table]	The following table reflects the Registrants' cash collateral held with external counterparties, which is recorded in Other current liabilities on their respective Consolidated Balance Sheets, as of March 31, 2023 and December 31, 2022: March 31, 2023 December 31, 2022 Exelon $ 81 $ 297 ComEd 73 77 BGE 1 23 PHI 8 197 Pepco 1 26 DPL 1 121 ACE 6 50

Debt and Credit Agreements (Tab

Debt and Credit Agreements (Tables)	3 Months Ended
Debt and Credit Agreements (Tables)	Mar. 31, 2023
Debt Disclosure [Abstract]
Schedule of Commercial Paper Borrowings	The following table reflects the Registrants' commercial paper programs supported by the revolving credit agreements and bilateral credit agreements as of March 31, 2023 and December 31, 2022. As of March 31, 2023 and December 31, 2022, ACE had no commercial paper borrowings: Outstanding Commercial Average Interest Rate on Commercial Paper Issuer March 31, 2023 December 31, 2022 March 31, 2023 December 31, 2022 Exelon (a) $ 807 $ 1,938 5.12 % 4.77 % ComEd 409 427 5.09 % 4.71 % PECO 145 239 5.04 % 4.71 % BGE 243 409 5.24 % 4.81 % PHI (b) — 414 — % 4.78 % Pepco — 299 — % 4.79 % DPL — 115 — % 4.76 % __________ (a) Exelon Corporate had $10 million and $449 million in outstanding commercial paper borrowings as of March 31, 2023 and December 31, 2022, respectively. (b) Represents the consolidated amounts of Pepco, DPL, and ACE.
Schedule of Revolving Credit Agreements	Exelon Corporate and the Utility Registrants each have a 5-year 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 three months ended March 31, 2023, the following long-term debt was issued: Company Type Interest Rate Maturity Amount Use of Proceeds Exelon Notes 5.15% March 15, 2028 $1,000 Repay existing indebtedness and for general corporate purposes. Exelon Notes 5.30% March 15, 2033 850 Repay existing indebtedness and for general corporate purposes. Exelon Notes 5.60% March 15, 2053 650 Repay existing indebtedness and for general corporate purposes. ComEd First Mortgage Bonds, Series 134 4.90% February 1, 2033 400 Repay outstanding commercial paper obligations and to fund other general corporate purposes. ComEd First Mortgage Bonds Series 135 5.30% February 1, 2053 575 Repay outstanding commercial paper obligations and to fund other general corporate purposes. Pepco (a) First Mortgage Bonds 5.30% March 15, 2033 85 Repay existing indebtedness and for general corporate purposes. Pepco First Mortgage Bonds 5.40% March 15, 2038 40 Repay existing indebtedness and for general corporate purposes. Pepco First Mortgage Bonds 5.57% March 15, 2053 125 Repay existing indebtedness and for general corporate purposes. DPL (b) First Mortgage Bonds 5.30% March 15, 2033 60 Repay existing indebtedness and for general corporate purposes. DPL First Mortgage Bonds 5.57% March 15, 2053 65 Repay existing indebtedness and for general corporate purposes. ACE First Mortgage Bonds 5.57% March 15, 2053 75 Repay existing indebtedness and for general corporate purposes. __________ (a) On March 15, 2023, Pepco entered into a purchase agreement of First Mortgage Bonds of $100 million at 5.35% due on September 13, 2033. The closing date of the issuance is expected to occur in September 2023. (b) On March 15, 2023, DPL entered into a purchase agreement of First Mortgage Bonds of $340 million, $75 million, and $110 million at 5.45%, 5.55% and 5.72% due on November 8, 2033, November 8, 2038, and November 8, 2053, respectively. The closing date of the issuance is expected to occur in November 2023.

Fair Value of Financial Asset_2

Fair Value of Financial Assets and Liabilities (Tables)	3 Months Ended
Fair Value of Financial Assets and Liabilities (Tables)	Mar. 31, 2023
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 March 31, 2023 and December 31, 2022. The Registrants have no financial liabilities classified as Level 1 or measured using the NAV practical expedient. The carrying amounts of the Registrants’ short-term liabilities as presented in their Consolidated Balance Sheets are representative of their fair value (Level 2) because of the short-term nature of these instruments. March 31, 2023 December 31, 2022 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 $ 40,088 $ 33,224 $ 2,870 $ 36,094 $ 37,074 $ 29,902 $ 2,327 $ 32,229 ComEd 11,480 10,236 — 10,236 10,518 9,006 — 9,006 PECO 4,613 3,946 50 3,996 4,612 3,864 50 3,914 BGE 4,208 3,685 — 3,685 4,207 3,613 — 3,613 PHI 8,553 4,632 2,820 7,452 8,120 4,507 2,277 6,784 Pepco 3,995 2,295 1,507 3,802 3,751 2,229 1,205 3,434 DPL 2,061 1,183 604 1,787 1,938 1,164 458 1,622 ACE 1,831 935 709 1,644 1,757 909 614 1,523 Long-Term Debt to Financing Trusts Exelon $ 390 $ — $ 392 $ 392 $ 390 $ — $ 384 $ 384 ComEd 205 — 207 207 205 — 204 204 PECO 184 — 185 185 184 — 180 180 __________
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 March 31, 2023 and December 31, 2022. The Registrants have no financial assets or liabilities measured using the NAV practical expedient: Exelon As of March 31, 2023 As of December 31, 2022 Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Assets Cash equivalents (a) $ 523 $ — $ — $ 523 $ 664 $ — $ — $ 664 Rabbi trust investments Cash equivalents 65 — — 65 62 — — 62 Mutual funds 49 — — 49 49 — — 49 Fixed income — 7 — 7 — 7 — 7 Life insurance contracts — 56 41 97 — 58 40 98 Rabbi trust investments subtotal 114 63 41 218 111 65 40 216 Interest rate derivative assets Derivatives designated as hedging instruments — — — — — 6 — 6 Economic hedges — 3 — 3 — 5 — 5 Interest rate derivative assets subtotal — 3 — 3 — 11 — 11 Total assets 637 66 41 744 775 76 40 891 Liabilities Mark-to-market derivative liabilities — — (98) (98) — — (84) (84) Interest rate derivative liabilities Derivatives designated as hedging instruments — (1) — (1) — (4) — (4) Economic hedges — (1) — (1) — (3) — (3) Interest rate derivative liabilities subtotal — (2) — (2) — (7) — (7) Deferred compensation obligation — (75) — (75) — (75) — (75) Total liabilities — (77) (98) (175) — (82) (84) (166) Total net assets (liabilities) $ 637 $ (11) $ (57) $ 569 $ 775 $ (6) $ (44) $ 725 __________ (a) Exelon excludes cash of $482 million and $345 million as of March 31, 2023 and December 31, 2022, respectively, and restricted cash of $78 million and $81 million as of March 31, 2023 and December 31, 2022, respectively, and includes long-term restricted cash of $180 million and $117 million as of March 31, 2023 and December 31, 2022, respectively, which is reported in Other deferred debits and other assets in the Consolidated Balance Sheets. ComEd, PECO, and BGE ComEd PECO BGE As of March 31, 2023 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) $ 454 $ — $ — $ 454 $ 11 $ — $ — $ 11 $ 1 $ — $ — $ 1 Rabbi trust investments Mutual funds — — — — 8 — — 8 9 — — 9 Life insurance contracts — — — — — 15 — 15 — — — — Rabbi trust investments subtotal — — — — 8 15 — 23 9 — — 9 Total assets 454 — — 454 19 15 — 34 10 — — 10 Liabilities Mark-to-market derivative liabilities (b) — — (98) (98) — — — — — — — — Deferred compensation obligation — (8) — (8) — (8) — (8) — (4) — (4) Total liabilities — (8) (98) (106) — (8) — (8) — (4) — (4) Total net assets (liabilities) $ 454 $ (8) $ (98) $ 348 $ 19 $ 7 $ — $ 26 $ 10 $ (4) $ — $ 6 ComEd PECO BGE As of December 31, 2022 Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Assets Cash equivalents (a) $ 392 $ — $ — $ 392 $ 10 $ — $ — $ 10 $ 23 $ — $ — $ 23 Rabbi trust investments Mutual funds — — — — 7 — — 7 7 — — 7 Life insurance contracts — — — — — 15 — 15 — — — — Rabbi trust investments subtotal — — — — 7 15 — 22 7 — — 7 Total assets 392 — — 392 17 15 — 32 30 — — 30 Liabilities Mark-to-market derivative liabilities (b) — — (84) (84) — — — — — — — — Deferred compensation obligation — (8) — (8) — (7) — (7) — (4) — (4) Total liabilities — (8) (84) (92) — (7) — (7) — (4) — (4) Total net assets (liabilities) $ 392 $ (8) $ (84) $ 300 $ 17 $ 8 $ — $ 25 $ 30 $ (4) $ — $ 26 __________ (a) ComEd excludes cash of $51 million and $42 million as of March 31, 2023 and December 31, 2022, respectively, and restricted cash of $73 million and $77 million as of March 31, 2023 and December 31, 2022, respectively, and includes long-term restricted cash of $180 million and $117 million as of March 31, 2023 and December 31, 2022, respectively, which is reported in Other deferred debits and other assets in the Consolidated Balance Sheets. PECO excludes cash of $25 million and $58 million as of March 31, 2023 and December 31, 2022, respectively. BGE excludes cash of $19 million and $43 million as of March 31, 2023 and December 31, 2022, respectively, and restricted cash of $1 million and $1 million as of March 31, 2023 and December 31, 2022, respectively. (b) The Level 3 balance consists of the current and noncurrent liability of $22 million and $76 million, respectively, as of March 31, 2023 and $5 million and $79 million, respectively, as of December 31, 2022 related to floating-to-fixed energy swap contracts with unaffiliated suppliers. PHI, Pepco, DPL, and ACE As of March 31, 2023 As of December 31, 2022 PHI Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Assets Cash equivalents (a) $ 35 $ — $ — $ 35 $ 205 $ — $ — $ 205 Rabbi trust investments Cash equivalents 62 — — 62 59 — — 59 Mutual funds 10 — — 10 11 — — 11 Fixed income — 7 — 7 — 7 — 7 Life insurance contracts — 20 39 59 — 22 39 61 Rabbi trust investments subtotal 72 27 39 138 70 29 39 138 Total assets 107 27 39 173 275 29 39 343 Liabilities Deferred compensation obligation — (13) — (13) — (14) — (14) Total liabilities — (13) — (13) — (14) — (14) Total net assets $ 107 $ 14 $ 39 $ 160 $ 275 $ 15 $ 39 $ 329 Pepco DPL ACE As of March 31, 2023 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) $ 26 $ — $ — $ 26 $ 1 $ — $ — $ 1 $ 1 $ — $ — $ 1 Rabbi trust investments Cash equivalents 61 — — 61 — — — — — — — — Life insurance contracts — 20 39 59 — — — — — — — — Rabbi trust investments subtotal 61 20 39 120 — — — — — — — — Total assets 87 20 39 146 1 — — 1 1 — — 1 Liabilities Deferred compensation obligation — (1) — (1) — — — — — — — — Total liabilities — (1) — (1) — — — — — — — — Total net assets $ 87 $ 19 $ 39 $ 145 $ 1 $ — $ — $ 1 $ 1 $ — $ — $ 1 Pepco DPL ACE As of December 31, 2022 Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Assets Cash equivalents (a) $ 51 $ — $ — $ 51 $ 121 $ — $ — $ 121 $ 1 $ — $ — $ 1 Rabbi trust investments Cash equivalents 59 — — 59 — — — — — — — — Life insurance contracts — 22 38 60 — — — — — — — — Rabbi trust investments subtotal 59 22 38 119 — — — — — — — — Total assets 110 22 38 170 121 — — 121 1 — — 1 Liabilities Deferred compensation obligation — (1) — (1) — — — — — — — — Total liabilities — (1) — (1) — — — — — — — — Total net assets $ 110 $ 21 $ 38 $ 169 $ 121 $ — $ — $ 121 $ 1 $ — $ — $ 1 __________ (a) PHI excludes cash of $358 million and $165 million as of March 31, 2023 and December 31, 2022, respectively, and restricted cash of $3 million and $3 million as of March 31, 2023 and December 31, 2022, respectively. Pepco excludes cash of $124 million and $45 million as of March 31, 2023 and December 31, 2022, respectively, and restricted cash of $3 million and $3 million as of March 31, 2023 and December 31, 2022, respectively. DPL excludes cash of $142 million and $31 million as of March 31, 2023 and December 31, 2022, respectively. ACE excludes cash of $70 million and $71 million as of March 31, 2023 and December 31, 2022, 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 months ended March 31, 2023 and 2022: Exelon ComEd PHI and Pepco Three Months Ended March 31, 2023 Total Mark-to-Market Life Insurance Contracts Balance as of December 31, 2022 $ (44) $ (84) $ 40 Total realized / unrealized gains Included in net income (a) 1 — 1 Included in regulatory assets/liabilities (14) (14) (b) — Balance as of March 31, 2023 $ (57) $ (98) (c) $ 41 The amount of total gains included in income attributed to the change in unrealized gains related to assets and liabilities as of March 31, 2023 $ 1 $ — $ 1 Exelon ComEd PHI and Pepco Three Months Ended March 31, 2022 Total Mark-to-Market Life Insurance Contracts Balance as of December 31, 2021 $ (182) $ (219) $ 35 Total realized / unrealized gains Included in net income (a) 1 — 1 Included in regulatory assets 75 75 (b) — Transfers out of Level 3 (1) — — Balance as of March 31, 2022 $ (107) $ (144) $ 36 The amount of total gains included in income attributed to the change in unrealized gain related to assets and liabilities as of March 31, 2022 $ 1 $ — $ 1 __________ (a) Classified in Operating and maintenance expense in the Consolidated Statements of Operations and Comprehensive Income. (b) Includes $25 million of decreases in fair value and an increase for realized gains due to settlements of $11 million recorded in Purchased power expense associated with floating-to-fixed energy swap contracts with unaffiliated suppliers for the three months ended March 31, 2023. Includes $69 million of increases in fair value and an increase for realized losses due to settlements of $6 million recorded in Purchased power expense associated with floating-to-fixed energy swap contracts with unaffiliated suppliers for the three months ended March 31, 2022. (c) The balance consists of a current and noncurrent liability of $22 million and $76 million, respectively, as of March 31, 2023.
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 March 31, 2023 Fair Value as of December 31, 2022 Valuation Unobservable 2023 Range & Arithmetic Average 2022 Range & Arithmetic Average Mark-to-market derivatives $ (98) $ (84) Discounted Forward power price (a) $22.49 - $83.26 $47.69 $34.78 - $75.71 $48.44 ________ (a) An increase to the forward power price would increase the fair value.

Commitments and Contingencies_2

Commitments and Contingencies (Tables)	3 Months Ended
Commitments and Contingencies (Tables)	Mar. 31, 2023
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 March 31, 2023: Description Exelon PHI Pepco DPL ACE Total commitments $ 513 $ 320 $ 120 $ 89 $ 111 Remaining commitments (a) 48 42 37 3 2 __________ (a) Remaining commitments extend through 2026 and include rate credits, energy efficiency programs and delivery system modernization.
Commercial Commitments	The Registrants’ commercial commitments as of March 31, 2023, representing commitments potentially triggered by future events were as follows: Expiration within Total 2023 2024 2025 2026 2027 2028 and beyond Exelon Letters of credit $ 19 $ 17 $ 2 $ — $ — $ — $ — Surety bonds (a) 205 190 15 — — — — Financing trust guarantees 378 — — — — — 378 Guaranteed lease residual values (b) 29 — 5 6 5 4 9 Total commercial commitments $ 631 $ 207 $ 22 $ 6 $ 5 $ 4 $ 387 ComEd Letters of credit $ 12 $ 10 $ 2 $ — $ — $ — $ — Surety bonds (a) 47 42 5 — — — — Financing trust guarantees 200 — — — — — 200 Total commercial commitments $ 259 $ 52 $ 7 $ — $ — $ — $ 200 PECO Letters of credit $ 1 $ 1 $ — $ — $ — $ — $ — Surety bonds (a) 2 1 1 — — — — Financing trust guarantees 178 — — — — — 178 Total commercial commitments $ 181 $ 2 $ 1 $ — $ — $ — $ 178 BGE Letters of credit $ 2 $ 2 $ — $ — $ — $ — $ — Surety bonds (a) 3 2 1 — — — — Total commercial commitments $ 5 $ 4 $ 1 $ — $ — $ — $ — PHI Surety bonds (a) $ 95 $ 90 $ 5 $ — $ — $ — $ — Guaranteed lease residual values (b) 29 — 5 6 5 4 9 Total commercial commitments $ 124 $ 90 $ 10 $ 6 $ 5 $ 4 $ 9 Pepco Surety bonds (a) $ 84 $ 84 $ — $ — $ — $ — $ — Guaranteed lease residual values (b) 10 — 2 2 2 1 3 Total commercial commitments $ 94 $ 84 $ 2 $ 2 $ 2 $ 1 $ 3 DPL Surety bonds (a) $ 6 $ 2 $ 4 $ — $ — $ — $ — Guaranteed lease residual values (b) 12 — 2 2 2 2 4 Total commercial commitments $ 18 $ 2 $ 6 $ 2 $ 2 $ 2 $ 4 ACE Surety bonds (a) $ 5 $ 4 $ 1 $ — $ — $ — $ — Guaranteed lease residual values (b) 7 — 1 2 1 1 2 Total commercial commitments $ 12 $ 4 $ 2 $ 2 $ 1 $ 1 $ 2 __________ (a) Surety bonds — Guarantees issued related to contract and commercial agreements, excluding bid bonds. (b) Represents the maximum potential obligation in the event that the fair value of certain leased equipment and fleet vehicles is zero at the end of the maximum lease term. The lease term associated with these assets ranges from 1 to 9 years. The maximum potential obligation at the end of the minimum lease term would be $65 million guaranteed by Exelon and PHI, of which $21 million, $27 million, and $17 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 March 31, 2023 and December 31, 2022, 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: March 31, 2023 December 31, 2022 Total environmental Portion of total related to Total environmental Portion of total related to Exelon $ 421 $ 343 $ 409 $ 355 ComEd 313 312 325 324 PECO 25 23 25 23 BGE 9 8 9 8 PHI 70 — 46 — Pepco 68 — 44 — DPL 1 — 1 — ACE 1 — 1 —

Changes in Accumulated Other _2

Changes in Accumulated Other Comprehensive Income (Tables)	3 Months Ended
Changes in Accumulated Other Comprehensive Income (Tables)	Mar. 31, 2023
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 March 31, 2023 Cash Flow Hedges Pension and Non-Pension Postretirement Benefit Plan Items (a) Foreign Total Balance as of December 31, 2022 $ 2 $ (640) $ — $ (638) OCI before reclassifications 6 (10) — (4) Amounts reclassified from AOCI — 3 — 3 Net current-period OCI 6 (7) — (1) Balance as of March 31, 2023 $ 8 $ (647) $ — $ (639) Three Months Ended March 31, 2022 Cash Flow Hedges Pension and Non-Pension Postretirement Benefit Plan Items (a) Foreign Total Balance as of December 31, 2021 $ (6) $ (2,721) $ (23) $ (2,750) Separation of Constellation 6 1,994 23 2,023 Amounts reclassified from AOCI — 14 — 14 Net current-period OCI — 14 — 14 Balance as of March 31, 2022 $ — $ (713) $ — $ (713) __________
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 March 31, 2023 2022 Pension and non-pension postretirement benefit plans: Actuarial loss reclassified to periodic benefit cost $ (1) $ (5) Pension and non-pension postretirement benefit plans valuation adjustment 3 — Unrealized gain on cash flow hedges (1) —

Supplemental Financial Inform_2

Supplemental Financial Information (Tables)	3 Months Ended
Supplemental Financial Information (Tables)	Mar. 31, 2023
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 March 31, 2023 Utility taxes (a) $ 220 $ 74 $ 40 $ 29 $ 77 $ 68 $ 8 $ 1 Property 99 10 4 50 35 24 11 — Payroll 32 7 5 5 7 2 1 1 Three Months Ended March 31, 2022 Utility taxes (a) $ 221 $ 78 $ 38 $ 27 $ 78 $ 70 $ 7 $ 1 Property 94 10 4 46 34 23 10 1 Payroll 37 7 4 4 7 2 1 1 _________ (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 March 31, 2023 AFUDC — Equity $ 38 $ 10 $ 6 $ 3 $ 19 $ 14 $ 2 $ 3 Non-service net periodic benefit cost (1) — — — — — — — Three Months Ended March 31, 2022 AFUDC — Equity $ 36 $ 8 $ 7 $ 6 $ 15 $ 11 $ 2 $ 2 Non-service net periodic benefit cost 17 — — — — — — —
Cash Flow Supplemental Disclosures	The following tables provide additional information about material items recorded in the Registrants' Consolidated Statements of Cash Flows. Depreciation, amortization, and accretion Exelon (a) ComEd PECO BGE PHI Pepco DPL ACE Three Months Ended March 31, 2023 Property, plant, and equipment (b) $ 680 $ 267 $ 95 $ 124 $ 180 $ 76 $ 51 $ 47 Amortization of regulatory assets (b) 178 71 3 43 61 32 9 20 Amortization of intangible assets, net (b) 2 — — — — — — — Total depreciation and amortization $ 860 $ 338 $ 98 $ 167 $ 241 $ 108 $ 60 $ 67 Three Months Ended March 31, 2022 Property, plant, and equipment (b) $ 726 $ 254 $ 88 $ 117 $ 164 $ 72 $ 45 $ 41 Amortization of regulatory assets (b) 179 67 4 54 54 36 12 6 Amortization of intangible assets, net (b) 6 — — — — — — — Amortization of energy contract assets and liabilities (c) 3 — — — — — — — Nuclear fuel (d) 66 — — — — — — — ARO accretion (e) 44 — — — — — — — Total depreciation, amortization, and accretion $ 1,024 $ 321 $ 92 $ 171 $ 218 $ 108 $ 57 $ 47 __________ (a) Exelon's 2022 amounts include amounts related to Generation prior to the separation. See Note 2 — Discontinued Operations for additional information. (b) Included in Depreciation and amortization in the Registrants' Consolidated Statements of Operations and Comprehensive Income. (c) Included in Electric operating revenues or Purchased power expense in Exelon’s Consolidated Statements of Operations and Comprehensive Income. (d) Included in Purchased fuel expense in Exelon's Consolidated 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 Three Months Ended March 31, 2023 Pension and OPEB costs (benefit) $ 45 $ 6 $ (3) $ 14 $ 24 $ 8 $ 4 $ 4 Allowance for credit losses 70 — 37 18 15 7 5 3 True-up adjustments to decoupling mechanisms and formula rates (b) (282) (153) 4 (65) (68) (39) (11) (18) Long-term incentive plan 2 — — — — — — — Amortization of operating ROU asset 10 1 — 1 7 1 2 1 Change in environmental liabilities 25 — — — 25 25 — — AFUDC — Equity (38) (10) (6) (3) (19) (14) (2) (3) Three Months Ended March 31, 2022 Pension and OPEB costs (benefit) $ 44 $ 16 $ (2) $ 12 $ 13 $ 2 $ 1 $ 3 Allowance for credit losses 78 17 27 18 18 9 6 3 Other decommissioning-related activity 36 — — — — — — — Energy-related options 60 — — — — — — — True-up adjustments to decoupling mechanisms and formula rates (b) (29) (40) (6) 12 5 7 1 (3) Long-term incentive plan 25 — — — — — — — Amortization of operating ROU asset 23 1 — 7 7 2 2 1 AFUDC — Equity (36) (8) (7) (6) (15) (11) (2) (2) __________ (a) Exelon's 2022 amounts include amounts related to Generation prior to the separation. See Note 2 — Discontinued Operations for additional information. (b) For ComEd, reflects the true-up adjustments in regulatory assets and liabilities associated with its distribution, energy efficiency, distributed generation, and transmission formula rates. For PECO, reflects the change in regulatory assets and liabilities associated with its transmission formula rates. For BGE, Pepco, DPL, and ACE, reflects the change in regulatory assets and liabilities associated with their decoupling mechanisms and transmission formula rates. See Note 3 — Regulatory Matters of the 2022 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 March 31, 2023 Cash and cash equivalents $ 522 $ 75 $ 27 $ 20 $ 367 $ 126 $ 142 $ 71 Restricted cash and cash equivalents 381 323 9 1 29 27 1 — Restricted cash included in other deferred debits and other assets 180 180 — — — — — — Total cash, restricted cash, and cash equivalents $ 1,083 $ 578 $ 36 $ 21 $ 396 $ 153 $ 143 $ 71 December 31, 2022 Cash and cash equivalents $ 407 $ 67 $ 59 $ 43 $ 198 $ 45 $ 31 $ 72 Restricted cash and cash equivalents 566 327 9 24 175 54 121 — Restricted cash included in other deferred debits and other assets 117 117 — — — — — — Total cash, restricted cash, and cash equivalents $ 1,090 $ 511 $ 68 $ 67 $ 373 $ 99 $ 152 $ 72 March 31, 2022 Cash and cash equivalents $ 2,476 $ 343 $ 26 $ 41 $ 796 $ 502 $ 120 $ 168 Restricted cash and cash equivalents 430 246 8 34 106 34 73 — Restricted cash included in other deferred debits and other assets 92 92 — — — — — — Total cash, restricted cash, and cash equivalents $ 2,998 $ 681 $ 34 $ 75 $ 902 $ 536 $ 193 $ 168 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 deferred debits and other 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 For additional information on restricted cash see Note 1 — Significant Accounting Policies of the 2022 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 March 31, 2023 Compensation-related accruals (a) $ 359 $ 107 $ 43 $ 42 $ 59 $ 18 $ 11 $ 10 Taxes accrued 214 102 3 83 94 67 14 16 Interest accrued 373 78 44 45 75 35 22 16 December 31, 2022 Compensation-related accruals (a) $ 613 $ 179 $ 81 $ 79 $ 104 $ 29 $ 20 $ 16 Taxes accrued 211 92 10 34 70 52 8 12 Interest accrued 338 124 47 42 61 32 9 14 __________ (a) Primarily includes accrued payroll, bonuses and other incentives, vacation, and benefits.

Related Party Transactions (Tab

Related Party Transactions (Tables)	3 Months Ended
Related Party Transactions (Tables)	Mar. 31, 2023
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 affiliate and an immaterial amount recorded as Operating and maintenance expense from affiliates at the Utility Registrants. Effective February 1, 2022, Generation is no longer considered a related party. Three Months Ended March 31, 2022 ComEd (a) $ 59 PECO (b) 33 BGE (c) 18 PHI 51 Pepco (d) 39 DPL (e) 10 ACE (f) 2 __________ (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 March 31, Three Months Ended March 31, 2023 2022 2023 2022 Exelon BSC $ 175 $ 205 PHISCO 24 19 ComEd BSC $ 83 $ 85 81 85 PECO BSC 51 49 30 36 BGE BSC 54 51 24 38 PHI BSC 42 50 40 46 PHISCO — — 24 19 Pepco BSC 27 29 14 17 PHISCO 30 29 11 8 DPL BSC 17 18 10 14 PHISCO 24 24 7 6 ACE BSC 14 15 14 15 PHISCO 22 21 6 5
Current Receivables From/Payables To Affiliates	The following tables present current Receivables from affiliates and current Payables to affiliates: March 31, 2023 Receivables from affiliates: Payables to affiliates: ComEd PECO BGE Pepco DPL ACE BSC PHISCO Other Total ComEd $ — $ — $ — $ — $ — $ 78 $ — $ 6 $ 84 PECO $ — — — — 1 39 — 8 48 BGE — — — — — 35 — 2 37 PHI — — — — — — 7 — 10 17 Pepco — — — — — 22 15 1 38 DPL — 1 — — — 13 12 — 26 ACE — 1 — 1 — 13 11 — 26 Other 3 — — — — 1 — 1 5 Total $ 3 $ 2 $ — $ 1 $ — $ 2 $ 207 $ 39 $ 27 $ 281 December 31, 2022 Receivables from affiliates: Payables to affiliates: ComEd PECO BGE Pepco DPL ACE BSC PHISCO Other Total ComEd $ — $ — $ — $ — $ — $ 66 $ — $ 8 $ 74 PECO $ — — — — — 39 — 3 42 BGE — — — — — 38 — 1 39 PHI — — — — — — 4 — 10 14 Pepco — — — — — 20 13 1 34 DPL — 2 — — — 12 8 — 22 ACE — 2 — — — 14 9 1 26 Other 3 — — — — 1 — — 4 Total $ 3 $ 4 $ — $ — $ — $ 1 $ 193 $ 30 $ 24 $ 255
Long Term Debt to Financing Trusts	The following table presents Long-term debt to financing trusts: March 31, 2023 December 31, 2022 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

Discontinued Operations and Dis

Discontinued Operations and Disposal Groups (Details) - USD ($) $ in Millions	2 Months Ended	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2023	Feb. 01, 2022
Discontinued Operations - Income Statement
Discontinued Operation, Intra-Entity Amounts, Discontinued Operation after Disposal, Expense	$ 56	$ 50
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	$ 9	$ 6

Discontinued Operations and D_2

Discontinued Operations and Disposal Groups (Details) - Income Statement - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Discontinued Operations - Income Statement
Operating and maintenance	$ 1,151	$ 1,178
Cost, Depreciation and Amortization	860	817
Taxes, Miscellaneous	355	354
Costs and Expenses	4,457	4,427
Other, net	109	137
Nonoperating Income (Expense)	(303)	(201)
Income taxes	134	218
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	0	117
Net income (loss) attributable to noncontrolling interests	0	1
Net Income (Loss) from Discontinued Operations Available to Common Shareholders, Basic	0	116
Total transaction and transition costs incurred related to the Separation		52
Exelon Generation Co L L C [Member]
Discontinued Operations - Income Statement
Revenue from Contract with Customer, Including Assessed Tax	0	1,855
Revenue from Related Parties	0	161
Disposal Group, Including Discontinued Operation, Revenue	0	2,016
Purchased power and/or fuel	0	1,138
Operating and maintenance	0	371
Cost, Depreciation and Amortization	0	94
Taxes, Miscellaneous	0	44
Costs and Expenses	0	1,647
Gain (Loss) on Disposition of Assets	0	10
Disposal Group, Including Discontinued Operation, Operating Income (Loss)	0	379
Disposal Group, Including Discontinued Operation, Interest Expense	0	(20)
Other, net	0	(281)
Nonoperating Income (Expense)	0	(301)
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax	0	78
Income taxes	0	(40)
Income (Loss) from Equity Method Investments	0	(1)
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	0	117
Net income (loss) attributable to noncontrolling interests	0	1
Net Income (Loss) from Discontinued Operations Available to Common Shareholders, Basic	$ 0	$ 116

Discontinued Operations and D_3

Discontinued Operations and Disposal Groups (Details) - Balance Sheet - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2021
Discontinued Operations - Income Statement
Restricted cash	$ 381	$ 566	$ 430	$ 321
Customer accounts receivable	2,493	2,544
Accounts Receivable, Allowance for Credit Loss, Current	(389)	(327)
Other accounts receivable	1,346	1,426
Allowance for Credit Loss, Receivable, Other, Current	(91)	(82)
Other Receivables, Net, Current	1,255	1,344
Fossil fuel and emission allowances	70	208
Materials and supplies inventory, net	582	547
Accumulated depreciation and amortization	16,384	15,930
Investments	234	232
Other Assets, Noncurrent	1,220	1,141
Assets	96,925	95,349
Short-term Debt	1,306	2,586
Long-term Debt and Lease Obligation, Current	1,356	1,802
Mark-to-market derivative liabilities (current liabilities)	23	8
Long-term Debt, Excluding Current Maturities	38,732	35,272
Deferred income taxes and unamortized investment tax credits	11,483	11,250
Asset retirement obligations, noncurrent	270	269
Derivative Liability, Noncurrent	77	83
Other	1,869	1,967
Total Liabilities	71,859	70,605
Exelon Generation Co L L C [Member]
Discontinued Operations - Income Statement
Assets	0	0
Total Liabilities	$ 0	$ 0

Discontinued Operations and D_4

Discontinued Operations and Disposal Groups (Details) - Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Discontinued Operations - Income Statement
Depreciation, Amortization and Accretion, Net	$ 860	$ 1,024
Gain (Loss) on Sale of Assets and Asset Impairment Charges	0	(10)
Deferred income taxes and amortization of investment tax credits	113	110
Net fair value changes related to derivatives	0	(59)
Net realized and unrealized (gains) losses on NDT funds	0	205
Net unrealized (gains) losses on equity investments	0	16
Other non-cash operating activities	138	(232)
Payments to Acquire Property, Plant, and Equipment	(1,881)	(1,922)
Collection of deferred purchase price	0	169
Decrease in capital expenditures not paid	(201)	(322)
Increase in deferred purchase price	0	348
Increase in PPE related to ARO update	0	(335)
Exelon Generation Co L L C [Member]
Discontinued Operations - Income Statement
Depreciation, Amortization and Accretion, Net	0	207
Gain (Loss) on Sale of Assets and Asset Impairment Charges	0	9
Deferred income taxes and amortization of investment tax credits	0	(143)
Net fair value changes related to derivatives	0	(59)
Net realized and unrealized (gains) losses on NDT funds	0	205
Net unrealized (gains) losses on equity investments	0	16
Other non-cash operating activities	0	36
Payments to Acquire Property, Plant, and Equipment	0	(227)
Collection of deferred purchase price	0	169
Decrease in capital expenditures not paid	0	(128)
Increase in deferred purchase price	0	348
Increase in PPE related to ARO update	$ 0	$ 335

Regulatory Matters - Schedule o

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

Dec. 14, 2022 USD ($)

Nov. 17, 2022 USD ($)

Oct. 27, 2022 USD ($)

May 19, 2022 USD ($)

Apr. 15, 2022 USD ($)

Mar. 31, 2022 USD ($)

Feb. 23, 2022

Feb. 03, 2022

Dec. 22, 2021

Jun. 28, 2021 USD ($)

Mar. 31, 2021 USD ($)

Dec. 16, 2020 USD ($)

Sep. 11, 2020 USD ($)

Regulatory Matters Completed Rate Cases [Line Items]

Basis points for ComEd's Revenue Requirement

580

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

Regulatory Matters Completed Rate Cases [Line Items]

Requested Revenue Requirement Increase (Decrease)

$ 199

Approved Revenue Requirement Increase (Decrease)

$ 199

Approved Return on Equity, Percentage

7.85%

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

Regulatory Matters Completed Rate Cases [Line Items]

Approved Return on Equity, Percentage

7.78%

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

$ 55

Public Utilities, Approved Equity Capital Structure, Percentage

5.91%

Basis points for ComEd's Revenue Requirement

580

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

Regulatory Matters Completed Rate Cases [Line Items]

Approved Revenue Requirement Increase (Decrease)

$ 144

Approved Return on Equity, Percentage

7.85%

Public Utilities, Approved Equity Capital Structure, Percentage

5.94%

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 Completed Rate Cases [Line Items]

Basis points for ComEd's Revenue Requirement

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

Regulatory Matters Completed Rate Cases [Line Items]

Requested Revenue Requirement Increase (Decrease)

$ 82

Approved Revenue Requirement Increase (Decrease)

$ 55

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

Regulatory Matters Completed Rate Cases [Line Items]

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

$ 203

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 Natural 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 Natural 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 Natural 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 Natural 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 Natural 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%

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

Regulatory Matters Completed Rate Cases [Line Items]

Requested Revenue Requirement Increase (Decrease)

$ 29

$ 38

Approved Return on Equity, Percentage

9.60%

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

Regulatory Matters Completed Rate Cases [Line Items]

Approved Revenue Requirement Increase (Decrease)

$ 17

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

Regulatory Matters Completed Rate Cases [Line Items]

Approved Revenue Requirement Increase (Decrease)

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

Regulatory Matters Completed Rate Cases [Line Items]

Approved Revenue Requirement Increase (Decrease)

$ 6

Regulatory Matters - Schedule_2

Regulatory Matters - Schedule of Pending Rate Cases (Details) $ in Millions								3 Months Ended
	Apr. 21, 2023 USD ($)	Apr. 13, 2023 USD ($)	Feb. 28, 2023 USD ($)	Feb. 17, 2023 USD ($)	Feb. 15, 2023 USD ($)	Jan. 17, 2023 USD ($)	Feb. 03, 2022	Mar. 31, 2023 USD ($)	Mar. 31, 2022 USD ($)
Regulatory Matters Pending Rate Cases [Line Items]
Basis points for ComEd's Revenue Requirement							580
Commonwealth Edison Co [Member] \| Illinois 2023 Electric Distribution Base Rate Case
Regulatory Matters Pending Rate Cases [Line Items]
Requested Revenue Requirement Increase (Decrease)						$ 1,472
Commonwealth Edison Co [Member] \| Illinois 2023 Electric Distribution Base Rate Case \| Minimum [Member]
Regulatory Matters Pending Rate Cases [Line Items]
Public Utilities, Requested Equity Capital Structure, Percentage						50.58%
Commonwealth Edison Co [Member] \| Illinois 2023 Electric Distribution Base Rate Case \| Maximum [Member]
Regulatory Matters Pending Rate Cases [Line Items]
Public Utilities, Requested Equity Capital Structure, Percentage						51.19%
Commonwealth Edison Co [Member] \| Illinois 2023 Electric Distribution Base Rate Case \| 2023
Regulatory Matters Pending Rate Cases [Line Items]
Public Utilities, Requested Equity Capital Structure, Percentage						7.43%
Commonwealth Edison Co [Member] \| Illinois 2023 Electric Distribution Base Rate Case \| 2024
Regulatory Matters Pending Rate Cases [Line Items]
Requested Return on Equity, Percentage						10.50%
Public Utilities, Requested Rate Increase (Decrease), Initial Revenue Requirement, Amount						$ 877
Commonwealth Edison Co [Member] \| Illinois 2023 Electric Distribution Base Rate Case \| 2025
Regulatory Matters Pending Rate Cases [Line Items]
Requested Return on Equity, Percentage						10.55%
Public Utilities Requested Rate Increase (Decrease), Prior Year Annual Reconciliation						$ 175
Public Utilities, Requested Equity Capital Structure, Percentage						7.50%
Commonwealth Edison Co [Member] \| Illinois 2023 Electric Distribution Base Rate Case \| 2026
Regulatory Matters Pending Rate Cases [Line Items]
Requested Return on Equity, Percentage						10.60%
Public Utilities, Requested Rate Increase (Decrease), Initial Revenue Requirement, Amount						$ 217
Public Utilities, Requested Equity Capital Structure, Percentage						7.62%
Public Utilities, Requested Rate Increase (Decrease), Proposed Revenue Requirement Phase-In						$ 307
Commonwealth Edison Co [Member] \| Illinois 2023 Electric Distribution Base Rate Case \| 2027
Regulatory Matters Pending Rate Cases [Line Items]
Requested Return on Equity, Percentage						10.65%
Public Utilities, Requested Rate Increase (Decrease), Initial Revenue Requirement, Amount						$ 203
Public Utilities, Requested Equity Capital Structure, Percentage						7.70%
Commonwealth Edison Co [Member] \| Illinois 2023 Electric Distribution Reconciliation Rate Case \| Subsequent Event [Member] \| 2022
Regulatory Matters Pending Rate Cases [Line Items]
Public Utilities Requested Rate Increase (Decrease), Prior Year Annual Reconciliation	$ 247
Public Utilities, Approved Return on Equity, Percentage	8.91%
Baltimore Gas and Electric Company [Member] \| Maryland 2023 Electric Distribution Base Rate Case
Regulatory Matters Pending Rate Cases [Line Items]
Requested Revenue Requirement Increase (Decrease)				$ 313
Requested Return on Equity, Percentage				10.40%
Baltimore Gas and Electric Company [Member] \| Maryland 2023 Electric Distribution Base Rate Case \| 2024
Regulatory Matters Pending Rate Cases [Line Items]
Requested Revenue Requirement Increase (Decrease)				$ 85
Baltimore Gas and Electric Company [Member] \| Maryland 2023 Electric Distribution Base Rate Case \| 2025
Regulatory Matters Pending Rate Cases [Line Items]
Requested Revenue Requirement Increase (Decrease)				103
Baltimore Gas and Electric Company [Member] \| Maryland 2023 Electric Distribution Base Rate Case \| 2026
Regulatory Matters Pending Rate Cases [Line Items]
Requested Revenue Requirement Increase (Decrease)				125
Baltimore Gas and Electric Company [Member] \| Maryland 2023 Gas Distribution Base Rate Case
Regulatory Matters Pending Rate Cases [Line Items]
Requested Revenue Requirement Increase (Decrease)				$ 289
Requested Return on Equity, Percentage				10.40%
Baltimore Gas and Electric Company [Member] \| Maryland 2023 Gas Distribution Base Rate Case \| 2024
Regulatory Matters Pending Rate Cases [Line Items]
Requested Revenue Requirement Increase (Decrease)				$ 158
Baltimore Gas and Electric Company [Member] \| Maryland 2023 Gas Distribution Base Rate Case \| 2025
Regulatory Matters Pending Rate Cases [Line Items]
Requested Revenue Requirement Increase (Decrease)				77
Baltimore Gas and Electric Company [Member] \| Maryland 2023 Gas Distribution Base Rate Case \| 2026
Regulatory Matters Pending Rate Cases [Line Items]
Requested Revenue Requirement Increase (Decrease)				$ 54
Baltimore Gas and Electric Company [Member] \| Maryland 2023 Electric Distribution Reconciliation Rate Case \| 2022
Regulatory Matters Pending Rate Cases [Line Items]
Requested Revenue Requirement Increase (Decrease)								$ 44
Baltimore Gas and Electric Company [Member] \| Maryland 2023 Electric Distribution Reconciliation Rate Case \| 2021
Regulatory Matters Pending Rate Cases [Line Items]
Requested Revenue Requirement Increase (Decrease)									$ 11
Baltimore Gas and Electric Company [Member] \| Maryland 2023 Gas Distribution Reconciliation Rate Case \| 2022
Regulatory Matters Pending Rate Cases [Line Items]
Requested Revenue Requirement Increase (Decrease)								$ 15
Baltimore Gas and Electric Company [Member] \| Maryland 2023 Gas Distribution Reconciliation Rate Case \| 2021
Regulatory Matters Pending Rate Cases [Line Items]
Requested Revenue Requirement Increase (Decrease)									$ 7
Potomac Electric Power Company [Member] \| District of Columbia 2023 Electric Distribution Base Rate Case
Regulatory Matters Pending Rate Cases [Line Items]
Requested Revenue Requirement Increase (Decrease), Amended		$ 191
Requested Return on Equity, Percentage		10.50%
Potomac Electric Power Company [Member] \| District of Columbia 2023 Electric Distribution Base Rate Case \| 2024
Regulatory Matters Pending Rate Cases [Line Items]
Requested Revenue Requirement Increase (Decrease)		$ 117
Potomac Electric Power Company [Member] \| District of Columbia 2023 Electric Distribution Base Rate Case \| 2025
Regulatory Matters Pending Rate Cases [Line Items]
Requested Revenue Requirement Increase (Decrease)		37
Potomac Electric Power Company [Member] \| District of Columbia 2023 Electric Distribution Base Rate Case \| 2026
Regulatory Matters Pending Rate Cases [Line Items]
Requested Revenue Requirement Increase (Decrease)		$ 37
Delmarva Power and Light Company [Member] \| Delaware DE 2022 Electric Distribution Base Rate Case
Regulatory Matters Pending Rate Cases [Line Items]
Requested Revenue Requirement Increase (Decrease), Amended			$ 48
Requested Return on Equity, Percentage			10.50%
Atlantic City Electric Company [Member] \| New Jersey 2023 Electric Distribution Base Rate Case
Regulatory Matters Pending Rate Cases [Line Items]
Requested Revenue Requirement Increase (Decrease), Amended					$ 105
Requested Return on Equity, Percentage					10.50%

Regulatory Matters - Annual Ele

Regulatory Matters - Annual Electric Transmission Fillings (Details) - Baltimore Gas and Electric Company [Member] $ in Millions	Apr. 25, 2023 USD ($)	May 27, 2022
2023 Transmission Formula Rate Annual Update [Domain]
Public Utilities, General Disclosures [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount	$ 19
Annual Reconciliation Increase	(12)
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount	$ 4
Public Utilities, Approved Equity Capital Structure, Percentage	7.34%
Public Utilities, Approved Return on Equity, Percentage	10.50%
Basis points for Transmission Formula Rate		50
2023 Transmission Formula Rate Revenue Reduction
Public Utilities, General Disclosures [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount	$ 3

Regulatory Matters - Energy Eff

Regulatory Matters - Energy Efficiency Formula Rate (Details)	Feb. 03, 2022
Schedule of Energy Efficiency Formula Rate Updates [Line Items]
Basis points for ComEd's Revenue Requirement	580

Regulatory Matters - Capitalize

Regulatory Matters - Capitalized Ratemaking Amount Not Recognized (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Public Utility, Property, Plant and Equipment [Line Items]
Public Utilities, Amount of Allowance for Earnings on Equity Capitalized for Rate Making Purposes	$ 53	$ 57
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	13	8
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	26	28
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	14	21
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	18
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	$ 1	$ 1

Regulatory Matters - Narrative

Regulatory Matters - Narrative (Details) $ in Millions			3 Months Ended	36 Months Ended
Regulatory Matters - Narrative (Details) $ in Millions	Sep. 27, 2022	Feb. 03, 2022	Mar. 31, 2023 USD ($)	Dec. 31, 2025 USD ($)	Mar. 31, 2022 USD ($)
Regulatory Matters Additional Narrative Information [Line Items]
Basis points for ComEd's Revenue Requirement		580
Commonwealth Edison Co [Member]
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Assets			$ 547
Beneficial electrification planned expenditure				$ 300
Maximum increase of revenue requirement			105%
Basis Points - ComEd Symmetrical Performance Adjustments	32
Beneficial electrification planned expenditure, annual				100
Beneficial electrification approved annual spending				$ 77
Commonwealth Edison Co [Member] \| Carbon Mitigation Credit rider
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Assets			$ 275
Regulatory Assets			1,118
Commonwealth Edison Co [Member] \| Electric Distribution Formula Rate Annual Reconciliations
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Assets			143
PECO Energy Co [Member]
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Assets			44
Increase (Decrease) in Regulatory Liabilities			45
PECO Energy Co [Member] \| Nuclear Decommissioning [Member]
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Liabilities			28
PECO Energy Co [Member] \| Electric Energy and Natural Gas Cost [Member]
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Liabilities			31
PECO Energy Co [Member] \| Deferred Income Tax Charge [Member]
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Assets			48
Baltimore Gas and Electric Company [Member]
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Assets			66
Baltimore Gas and Electric Company [Member] \| Under-recovered revenue decoupling
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Assets			54
Delmarva Power and Light Company [Member]
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Assets			(17)
Delmarva Power and Light Company [Member] \| Electric Energy and Natural Gas Cost [Member]
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Assets			(18)
Atlantic City Electric Company [Member]
Regulatory Matters Additional Narrative Information [Line Items]
Contract Termination Liability			118		$ 203
Increase (Decrease) in Regulatory Assets			(18)
Increase (Decrease) in Regulatory Liabilities			(19)
Gain (Loss) on Contract Termination			19
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			31
Atlantic City Electric Company [Member] \| Electric Energy Costs
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Assets			(35)
Atlantic City Electric Company [Member] \| Over-recovered revenue decoupling
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Liabilities			$ 9

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
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022	Dec. 31, 2021
Contract Liabilities [Roll Forward]
Contract with Customer, Liability, Current	$ 100	$ 107	$ 101	$ 109
Revenues recognized, contract liabilities	(1)	(2)
Pepco Holdings LLC [Member]
Contract Liabilities [Roll Forward]
Contract with Customer, Liability, Current	100	107	101	109
Revenues recognized, contract liabilities	(1)	(2)
Potomac Electric Power Company [Member]
Contract Liabilities [Roll Forward]
Contract with Customer, Liability, Current	80	85	81	87
Revenues recognized, contract liabilities	(1)	(2)
Delmarva Power and Light Company [Member]
Contract Liabilities [Roll Forward]
Contract with Customer, Liability, Current	10	11	10	11
Revenues recognized, contract liabilities	0	0
Atlantic City Electric Company [Member]
Contract Liabilities [Roll Forward]
Contract with Customer, Liability, Current	10	11	$ 10	$ 11
Revenues recognized, contract liabilities	$ 0	$ 0

Revenue from Contract with Cust

Revenue from Contract with Customer - Performance Obligations (Details) $ in Millions	Mar. 31, 2023 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 100
Pepco Holdings LLC [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	100
Potomac Electric Power Company [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	80
Delmarva Power and Light Company [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	10
Atlantic City Electric Company [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	10
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-04-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 7
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	9 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-04-01 \| Pepco Holdings LLC [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 7
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	9 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-04-01 \| 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	9 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-04-01 \| 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	9 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-04-01 \| 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	9 months
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	$ 5
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01 \| Pepco Holdings LLC [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 5
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01 \| Potomac Electric Power Company [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 5
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01 \| Delmarva Power 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]: 2026-01-01 \| Atlantic City Electric Company [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 0
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 77
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01 \| Pepco Holdings LLC [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 77
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01 \| Potomac Electric Power Company [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 60
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01 \| Delmarva Power 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]: 2027-01-01 \| Atlantic City Electric Company [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 8
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year

Segment Information - Narrative

Segment Information - Narrative (Details)	3 Months Ended
Segment Information - Narrative (Details)	Mar. 31, 2023 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
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Segment Reporting Information [Line Items]
Revenues	$ 5,563	$ 5,327
Income (Loss) before income taxes	803	699
Income taxes	134	218
Net income (loss)	669	598
Capital expenditures	1,881	1,922
Assets	96,925		$ 95,349
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	669	481
Pepco Holdings LLC [Member]
Segment Reporting Information [Line Items]
Revenues	1,536	1,404
Revenue from Related Parties	3	3
Income (Loss) before income taxes	189	137
Income taxes	34	7
Net income (loss)	155	130
Capital expenditures	561	409
Assets	26,208		26,082
Operating Segment [Member]
Segment Reporting Information [Line Items]
Revenues	5,563	5,327
Revenue from Related Parties	0	6
Depreciation and Amortization	860	817
Operating Expenses	4,457	4,427
Interest expense, net	412	338
Income (Loss) before income taxes	803	699
Income taxes	134	218
Capital expenditures	1,881	1,695
Assets	96,925		95,349
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	669	481
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenues	(446)	(588)
Revenue from Related Parties	(445)	(587)
Depreciation and Amortization	0	0
Operating Expenses	(447)	(531)
Interest expense, net	0	0
Income (Loss) before income taxes	0	(43)
Income taxes	0	(10)
Capital expenditures	0	0
Assets	(4,194)		(4,260)
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	0	(33)
Intersegment Eliminations [Member] \| Pepco Holdings LLC [Member]
Segment Reporting Information [Line Items]
Revenues	(103)	(97)
Revenue from Related Parties	(103)	(97)
Depreciation and Amortization	0	0
Operating Expenses	(103)	(97)
Interest expense, net	0	0
Income (Loss) before income taxes	0	0
Income taxes	0	0
Net income (loss)	0	0
Capital expenditures	0	0
Assets	(42)		(33)
Commonwealth Edison Co [Member] \| Operating Segment [Member]
Segment Reporting Information [Line Items]
Revenues	1,667	1,734
Depreciation and Amortization	338	321
Operating Expenses	1,256	1,406
Interest expense, net	117	100
Income (Loss) before income taxes	312	240
Income taxes	71	52
Capital expenditures	617	617
Assets	40,720		39,661
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	241	188
Commonwealth Edison Co [Member] \| Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue from Related Parties	3	6
PECO Energy Co [Member] \| Operating Segment [Member]
Segment Reporting Information [Line Items]
Revenues	1,112	1,047
Depreciation and Amortization	98	92
Operating Expenses	902	793
Interest expense, net	48	41
Income (Loss) before income taxes	170	220
Income taxes	4	14
Capital expenditures	335	344
Assets	14,738		14,502
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	166	206
PECO Energy Co [Member] \| Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue from Related Parties	2	1
Baltimore Gas and Electric Company [Member] \| Operating Segment [Member]
Segment Reporting Information [Line Items]
Revenues	1,257	1,154
Depreciation and Amortization	167	171
Operating Expenses	964	919
Interest expense, net	44	35
Income (Loss) before income taxes	252	207
Income taxes	52	9
Capital expenditures	350	303
Assets	13,411		13,350
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	200	198
Baltimore Gas and Electric Company [Member] \| Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue from Related Parties	3	7
Pepco Holdings LLC [Member] \| Operating Segment [Member]
Segment Reporting Information [Line Items]
Revenues	1,536	1,404
Depreciation and Amortization	241	218
Operating Expenses	1,297	1,215
Interest expense, net	76	69
Income (Loss) before income taxes	189	137
Income taxes	34	7
Net income (loss)	155	130
Capital expenditures	561	409
Assets	26,208		26,082
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	155	130
Pepco Holdings LLC [Member] \| Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue from Related Parties	3	3
Potomac Electric Power Company [Member] \| Operating Segment [Member]
Segment Reporting Information [Line Items]
Revenues	710	614
Depreciation and Amortization	108	108
Operating Expenses	610	547
Interest expense, net	39	36
Income (Loss) before income taxes	77	44
Income taxes	12	(2)
Net income (loss)	65	46
Capital expenditures	264	218
Assets	10,795		10,657
Potomac Electric Power Company [Member] \| Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue from Related Parties	1	1
Delmarva Power and Light Company [Member] \| Operating Segment [Member]
Segment Reporting Information [Line Items]
Revenues	474	431
Depreciation and Amortization	60	57
Operating Expenses	388	357
Interest expense, net	17	16
Income (Loss) before income taxes	72	60
Income taxes	12	4
Net income (loss)	60	56
Capital expenditures	134	103
Assets	5,804		5,802
Delmarva Power and Light Company [Member] \| Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue from Related Parties	2	1
Atlantic City Electric Company [Member] \| Operating Segment [Member]
Segment Reporting Information [Line Items]
Revenues	353	349
Depreciation and Amortization	67	47
Operating Expenses	298	311
Interest expense, net	16	14
Income (Loss) before income taxes	44	27
Income taxes	11	1
Net income (loss)	33	26
Capital expenditures	161	87
Assets	5,013		4,979
Atlantic City Electric Company [Member] \| Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue from Related Parties	1	1
Corporate and Other [Member] \| Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Revenues	437	576
Depreciation and Amortization	16	15
Operating Expenses	485	625
Interest expense, net	127	93
Income (Loss) before income taxes	(120)	(62)
Income taxes	(27)	146
Capital expenditures	18	22
Assets	6,042		6,014
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	(93)	(208)
Corporate and Other [Member] \| Corporate, Non-Segment [Member] \| Pepco Holdings LLC [Member]
Segment Reporting Information [Line Items]
Revenues	102	107
Depreciation and Amortization	6	6
Operating Expenses	104	97
Interest expense, net	4	3
Income (Loss) before income taxes	(4)	6
Income taxes	(1)	4
Net income (loss)	(3)	2
Capital expenditures	2	1
Assets	4,638		$ 4,677
Corporate and Other [Member] \| Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue from Related Parties	434	576
Corporate and Other [Member] \| Intersegment Eliminations [Member] \| Pepco Holdings LLC [Member]
Segment Reporting Information [Line Items]
Revenue from Related Parties	102	97
Rate-regulated electric revenues [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	4,462	4,481
Rate-regulated electric revenues [Member] \| Pepco Holdings LLC [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	1,371	1,323
Rate-regulated electric revenues [Member] \| Operating Segment [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	4,707	4,522
Rate-regulated electric revenues [Member] \| Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	(5)	(7)
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	(4)	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	1,667	1,734
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	795	741
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	814	736
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	1,436	1,318
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	710	614
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	377	348
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	353	349
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
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
Rate-regulated natural gas revenues [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	822	817
Rate-regulated natural gas revenues [Member] \| Pepco Holdings LLC [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	97	83
Rate-regulated natural gas revenues [Member] \| Operating Segment [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	856	805
Rate-regulated natural gas revenues [Member] \| Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	(1)	(2)
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
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
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	317	306
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	443	418
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	97	83
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
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	97	83
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
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
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
Shared service and other revenues [Member] \| Operating Segment [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	0	0
Shared service and other revenues [Member] \| Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	(440)	(579)
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	(99)	(104)
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
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
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
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	3	3
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
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
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
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	437	576
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	$ 102	$ 107

Segment Information - Electric

Segment Information - Electric and Gas Revenue by Customer Class (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Revenue, Major Customer [Line Items]
Revenues	$ 5,563	$ 5,327
Operating Segment [Member]
Revenue, Major Customer [Line Items]
Revenues	5,563	5,327
Revenue from Related Parties	0	6
Commonwealth Edison Co [Member]
Revenue, Major Customer [Line Items]
Revenues	1,667	1,734
Revenue from Related Parties	3	6
Commonwealth Edison Co [Member] \| Regulated Operation [Member]
Revenue, Major Customer [Line Items]
Revenues	1,508	1,686
Commonwealth Edison Co [Member] \| Other Regulated Revenue [Member]
Revenue, Major Customer [Line Items]
Revenues	159	48
PECO Energy Co [Member]
Revenue, Major Customer [Line Items]
Revenues	1,112	1,047
Revenue from Related Parties	2	1
PECO Energy Co [Member] \| Regulated Operation [Member]
Revenue, Major Customer [Line Items]
Revenues	1,111	1,037
PECO Energy Co [Member] \| Other Regulated Revenue [Member]
Revenue, Major Customer [Line Items]
Revenues	1	10
Baltimore Gas and Electric Company [Member]
Revenue, Major Customer [Line Items]
Revenues	1,257	1,154
Revenue from Related Parties	3	7
Baltimore Gas and Electric Company [Member] \| Regulated Operation [Member]
Revenue, Major Customer [Line Items]
Revenues	1,186	1,160
Baltimore Gas and Electric Company [Member] \| Other Regulated Revenue [Member]
Revenue, Major Customer [Line Items]
Revenues	71	(6)
Pepco Holdings LLC [Member]
Revenue, Major Customer [Line Items]
Revenues	1,536	1,404
Revenue from Related Parties	3	3
Pepco Holdings LLC [Member] \| Regulated Operation [Member]
Revenue, Major Customer [Line Items]
Revenues	1,467	1,408
Pepco Holdings LLC [Member] \| Other Regulated Revenue [Member]
Revenue, Major Customer [Line Items]
Revenues	69	(4)
Potomac Electric Power Company [Member]
Revenue, Major Customer [Line Items]
Revenues	710	614
Revenue from Related Parties	1	1
Potomac Electric Power Company [Member] \| Regulated Operation [Member]
Revenue, Major Customer [Line Items]
Revenues	668	620
Potomac Electric Power Company [Member] \| Other Regulated Revenue [Member]
Revenue, Major Customer [Line Items]
Revenues	42	(6)
Delmarva Power and Light Company [Member]
Revenue, Major Customer [Line Items]
Revenues	474	431
Revenue from Related Parties	2	1
Delmarva Power and Light Company [Member] \| Regulated Operation [Member]
Revenue, Major Customer [Line Items]
Revenues	464	432
Delmarva Power and Light Company [Member] \| Other Regulated Revenue [Member]
Revenue, Major Customer [Line Items]
Revenues	10	(1)
Atlantic City Electric Company [Member]
Revenue, Major Customer [Line Items]
Revenues	353	349
Revenue from Related Parties	1	1
Atlantic City Electric Company [Member] \| Regulated Operation [Member]
Revenue, Major Customer [Line Items]
Revenues	336	346
Atlantic City Electric Company [Member] \| Other Regulated Revenue [Member]
Revenue, Major Customer [Line Items]
Revenues	17	3
Rate-regulated electric revenues [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	4,462	4,481
Rate-regulated electric revenues [Member] \| Operating Segment [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	4,707	4,522
Rate-regulated electric revenues [Member] \| Commonwealth Edison Co [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	1,511	1,688
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	1,508	1,686
Revenue from Related Parties	3	6
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	6	8
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	836	857
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	361	423
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	84	153
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	10	14
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	217	239
Rate-regulated electric revenues [Member] \| PECO Energy Co [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	798	734
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	795	732
Revenue from Related Parties	1	1
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	3
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	519	487
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	135	111
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	65	64
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	8	8
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	62
Rate-regulated electric revenues [Member] \| Baltimore Gas and Electric Company [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	780	735
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	778	733
Revenue from Related Parties	2	2
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	4
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	434	417
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	92	81
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	149	131
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
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	96	97
Rate-regulated electric revenues [Member] \| Pepco Holdings LLC [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	1,371	1,323
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	1,370	1,325
Revenue from Related Parties	3	3
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	4	1
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	639	652
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	160	141
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	378	323
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	17	16
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	176	193
Rate-regulated electric revenues [Member] \| Potomac Electric Power Company [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	670	620
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	668	620
Revenue from Related Parties	1	1
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	3	1
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	283	275
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	39	38
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	282	253
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	8
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	56	46
Rate-regulated electric revenues [Member] \| Delmarva Power and Light Company [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	366	348
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	367	349
Revenue from Related Parties	2	2
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
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	210	207
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	62	56
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	33	26
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	4	4
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	58	56
Rate-regulated electric revenues [Member] \| Atlantic City Electric Company [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	335	345
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	336	346
Revenue from Related Parties	1	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
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	146	170
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	59	47
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	63	44
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	5	4
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	63	81
Rate-regulated natural gas revenues [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	822	817
Rate-regulated natural gas revenues [Member] \| Operating Segment [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	856	805
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
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
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
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
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
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
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
Rate-regulated natural gas revenues [Member] \| PECO Energy Co [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	316	306
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	316	305
Revenue from Related Parties	1	0
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	1	1
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	223	218
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	75	76
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	1	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	8	8
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	9	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	409	424
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	408	427
Revenue from Related Parties	1	6
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	2
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	278	282
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	41	45
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	70	65
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
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	19	35
Rate-regulated natural gas revenues [Member] \| Pepco Holdings LLC [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	97	83
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	97	83
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
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	60	51
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	26	21
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	1	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	4	4
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	4
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
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
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
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
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
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
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
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	97	83
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	97	83
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
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	60	51
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	26	21
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	1	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	4	4
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	4
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
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
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
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
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
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
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
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	153	40
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	(4)	6
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	65	(12)
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	65	(5)
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	39	(7)
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	9	(1)
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	$ 17	$ 3

Accounts Receivable - Allowance

Accounts Receivable - Allowance for Credit Losses Rollforward (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current period provision for expected credit losses	$ (70)	$ (78)
Commonwealth Edison Co [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current period provision for expected credit losses	0	(17)
PECO Energy Co [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current period provision for expected credit losses	(37)	(27)
Baltimore Gas and Electric Company [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current period provision for expected credit losses	(18)	(18)
Pepco Holdings LLC [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current period provision for expected credit losses	(15)	(18)
Potomac Electric Power Company [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current period provision for expected credit losses	(7)	(9)
Delmarva Power and Light Company [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current period provision for expected credit losses	(5)	(6)
Atlantic City Electric Company [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current period provision for expected credit losses	(3)	(3)
Customer accounts receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	327	320
Current period provision for expected credit losses	108	110
Writeoffs, net of recoveries	46	41
Ending balance	389	389
Customer accounts receivable \| Commonwealth Edison Co [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	59	73
Current period provision for expected credit losses	22	26
Writeoffs, net of recoveries	7	7
Ending balance	74	92
Customer accounts receivable \| PECO Energy Co [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	105	105
Current period provision for expected credit losses	39	31
Writeoffs, net of recoveries	14	11
Ending balance	130	125
Customer accounts receivable \| Baltimore Gas and Electric Company [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	54	38
Current period provision for expected credit losses	30	26
Writeoffs, net of recoveries	11	5
Ending balance	73	59
Customer accounts receivable \| Pepco Holdings LLC [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	109	104
Current period provision for expected credit losses	17	27
Writeoffs, net of recoveries	14	18
Ending balance	112	113
Customer accounts receivable \| Potomac Electric Power Company [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	47	37
Current period provision for expected credit losses	9	11
Writeoffs, net of recoveries	7	8
Ending balance	49	40
Customer accounts receivable \| Delmarva Power and Light Company [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	21	18
Current period provision for expected credit losses	7	7
Writeoffs, net of recoveries	2	1
Ending balance	26	24
Customer accounts receivable \| Atlantic City Electric Company [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	41	49
Current period provision for expected credit losses	1	9
Writeoffs, net of recoveries	5	9
Ending balance	37	49
Other receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	82	72
Current period provision for expected credit losses	14	14
Writeoffs, net of recoveries	5	5
Ending balance	91	81
Other receivables \| Commonwealth Edison Co [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	17	17
Current period provision for expected credit losses	2	4
Writeoffs, net of recoveries	1	1
Ending balance	18	20
Other receivables \| PECO Energy Co [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	9	7
Current period provision for expected credit losses	3	3
Writeoffs, net of recoveries	1	1
Ending balance	11	9
Other receivables \| Baltimore Gas and Electric Company [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	10	9
Current period provision for expected credit losses	4	3
Writeoffs, net of recoveries	2	1
Ending balance	12	11
Other receivables \| Pepco Holdings LLC [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	46	39
Current period provision for expected credit losses	5	4
Writeoffs, net of recoveries	1	2
Ending balance	50	41
Other receivables \| Potomac Electric Power Company [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	25	16
Current period provision for expected credit losses	3	2
Writeoffs, net of recoveries	0	0
Ending balance	28	18
Other receivables \| Delmarva Power and Light Company [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	7	8
Current period provision for expected credit losses	1	1
Writeoffs, net of recoveries	0	0
Ending balance	8	9
Other receivables \| Atlantic City Electric Company [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	14	15
Current period provision for expected credit losses	1	1
Writeoffs, net of recoveries	1	2
Ending balance	$ 14	$ 14

Accounts Receivable - Unbilled

Accounts Receivable - Unbilled Customer Revenue (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unbilled customer revenue	$ 709	$ 912
Commonwealth Edison Co [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unbilled customer revenue	237	223
PECO Energy Co [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unbilled customer revenue	149	219
Baltimore Gas and Electric Company [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unbilled customer revenue	149	247
Pepco Holdings LLC [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unbilled customer revenue	174	223
Potomac Electric Power Company [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unbilled customer revenue	74	103
Delmarva Power and Light Company [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unbilled customer revenue	49	74
Atlantic City Electric Company [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unbilled customer revenue	$ 51	$ 46

Accounts Receivable - Purchases

Accounts Receivable - Purchases and Sales of Accounts Receivable (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable, Purchase	$ 1,108	$ 1,044
Commonwealth Edison Co [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable, Purchase	240	248
PECO Energy Co [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable, Purchase	309	292
Baltimore Gas and Electric Company [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable, Purchase	245	222
Pepco Holdings LLC [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable, Purchase	314	282
Potomac Electric Power Company [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable, Purchase	210	174
Delmarva Power and Light Company [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable, Purchase	56	57
Atlantic City Electric Company [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable, Purchase	$ 48	51
Exelon Generation Co LLC Affiliate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable, Related Parties, Purchase		4
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

Income Taxes - Narrative (Detai

Income Taxes - Narrative (Details) - USD ($) $ in Millions		3 Months Ended
Income Taxes - Narrative (Details) - USD ($) $ in Millions	Aug. 16, 2022	Mar. 31, 2023
Income Tax Additional Narrative Information [Line Items]
Income Tax Credits and Adjustments		$ 15
Income Taxes Receivable, Current		18
Notes Payable, Current		212
Notes Payable, Noncurrent		319
US Treasury (UST) Interest Rate
Income Tax Additional Narrative Information [Line Items]
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent	15%
Atlantic City Electric Company [Member]
Income Tax Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Assets		(18)
PECO Energy Co [Member]
Income Tax Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Assets		44
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 Taxes - Reconciliation t

Income Taxes - Reconciliation to Effective Tax Rate (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Effective Income Tax Rate Reconciliation, Percent [Abstract]
U.S. Federal statutory rate	21%	21%
Increase (decrease) due to:
State income taxes, net of Federal income tax benefit	6%	21.10%
Plant basis differences	(4.00%)	(3.60%)
Excess deferred tax amortization	(6.30%)	(11.50%)
Amortization of investment tax credit, including deferred taxes on basis difference	(0.10%)	(0.10%)
Effective Income Tax Rate Reconciliation, Tax Credit, Other, Percent	(0.50%)	1.70%
Other	0.60%	2.60%
Effective income tax rate	16.70%	31.20%
Income Tax Credits and Adjustments	$ 15
Total transaction costs relating to the Separation	19
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
Commonwealth Edison Co [Member]
Effective Income Tax Rate Reconciliation, Percent [Abstract]
U.S. Federal statutory rate	21%	21%
Increase (decrease) due to:
State income taxes, net of Federal income tax benefit	7.90%	8%
Plant basis differences	(0.30%)	(0.60%)
Excess deferred tax amortization	(5.70%)	(6.30%)
Amortization of investment tax credit, including deferred taxes on basis difference	(0.10%)	(0.10%)
Effective Income Tax Rate Reconciliation, Tax Credit, Other, Percent	(0.30%)	(0.30%)
Other	0.30%	0%
Effective income tax rate	22.80%	21.70%
PECO Energy Co [Member]
Effective Income Tax Rate Reconciliation, Percent [Abstract]
U.S. Federal statutory rate	21%	21%
Increase (decrease) due to:
State income taxes, net of Federal income tax benefit	(1.40%)	(0.10%)
Plant basis differences	(15.20%)	(11.30%)
Excess deferred tax amortization	(2.40%)	(3.20%)
Amortization of investment tax credit, including deferred taxes on basis difference	0%	0%
Effective Income Tax Rate Reconciliation, Tax Credit, Other, Percent	0%	0%
Other	0.40%	0%
Effective income tax rate	2.40%	6.40%
Baltimore Gas and Electric Company [Member]
Effective Income Tax Rate Reconciliation, Percent [Abstract]
U.S. Federal statutory rate	21%	21%
Increase (decrease) due to:
State income taxes, net of Federal income tax benefit	6.40%	2.40%
Plant basis differences	(0.70%)	(0.90%)
Excess deferred tax amortization	(5.40%)	(17.60%)
Amortization of investment tax credit, including deferred taxes on basis difference	(0.10%)	(0.10%)
Effective Income Tax Rate Reconciliation, Tax Credit, Other, Percent	(0.50%)	(0.40%)
Other	(0.10%)	(0.10%)
Effective income tax rate	20.60%	4.30%
Pepco Holdings LLC [Member]
Effective Income Tax Rate Reconciliation, Percent [Abstract]
U.S. Federal statutory rate	21%	21%
Increase (decrease) due to:
State income taxes, net of Federal income tax benefit	6%	3.70%
Plant basis differences	(1.80%)	(1.60%)
Excess deferred tax amortization	(7.00%)	(17.70%)
Amortization of investment tax credit, including deferred taxes on basis difference	(0.10%)	(0.10%)
Effective Income Tax Rate Reconciliation, Tax Credit, Other, Percent	(0.40%)	(0.40%)
Other	0.30%	0.20%
Effective income tax rate	18%	5.10%
Potomac Electric Power Company [Member]
Effective Income Tax Rate Reconciliation, Percent [Abstract]
U.S. Federal statutory rate	21%	21%
Increase (decrease) due to:
State income taxes, net of Federal income tax benefit	5.40%	(4.50%)
Plant basis differences	(2.50%)	(2.60%)
Excess deferred tax amortization	(8.40%)	(17.40%)
Amortization of investment tax credit, including deferred taxes on basis difference	0%	0%
Effective Income Tax Rate Reconciliation, Tax Credit, Other, Percent	(0.40%)	(0.40%)
Other	0.50%	(0.60%)
Effective income tax rate	15.60%	(4.50%)
Delmarva Power and Light Company [Member]
Effective Income Tax Rate Reconciliation, Percent [Abstract]
U.S. Federal statutory rate	21%	21%
Increase (decrease) due to:
State income taxes, net of Federal income tax benefit	6.30%	6.20%
Plant basis differences	(1.00%)	(0.70%)
Excess deferred tax amortization	(8.80%)	(19.40%)
Amortization of investment tax credit, including deferred taxes on basis difference	(0.10%)	(0.20%)
Effective Income Tax Rate Reconciliation, Tax Credit, Other, Percent	(0.40%)	(0.30%)
Other	(0.30%)	0.10%
Effective income tax rate	16.70%	6.70%
Atlantic City Electric Company [Member]
Effective Income Tax Rate Reconciliation, Percent [Abstract]
U.S. Federal statutory rate	21%	21%
Increase (decrease) due to:
State income taxes, net of Federal income tax benefit	6.90%	6.80%
Plant basis differences	(0.90%)	(1.30%)
Excess deferred tax amortization	(2.00%)	(22.20%)
Amortization of investment tax credit, including deferred taxes on basis difference	(0.10%)	(0.20%)
Effective Income Tax Rate Reconciliation, Tax Credit, Other, Percent	(0.30%)	(0.30%)
Other	0.40%	(0.10%)
Effective income tax rate	25%	3.70%

Income Taxes - Unrecognized Tax

Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Income Tax Contingency [Line Items]
Unrecognized Tax Benefits	$ 148	$ 148
Income Taxes Receivable, Noncurrent	50
Pepco Holdings LLC [Member]
Income Tax Contingency [Line Items]
Unrecognized Tax Benefits	59	59
Atlantic City Electric Company [Member]
Income Tax Contingency [Line Items]
Unrecognized Tax Benefits	$ 17	$ 17

Retirement Benefits - Narrative

Retirement Benefits - Narrative (Details) $ in Millions	3 Months Ended
Retirement Benefits - Narrative (Details) $ in Millions	Mar. 31, 2023 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Increase (Decrease) in Obligation, Pension Benefits	$ (27)
Increase (Decrease) in Obligation, Other Postretirement Benefits	2
Accumulated Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), after Tax	10
Defined Benefit Plan Amounts Recognized In Regulatory Assets Before Tax	18
Defined Benefit Plan Amounts Recognized In Regulatory Liabilities Before Tax	$ 1
Pension Plan, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected return on assets	7,000,000%
Discount rate	5,530,000%
Other Postretirement Benefit Plan, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected return on assets	6,500,000%
Discount rate	5,510,000%

Retirement Benefits - Calculati

Retirement Benefits - Calculation of Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Amortization of:
Non-service net periodic benefit cost	$ (1)	$ 17
Pension Plan, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	39	61
Interest cost	145	110
Expected return on assets	(189)	(209)
Amortization of:
Prior service cost (credit)	1	1
Actuarial loss	41	76
Non-service net periodic benefit cost	37	39
Other Postretirement Benefit Plan, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	6	10
Interest cost	25	19
Expected return on assets	(21)	(25)
Amortization of:
Prior service cost (credit)	(2)	(5)
Actuarial loss	0	4
Non-service net periodic benefit cost	$ 8	$ 3

Retirement Benefits - Allocated

Retirement Benefits - Allocated Portion of Pension and Postretirement Benefit Plan Costs (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Pension and Other Postretirement Benefits Costs	$ 45	$ 44
Pension and other post retirement benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension and Other Postretirement Benefits Costs	45	42
Commonwealth Edison Co [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension and Other Postretirement Benefits Costs	6	16
Commonwealth Edison Co [Member] \| Pension and other post retirement benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension and Other Postretirement Benefits Costs	6	16
PECO Energy Co [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension and Other Postretirement Benefits Costs	(3)	(2)
PECO Energy Co [Member] \| Pension and other post retirement benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension and Other Postretirement Benefits Costs	(3)	(2)
Baltimore Gas and Electric Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension and Other Postretirement Benefits Costs	14	12
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	14	11
Pepco Holdings LLC [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension and Other Postretirement Benefits Costs	24	13
Pepco Holdings LLC [Member] \| Pension and other post retirement benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension and Other Postretirement Benefits Costs	24	13
Potomac Electric Power Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension and Other Postretirement Benefits Costs	8	2
Potomac Electric Power Company [Member] \| Pension and other post retirement benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension and Other Postretirement Benefits Costs	8	2
Delmarva Power and Light Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension and Other Postretirement Benefits Costs	4	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	4	1
Atlantic City Electric Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension and Other Postretirement Benefits Costs	4	3
Atlantic City Electric Company [Member] \| Pension and other post retirement benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension and Other Postretirement Benefits Costs	$ 4	$ 3

Retirement Benefits - Defined C

Retirement Benefits - Defined Contribution Savings Plans (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Savings Plan Employer Contributions	$ 21	$ 20
Commonwealth Edison Co [Member]
Defined Benefit Plan Disclosure [Line Items]
Savings Plan Employer Contributions	9	8
PECO Energy Co [Member]
Defined Benefit Plan Disclosure [Line Items]
Savings Plan Employer Contributions	3	3
Baltimore Gas and Electric Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Savings Plan Employer Contributions	2	2
Pepco Holdings LLC [Member]
Defined Benefit Plan Disclosure [Line Items]
Savings Plan Employer Contributions	3	3
Potomac Electric Power Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Savings Plan Employer Contributions	1	1
Delmarva Power and Light Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Savings Plan Employer Contributions	1	1
Atlantic City Electric Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Savings Plan Employer Contributions	$ 0	$ 0

Derivative Financial Instrume_2

Derivative Financial Instruments - Narrative (Details) MWh in Millions, $ in Millions	1 Months Ended	3 Months Ended
	Jun. 30, 2012 MWh	Mar. 31, 2023 USD ($)	Jan. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Derivative [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax		$ (639)		$ (638)
Corporate, Non-Segment [Member] \| Notes Payable to Banks [Member]
Derivative [Line Items]
Debt Instrument, Face Amount		2,500
Corporate, Non-Segment [Member] \| Notes515Mar2028 \| Notes Payable to Banks [Member]
Derivative [Line Items]
Debt Instrument, Face Amount		1,000
Commonwealth Edison Co [Member]
Derivative [Line Items]
Long-term Purchase Commitment, Minimum Energy Volume Required \| MWh	1.3
PECO Energy Co [Member]
Derivative [Line Items]
Incremental Collateral For Loss Of Investment Grade Credit Rating		$ 39
Estimated Percent of Gas Purchases Being Hedged		10%
Baltimore Gas and Electric Company [Member]
Derivative [Line Items]
Incremental Collateral For Loss Of Investment Grade Credit Rating		$ 73
Baltimore Gas and Electric Company [Member] \| Maximum [Member]
Derivative [Line Items]
Estimated Percent of Gas Purchases Being Hedged		20%
Baltimore Gas and Electric Company [Member] \| Minimum [Member]
Derivative [Line Items]
Estimated Percent of Gas Purchases Being Hedged		10%
Delmarva Power and Light Company [Member]
Derivative [Line Items]
Incremental Collateral For Loss Of Investment Grade Credit Rating		$ 14
Estimated Percent of Gas Purchases Being Hedged		50%
Interest Rate Swap [Member] \| Cash Flow Hedging
Derivative [Line Items]
Derivative, Notional Amount		$ 130	$ 230	1,270
Derivative, Cash Received on Hedge		10
Interest Rate Cap \| Not Designated as Hedging Instrument, Economic Hedge [Member]
Derivative [Line Items]
Derivative, Notional Amount		1,000		1,850
InterestRateSwapNotional5YR \| Cash Flow Hedging
Derivative [Line Items]
Derivative, Notional Amount		65	115
InterestRateSwapNotional10YR \| Cash Flow Hedging
Derivative [Line Items]
Derivative, Notional Amount		65	115
Constant Maturity Treasury Interest Rate Swaps \| Not Designated as Hedging Instrument, Economic Hedge [Member]
Derivative [Line Items]
Derivative, Notional Amount		$ 4,100	3,600	500
InterestRateSwapNotionalTerminated \| Cash Flow Hedging
Derivative [Line Items]
Derivative, Notional Amount			1,500
Accumulated Other Comprehensive Income (Loss), Net of Tax			$ 7
InterestRateCap18month \| Not Designated as Hedging Instrument, Economic Hedge [Member]
Derivative [Line Items]
Derivative, Notional Amount				1,000
InterestRateCapNotional6month \| Not Designated as Hedging Instrument, Economic Hedge [Member]
Derivative [Line Items]
Derivative, Notional Amount				$ 850

Derivative Financial Instrume_3

Derivative Financial Instruments - Summary of Interest Rate Hedge Balances (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Mark-to-market derivative liabilities (current liabilities)	$ 23	$ 8
Derivative Liability, Noncurrent	77	83
Interest Rate Contract
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Asset, Noncurrent	3	11
Derivative Asset	3	11
Mark-to-market derivative liabilities (current liabilities)	(1)	(3)
Derivative Liability, Noncurrent	(1)	(4)
Derivative Liability	(2)	(7)
Derivative, Fair Value, Net	1	4
Interest Rate Contract \| Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Asset, Noncurrent	0	6
Derivative Asset	0	6
Mark-to-market derivative liabilities (current liabilities)	0	0
Derivative Liability, Noncurrent	(1)	(4)
Derivative Liability	(1)	(4)
Derivative, Fair Value, Net	(1)	2
Interest Rate Contract \| Not Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Asset, Noncurrent	3	5
Derivative Asset	3	5
Mark-to-market derivative liabilities (current liabilities)	(1)	(3)
Derivative Liability, Noncurrent	0	0
Derivative Liability	(1)	(3)
Derivative, Fair Value, Net	$ 2	$ 2

Derivative Financial Instrume_4

Derivative Financial Instruments - Summary of Economic Hedges (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Unrealized Gain (Loss) on Derivatives	$ 0	$ 59
Interest Rate Cap \| Not Designated as Hedging Instrument, Economic Hedge [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Unrealized Gain (Loss) on Derivatives	0
Interest Rate Cap \| Not Designated as Hedging Instrument, Economic Hedge [Member] \| Electric Operating Revenues
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Unrealized Gain (Loss) on Derivatives	1
Interest Rate Cap \| Not Designated as Hedging Instrument, Economic Hedge [Member] \| Interest Expense
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Unrealized Gain (Loss) on Derivatives	$ (1)

Derivative Financial Instrume_5

Derivative Financial Instruments - Summary of Counterparty Collateral (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Other	$ 976	$ 1,155
Commonwealth Edison Co [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Other	189	191
Baltimore Gas and Electric Company [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Other	34	55
Pepco Holdings LLC [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Other	149	330
Potomac Electric Power Company [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Other	75	93
Delmarva Power and Light Company [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Other	17	136
Atlantic City Electric Company [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Other	12	58
External Counterparties \| Commodity Contract [Member] \| Collateral [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Other	81	297
External Counterparties \| Commodity Contract [Member] \| Collateral [Member] \| Commonwealth Edison Co [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Other	73	77
External Counterparties \| Commodity Contract [Member] \| Collateral [Member] \| Baltimore Gas and Electric Company [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Other	1	23
External Counterparties \| Commodity Contract [Member] \| Collateral [Member] \| Pepco Holdings LLC [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Other	8	197
External Counterparties \| Commodity Contract [Member] \| Collateral [Member] \| Potomac Electric Power Company [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Other	1	26
External Counterparties \| Commodity Contract [Member] \| Collateral [Member] \| Delmarva Power and Light Company [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Other	1	121
External Counterparties \| Commodity Contract [Member] \| Collateral [Member] \| Atlantic City Electric Company [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Other	$ 6	$ 50

Debt and Credit Agreements - Na

Debt and Credit Agreements - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Jan. 10, 2023	Oct. 07, 2022
Corporate, Non-Segment [Member] \| ShortTermDebt03232017
Short-term Debt [Line Items]
Short-term Bank Loans and Notes Payable	$ 500
Corporate, Non-Segment [Member] \| ShortTermDebt03232017 \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Short-term Debt [Line Items]
Debt Instrument, Interest Rate Terms	SOFR plus 0.90
Corporate, Non-Segment [Member] \| ShortTermDebt03142023
Short-term Debt [Line Items]
Short-term Bank Loans and Notes Payable	$ 300
Corporate, Non-Segment [Member] \| ShortTermDebt03242023
Short-term Debt [Line Items]
Short-term Bank Loans and Notes Payable	200
Commonwealth Edison Co [Member] \| ShortTermDebtSOFRplus075Oct2023
Short-term Debt [Line Items]
Short-term Bank Loans and Notes Payable	$ 150
Commonwealth Edison Co [Member] \| ShortTermDebtSOFRplus075Oct2023 \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Short-term Debt [Line Items]
Debt Instrument, Interest Rate Terms	SOFR plus 0.75
Commonwealth Edison Co [Member] \| FMB490Feb2033 \| First Mortgage [Member]
Short-term Debt [Line Items]
Debt Instrument, Face Amount		$ 400
Commonwealth Edison Co [Member] \| FMB530Feb2053 \| First Mortgage [Member]
Short-term Debt [Line Items]
Debt Instrument, Face Amount		$ 575
Revolving Credit Facility [Member] \| Corporate, Non-Segment [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Maximum Amount Outstanding During Period	$ 0
Line of Credit Facility, Maximum Borrowing Capacity	900
Revolving Credit Facility [Member] \| Commonwealth Edison Co [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Maximum Amount Outstanding During Period	0
Line of Credit Facility, Maximum Borrowing Capacity	1,000
Revolving Credit Facility [Member] \| PECO Energy Co [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Maximum Amount Outstanding During Period	0
Line of Credit Facility, Maximum Borrowing Capacity	600
Revolving Credit Facility [Member] \| Baltimore Gas and Electric Company [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Maximum Amount Outstanding During Period	0
Line of Credit Facility, Maximum Borrowing Capacity	600
Revolving Credit Facility [Member] \| Potomac Electric Power Company [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Maximum Amount Outstanding During Period	0
Line of Credit Facility, Maximum Borrowing Capacity	300
Revolving Credit Facility [Member] \| Delmarva Power and Light Company [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Maximum Amount Outstanding During Period	0
Line of Credit Facility, Maximum Borrowing Capacity	300
Revolving Credit Facility [Member] \| Atlantic City Electric Company [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Maximum Amount Outstanding During Period	0
Line of Credit Facility, Maximum Borrowing Capacity	$ 300
Letter of Credit \| Commonwealth Edison Co [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity			$ 40
Letter of Credit \| PECO Energy Co [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity			40
Letter of Credit \| Baltimore Gas and Electric Company [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity			15
Letter of Credit \| Potomac Electric Power Company [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity			15
Letter of Credit \| Delmarva Power and Light Company [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity			15
Letter of Credit \| Atlantic City Electric Company [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity			$ 15

Debt and Credit Agreements - Co

Debt and Credit Agreements - Commercial Paper Borrowings (Details) - Commercial Paper [Member] - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Short-term Debt [Line Items]
Commercial Paper	$ 807	$ 1,938
Short-term Debt, Weighted Average Interest Rate, at Point in Time	5.12%	4.77%
Corporate [Member]
Short-term Debt [Line Items]
Commercial Paper	$ 10	$ 449
Commonwealth Edison Co [Member]
Short-term Debt [Line Items]
Commercial Paper	$ 409	$ 427
Short-term Debt, Weighted Average Interest Rate, at Point in Time	5.09%	4.71%
PECO Energy Co [Member]
Short-term Debt [Line Items]
Commercial Paper	$ 145	$ 239
Short-term Debt, Weighted Average Interest Rate, at Point in Time	5.04%	4.71%
Baltimore Gas and Electric Company [Member]
Short-term Debt [Line Items]
Commercial Paper	$ 243	$ 409
Short-term Debt, Weighted Average Interest Rate, at Point in Time	5.24%	4.81%
Pepco Holdings LLC [Member]
Short-term Debt [Line Items]
Commercial Paper	$ 0	$ 414
Short-term Debt, Weighted Average Interest Rate, at Point in Time	0%	4.78%
Potomac Electric Power Company [Member]
Short-term Debt [Line Items]
Commercial Paper	$ 0	$ 299
Short-term Debt, Weighted Average Interest Rate, at Point in Time	0%	4.79%
Delmarva Power and Light Company [Member]
Short-term Debt [Line Items]
Commercial Paper	$ 0	$ 115
Short-term Debt, Weighted Average Interest Rate, at Point in Time	0%	4.76%
Atlantic City Electric Company [Member]
Short-term Debt [Line Items]
Commercial Paper	$ 0

Debt and Credit Agreements - Su

Debt and Credit Agreements - Summary of Revolving Credit Agreements (Details) - Revolving Credit Facility [Member] $ in Millions	Mar. 31, 2023 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	Mar. 31, 2023 USD ($)
Corporate [Member] \| Notes Payable to Banks [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 2,500
Corporate [Member] \| Notes515Mar2028 \| Notes Payable to Banks [Member]
Debt Instrument [Line Items]
Interest Rate	5.15%
Debt Instrument, Face Amount	$ 1,000
Corporate [Member] \| Notes530Mar2033 \| Notes Payable to Banks [Member]
Debt Instrument [Line Items]
Interest Rate	5.30%
Debt Instrument, Face Amount	$ 850
Corporate [Member] \| Note560Mar2053 \| Notes Payable to Banks [Member]
Debt Instrument [Line Items]
Interest Rate	5.60%
Debt Instrument, Face Amount	$ 650
Commonwealth Edison Co [Member] \| ComEdFMB490Feb2033 \| First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Interest Rate	4.90%
Debt Instrument, Face Amount	$ 400
Commonwealth Edison Co [Member] \| FMB530Feb2053 \| First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Interest Rate	5.30%
Debt Instrument, Face Amount	$ 575
Potomac Electric Power Company [Member] \| PepcoFMB5.30Mar2033 \| First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Interest Rate	5.30%
Debt Instrument, Face Amount	$ 85
Potomac Electric Power Company [Member] \| FMB540Feb2038 \| First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Interest Rate	5.40%
Debt Instrument, Face Amount	$ 40
Potomac Electric Power Company [Member] \| PepcoFMB557Mar2053 \| First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Interest Rate	5.57%
Debt Instrument, Face Amount	$ 125
Potomac Electric Power Company [Member] \| FMB535Sept2033 \| First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Interest Rate	5.35%
Debt Instrument, Face Amount	$ 100
Delmarva Power and Light Company [Member] \| DPLFMB530Mar2033 \| First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Interest Rate	5.30%
Debt Instrument, Face Amount	$ 60
Delmarva Power and Light Company [Member] \| DPLFMB557Mar2053 \| First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Interest Rate	5.57%
Debt Instrument, Face Amount	$ 65
Delmarva Power and Light Company [Member] \| DPLFMB545Nov2033 \| First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Interest Rate	5.45%
Debt Instrument, Face Amount	$ 340
Delmarva Power and Light Company [Member] \| DPLFMB555Nov2038 \| First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Interest Rate	5.55%
Debt Instrument, Face Amount	$ 75
Delmarva Power and Light Company [Member] \| DPLFMB572Nov2053 \| First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Interest Rate	5.72%
Debt Instrument, Face Amount	$ 110
Atlantic City Electric Company [Member] \| ACEFMB557Mar2053 \| First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Interest Rate	5.57%
Debt Instrument, Face Amount	$ 75

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	Mar. 31, 2023	Dec. 31, 2022
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)	40,088	37,074
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)	36,094	32,229
Long-term debt to financing trust	392	384
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
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)	33,224	29,902
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)	2,870	2,327
Long-term debt to financing trust	392	384
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)	11,480	10,518
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)	10,236	9,006
Long-term debt to financing trust	207	204
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)	10,236	9,006
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	207	204
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)	4,613	4,612
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)	3,996	3,914
Long-term debt to financing trust	185	180
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)	3,946	3,864
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	185	180
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)	4,208	4,207
Baltimore Gas and Electric Company [Member] \| Estimate of Fair Value Measurement [Member]
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Long-term debt (including amounts due within one year)	3,685	3,613
Baltimore Gas and Electric Company [Member] \| Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 1 [Member]
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Long-term debt (including amounts due within one year)	0	0
Baltimore Gas and Electric Company [Member] \| Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 2 [Member]
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Long-term debt (including amounts due within one year)	3,685	3,613
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)	8,553	8,120
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)	7,452	6,784
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)	4,632	4,507
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)	2,820	2,277
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)	3,995	3,751
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)	3,802	3,434
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)	2,295	2,229
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)	1,507	1,205
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)	2,061	1,938
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)	1,787	1,622
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)	1,183	1,164
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)	604	458
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)	1,831	1,757
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)	1,644	1,523
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)	935	909
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)	$ 709	$ 614

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	Mar. 31, 2023	Dec. 31, 2022
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Mark-to-market derivative liabilities (current liabilities)	$ 23	$ 8
Derivative Liability, Noncurrent	77	83
Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash equivalents	523	664
Assets, Fair Value Disclosure	744	891
Deferred Compensation Liability, Current and Noncurrent	(75)	(75)
Total Liabilities	(175)	(166)
Fair Value, Net Asset (Liability)	569	725
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	(1)	(3)
Fair Value, Recurring [Member] \| Derivatives Designated as Hedging Instruments Liabilities
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Total mark-to-market derivative liabilities	(1)	(4)
Fair Value, Recurring [Member] \| Interest Rate Derivative Liabilities
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Total mark-to-market derivative liabilities	(2)	(7)
Fair Value, Recurring [Member] \| Mark-to-Market Derivative Liabilities
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Total mark-to-market derivative liabilities	(98)	(84)
Fair Value, Recurring [Member] \| Cash and Cash Equivalents [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash equivalents	482	345
Fair Value, Recurring [Member] \| Restricted cash member [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash equivalents	78	81
Fair Value, Recurring [Member] \| Other Assets [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash equivalents	180	117
Fair Value, Recurring [Member] \| Rabbi Trust Investments [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	218	216
Fair Value, Recurring [Member] \| Cash Equivalents [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	65	62
Fair Value, Recurring [Member] \| Mutual Funds [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	49	49
Fair Value, Recurring [Member] \| Fixed Income Investments [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	7	7
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] \| Designated as Hedging Instrument [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Derivative Asset	0	6
Fair Value, Recurring [Member] \| Economic Hedges
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Derivative Asset	3	5
Fair Value, Recurring [Member] \| Interest Rate Derivative Assets
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Derivative Asset	3	11
Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash equivalents	523	664
Assets, Fair Value Disclosure	637	775
Deferred Compensation Liability, Current and Noncurrent	0	0
Total Liabilities	0	0
Fair Value, Net Asset (Liability)	637	775
Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member] \| Economic Hedging Instrument Liabilites [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Total mark-to-market derivative liabilities	0	0
Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member] \| Derivatives Designated as Hedging Instruments Liabilities
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Total mark-to-market derivative liabilities	0	0
Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member] \| Interest Rate Derivative Liabilities
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Total mark-to-market derivative liabilities	0	0
Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member] \| Mark-to-Market Derivative Liabilities
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	114	111
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	65	62
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	49	49
Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member] \| Fixed Income Investments [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member] \| 6311 Life Insurance [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member] \| Designated as Hedging Instrument [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Derivative Asset	0	0
Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member] \| Economic Hedges
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Derivative Asset	0	0
Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member] \| Interest Rate Derivative Assets
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Derivative Asset	0	0
Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash equivalents	0	0
Assets, Fair Value Disclosure	66	76
Deferred Compensation Liability, Current and Noncurrent	(75)	(75)
Total Liabilities	(77)	(82)
Fair Value, Net Asset (Liability)	(11)	(6)
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	(1)	(3)
Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member] \| Derivatives Designated as Hedging Instruments Liabilities
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Total mark-to-market derivative liabilities	(1)	(4)
Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member] \| Interest Rate Derivative Liabilities
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Total mark-to-market derivative liabilities	(2)	(7)
Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member] \| Mark-to-Market Derivative Liabilities
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	63	65
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	7	7
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	56	58
Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member] \| Designated as Hedging Instrument [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Derivative Asset	0	6
Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member] \| Economic Hedges
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Derivative Asset	3	5
Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member] \| Interest Rate Derivative Assets
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Derivative Asset	3	11
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	41	40
Deferred Compensation Liability, Current and Noncurrent	0	0
Total Liabilities	(98)	(84)
Fair Value, Net Asset (Liability)	(57)	(44)
Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member] \| Economic Hedging Instrument Liabilites [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Total mark-to-market derivative liabilities	0	0
Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member] \| Derivatives Designated as Hedging Instruments Liabilities
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Total mark-to-market derivative liabilities	0	0
Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member] \| Interest Rate Derivative Liabilities
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Total mark-to-market derivative liabilities	0	0
Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member] \| Mark-to-Market Derivative Liabilities
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Total mark-to-market derivative liabilities	(98)	(84)
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	41	40
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	41	40
Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member] \| Designated as Hedging Instrument [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Derivative Asset	0	0
Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member] \| Economic Hedges
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Derivative Asset	0	0
Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member] \| Interest Rate Derivative Assets
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Derivative Asset	0	0
Fair Value Measured at Net Asset Value Per Share [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Assets, Fair Value Disclosure	0	0
Total Liabilities	0	0
Commonwealth Edison Co [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Mark-to-market derivative liabilities (current liabilities)	22	5
Derivative Liability, Noncurrent	76	79
Commonwealth Edison Co [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash equivalents	454	392
Assets, Fair Value Disclosure	454	392
Total mark-to-market derivative liabilities	(98)	(84)
Deferred Compensation Liability, Current and Noncurrent	(8)	(8)
Total Liabilities	(106)	(92)
Fair Value, Net Asset (Liability)	348	300
Mark-to-market derivative liabilities (current liabilities)	(22)	5
Derivative Liability, Noncurrent	(76)	79
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	51	42
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	73	77
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	180	117
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	454	392
Assets, Fair Value Disclosure	454	392
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)	454	392
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
Assets, Fair Value Disclosure	0	0
Total mark-to-market derivative liabilities	0	0
Deferred Compensation Liability, Current and Noncurrent	(8)	(8)
Total Liabilities	(8)	(8)
Fair Value, Net Asset (Liability)	(8)	(8)
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
Assets, Fair Value Disclosure	0	0
Total mark-to-market derivative liabilities	(98)	(84)
Deferred Compensation Liability, Current and Noncurrent	0	0
Total Liabilities	(98)	(84)
Fair Value, Net Asset (Liability)	(98)	(84)
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
Commonwealth Edison Co [Member] \| Fair Value Measured at Net Asset Value Per Share [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Assets, Fair Value Disclosure	0	0
Total Liabilities	0	0
PECO Energy Co [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash equivalents	11	10
Assets, Fair Value Disclosure	34	32
Total mark-to-market derivative liabilities	0	0
Deferred Compensation Liability, Current and Noncurrent	(8)	(7)
Total Liabilities	(8)	(7)
Fair Value, Net Asset (Liability)	26	25
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	25	58
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	23	22
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	8	7
PECO Energy Co [Member] \| Fair Value, Recurring [Member] \| 6311 Life Insurance [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	15	15
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	10
Assets, Fair Value Disclosure	19	17
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)	19	17
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	8	7
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	8	7
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
Assets, Fair Value Disclosure	15	15
Total mark-to-market derivative liabilities	0	0
Deferred Compensation Liability, Current and Noncurrent	(8)	(7)
Total Liabilities	(8)	(7)
Fair Value, Net Asset (Liability)	7	8
PECO Energy Co [Member] \| Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member] \| Rabbi Trust Investments [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	15	15
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	15	15
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
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
PECO Energy Co [Member] \| Fair Value Measured at Net Asset Value Per Share [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Assets, Fair Value Disclosure	0	0
Total Liabilities	0	0
Baltimore Gas and Electric Company [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash equivalents	1	23
Assets, Fair Value Disclosure	10	30
Total mark-to-market derivative liabilities	0	0
Deferred Compensation Liability, Current and Noncurrent	(4)	(4)
Total Liabilities	(4)	(4)
Fair Value, Net Asset (Liability)	6	26
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	19	43
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	1	1
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	9	7
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	9	7
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	1	23
Assets, Fair Value Disclosure	10	30
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)	10	30
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	9	7
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	9	7
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
Assets, Fair Value Disclosure	0	0
Total mark-to-market derivative liabilities	0	0
Deferred Compensation Liability, Current and Noncurrent	(4)	(4)
Total Liabilities	(4)	(4)
Fair Value, Net Asset (Liability)	(4)	(4)
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
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
Baltimore Gas and Electric Company [Member] \| Fair Value Measured at Net Asset Value Per Share [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Assets, Fair Value Disclosure	0	0
Total Liabilities	0	0
Pepco Holdings LLC [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash equivalents	35	205
Assets, Fair Value Disclosure	173	343
Deferred Compensation Liability, Current and Noncurrent	(13)	(14)
Total Liabilities	(13)	(14)
Fair Value, Net Asset (Liability)	160	329
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	358	165
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	3	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	138
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	62	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	10	11
Pepco Holdings LLC [Member] \| Fair Value, Recurring [Member] \| Fixed Income Investments [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	7	7
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	61
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	35	205
Assets, Fair Value Disclosure	107	275
Deferred Compensation Liability, Current and Noncurrent	0	0
Total Liabilities	0	0
Fair Value, Net Asset (Liability)	107	275
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	72	70
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	62	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	10	11
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	27	29
Deferred Compensation Liability, Current and Noncurrent	(13)	(14)
Total Liabilities	(13)	(14)
Fair Value, Net Asset (Liability)	14	15
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	27	29
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	7	7
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	20	22
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	39	39
Deferred Compensation Liability, Current and Noncurrent	0	0
Total Liabilities	0	0
Fair Value, Net Asset (Liability)	39	39
Pepco Holdings LLC [Member] \| Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member] \| Rabbi Trust Investments [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	39	39
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	39	39
Pepco Holdings LLC [Member] \| Fair Value Measured at Net Asset Value Per Share [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Assets, Fair Value Disclosure	0	0
Total Liabilities	0	0
Potomac Electric Power Company [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash equivalents	26	51
Assets, Fair Value Disclosure	146	170
Deferred Compensation Liability, Current and Noncurrent	(1)	(1)
Total Liabilities	(1)	(1)
Fair Value, Net Asset (Liability)	145	169
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	124	45
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	3	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	120	119
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	61	59
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	60
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	26	51
Assets, Fair Value Disclosure	87	110
Deferred Compensation Liability, Current and Noncurrent	0	0
Total Liabilities	0	0
Fair Value, Net Asset (Liability)	87	110
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	61	59
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	61	59
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	20	22
Deferred Compensation Liability, Current and Noncurrent	(1)	(1)
Total Liabilities	(1)	(1)
Fair Value, Net Asset (Liability)	19	21
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	20	22
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	20	22
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	39	38
Deferred Compensation Liability, Current and Noncurrent	0	0
Total Liabilities	0	0
Fair Value, Net Asset (Liability)	39	38
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	39	38
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	39	38
Potomac Electric Power Company [Member] \| Fair Value Measured at Net Asset Value Per Share [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Assets, Fair Value Disclosure	0	0
Total Liabilities	0	0
Delmarva Power and Light Company [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash equivalents	1	121
Assets, Fair Value Disclosure	1	121
Deferred Compensation Liability, Current and Noncurrent	0	0
Total Liabilities	0	0
Fair Value, Net Asset (Liability)	1	121
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	142	31
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	1	121
Assets, Fair Value Disclosure	1	121
Deferred Compensation Liability, Current and Noncurrent	0	0
Total Liabilities	0	0
Fair Value, Net Asset (Liability)	1	121
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
Delmarva Power and Light Company [Member] \| Fair Value Measured at Net Asset Value Per Share [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Assets, Fair Value Disclosure	0	0
Total Liabilities	0	0
Atlantic City Electric Company [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash equivalents	1	1
Assets, Fair Value Disclosure	1	1
Deferred Compensation Liability, Current and Noncurrent	0	0
Total Liabilities	0	0
Fair Value, Net Asset (Liability)	1	1
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	70	71
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	1	1
Assets, Fair Value Disclosure	1	1
Deferred Compensation Liability, Current and Noncurrent	0	0
Total Liabilities	0	0
Fair Value, Net Asset (Liability)	1	1
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
Atlantic City Electric Company [Member] \| Fair Value Measured at Net Asset Value Per Share [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Assets, Fair Value Disclosure	0	0
Total Liabilities	$ 0	$ 0

Fair Value of Financial Asset_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
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Footnotes To Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Abstract]
Derivative Liability, Noncurrent	$ 77		$ 83
Mark-to-market derivative liabilities (current liabilities)	23		8
Fair Value, Inputs, Level 3 [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning Balance	(44)	$ (182)
Total realized / unrealized gains (losses)
Included in net income(a)	1	1
Included in regulatory assets	(14)	75
Purchases, sales, issuances and settlements
Transfers out of Level 3		(1)
Ending Balance	(57)	(107)
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss)	1	1
Commonwealth Edison Co [Member]
Footnotes To Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Abstract]
Derivative Liability, Noncurrent	76		79
Mark-to-market derivative liabilities (current liabilities)	22		5
Commonwealth Edison Co [Member] \| Fair Value, Recurring [Member]
Footnotes To Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Abstract]
Derivative Liability, Noncurrent	(76)		79
Mark-to-market derivative liabilities (current liabilities)	(22)		$ 5
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)	11	6
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	(84)	(219)
Total realized / unrealized gains (losses)
Included in net income(a)	0	0
Included in regulatory assets	(14)	75
Purchases, sales, issuances and settlements
Transfers out of Level 3		0
Ending Balance	(98)	(144)
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss)	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)	25	(69)
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	40	35
Total realized / unrealized gains (losses)
Included in net income(a)	1	1
Included in regulatory assets	0	0
Purchases, sales, issuances and settlements
Transfers out of Level 3		0
Ending Balance	41	36
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss)	1	1
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	40	35
Total realized / unrealized gains (losses)
Included in net income(a)	1	1
Included in regulatory assets	0	0
Purchases, sales, issuances and settlements
Transfers out of Level 3		0
Ending Balance	41	36
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss)	$ 1	$ 1

Fair Value of Financial Asset_6

Fair Value of Financial Assets and Liabilities - Fair Value Inputs Assets Quantitative Information (Details) - Fair Value, Inputs, Level 3 [Member] - Derivative [Member] - USD ($)	Mar. 31, 2023	Dec. 31, 2022
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	$ (98,000,000)	$ (84,000,000)
Discounted Cash Flow [Member] \| Minimum [Member]
Derivatives Fair Value Footnotes [Abstract]
Fair Value Inputs Forward Power Price	22.49	34.78
Discounted Cash Flow [Member] \| Maximum [Member]
Derivatives Fair Value Footnotes [Abstract]
Fair Value Inputs Forward Power Price	83.26	75.71
Discounted Cash Flow [Member] \| Arithmetic Average [Member]
Derivatives Fair Value Footnotes [Abstract]
Fair Value Inputs Forward Power Price	47.69	48.44
Commonwealth Edison Co [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	$ (98,000,000)	$ (84,000,000)
Commonwealth Edison Co [Member] \| Discounted Cash Flow [Member] \| Minimum [Member]
Derivatives Fair Value Footnotes [Abstract]
Fair Value Inputs Forward Power Price	22.49	34.78
Commonwealth Edison Co [Member] \| Discounted Cash Flow [Member] \| Maximum [Member]
Derivatives Fair Value Footnotes [Abstract]
Fair Value Inputs Forward Power Price	83.26	75.71
Commonwealth Edison Co [Member] \| Discounted Cash Flow [Member] \| Arithmetic Average [Member]
Derivatives Fair Value Footnotes [Abstract]
Fair Value Inputs Forward Power Price	47.69	48.44

Commitments and Contingencies -

Commitments and Contingencies - Narrative (Details) $ in Millions	1 Months Ended
	Nov. 30, 2020 USD ($)	Mar. 31, 2023 USD ($) MGPSite
Commonwealth Edison Co [Member]
Commitments And Contingencies Additional Narrative Information [Line Items]
Mgp Site Contingency Monitoring Count \| MGPSite		20
Deferred Prosecution Agreement Payments \| $	$ 200
Customer Refund Liability, Current \| $		$ 38
Commonwealth Edison Co [Member] \| Illinois Chamber of Commerce
Commitments And Contingencies Additional Narrative Information [Line Items]
Customer Refund Liability, Current \| $		$ 31
PECO Energy Co [Member]
Commitments And Contingencies Additional Narrative Information [Line Items]
Mgp Site Contingency Monitoring Count \| MGPSite		6
Baltimore Gas and Electric Company [Member]
Commitments And Contingencies Additional Narrative Information [Line Items]
Mgp Site Contingency Monitoring Count \| MGPSite		4
Delmarva Power and Light Company [Member]
Commitments And Contingencies Additional Narrative Information [Line Items]
Mgp Site Contingency Count \| MGPSite		1
Exelon Business Services Co Affiliate [Member]
Commitments And Contingencies Additional Narrative Information [Line Items]
Deferred Prosecution Agreement Liability, Current \| $		$ 173

Commitments and Contingencies_3

Commitments and Contingencies - Merger Commitment (Details) $ in Millions	Mar. 31, 2023 USD ($)
Other Commitments [Line Items]
Other Commitment	$ 631
Pepco Holdings LLC [Member]
Other Commitments [Line Items]
Other Commitment	124
Potomac Electric Power Company [Member]
Other Commitments [Line Items]
Other Commitment	94
Delmarva Power and Light Company [Member]
Other Commitments [Line Items]
Other Commitment	18
Atlantic City Electric Company [Member]
Other Commitments [Line Items]
Other Commitment	12
Pepco Holdings Inc [Member]
Other Commitments [Line Items]
Other Commitment	513
Pepco Holdings Inc [Member] \| Remaining commitment
Other Commitments [Line Items]
Other Commitment	48
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	42
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	37
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	3
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	$ 2

Commitments and Contingencies_4

Commitments and Contingencies - Schedule of Commercial Commitments (Details) $ in Millions	Mar. 31, 2023 USD ($)
Other Commitments [Line Items]
Other Commitment	$ 631
Other Commitment, to be Paid, Remainder of Fiscal Year	207
Other Commitment, to be Paid, Year One	22
Other Commitment, to be Paid, Year Two	6
Other Commitment, to be Paid, Year Three	5
Other Commitment, to be Paid, Year Four	4
Other Commitment, to be Paid, Year Five and Beyond	387
Guarantor Obligations, Maximum Exposure, Undiscounted	65
Letters of Credit
Other Commitments [Line Items]
Other Commitment	19
Other Commitment, to be Paid, Remainder of Fiscal Year	17
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
Surety Bonds
Other Commitments [Line Items]
Other Commitment	205
Other Commitment, to be Paid, Remainder of Fiscal Year	190
Other Commitment, to be Paid, Year One	15
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
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	29
Other Commitment, to be Paid, Remainder of Fiscal Year	0
Other Commitment, to be Paid, Year One	5
Other Commitment, to be Paid, Year Two	6
Other Commitment, to be Paid, Year Three	5
Other Commitment, to be Paid, Year Four	4
Other Commitment, to be Paid, Year Five and Beyond	9
Commonwealth Edison Co [Member]
Other Commitments [Line Items]
Other Commitment	259
Other Commitment, to be Paid, Remainder of Fiscal Year	52
Other Commitment, to be Paid, Year One	7
Other Commitment, to be Paid, Year Two	0
Other Commitment, to be Paid, Year Three	0
Other Commitment, to be Paid, Year Four	0
Other Commitment, to be Paid, Year Five and Beyond	200
Commonwealth Edison Co [Member] \| Letters of Credit
Other Commitments [Line Items]
Other Commitment	12
Other Commitment, to be Paid, Remainder of Fiscal Year	10
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
Commonwealth Edison Co [Member] \| Surety Bonds
Other Commitments [Line Items]
Other Commitment	47
Other Commitment, to be Paid, Remainder of Fiscal Year	42
Other Commitment, to be Paid, Year One	5
Other Commitment, to be Paid, Year Two	0
Other Commitment, to be Paid, Year Three	0
Other Commitment, to be Paid, Year Four	0
Other Commitment, to be Paid, Year Five 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	181
Other Commitment, to be Paid, Remainder of Fiscal Year	2
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	178
PECO Energy Co [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
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	1
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, after Year Five	0
Baltimore Gas and Electric Company [Member]
Other Commitments [Line Items]
Other Commitment	5
Other Commitment, to be Paid, Remainder of Fiscal Year	4
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	3
Other Commitment, to be Paid, Remainder of Fiscal Year	2
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	124
Other Commitment, to be Paid, Remainder of Fiscal Year	90
Other Commitment, to be Paid, Year One	10
Other Commitment, to be Paid, Year Two	6
Other Commitment, to be Paid, Year Three	5
Other Commitment, to be Paid, Year Four	4
Other Commitment, to be Paid, Year Five and Beyond	9
Guarantor Obligations, Maximum Exposure, Undiscounted	65
Pepco Holdings LLC [Member] \| Surety Bonds
Other Commitments [Line Items]
Other Commitment	95
Other Commitment, to be Paid, Remainder of Fiscal Year	90
Other Commitment, to be Paid, Year One	5
Other Commitment, to be Paid, Year Two	0
Other Commitment, to be Paid, Year Three	0
Other Commitment, to be Paid, Year Four	0
Other Commitment, to be Paid, Year Five and Beyond	0
Pepco Holdings LLC [Member] \| Guaranteed lease residual values
Other Commitments [Line Items]
Other Commitment	29
Other Commitment, to be Paid, Remainder of Fiscal Year	0
Other Commitment, to be Paid, Year One	5
Other Commitment, to be Paid, Year Two	6
Other Commitment, to be Paid, Year Three	5
Other Commitment, to be Paid, Year Four	4
Other Commitment, to be Paid, Year Five and Beyond	9
Potomac Electric Power Company [Member]
Other Commitments [Line Items]
Other Commitment	94
Other Commitment, to be Paid, Remainder of Fiscal Year	84
Other Commitment, to be Paid, Year One	2
Other Commitment, to be Paid, Year Two	2
Other Commitment, to be Paid, Year Three	2
Other Commitment, to be Paid, Year Four	1
Other Commitment, to be Paid, Year Five and Beyond	3
Guarantor Obligations, Maximum Exposure, Undiscounted	21
Potomac Electric Power Company [Member] \| Surety Bonds
Other Commitments [Line Items]
Other Commitment	84
Other Commitment, to be Paid, Remainder of Fiscal Year	84
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
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	2
Other Commitment, to be Paid, Year Two	2
Other Commitment, to be Paid, Year Three	2
Other Commitment, to be Paid, Year Four	1
Other Commitment, to be Paid, Year Five and Beyond	3
Delmarva Power and Light Company [Member]
Other Commitments [Line Items]
Other Commitment	18
Other Commitment, to be Paid, Remainder of Fiscal Year	2
Other Commitment, to be Paid, Year One	6
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	4
Guarantor Obligations, Maximum Exposure, Undiscounted	27
Delmarva Power and Light Company [Member] \| Surety Bonds
Other Commitments [Line Items]
Other Commitment	6
Other Commitment, to be Paid, Remainder of Fiscal Year	2
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	12
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	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	4
Atlantic City Electric Company [Member]
Other Commitments [Line Items]
Other Commitment	12
Other Commitment, to be Paid, Remainder of Fiscal Year	4
Other Commitment, to be Paid, Year One	2
Other Commitment, to be Paid, Year Two	2
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	2
Guarantor Obligations, Maximum Exposure, Undiscounted	17
Atlantic City Electric Company [Member] \| Surety Bonds
Other Commitments [Line Items]
Other Commitment	5
Other Commitment, to be Paid, Remainder of Fiscal Year	4
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
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	2
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	$ 2
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	9 years

Commitments and Contingencies_5

Commitments and Contingencies - Schedule of Accruals for Environmental Matters (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Site Contingency [Line Items]
Total environmental investigation and remediation reserve	$ 421	$ 409
Commonwealth Edison Co [Member]
Site Contingency [Line Items]
Total environmental investigation and remediation reserve	313	325
PECO Energy Co [Member]
Site Contingency [Line Items]
Total environmental investigation and remediation reserve	25	25
Baltimore Gas and Electric Company [Member]
Site Contingency [Line Items]
Total environmental investigation and remediation reserve	9	9
Pepco Holdings LLC [Member]
Site Contingency [Line Items]
Total environmental investigation and remediation reserve	70	46
Potomac Electric Power Company [Member]
Site Contingency [Line Items]
Total environmental investigation and remediation reserve	68	44
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	343	355
Accrual For MGP Investigation And Remediation [Member] \| Commonwealth Edison Co [Member]
Site Contingency [Line Items]
Total environmental investigation and remediation reserve	312	324
Accrual For MGP Investigation And Remediation [Member] \| PECO Energy Co [Member]
Site Contingency [Line Items]
Total environmental investigation and remediation reserve	23	23
Accrual For MGP Investigation And Remediation [Member] \| Baltimore Gas and Electric Company [Member]
Site Contingency [Line Items]
Total environmental investigation and remediation reserve	8	8
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

Shareholder's Equity (Details)

Shareholder's Equity (Details) $ in Millions	Aug. 04, 2022 USD ($)
Equity Distribution Agreement	$ 1,000

Changes in Accumulated Other _3

Changes in Accumulated Other Comprehensive Income - Schedule of Changes in AOCI (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Movement in Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	$ 24,744	$ 34,795
Other comprehensive income (loss), net of income taxes	(1)	14
Ending balance	25,066	23,491
Gains (Losses) on Cash Flow Hedges
Movement in Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	2	(6)
OCI before reclassifications	6
Amounts reclassified from AOCI	0	0
Other comprehensive income (loss), net of income taxes	6	0
Ending balance	8	0
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	(640)	(2,721)
OCI before reclassifications	(10)
Amounts reclassified from AOCI	3	14
Other comprehensive income (loss), net of income taxes	(7)	14
Ending balance	(647)	(713)
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)
OCI before reclassifications	0
Amounts reclassified from AOCI	0	0
Other comprehensive income (loss), net of income taxes	0	0
Ending balance	0	0
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	(638)	(2,750)
OCI before reclassifications	(4)
Amounts reclassified from AOCI	3	14
Other comprehensive income (loss), net of income taxes	(1)	14
Ending balance	$ (639)	(713)
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
	Mar. 31, 2023	Mar. 31, 2022
Actuarial losses
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), Tax	$ (1)	$ (5)
Pension and Non-Pension Postretirement Benefit Plan Items
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), Tax	3	0
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), Tax	$ (1)	$ 0

Supplemental Financial Inform_3

Supplemental Financial Information - Operations (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Other, Net [Abstract]
AFUDC - Equity	$ 38	$ 36
Non-service net periodic benefit cost	(1)	17
Commonwealth Edison Co [Member]
Other, Net [Abstract]
AFUDC - Equity	10	8
Non-service net periodic benefit cost	0	0
PECO Energy Co [Member]
Other, Net [Abstract]
AFUDC - Equity	6	7
Non-service net periodic benefit cost	0	0
Baltimore Gas and Electric Company [Member]
Other, Net [Abstract]
AFUDC - Equity	3	6
Non-service net periodic benefit cost	0	0
Pepco Holdings LLC [Member]
Other, Net [Abstract]
AFUDC - Equity	19	15
Non-service net periodic benefit cost	0	0
Potomac Electric Power Company [Member]
Other, Net [Abstract]
AFUDC - Equity	14	11
Non-service net periodic benefit cost	0	0
Delmarva Power and Light Company [Member]
Other, Net [Abstract]
AFUDC - Equity	2	2
Non-service net periodic benefit cost	0	0
Atlantic City Electric Company [Member]
Other, Net [Abstract]
AFUDC - Equity	3	2
Non-service net periodic benefit cost	$ 0	$ 0

Supplemental Financial Inform_4

Supplemental Financial Information - Taxes Other Than Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Supplemental Statement of Operations Information [Line Items]
Utility taxes	$ 220	$ 221
Property	99	94
Payroll	32	37
Commonwealth Edison Co [Member]
Supplemental Statement of Operations Information [Line Items]
Utility taxes	74	78
Property	10	10
Payroll	7	7
PECO Energy Co [Member]
Supplemental Statement of Operations Information [Line Items]
Utility taxes	40	38
Property	4	4
Payroll	5	4
Baltimore Gas and Electric Company [Member]
Supplemental Statement of Operations Information [Line Items]
Utility taxes	29	27
Property	50	46
Payroll	5	4
Pepco Holdings LLC [Member]
Supplemental Statement of Operations Information [Line Items]
Utility taxes	77	78
Property	35	34
Payroll	7	7
Potomac Electric Power Company [Member]
Supplemental Statement of Operations Information [Line Items]
Utility taxes	68	70
Property	24	23
Payroll	2	2
Delmarva Power and Light Company [Member]
Supplemental Statement of Operations Information [Line Items]
Utility taxes	8	7
Property	11	10
Payroll	1	1
Atlantic City Electric Company [Member]
Supplemental Statement of Operations Information [Line Items]
Utility taxes	1	1
Property	0	1
Payroll	$ 1	$ 1

Supplemental Financial Inform_5

Supplemental Financial Information - Cash Flow (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Depreciation, Amortization and Accretion [Abstract]
Property, plant and equipment	$ 680	$ 726
Amortization of regulatory assets	178	179
Amortization of intangible assets, net	2	6
Amortization of energy contract assets and liabilities		3
Nuclear fuel		66
ARO accretion		44
Depreciation, Amortization and Accretion, Net	860	1,024
Other Non-Cash Operating Activities [Abstract]
Pension and non-pension postretirement benefit costs	45	44
Allowance for credit losses	70	78
Other decommissioning-related activity		36
Energy-related options		60
True-up adjustments to decoupling mechanisms and formula rates	279	29
Long-term incentive plan	2	25
Amortization of operating ROU asset	10	23
AFUDC - Equity	(38)	(36)
Change in environmental liabilities	25
Other Non-Cash Activity
Other Non-Cash Operating Activities [Abstract]
True-up adjustments to decoupling mechanisms and formula rates	(282)	(29)
Return on borrowed funds
Other Non-Cash Operating Activities [Abstract]
AFUDC - Equity	(38)	(36)
Commonwealth Edison Co [Member]
Depreciation, Amortization and Accretion [Abstract]
Property, plant and equipment	267	254
Amortization of regulatory assets	71	67
Amortization of intangible assets, net	0	0
Amortization of energy contract assets and liabilities		0
Nuclear fuel		0
ARO accretion		0
Depreciation, Amortization and Accretion, Net	338	321
Other Non-Cash Operating Activities [Abstract]
Pension and non-pension postretirement benefit costs	6	16
Allowance for credit losses	0	17
Other decommissioning-related activity		0
Energy-related options		0
True-up adjustments to decoupling mechanisms and formula rates	153	40
Long-term incentive plan	0	0
Amortization of operating ROU asset	1	1
AFUDC - Equity	(10)	(8)
Change in environmental liabilities	0
Commonwealth Edison Co [Member] \| Other Non-Cash Activity
Other Non-Cash Operating Activities [Abstract]
True-up adjustments to decoupling mechanisms and formula rates	(153)	(40)
Commonwealth Edison Co [Member] \| Return on borrowed funds
Other Non-Cash Operating Activities [Abstract]
AFUDC - Equity	(10)	(8)
PECO Energy Co [Member]
Depreciation, Amortization and Accretion [Abstract]
Property, plant and equipment	95	88
Amortization of regulatory assets	3	4
Amortization of intangible assets, net	0	0
Amortization of energy contract assets and liabilities		0
Nuclear fuel		0
ARO accretion		0
Depreciation, Amortization and Accretion, Net	98	92
Other Non-Cash Operating Activities [Abstract]
Pension and non-pension postretirement benefit costs	(3)	(2)
Allowance for credit losses	37	27
Other decommissioning-related activity		0
Energy-related options		0
True-up adjustments to decoupling mechanisms and formula rates	(4)	6
Long-term incentive plan	0	0
Amortization of operating ROU asset	0	0
AFUDC - Equity	(6)	(7)
Change in environmental liabilities	0
PECO Energy Co [Member] \| Other Non-Cash Activity
Other Non-Cash Operating Activities [Abstract]
True-up adjustments to decoupling mechanisms and formula rates	4	(6)
PECO Energy Co [Member] \| Return on borrowed funds
Other Non-Cash Operating Activities [Abstract]
AFUDC - Equity	(6)	(7)
Baltimore Gas and Electric Company [Member]
Depreciation, Amortization and Accretion [Abstract]
Property, plant and equipment	124	117
Amortization of regulatory assets	43	54
Amortization of intangible assets, net	0	0
Amortization of energy contract assets and liabilities		0
Nuclear fuel		0
ARO accretion		0
Depreciation, Amortization and Accretion, Net	167	171
Other Non-Cash Operating Activities [Abstract]
Pension and non-pension postretirement benefit costs	14	12
Allowance for credit losses	18	18
Other decommissioning-related activity		0
Energy-related options		0
True-up adjustments to decoupling mechanisms and formula rates	65	(12)
Long-term incentive plan	0	0
Amortization of operating ROU asset	1	7
AFUDC - Equity	(3)	(6)
Change in environmental liabilities	0
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	(65)	12
Baltimore Gas and Electric Company [Member] \| Return on borrowed funds
Other Non-Cash Operating Activities [Abstract]
AFUDC - Equity	(3)	(6)
Pepco Holdings LLC [Member]
Depreciation, Amortization and Accretion [Abstract]
Property, plant and equipment	180	164
Amortization of regulatory assets	61	54
Amortization of intangible assets, net	0	0
Amortization of energy contract assets and liabilities		0
Nuclear fuel		0
ARO accretion		0
Depreciation, Amortization and Accretion, Net	241	218
Other Non-Cash Operating Activities [Abstract]
Pension and non-pension postretirement benefit costs	24	13
Allowance for credit losses	15	18
Other decommissioning-related activity		0
Energy-related options		0
True-up adjustments to decoupling mechanisms and formula rates	65	(5)
Long-term incentive plan	0	0
Amortization of operating ROU asset	7	7
AFUDC - Equity	(19)	(15)
Change in environmental liabilities	25
Pepco Holdings LLC [Member] \| Other Non-Cash Activity
Other Non-Cash Operating Activities [Abstract]
True-up adjustments to decoupling mechanisms and formula rates	(68)	5
Pepco Holdings LLC [Member] \| Return on borrowed funds
Other Non-Cash Operating Activities [Abstract]
AFUDC - Equity	(19)	(15)
Potomac Electric Power Company [Member]
Depreciation, Amortization and Accretion [Abstract]
Property, plant and equipment	76	72
Amortization of regulatory assets	32	36
Amortization of intangible assets, net	0	0
Amortization of energy contract assets and liabilities		0
Nuclear fuel		0
ARO accretion		0
Depreciation, Amortization and Accretion, Net	108	108
Other Non-Cash Operating Activities [Abstract]
Pension and non-pension postretirement benefit costs	8	2
Allowance for credit losses	7	9
Other decommissioning-related activity		0
Energy-related options		0
True-up adjustments to decoupling mechanisms and formula rates	39	(7)
Long-term incentive plan	0	0
Amortization of operating ROU asset	1	2
AFUDC - Equity	(14)	(11)
Change in environmental liabilities	25
Potomac Electric Power Company [Member] \| Other Non-Cash Activity
Other Non-Cash Operating Activities [Abstract]
True-up adjustments to decoupling mechanisms and formula rates	(39)	7
Potomac Electric Power Company [Member] \| Return on borrowed funds
Other Non-Cash Operating Activities [Abstract]
AFUDC - Equity	(14)	(11)
Delmarva Power and Light Company [Member]
Depreciation, Amortization and Accretion [Abstract]
Property, plant and equipment	51	45
Amortization of regulatory assets	9	12
Amortization of intangible assets, net	0	0
Amortization of energy contract assets and liabilities		0
Nuclear fuel		0
ARO accretion		0
Depreciation, Amortization and Accretion, Net	60	57
Other Non-Cash Operating Activities [Abstract]
Pension and non-pension postretirement benefit costs	4	1
Allowance for credit losses	5	6
Other decommissioning-related activity		0
Energy-related options		0
True-up adjustments to decoupling mechanisms and formula rates	9	(1)
Long-term incentive plan	0	0
Amortization of operating ROU asset	2	2
AFUDC - Equity	(2)	(2)
Change in environmental liabilities	0
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	(11)	1
Delmarva Power and Light Company [Member] \| Return on borrowed funds
Other Non-Cash Operating Activities [Abstract]
AFUDC - Equity	(2)	(2)
Atlantic City Electric Company [Member]
Depreciation, Amortization and Accretion [Abstract]
Property, plant and equipment	47	41
Amortization of regulatory assets	20	6
Amortization of intangible assets, net	0	0
Amortization of energy contract assets and liabilities		0
Nuclear fuel		0
ARO accretion		0
Depreciation, Amortization and Accretion, Net	67	47
Other Non-Cash Operating Activities [Abstract]
Pension and non-pension postretirement benefit costs	4	3
Allowance for credit losses	3	3
Other decommissioning-related activity		0
Energy-related options		0
True-up adjustments to decoupling mechanisms and formula rates	17	3
Long-term incentive plan	0	0
Amortization of operating ROU asset	1	1
AFUDC - Equity	(3)	(2)
Change in environmental liabilities	0
Atlantic City Electric Company [Member] \| Other Non-Cash Activity
Other Non-Cash Operating Activities [Abstract]
True-up adjustments to decoupling mechanisms and formula rates	(18)	(3)
Atlantic City Electric Company [Member] \| Return on borrowed funds
Other Non-Cash Operating Activities [Abstract]
AFUDC - Equity	$ (3)	$ (2)

Supplemental Financial Inform_6

Supplemental Financial Information - Balance Sheet (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2021
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]
Cash and cash equivalents	$ 522	$ 407	$ 2,476	$ 672
Restricted cash	381	566	430	321
Restricted cash included in other long-term assets	180	117	92	44
Cash, restricted cash, and cash equivalents - Held for Sale				582
Total cash, restricted cash, and cash equivalents	1,083	1,090	2,998	1,619
Accrued Expenses [Abstract]
Compensation-related accruals	359	613
Taxes accrued	214	211
Interest accrued	373	338
Commonwealth Edison Co [Member]
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]
Cash and cash equivalents	75	67	343	131
Restricted cash	323	327	246	210
Restricted cash included in other long-term assets	180	117	92	43
Cash, restricted cash, and cash equivalents - Held for Sale				0
Total cash, restricted cash, and cash equivalents	578	511	681	384
Accrued Expenses [Abstract]
Compensation-related accruals	107	179
Taxes accrued	102	92
Interest accrued	78	124
PECO Energy Co [Member]
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]
Cash and cash equivalents	27	59	26	36
Restricted cash	9	9	8	8
Restricted cash included in other long-term assets	0	0	0	0
Cash, restricted cash, and cash equivalents - Held for Sale				0
Total cash, restricted cash, and cash equivalents	36	68	34	44
Accrued Expenses [Abstract]
Compensation-related accruals	43	81
Taxes accrued	3	10
Interest accrued	44	47
Baltimore Gas and Electric Company [Member]
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]
Cash and cash equivalents	20	43	41	51
Restricted cash	1	24	34	4
Restricted cash included in other long-term assets	0	0	0	0
Cash, restricted cash, and cash equivalents - Held for Sale				0
Total cash, restricted cash, and cash equivalents	21	67	75	55
Accrued Expenses [Abstract]
Compensation-related accruals	42	79
Taxes accrued	83	34
Interest accrued	45	42
Pepco Holdings LLC [Member]
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]
Cash and cash equivalents	367	198	796	136
Restricted cash	29	175	106	77
Restricted cash included in other long-term assets	0	0	0	0
Cash, restricted cash, and cash equivalents - Held for Sale				0
Total cash, restricted cash, and cash equivalents	396	373	902	213
Accrued Expenses [Abstract]
Compensation-related accruals	59	104
Taxes accrued	94	70
Interest accrued	75	61
Potomac Electric Power Company [Member]
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]
Cash and cash equivalents	126	45	502	34
Restricted cash	27	54	34	34
Restricted cash included in other long-term assets	0	0	0	0
Cash, restricted cash, and cash equivalents - Held for Sale				0
Total cash, restricted cash, and cash equivalents	153	99	536	68
Accrued Expenses [Abstract]
Compensation-related accruals	18	29
Taxes accrued	67	52
Interest accrued	35	32
Delmarva Power and Light Company [Member]
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]
Cash and cash equivalents	142	31	120	28
Restricted cash	1	121	73	43
Restricted cash included in other long-term assets	0	0	0	0
Cash, restricted cash, and cash equivalents - Held for Sale				0
Total cash, restricted cash, and cash equivalents	143	152	193	71
Accrued Expenses [Abstract]
Compensation-related accruals	11	20
Taxes accrued	14	8
Interest accrued	22	9
Atlantic City Electric Company [Member]
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]
Cash and cash equivalents	71	72	168	29
Restricted cash	0	0	0	0
Restricted cash included in other long-term assets	0	0	0	0
Cash, restricted cash, and cash equivalents - Held for Sale				0
Total cash, restricted cash, and cash equivalents	71	72	$ 168	$ 29
Accrued Expenses [Abstract]
Compensation-related accruals	10	16
Taxes accrued	16	12
Interest accrued	$ 16	$ 14

Related Party Transactions - Ut

Related Party Transactions - Utility Registrants' expense with Generation (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Related Party Transaction [Line Items]
Purchased power and/or fuel from affiliates	$ 0	$ (159)
Exelon Generation Co L L C [Member] \| Commonwealth Edison Co Affiliate [Member]
Related Party Transaction [Line Items]
Revenue from Related Parties		59
Exelon Generation Co L L C [Member] \| PECO Energy Co Affiliate [Member]
Related Party Transaction [Line Items]
Revenue from Related Parties		33
Exelon Generation Co L L C [Member] \| Baltimore Gas And Electric Company Affiliate [Member]
Related Party Transaction [Line Items]
Revenue from Related Parties		18
Exelon Generation Co L L C [Member] \| Pepco Holdings LLC Affiliate [Member]
Related Party Transaction [Line Items]
Revenue from Related Parties		51
Exelon Generation Co L L C [Member] \| Potomac Electric Power Co Affiliate [Member]
Related Party Transaction [Line Items]
Revenue from Related Parties		39
Exelon Generation Co L L C [Member] \| Delmarva Power and Light Co Affiliate [Member]
Related Party Transaction [Line Items]
Revenue from Related Parties		10
Exelon Generation Co L L C [Member] \| Atlantic City Electric Co Affiliate [Member]
Related Party Transaction [Line Items]
Revenue from Related Parties		$ 2

Related Party Transactions - BS

Related Party Transactions - BSC and PHISCO Service Companies (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Exelon Business Services Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction Capitalized Costs Support Services	$ 175	$ 205
PHI Service Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction Capitalized Costs Support Services	24	19
Commonwealth Edison Co [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Expenses from Transactions with Related Party	83	85
Commonwealth Edison Co [Member] \| Exelon Business Services Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Expenses from Transactions with Related Party	83	85
Related Party Transaction Capitalized Costs Support Services	81	85
PECO Energy Co [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Expenses from Transactions with Related Party	51	51
PECO Energy Co [Member] \| Exelon Business Services Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Expenses from Transactions with Related Party	51	49
Related Party Transaction Capitalized Costs Support Services	30	36
Baltimore Gas and Electric Company [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Expenses from Transactions with Related Party	54	51
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	54	51
Related Party Transaction Capitalized Costs Support Services	24	38
Pepco Holdings LLC [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Expenses from Transactions with Related Party	42	51
Pepco Holdings LLC [Member] \| Exelon Business Services Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Expenses from Transactions with Related Party	42	50
Related Party Transaction Capitalized Costs Support Services	40	46
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
Related Party Transaction Capitalized Costs Support Services	24	19
Potomac Electric Power Company [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Expenses from Transactions with Related Party	57	58
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	29
Related Party Transaction Capitalized Costs Support Services	14	17
Potomac Electric Power Company [Member] \| PHI Service Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Expenses from Transactions with Related Party	30	29
Related Party Transaction Capitalized Costs Support Services	11	8
Delmarva Power and Light Company [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Expenses from Transactions with Related Party	41	42
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	18
Related Party Transaction Capitalized Costs Support Services	10	14
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	24	24
Related Party Transaction Capitalized Costs Support Services	7	6
Atlantic City Electric Company [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Expenses from Transactions with Related Party	37	37
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	15
Related Party Transaction Capitalized Costs Support Services	14	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
Related Party Transaction Capitalized Costs Support Services	$ 6	$ 5

Related Party Transactions - Cu

Related Party Transactions - Current Receivables From/Payables To Affiliates (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	$ 281	$ 255
Accounts Payable, Related Parties, Current	5	5
Commonwealth Edison Co [Member]
Related Party Transaction [Line Items]
Accounts Payable, Related Parties, Current	84	74
Accounts Receivable, Related Parties, Current	3	3
Commonwealth Edison Co [Member] \| Affiliated Entity [Member]
Related Party Transaction [Line Items]
Accounts Payable, Related Parties, Current	84	74
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	48	42
Accounts Receivable, Related Parties, Current	2	4
PECO Energy Co [Member] \| Affiliated Entity [Member]
Related Party Transaction [Line Items]
Accounts Payable, Related Parties, Current	48	42
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	0
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	1	2
PECO Energy Co [Member] \| Atlantic City Electric Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	1	2
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	37	39
Accounts Receivable, Related Parties, Current	0	0
Baltimore Gas and Electric Company [Member] \| Affiliated Entity [Member]
Related Party Transaction [Line Items]
Accounts Payable, Related Parties, Current	37	39
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	0
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	66	66
Accounts Receivable, Related Parties, Current	2	2
Pepco Holdings LLC [Member] \| Affiliated Entity [Member]
Related Party Transaction [Line Items]
Accounts Payable, Related Parties, Current	17	14
Potomac Electric Power Company [Member]
Related Party Transaction [Line Items]
Accounts Payable, Related Parties, Current	38	34
Accounts Receivable, Related Parties, Current	1	0
Potomac Electric Power Company [Member] \| Affiliated Entity [Member]
Related Party Transaction [Line Items]
Accounts Payable, Related Parties, Current	38	34
Potomac Electric Power Company [Member] \| Commonwealth Edison Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	0	0
Potomac Electric Power Company [Member] \| PECO Energy Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	0	0
Potomac Electric Power Company [Member] \| Baltimore Gas And Electric Company Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	0	0
Potomac Electric Power Company [Member] \| Pepco Holdings LLC Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	0	0
Potomac Electric Power Company [Member] \| Delmarva Power and Light Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	0	0
Potomac Electric Power Company [Member] \| Atlantic City Electric Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	1	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	26	22
Accounts Receivable, Related Parties, Current	0	0
Delmarva Power and Light Company [Member] \| Affiliated Entity [Member]
Related Party Transaction [Line Items]
Accounts Payable, Related Parties, Current	26	22
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	0
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	26	26
Accounts Receivable, Related Parties, Current	2	1
Atlantic City Electric Company [Member] \| Affiliated Entity [Member]
Related Party Transaction [Line Items]
Accounts Payable, Related Parties, Current	26	26
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	1	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	0
Atlantic City Electric Company [Member] \| Potomac Electric Power Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	0	0
Atlantic City Electric Company [Member] \| Delmarva Power and Light Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	0	0
Atlantic City Electric Company [Member] \| Other Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	1	1
Business Services Company [Member]
Related Party Transaction [Line Items]
Accounts Receivable, Related Parties, Current	207	193
Business Services Company [Member] \| Commonwealth Edison Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	78	66
Business Services Company [Member] \| PECO Energy Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	39	39
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	35	38
Business Services Company [Member] \| Pepco Holdings LLC Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	7	4
Business Services Company [Member] \| Potomac Electric Power Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	22	20
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	13	12
Business Services Company [Member] \| Atlantic City Electric Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	13	14
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	39	30
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	15	13
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	12	8
PHI Service Company [Member] \| Atlantic City Electric Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	11	9
PHI Service Company [Member] \| Other Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	1	0
Other Legal Entities [Member]
Related Party Transaction [Line Items]
Accounts Receivable, Related Parties, Current	27	24
Other Legal Entities [Member] \| Affiliated Entity [Member]
Related Party Transaction [Line Items]
Accounts Payable, Related Parties, Current	5	4
Other Legal Entities [Member] \| Commonwealth Edison Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	6	8
Other Legal Entities [Member] \| PECO Energy Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	8	3
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	1
Other Legal Entities [Member] \| Pepco Holdings LLC Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	10	10
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	1
Other Legal Entities [Member] \| Delmarva Power and Light Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	0	0
Other Legal Entities [Member] \| Atlantic City Electric Co Affiliate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party, Current	$ 0	$ 1

Related Party Transactions - Lo

Related Party Transactions - Long Term Debt to Financing Trusts (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
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