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, Common	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 member									167			167	227	227					704		704	387	387		144	144		173	173
Ending balance (in shares) at Mar. 31, 2022	982,042
Ending balance at Mar. 31, 2022	$ 23,491		20,299		(123)	4,028	(713)	0
Ending Balance at Mar. 31, 2022									12,566	1,588	1,735	9,243	5,445	3,655	1,790	4,692	2,575	2,117				3,866	2,689	1,177	1,936	1,353	583	1,755	1,763	(8)
Ending Balance at Mar. 31, 2022																			11,317	(182)	11,499
Beginning balance (in shares) at Dec. 31, 2021	981,291
Beginning balance at Dec. 31, 2021	$ 34,795		20,324		(123)	16,942	(2,750)	402
Beginning Balance at Dec. 31, 2021									12,355	1,588	1,691	9,076	5,112	3,428	1,684	4,570	2,575	1,995				3,475	2,302	1,173	1,777	1,209	568	1,575	1,590	(15)
Beginning Balance at Dec. 31, 2021																			10,585	(210)	10,795
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	1,063								415				339			234			230			116			77			37
Other comprehensive income (loss), net of income taxes	$ 26						26
Ending balance (in shares) at Jun. 30, 2022	982,305
Ending balance at Jun. 30, 2022	$ 23,656		20,319		(123)	4,161	(701)	0
Ending Balance at Jun. 30, 2022									12,816	1,588	1,817	9,411	5,478	3,655	1,823	4,840	2,761	2,079				3,678	2,689	989	1,942	1,353	589	1,747	1,763	(16)
Ending Balance at Jun. 30, 2022																			11,124	(375)	11,499
Beginning balance (in shares) at Mar. 31, 2022	982,042
Beginning balance at Mar. 31, 2022	$ 23,491		20,299		(123)	4,028	(713)	0
Beginning Balance at Mar. 31, 2022									12,566	1,588	1,735	9,243	5,445	3,655	1,790	4,692	2,575	2,117				3,866	2,689	1,177	1,936	1,353	583	1,755	1,763	(8)
Beginning Balance at Mar. 31, 2022																			11,317	(182)	11,499
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	$ 465					465		0	227		227		133		133	37		37	100	100		70		70	21		21	11		11
Long -Term Incentive Plan Activity (shares)	21
Long-Term Incentive Plan Activity	$ 10		10
Employee stock purchase plan issuances (shares)		242
Employee stock purchase plan issuances	$ 10		10
Common Stock, Dividends, Per Share, Declared	$ 0.34
Common stock dividends	$ (332)					(332)			(145)		(145)		(100)		(100)	(75)		(75)				(258)		(258)	(15)		(15)	(19)		(19)
Other comprehensive income (loss), net of income taxes	$ 12						12
Distributions to member																			(293)	(293)
Contributions from member									168			168				186	186
Ending balance (in shares) at Jun. 30, 2022	982,305
Ending balance at Jun. 30, 2022	$ 23,656		20,319		(123)	4,161	(701)	0
Ending Balance at Jun. 30, 2022									12,816	1,588	1,817	9,411	5,478	3,655	1,823	4,840	2,761	2,079				3,678	2,689	989	1,942	1,353	589	1,747	1,763	(16)
Ending Balance at Jun. 30, 2022																			11,124	(375)	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 member									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									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
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)	1,012								489				263			241			258			130			85			51
Other comprehensive income (loss), net of income taxes	$ 8						8
Ending balance (in shares) at Jun. 30, 2023	997,052
Ending balance at Jun. 30, 2023	$ 25,079		20,941		(123)	4,891	(630)	0
Ending Balance at Jun. 30, 2023	$ 25,079								13,852	1,588	2,146	10,118	5,954	4,032	1,922	5,256	3,098	2,158				4,039	3,010	1,029	2,074	1,455	619	1,831	1,828	3
Ending Balance at Jun. 30, 2023																			11,681	(306)	11,987
Beginning balance (in shares) at Mar. 31, 2023	996,402
Beginning balance at Mar. 31, 2023	$ 25,066		20,921		(123)	4,907	(639)	0
Beginning Balance at Mar. 31, 2023									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
Beginning Balance at Mar. 31, 2023																			11,678	(309)	11,987
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	$ 343					343		0	249		249		97		97	42		42	103	103		64		64	25		25	18		18
Long -Term Incentive Plan Activity (shares)	372
Long-Term Incentive Plan Activity	$ 9		9
Employee stock purchase plan issuances (shares)	278
Employee stock purchase plan issuances	$ 11		11
Common Stock, Dividends, Per Share, Declared	$ 0.36
Common stock dividends	$ (359)					(359)			(187)		(187)		(101)		(101)	(79)		(79)				(67)		(67)	(18)		(18)	(15)		(15)
Other comprehensive income (loss), net of income taxes	$ 9						9
Distributions to member																			(100)	(100)
Contributions from member									186			186
Ending balance (in shares) at Jun. 30, 2023	997,052
Ending balance at Jun. 30, 2023	$ 25,079		$ 20,941		$ (123)	$ 4,891	$ (630)	$ 0
Ending Balance at Jun. 30, 2023	$ 25,079								$ 13,852	$ 1,588	$ 2,146	$ 10,118	$ 5,954	$ 4,032	$ 1,922	$ 5,256	$ 3,098	$ 2,158				$ 4,039	$ 3,010	$ 1,029	$ 2,074	$ 1,455	$ 619	$ 1,831	$ 1,828	$ 3
Ending Balance at Jun. 30, 2023																			$ 11,681	$ (306)	$ 11,987