Consolidated Statements of Changes in Shareholders Equity (Unaudited) - Exelon - USD ($) shares in Thousands, $ in Millions	Total	Correcting Adjustment [Member]	Common Stock	Common Stock Correcting Adjustment [Member]	Treasury Stock, Common	Retained Earnings	Accumulated Other Comprehensive Income (Loss) [Member]	Noncontrolling Interest [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
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 598					597		1
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	(332)					(332)
Other comprehensive income (loss), net of income taxes	$ 14						14
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
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
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,739
Issuance of common stock	563
Other comprehensive income (loss), net of income taxes	$ 35
Ending balance (in shares) at Sep. 30, 2022	995,575
Ending balance at Sep. 30, 2022	$ 24,582		20,895		(123)	4,502	(692)	0
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
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 465					465		0
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	(332)					(332)
Other comprehensive income (loss), net of income taxes	$ 12						12
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
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 676					676		0
Long -Term Incentive Plan Activity (shares)	0
Long-Term Incentive Plan Activity	$ 3		3
Employee stock purchase plan issuances (shares)	275
Employee stock purchase plan issuances	$ 10		10
Stock Issued During Period, Shares, New Issues	12,995
Issuance of common stock	$ 563		563
Common stock dividends	(335)					(335)
Other comprehensive income (loss), net of income taxes	$ 9						9
Ending balance (in shares) at Sep. 30, 2022	995,575
Ending balance at Sep. 30, 2022	$ 24,582		20,895		(123)	4,502	(692)	0
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
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 669					669		0
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	(359)					(359)
Other comprehensive income (loss), net of income taxes	$ (1)						(1)
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
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
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,711
Issuance of common stock	0
Other comprehensive income (loss), net of income taxes	$ 42
Ending balance (in shares) at Sep. 30, 2023	997,270
Ending balance at Sep. 30, 2023	$ 25,470		20,956		(123)	5,233	(596)	0
Ending Balance at Sep. 30, 2023	$ 25,470
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
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 343					343		0
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	(359)					(359)
Other comprehensive income (loss), net of income taxes	$ 9						9
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
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 700					700
Long -Term Incentive Plan Activity (shares)	(84)
Long-Term Incentive Plan Activity	$ 3		3
Employee stock purchase plan issuances (shares)	302
Employee stock purchase plan issuances	$ 12		12
Common stock dividends	(358)					(358)
Other comprehensive income (loss), net of income taxes	$ 34						34
Ending balance (in shares) at Sep. 30, 2023	997,270
Ending balance at Sep. 30, 2023	$ 25,470		$ 20,956		$ (123)	$ 5,233	$ (596)	$ 0
Ending Balance at Sep. 30, 2023	$ 25,470