Consolidated Statement of Changes in Shareholders Equity - Exelon - USD ($) shares in Thousands, $ in Millions	Total	Common Stock	Treasury Stock, Common	Retained Earnings	Accumulated Other Comprehensive Income (Loss), net	Noncontrolling Interest [Member]
Beginning Balance (in shares) at Dec. 31, 2020	977,466
Beginning Balance at Dec. 31, 2020	$ 34,868	$ 19,373	$ (123)	$ 16,735	$ (3,400)	$ 2,283
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 1,829			1,706		123
Long-Term Incentive Plan Activity (shares)	1,734
Long-Term Incentive Plan Activity	$ 69	69
Employee stock purchase plan issuances, shares	2,091
Employee stock purchase plan issuances	$ 90	90
Changes in equity of noncontrolling interests	(37)					(37)
Acquisition of CENG noncontrolling interest	(885)	1,080				(1,965)
Proceeds from Issuance of Common Stock	0
Deferred Tax Liability Adjustment - Noncontrolling Interest	(290)	(290)
Common stock dividends	(1,499)			(1,499)
Acquisition of CENG noncontrolling interest	0	2				(2)
Other Comprehensive Income (Loss), Net of Tax	$ 650				650
Ending Balance (in shares) at Dec. 31, 2021	981,291
Ending Balance at Dec. 31, 2021	$ 34,795	20,324	(123)	16,942	(2,750)	402
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 2,171			2,170		1
Long-Term Incentive Plan Activity (shares)	561
Long-Term Incentive Plan Activity	$ 1	1
Employee stock purchase plan issuances, shares	983
Employee stock purchase plan issuances	$ 41	41
Changes in equity of noncontrolling interests	(7)					(7)
Distribution of Constellation	11,573	21		(13,179)	2,023	396
Proceeds from Issuance of Common Stock	$ 563	563
Stock Issued During Period, Shares, New Issues	12,995
Common stock dividends	$ (1,336)			(1,336)
Other Comprehensive Income (Loss), Net of Tax	$ 89				89
Ending Balance (in shares) at Dec. 31, 2022	995,830
Ending Balance at Dec. 31, 2022	$ 24,744	20,908	(123)	4,597	(638)	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 2,328			2,328		0
Long-Term Incentive Plan Activity (shares)	659
Long-Term Incentive Plan Activity	$ 19	19
Employee stock purchase plan issuances, shares	1,173
Employee stock purchase plan issuances	$ 47	47
Proceeds from Issuance of Common Stock	$ 140	140
Stock Issued During Period, Shares, New Issues	3,587
Common stock dividends	$ (1,435)			(1,435)
Other Comprehensive Income (Loss), Net of Tax	$ (88)				(88)
Ending Balance (in shares) at Dec. 31, 2023	1,001,249
Ending Balance at Dec. 31, 2023	$ 25,755	$ 21,114	$ (123)	$ 5,490	$ (726)	$ 0