Consolidated Statements of Changes in Shareholders Equity (Unaudited) - Exelon - USD ($) shares in Thousands, $ in Millions	Total	Common Stock	Treasury Stock	Retained Earnings	Accumulated Other Comprehensive Loss, net
Beginning balance (in shares) at Dec. 31, 2023	1,001,249
Beginning balance at Dec. 31, 2023	$ 25,755	$ 21,114	$ (123)	$ 5,490	$ (726)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 658			658
Long-term incentive plan activity (in shares)	333
Long-term incentive plan activity	$ 2	2
Employee stock purchase plan activity (shares)	(276)
Employee stock purchase plan activity	$ 13	13
Common stock dividends	(381)			(381)
Other comprehensive income, net of income taxes	$ 14				14
Ending balance (in shares) at Mar. 31, 2024	1,001,858
Ending balance at Mar. 31, 2024	$ 26,061	21,129	(123)	5,767	(712)
Beginning balance (in shares) at Dec. 31, 2024	1,007,046
Beginning balance at Dec. 31, 2024	$ 26,921	21,338	(123)	6,426	(720)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 908			908
Long-term incentive plan activity (in shares)	299
Long-term incentive plan activity	$ 4	4
Employee stock purchase plan activity (shares)	(8)
Employee stock purchase plan activity	$ 2	2
Issuance of Common Stock (in shares)	4,031
Issuance of Common Stock	$ 173	173
Common stock dividends	(403)			(403)
Other comprehensive income, net of income taxes	$ 2				2
Ending balance (in shares) at Mar. 31, 2025	1,011,368
Ending balance at Mar. 31, 2025	$ 27,607	$ 21,517	$ (123)	$ 6,931	$ (718)