Statements of Changes in Shareholders Equity (Unaudited) - Pepco - USD ($) $ in Millions	Total	Retained Earnings	Potomac Electric Power Company	Potomac Electric Power Company Common Stock	Potomac Electric Power Company Retained Earnings
Beginning Balance at Dec. 31, 2022			$ 3,782	$ 2,767	$ 1,015
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 669	$ 669	65		65
Common stock dividends	(359)	(359)	(48)		(48)
Contributions from parent			243	243
Ending Balance at Mar. 31, 2023			4,042	3,010	1,032
Beginning Balance at Dec. 31, 2022			3,782	2,767	1,015
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,711		249
Ending Balance at Sep. 30, 2023			4,139	3,075	1,064
Beginning Balance at Mar. 31, 2023			4,042	3,010	1,032
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	343	343	64		64
Common stock dividends	(359)	(359)	(67)		(67)
Ending Balance at Jun. 30, 2023			4,039	3,010	1,029
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	700	700	120		120
Common stock dividends	(358)	(358)	(85)		(85)
Contributions from parent			65	65
Ending Balance at Sep. 30, 2023			4,139	3,075	1,064
Beginning Balance at Dec. 31, 2023	25,755		4,144	3,075	1,069
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	658	658	75		75
Common stock dividends	(381)	(381)	(51)		(51)
Contributions from parent			251	251
Ending Balance at Mar. 31, 2024			4,419	3,326	1,093
Beginning Balance at Dec. 31, 2023	25,755		4,144	3,075	1,069
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,813		323
Ending Balance at Sep. 30, 2024	26,622		4,441	3,335	1,106
Beginning Balance at Mar. 31, 2024			4,419	3,326	1,093
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	448	448	108		108
Common stock dividends	(380)	(380)	(102)		(102)
Ending Balance at Jun. 30, 2024			4,425	3,326	1,099
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	707	707	140		140
Common stock dividends	(381)	$ (381)	(133)		(133)
Contributions from parent			9	9
Ending Balance at Sep. 30, 2024	$ 26,622		$ 4,441	$ 3,335	$ 1,106