Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Net deferred gains (losses) on derivatives-hedging activities, tax	$ (4)	$ 1	$ (22)
Changes in unrealized net gains (losses) on investment securities, tax	10	(19)	29
Changes in net unrecognized pension and other postretirement benefit costs (credits), tax	1		1
Net derivative (gains) losses-hedging activities, tax	(11)	(10)	(15)
Net realized (gains) losses on investment securities, tax	(3)	3	(6)
Net pension and other postretirement benefit costs (credits), tax	4	5	5
Net equity method investees, tax		(1)
Virginia Electric and Power Company
Net deferred gains (losses) on derivatives-hedging activities, tax	(4)	0	(20)
Changes in unrealized net gains (losses) on investment securities, tax	2	(3)	4
Net derivative (gains) losses-hedging activities, tax	0	(1)	(1)
Net realized (gains) losses on investment securities, tax	$ (1)	$ 0	$ 0