Consolidated Statements of Comprehensive Income (Unaudited) (Parenthetical) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Net deferred gain (losses) on derivative-hedging activities, tax	$ (6)	$ (4)	$ (5)	$ (22)
Changes in unrealized net gains (losses) on investment securities, tax	6	9	2	37
Changes in net unrecognized pension and other postretirement benefit costs, tax				(8)
Net derivative (gains) losses-hedging activities, tax	(3)	(4)	(8)	(11)
Net realized (gains) losses on investment securities, tax		(1)		(5)
Net pension and other postretirement benefit costs, tax	7	(9)	15	(21)
Net equity method investees, tax	(1)		(1)
Virginia Electric and Power Company
Net deferred gain (losses) on derivative-hedging activities, tax	(7)	(5)	(6)	(20)
Changes in unrealized net gains (losses) on investment securities, tax				4
Net derivative (gains) losses-hedging activities, tax	$ (1)	$ (1)	$ (1)	$ (1)