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Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Net deferred losses on derivative-hedging activities, tax $ (6) $ 81 $ 35
Changes in unrealized net gains (losses) on investment securities, tax 7 (14) (14)
Changes in net unrecognized pension and other postretirement benefit costs, tax (54) (2) (4)
Net derivative (gains) losses-hedging activities, tax (15) (75) 21
Net realized (gains) losses on investment securities, tax 5 6 1
Net pension and other postretirement benefit costs, tax (29) (13) (23)
Changes in other comprehensive income from equity method investees, tax 1 (1)  
Virginia Electric and Power Company      
Net deferred losses on derivative-hedging activities, tax (4) 9 8
Changes in unrealized net gains (losses) on investment securities, tax   (3) (2)
Net derivative (gains) losses-hedging activities, tax (1)    
Net realized (gains) losses on investment securities, tax $ 1 $ 1 $ 1