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Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Net deferred losses on derivative-hedging activities, tax $ 81 $ 35 $ (10)
Changes in unrealized net gains (losses) on investment securities, tax (14) (14) 5
Changes in net unrecognized pension and other postretirement benefit costs, tax (2) (4) 75
Net derivative (gains) losses-hedging activities, tax (75) 21 (35)
Net realized (gains) losses on investment securities, tax 6 1 (2)
Net pension and other postretirement benefit costs, tax (13) (23) (21)
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 9 8 $ (1)
Changes in unrealized net gains (losses) on investment securities, tax (3) (2)  
Net realized (gains) losses on investment securities, tax $ 1 $ 1