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Consolidated Statements of Comprehensive Income (Unaudited) (Parenthetical) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Net deferred gain (losses) on derivative-hedging activities, tax   $ (4) $ (8) $ 85
Changes in unrealized net gains (losses) on investment securities, tax   (2) 8 (12)
Changes in net unrecognized pension and other postretirement benefit costs, tax $ (1) 91 (8) 94
Net derivative (gains) losses-hedging activities, tax (4) (63) (12) (72)
Net realized (gains) losses on investment securities, tax 1 2 2 6
Net pension and other postretirement benefit costs, tax (6) (8) (22) (21)
Changes in other comprehensive income from equity method investees, tax 1 (1) 1 (1)
Virginia Electric and Power Company        
Net deferred gain (losses) on derivative-hedging activities, tax   (1) (6) 14
Changes in unrealized net gains (losses) on investment securities, tax   $ (1)   (2)
Net derivative (gains) losses-hedging activities, tax $ (1)   $ (1) (1)
Net realized (gains) losses on investment securities, tax       $ 1