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Consolidated Statements of Comprehensive Income (Unaudited) (Parenthetical) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Net deferred gains (losses) on derivative-hedging activities, tax $ 11 $ (17) $ (26) $ (44)
Changes in unrealized net gains (losses) on investment securities, tax 2 (18) 6 (53)
Net derivative (gains) losses-hedging activities, tax (11) 11 (14) 25
Net realized gains on investment securities, tax (1) 2 (1) 18
Net pension and other postretirement benefit costs, tax (7) (10) (8) (18)
Changes in other comprehensive income (loss) from equity method investees, tax (1)   (1) (1)
Virginia Electric and Power Company        
Net deferred gains (losses) on derivative-hedging activities, tax   2 (2) 2
Changes in unrealized net gains (losses) on investment securities, tax   (3) 1 (7)
Net realized (gains) losses on nuclear decommissioning trust funds, tax       2
Dominion Energy Gas Holdings, LLC        
Net deferred gains (losses) on derivative-hedging activities, tax 7 (7) 3 (1)
Net derivative (gains) losses-hedging activities, tax $ (5) $ 7 (4)  
Net pension and other postretirement benefit costs, tax     $ (1) $ (1)