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Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Net deferred gains (losses) on derivative-hedging activities, tax $ (3) $ (37) $ (74)
Changes in unrealized net gains (losses) on investment securities, tax (121) (53) 23
Changes in net unrecognized pension and other postretirement benefit costs, tax 32 189 29
Net derivative (gains) losses on derivative-hedging activities, tax 18 100 68
Net realized gains on investment securities, tax 21 15 29
Net pension and other postretirement benefit costs, tax (32) (22) (35)
Changes in other comprehensive income (loss) from equity method investees, tax (2)   1
Virginia Electric and Power Company      
Net deferred gains (losses) on derivative-hedging activities, tax 3 1 2
Changes in unrealized net gains (losses) on investment securities, tax (16) (7) 1
Net derivative (gains) losses on derivative-hedging activities, tax 0 0 0
Net realized gains on investment securities, tax 3 2 4
Dominion Energy Gas Holdings, LLC      
Net deferred gains (losses) on derivative-hedging activities, tax (3) 10 (4)
Changes in net unrecognized pension and other postretirement benefit costs, tax (8) 14 13
Net derivative (gains) losses on derivative-hedging activities, tax 3 (6) 3
Net pension and other postretirement benefit costs, tax $ (2) $ (2) $ (3)