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Consolidated Statements of Comprehensive Income (Unaudited) (Parenthetical) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Net deferred gains (losses) on derivative-hedging activities, tax $ (5) $ (8) $ (49) $ (34)
Changes in unrealized net gains (losses) on investment securities, tax (27) (18) (80) (43)
Changes in net unrecognized pension and other postretirement benefit costs, tax   (10)   (10)
Net derivative (gains) losses on derivative-hedging activities, tax 10 21 35 88
Net realized gains on investment securities, tax 2 7 20 13
Net pension and other postretirement benefit costs, tax (7) (4) (25) (16)
Changes in other comprehensive income (loss) from equity method investees, tax     (1)  
Dominion Energy Gas Holdings, LLC        
Net deferred gains (losses) on derivative-hedging activities, tax (1) (3) (2) 5
Net derivative (gains) losses on derivative-hedging activities, tax 3 2 3 2
Net pension and other postretirement benefit costs, tax $ (1) $ (1) $ (2) $ (2)