Consolidated Statements of Comprehensive Income (Unaudited) (Parenthetical) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Net deferred gains on derivative-hedging activities, tax	$ (37)	$ (27)
Changes in unrealized net gains (losses) on investment securities, tax	4	(35)
Net derivative (gains) losses-hedging activities, tax	(3)	14
Net realized gains on investment securities, tax		16
Net pension and other postretirement benefit costs, tax	(1)	(8)
Changes in other comprehensive income (loss) from equity method investees, tax		(1)
Virginia Electric and Power Company
Net deferred gains on derivative-hedging activities, tax	(2)
Changes in unrealized net gains (losses) on investment securities, tax	1	(4)
Net realized gains on investment securities, tax		2
Dominion Energy Gas Holdings, LLC
Net deferred gains on derivative-hedging activities, tax	(4)	7
Net derivative (gains) losses-hedging activities, tax	1	(7)
Net pension and other postretirement benefit costs, tax	$ (1)	$ (1)