Consolidated Statements of Comprehensive Income (Unaudited) (Parenthetical) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Net deferred gains (losses) on derivative-hedging activities, tax	$ (8)	$ 0	$ (34)	$ (20)
Changes in unrealized net gains (losses) on investment securities, tax	(18)	55	(43)	50
Changes in unrecognized pension and other postretirement benefit costs, tax	(10)	(9)	(10)	(6)
Net derivative (gains) losses-hedging activities, tax	21	30	88	34
Net realized gains on investment securities, tax	7	0	13	20
Net pension and other postretirement benefit costs, tax	(4)	(7)	(16)	(25)
Changes in other comprehensive income (loss) from equity method investees, tax	0	(1)	0	0
Virginia Electric and Power Company
Net deferred gains (losses) on derivative-hedging activities, tax	1	3	10	1
Changes in unrealized net gains (losses) on investment securities, tax	(2)	5	(6)	5
Net derivative (gains) losses-hedging activities, tax	0	0	(1)	0
Net realized gains on investment securities, tax	1	2	2	3
Dominion Gas Holdings, LLC
Net deferred gains (losses) on derivative-hedging activities, tax	(3)	(1)	5	0
Net derivative (gains) losses-hedging activities, tax	2	1	2	1
Net pension and other postretirement benefit costs, tax	$ (1)	$ (1)	$ (2)	$ (3)