Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Net deferred gains (losses) on derivative-hedging activities, tax	$ 0	$ 36	$ (20)	$ 163
Changes in unrealized net gains (losses) on investment securities, tax	55	(2)	50	(30)
Changes in unrecognized pension and other postretirement benefit costs, tax	(9)	0	(6)	0
Net derivative (gains) losses-hedging activities, tax	30	22	34	(72)
Net realized gains on investment securities, tax	0	13	20	24
Net pension and other postretirement benefit costs, tax	(7)	(6)	(25)	(18)
Changes in other comprehensive income (loss) from equity method investees, tax	(1)	0	0	3
Virginia Electric and Power Company
Net deferred gains (losses) on derivative-hedging activities, tax	3	0	1	0
Changes in unrealized net gains (losses) on investment securities, tax	5	(1)	5	(6)
Net derivative (gains) losses-hedging activities, tax	0	0	0	2
Net realized gains on investment securities, tax	2	2	3	3
Dominion Gas Holdings, LLC
Net deferred gains (losses) on derivative-hedging activities, tax	(1)	4	0	22
Net derivative (gains) losses-hedging activities, tax	1	(2)	1	(7)
Net pension and other postretirement benefit costs, tax	$ (1)	$ (1)	$ (3)	$ (2)