Consolidated Statements of Comprehensive Income (Parenthetical) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net deferred gains (losses) on derivatives-hedging activities, tax	$ (20)	$ 161	$ 5
Changes in unrealized net gains (losses) on investment securities, tax	(59)	(136)	(68)
Changes in net unrecognized pension and other postretirement benefit costs, tax	189	(341)	209
Net derivative (gains) losses-hedging activities, tax	(59)	(53)	34
Net realized (gains) losses on investment securities, tax	33	35	16
Net pension and other postretirement benefit costs, tax	(24)	(39)	(32)
Changes in other comprehensive income (loss) from equity method investees, tax	3	0	0
Virginia Electric and Power Company
Net deferred gains (losses) on derivatives-hedging activities, tax	2	(3)	3
Changes in unrealized net gains (losses) on investment securities, tax	(9)	(13)	(7)
Net derivative (gains) losses-hedging activities, tax	2	0	(2)
Net realized (gains) losses on investment securities, tax	4	2	2
Dominion Gas Holdings, LLC
Net deferred gains (losses) on derivatives-hedging activities, tax	19	(27)	(10)
Changes in net unrecognized pension and other postretirement benefit costs, tax	6	(18)	5
Net derivative (gains) losses-hedging activities, tax	(5)	(5)	(13)
Net pension and other postretirement benefit costs, tax	$ (3)	$ (4)	$ (4)