Consolidated Statements of Comprehensive Income (Parenthetical) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Net deferred gains (losses) on derivative-hedging activities, tax	$ (76)	$ (1)	$ (22)	$ (81)
Changes in unrealized net gains (losses) on investment securities, tax	0	16	(51)	(41)
Changes in unrecognized pension and other postretirement benefit costs, tax	(148)	(1)	(148)	(1)
Net derivative (gains) losses-hedging activities, tax	9	11	(39)	23
Net realized (gains) losses on investment securities, tax	5	3	23	10
Net pension and other postretirement benefit costs, tax	(11)	(8)	(20)	(17)
Virginia Electric and Power Company
Net deferred gains (losses) on derivative-hedging activities, tax	(1)	2	(2)	2
Changes in unrealized net gains (losses) on investment securities, tax	0	1	(5)	(5)
Net derivative (gains) losses-hedging activities, tax	0	0	0	(1)
Net realized (gains) losses on investment securities, tax	$ 0	$ 0	$ 1	$ 1