Consolidated Statements of Comprehensive Income (Parenthetical) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Net deferred gains (losses) on derivative-hedging activities, tax	$ 43	$ 57	$ 21	$ (28)
Changes in unrealized net gains (losses) on investment securities, tax	(29)	(33)	(80)	(73)
Changes in unrecognized pension and other postretirement benefit costs, tax	(12)	(7)	(160)	(8)
Net derivative (gains) losses-hedging activities, tax	4	12	(35)	39
Net realized (gains) losses on investment securities, tax	5	3	28	12
Net pension and other postretirement benefit costs, tax	(9)	(6)	(29)	(23)
Virginia Electric and Power Company
Net deferred gains (losses) on derivative-hedging activities, tax	(1)	1	(3)	3
Changes in unrealized net gains (losses) on investment securities, tax	(2)	(4)	(7)	(7)
Net derivative (gains) losses-hedging activities, tax	0	0	0	(2)
Net realized (gains) losses on investment securities, tax	$ 0	$ 0	$ 1	$ 1