Consolidated Statements of Comprehensive Income (Parenthetical) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Net deferred gains (losses) on derivative-hedging activities, tax	$ 80	$ 54
Changes in unrealized net gains (losses) on investment securities, tax	(1)	(51)
Changes in unrecognized pension and other postretirement benefit costs, tax	(4)	0
Net derivative (gains) losses-hedging activities, tax	(100)	(48)
Net realized (gains) losses on investment securities, tax	7	18
Net pension and other postretirement benefit costs, tax	(6)	(9)
Virginia Electric and Power Company
Net deferred gains (losses) on derivative-hedging activities, tax	(1)	(1)
Changes in unrealized net gains (losses) on investment securities, tax	(2)	(5)
Net derivative (gains) losses-hedging activities, tax	2	0
Net realized (gains) losses on investment securities, tax	$ 1	$ 1