Shareholders' Equity (Accumulated Other Comprehensive Income (Loss)) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Net unrealized gains on derivatives-hedging activities, net of tax of $48 and $(27)	$ (54)
Total AOCI	(610)	(330)
Net unrealized gains (losses) on derivatives-hedging activities, tax	48	(27)
Net unrealized gains (losses) on nuclear decommissioning trust funds, tax	(142)	(142)
Net unrecognized pension and other postretirement benefit costs, tax	446	446
Dominion [Member]
Net unrealized gains on derivatives-hedging activities, net of tax of $48 and $(27)	(54)	51
Net unrealized gains on nuclear decommissioning trust funds, net of tax of $(142) and $(142)	243	226
Net unrecognized pension and other postretirement benefit costs, net of tax of $446 and $446	$ 799	$ 607