Derivatives and Hedge Accounting Activities (Gains and Losses on our Derivatives Not Designated as Hedging Instruments) (Details) (Fair Value - Derivatives not under Hedge Accounting [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Amount of Gain (Loss) Recognized in Income on Derivatives	$ 26	[1]	$ 40	[1]	$ (124)	[1]
Commodity Contract [Member] | Operating Revenue [Member]
Amount of Gain (Loss) Recognized in Income on Derivatives	111	[1]	67	[1]	105	[1]
Commodity Contract [Member] | Purchased Gas [Member]
Amount of Gain (Loss) Recognized in Income on Derivatives	(35)	[1]	(41)	[1]	(66)	[1]
Commodity Contract [Member] | Electric fuel and other energy-related purchases [Member]
Amount of Gain (Loss) Recognized in Income on Derivatives	(45)	[1]	51	[1]	(163)	[1]
Interest Rate Contract [Member]
Amount of Gain (Loss) Recognized in Income on Derivatives	$ (5)	[1],[2]	$ (37)	[1],[2]	$ 0	[1],[2]

[1] Includes derivative activity amortized out of regulatory assets/liabilities. Amounts deferred into regulatory assets/liabilities have no associated effect in Dominion's Consolidated Statements of Income.

[2] Amounts recorded in Dominion's Consolidated Statements of Income are classified in interest and related charges.