Derivatives and Hedge Accounting Activities (Schedule of Derivatives not Designated as Hedging Instruments) (Details) (Fair Value - Derivatives not under Hedge Accounting [Member], USD $) In Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2011		Sep. 30, 2010		Sep. 30, 2011		Sep. 30, 2010
Amount of Gain (Loss) Recognized in Income on Derivatives	$ (7)	[1]	$ 55	[1]	$ 8	[1]	$ 40	[1]
Commodity Contract [Member] | Operating Revenue [Member]
Amount of Gain (Loss) Recognized in Income on Derivatives	15	[1]	45	[1]	56	[1]	71	[1]
Commodity Contract [Member] | Electric Fuel and Other Energy-Related Purchases [Member]
Amount of Gain (Loss) Recognized in Income on Derivatives	(8)	[1]	23	[1]	(16)	[1]	48	[1]
Commodity Contract [Member] | Gas Purchases [Member]
Amount of Gain (Loss) Recognized in Income on Derivatives	(10)	[1]	(13)	[1]	(28)	[1]	(42)	[1]
Interest Rate Contract [Member] | Interest Rate Contract [Member]
Amount of Gain (Loss) Recognized in Income on Derivatives	$ (4)	[1],[2]	$ 0	[1],[2]	$ (4)	[1],[2]	$ (37)	[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.