Derivatives and Hedge Accounting Activities (Schedule of Derivatives not Designated as Hedging Instruments) (Details) (Fair Value - Derivatives not under Hedge Accounting, USD $) In Millions, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2012		Jun. 30, 2011		Jun. 30, 2012		Jun. 30, 2011
Amount of Gain (Loss) Recognized in Income on Derivatives	$ 39	[1]	$ (8)	[1]	$ 69	[1]	$ 16	[1]
Interest Rate Contract
Amount of Gain (Loss) Recognized in Income on Derivatives	9	[1],[2]	0	[1],[2]
Commodity Contract | Operating revenue
Amount of Gain (Loss) Recognized in Income on Derivatives	34	[1]	23	[1]	103	[1]	42	[1]
Commodity Contract | Purchased Gas
Amount of Gain (Loss) Recognized in Income on Derivatives	5	[1]	(7)	[1]	(5)	[1]	(18)	[1]
Commodity Contract | Electric fuel and other energy related purchases
Amount of Gain (Loss) Recognized in Income on Derivatives	(9)	[1]	(24)	[1]	(36)	[1]	(8)	[1]
Interest Rate Contract | Interest Rate Contract
Amount of Gain (Loss) Recognized in Income on Derivatives					7	[1],[2]	0	[1],[2]
Virginia Electric and Power Company
Amount of Gain (Loss) Recognized in Income on Derivatives	(18)	[3]	(24)	[3]	(47)	[3]	(8)	[3]
Virginia Electric and Power Company | Interest Rate Contract
Amount of Gain (Loss) Recognized in Income on Derivatives	1	[3],[4]	0	[3],[4]	(1)	[3],[4]	0	[3],[4]
Virginia Electric and Power Company | Commodity Contract
Amount of Gain (Loss) Recognized in Income on Derivatives	$ (19)	[3],[5]	$ (24)	[3],[5]	$ (46)	[3],[5]	$ (8)	[3],[5]

[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.

[3] Includes derivative activity amortized out of regulatory assets/liabilities. Amounts deferred into regulatory assets/liabilities have no associated effect in Virginia Power’s Consolidated Statements of Income.

[4] Amounts are recorded in interest and related charges in Virginia Power’s Consolidated Statements of Income.

[5] Amounts are recorded in electric fuel and other energy-related purchases in Virginia Power’s Consolidated Statements of Income.