Derivatives and Hedge Accounting Activities (Gains and Losses on our Derivatives in Cash Flow Hedging Relationships) (Details) (Cash Flow Hedges [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 AOCI on Derivatives (Effective Portion)	$ (115)	[1]	$ 136	[1]	$ 517	[1]
Amount of Gain (Loss) Reclassified from AOCI to Income	66		507		885
Increase (Decrease) in Derivatives Subject to Regulatory Treatment	(163)	[2]	(46)	[2]	90	[2]
Commodity Contract [Member]
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	137	[1]	139	[1]	358	[1]
Amount of Gain (Loss) Reclassified from AOCI to Income	74		397		887
Increase (Decrease) in Derivatives Subject to Regulatory Treatment	(20)	[2]	(17)	[2]	6	[2]
Commodity Contract [Member] | Operating Revenue [Member]
Amount of Gain (Loss) Reclassified from AOCI to Income	153		557		1,072
Commodity Contract [Member] | Purchased Gas [Member]
Amount of Gain (Loss) Reclassified from AOCI to Income	(78)		(155)		(179)
Commodity Contract [Member] | Electric fuel and other energy-related purchases [Member]
Amount of Gain (Loss) Reclassified from AOCI to Income	(2)		(8)		(10)
Commodity Contract [Member] | Purchased electric capacity [Member]
Amount of Gain (Loss) Reclassified from AOCI to Income	1		3		4
Interest Rate Contract [Member]
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	(252)	[1],[3]	(3)	[1],[3]	159	[1],[3]
Amount of Gain (Loss) Reclassified from AOCI to Income	(8)	[3]	109	[3]	(4)	[3]
Increase (Decrease) in Derivatives Subject to Regulatory Treatment	(143)	[2],[3]	(27)	[2],[3]	87	[2],[3]
Foreign Currency [Member]
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)			0	[1],[4]	0	[1],[4]
Amount of Gain (Loss) Reclassified from AOCI to Income			1	[4]	2	[4]
Increase (Decrease) in Derivatives Subject to Regulatory Treatment			$ (2)	[2],[4]	$ (3)	[2],[4]

[1] Amounts deferred into AOCI have no associated effect in Dominion's Consolidated Statements of Income.

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

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

[4] Amounts recorded in Dominion's Consolidated Statements of Income are classified in electric fuel and other energy-related purchases.