Derivatives and Hedge Accounting Activities (Gains and Losses on Derivatives in Cash Flow Hedging Relationships) (Details) (Cash Flow Hedges, USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012		Mar. 31, 2011
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	$ 208	[1]	$ (143)	[1]
Amount of Gain (Loss) Reclassified from AOCI to Income	28		(18)
Increase (Decrease) in Derivatives Subject to Regulatory Treatment	26	[2]	(6)	[2]
Commodity Contract [Member]
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	176	[1]	(142)	[1]
Amount of Gain (Loss) Reclassified from AOCI to Income	27		(18)
Increase (Decrease) in Derivatives Subject to Regulatory Treatment	(1)	[2]	(5)	[2]
Commodity Contract [Member] | Operating Revenue [Member]
Amount of Gain (Loss) Reclassified from AOCI to Income	64		28
Commodity Contract [Member] | Purchased Gas [Member]
Amount of Gain (Loss) Reclassified from AOCI to Income	(30)		(48)
Commodity Contract [Member] | Electric Fuel and Other Energy-Related Purchases
Amount of Gain (Loss) Reclassified from AOCI to Income	(7)		1
Commodity Contract [Member] | Purchased Electric Capacity
Amount of Gain (Loss) Reclassified from AOCI to Income			1
Interest Rate Contract [Member]
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	32	[1],[3]	(1)	[1],[3]
Amount of Gain (Loss) Reclassified from AOCI to Income	1	[3]	0	[3]
Increase (Decrease) in Derivatives Subject to Regulatory Treatment	$ 27	[2],[3]	$ (1)	[2],[3]

[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.