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, 2013		Mar. 31, 2012
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	$ (144)	[1]	$ 208	[1]
Amount of Gain (Loss) Reclassified from AOCI to Income	(124)		28
Increase (Decrease) in Derivatives Subject to Regulatory Treatment	23	[2]	26	[2]
Commodity
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	(157)	[1]	176	[1]
Amount of Gain (Loss) Reclassified from AOCI to Income	(121)		27
Increase (Decrease) in Derivatives Subject to Regulatory Treatment	7	[2]	(1)	[2]
Commodity | Operating revenue
Amount of Gain (Loss) Reclassified from AOCI to Income	(84)		64
Commodity | Purchased gas
Amount of Gain (Loss) Reclassified from AOCI to Income	(34)		(30)
Commodity | Electric fuel and other energy-related purchases
Amount of Gain (Loss) Reclassified from AOCI to Income	(3)		(7)
Interest rate
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	13	[1]	32	[1],[3]
Amount of Gain (Loss) Reclassified from AOCI to Income	(3)		1	[3]
Increase (Decrease) in Derivatives Subject to Regulatory Treatment	$ 16	[2]	$ 27	[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.