Derivatives and Hedge Accounting Activities (Gains and Losses on our Derivatives in Cash Flow Hedging Relationships) (Details) (Cash Flow Hedges, USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	$ (13)	[1]	$ (115)	[1]	$ 136	[1]
Amount of Gain (Loss) Reclassified from AOCI to Income	94		66		507
Increase (Decrease) in Derivatives Subject to Regulatory Treatment	(25)	[2]	(163)	[2]	(46)	[2]
Commodity
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	71	[1]	137	[1]	139	[1]
Amount of Gain (Loss) Reclassified from AOCI to Income	96		74		397
Increase (Decrease) in Derivatives Subject to Regulatory Treatment	10	[2]	(20)	[2]	(17)	[2]
Commodity | Operating Revenue
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Reclassified from AOCI to Income	188		153		557
Commodity | Purchased gas
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Reclassified from AOCI to Income	(75)		(78)		(155)
Commodity | Electric fuel and other energy-related purchases
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Reclassified from AOCI to Income	(17)		(2)		(8)
Commodity | Purchased electric capacity
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Reclassified from AOCI to Income			1		3
Interest rate
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	(84)	[1],[3]	(252)	[1],[3]	(3)	[1],[3]
Amount of Gain (Loss) Reclassified from AOCI to Income	(2)	[3]	(8)	[3]	109	[3]
Increase (Decrease) in Derivatives Subject to Regulatory Treatment	(35)	[2],[3]	(143)	[2],[3]	(27)	[2],[3]
Foreign currency
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)					0	[1],[4]
Amount of Gain (Loss) Reclassified from AOCI to Income					1	[4]
Increase (Decrease) in Derivatives Subject to Regulatory Treatment					(2)	[2],[4]
Virginia Electric and Power Company
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	(8)	[5]	(9)	[5]	(2)	[5]
Amount of Gain (Loss) Reclassified from AOCI to Income	(4)		1		12
Increase (Decrease) in Derivatives Subject to Regulatory Treatment	(25)	[6]	(163)	[6]	(46)	[6]
Virginia Electric and Power Company | Commodity
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	(2)	[5]	(3)	[5]	(1)	[5]
Amount of Gain (Loss) Reclassified from AOCI to Income	(4)		0		3
Increase (Decrease) in Derivatives Subject to Regulatory Treatment	10	[6]	(20)	[6]	(17)	[6]
Virginia Electric and Power Company | Commodity | Electric Fuel and Energy Purchases
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Reclassified from AOCI to Income	(4)		(1)		(1)
Virginia Electric and Power Company | Commodity | Purchased electric capacity
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Reclassified from AOCI to Income			1		4
Virginia Electric and Power Company | Interest rate
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	(6)	[5],[7]	(6)	[5],[7]	(1)	[5],[7]
Amount of Gain (Loss) Reclassified from AOCI to Income	0	[7]	1	[7]	9	[7]
Increase (Decrease) in Derivatives Subject to Regulatory Treatment	(35)	[6],[7]	(143)	[6],[7]	(27)	[6],[7]
Virginia Electric and Power Company | Foreign currency
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)					0	[5],[8]
Amount of Gain (Loss) Reclassified from AOCI to Income					0	[8]
Increase (Decrease) in Derivatives Subject to Regulatory Treatment					$ (2)	[6],[8]

[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.

[5] Amounts deferred into AOCI have no associated effect in Virginia Power's Consolidated Statements of Income.

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

[7] Amounts recorded in Virginia Power's Consolidated Statements of Income are classified in interest and related charges.

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