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				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	$ (94)	[1]	$ (120)	[1]	$ (430)	[1]	$ (66)	[1]
Amount of Gain (Loss) Reclassified from AOCI to Income	53		10		(185)		(88)
Increase (Decrease) in Derivatives Subject to Regulatory Treatment	(7)	[2]	18	[2]	(39)	[2]	69	[2]
Commodity
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	(74)	[1]	(110)	[1]	(291)	[1]	(137)	[1]
Amount of Gain (Loss) Reclassified from AOCI to Income	58		16		(174)		(76)
Increase (Decrease) in Derivatives Subject to Regulatory Treatment	0	[2]	4	[2]	(1)	[2]	3	[2]
Commodity | Operating revenue
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Reclassified from AOCI to Income	66		24		(175)		(31)
Commodity | Purchased gas
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Reclassified from AOCI to Income	(3)		(5)		(7)		(39)
Commodity | Electric fuel and other energy-related purchases
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Reclassified from AOCI to Income	(5)		(3)		8		(6)
Interest rate
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	(20)	[1],[3]	(10)	[1],[3]	(139)	[1],[3]	71	[1],[3]
Amount of Gain (Loss) Reclassified from AOCI to Income	(5)	[3]	(6)	[3]	(11)	[3]	(12)	[3]
Increase (Decrease) in Derivatives Subject to Regulatory Treatment	(7)	[2],[3]	14	[2],[3]	(38)	[2],[3]	66	[2],[3]
Virginia Electric and Power Company
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	(1)	[4]	2	[4]	0	[4]	7	[4]
Amount of Gain (Loss) Reclassified from AOCI to Income	(1)		(1)		5		0
Increase (Decrease) in Derivatives Subject to Regulatory Treatment	(7)	[5]	18	[5]	(39)	[5]	69	[5]
Virginia Electric and Power Company | Commodity
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	(1)	[4]	1	[4]	5	[4]	0	[4]
Amount of Gain (Loss) Reclassified from AOCI to Income	(1)		(1)		5		0
Increase (Decrease) in Derivatives Subject to Regulatory Treatment	0	[5]	4	[5]	(1)	[5]	3	[5]
Virginia Electric and Power Company | Commodity | Electric fuel and other energy-related purchases
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Reclassified from AOCI to Income	(1)		(1)		5		0
Virginia Electric and Power Company | Interest rate
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	0	[4],[6]	1	[4],[6]	(5)	[4],[6]	7	[4],[6]
Amount of Gain (Loss) Reclassified from AOCI to Income	0	[6]	0	[6]	0	[6]	0	[6]
Increase (Decrease) in Derivatives Subject to Regulatory Treatment	(7)	[5],[6]	14	[5],[6]	(38)	[5],[6]	66	[5],[6]
Dominion Gas Holdings, LLC
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	(11)	[7]	(34)	[7]	(55)	[7]	75	[7]
Amount of Gain (Loss) Reclassified from AOCI to Income	(6)		(5)		(18)		(9)
Dominion Gas Holdings, LLC | Commodity
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	3	[7]	(23)	[7]	1	[7]	11	[7]
Amount of Gain (Loss) Reclassified from AOCI to Income	(6)		(5)		(18)		(9)
Dominion Gas Holdings, LLC | Commodity | Operating revenue
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Reclassified from AOCI to Income	(1)		(1)		(8)		1
Dominion Gas Holdings, LLC | Commodity | Purchased gas
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Reclassified from AOCI to Income	(5)		(4)		(10)		(10)
Dominion Gas Holdings, LLC | Interest rate
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	(14)	[7],[8]	(11)	[7],[8]	(56)	[7],[8]	64	[7],[8]
Amount of Gain (Loss) Reclassified from AOCI to Income	$ 0	[8]	$ 0	[8]	$ 0	[8]	$ 0	[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 deferred into AOCI have no associated effect in Virginia Power’s Consolidated Statements of Income.

[5] 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.

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

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

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