Derivatives and Hedge Accounting Activities (Gains and Losses on Derivatives in Cash Flow Hedging Relationships) (Details) - Cash Flow Hedges - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	[1]	$ 151	$ (106)	$ 53	$ (335)
Amount of Gain (Loss) Reclassified from AOCI to Income		102	22	4	(238)
Increase (Decrease) in Derivatives Subject to Regulatory Treatment	[2]	91	(12)	45	(33)
Commodity
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	[1]	94	(33)	54	(216)
Amount of Gain (Loss) Reclassified from AOCI to Income		105	25	9	(232)
Increase (Decrease) in Derivatives Subject to Regulatory Treatment	[2]	0	(4)	3	(2)
Commodity | Operating revenue
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Reclassified from AOCI to Income		107	28	15	(241)
Commodity | Purchased Gas
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Reclassified from AOCI to Income		(2)	(3)	(7)	(4)
Commodity | Electric fuel and other energy-related purchases
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Reclassified from AOCI to Income				1	13
Interest rate
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	[1],[3]	57	(73)	(1)	(119)
Amount of Gain (Loss) Reclassified from AOCI to Income	[3]	(3)	(3)	(5)	(6)
Increase (Decrease) in Derivatives Subject to Regulatory Treatment	[2],[3]	91	(8)	42	(31)
Virginia Electric and Power Company
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	[4]	11	(1)	5	1
Amount of Gain (Loss) Reclassified from AOCI to Income		0	1	(1)	6
Increase (Decrease) in Derivatives Subject to Regulatory Treatment	[5]	91	(12)	45	(33)
Virginia Electric and Power Company | Commodity
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	[4]	0	0	0	5
Amount of Gain (Loss) Reclassified from AOCI to Income		0	1	(1)	6
Increase (Decrease) in Derivatives Subject to Regulatory Treatment	[5]	0	(4)	3	(2)
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		0	1	(1)	6
Virginia Electric and Power Company | Interest rate
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	[4],[6]	11	(1)	5	(4)
Amount of Gain (Loss) Reclassified from AOCI to Income	[6]	0	0	0	0
Increase (Decrease) in Derivatives Subject to Regulatory Treatment	[5],[6]	91	(8)	42	(31)
Dominion Gas Holdings, LLC
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	[7]	4	(31)	(2)	(44)
Amount of Gain (Loss) Reclassified from AOCI to Income		1	(5)	1	(12)
Dominion Gas Holdings, LLC | Commodity
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	[7]	0	(3)	(2)	(2)
Amount of Gain (Loss) Reclassified from AOCI to Income		1	(5)	1	(12)
Dominion Gas Holdings, LLC | Commodity | Operating revenue
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Reclassified from AOCI to Income		1	(2)	$ 1	(7)
Dominion Gas Holdings, LLC | Commodity | Purchased Gas
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Reclassified from AOCI to Income			(3)		(5)
Dominion Gas Holdings, LLC | Interest rate
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	[7],[8]	4	(28)		(42)
Amount of Gain (Loss) Reclassified from AOCI to Income	[8]	$ 0	$ 0		$ 0

[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.