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, 2014		Dec. 31, 2013		Dec. 31, 2012
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	$ 37	[1]	$ (404)	[1]	$ (13)	[1]
Amount of Gain (Loss) Reclassified from AOCI to Income	(152)		(130)		94
Increase (Decrease) in Derivatives Subject to Regulatory Treatment	(85)	[2]	86	[2]	(25)	[2]
Commodity
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	245	[1]	(481)	[1]	71	[1]
Amount of Gain (Loss) Reclassified from AOCI to Income	(136)		(115)		96
Increase (Decrease) in Derivatives Subject to Regulatory Treatment	(4)	[2]	5	[2]	10	[2]
Commodity | Operating Revenue
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Reclassified from AOCI to Income	(130)		(58)		188
Commodity | Purchased gas
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Reclassified from AOCI to Income	(13)		(47)		(75)
Commodity | Electric fuel and other energy-related purchases
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Reclassified from AOCI to Income	7		(10)		(17)
Interest rate
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	(208)	[1],[3]	77	[1],[3]	(84)	[1],[3]
Amount of Gain (Loss) Reclassified from AOCI to Income	(16)	[3]	(15)	[3]	(2)	[3]
Increase (Decrease) in Derivatives Subject to Regulatory Treatment	(81)	[2],[3]	81	[2],[3]	(35)	[2],[3]
Virginia Electric and Power Company
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	(6)	[4]	9	[4]	(8)	[4]
Amount of Gain (Loss) Reclassified from AOCI to Income	5		0		(4)
Increase (Decrease) in Derivatives Subject to Regulatory Treatment	(85)	[5]	86	[5]	(25)	[5]
Virginia Electric and Power Company | Commodity
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	4	[4]	0	[4]	(2)	[4]
Amount of Gain (Loss) Reclassified from AOCI to Income	5		0		(4)
Increase (Decrease) in Derivatives Subject to Regulatory Treatment	(4)	[5]	5	[5]	10	[5]
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	5		0		(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)	(10)	[4],[6]	9	[4],[6]	(6)	[4],[6]
Amount of Gain (Loss) Reclassified from AOCI to Income	0	[6]	0	[6]	0	[6]
Increase (Decrease) in Derivatives Subject to Regulatory Treatment	(81)	[5],[6]	81	[5],[6]	(35)	[5],[6]
Dominion Gas Holdings, LLC
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	(50)	[7]	66	[7]	23	[7]
Amount of Gain (Loss) Reclassified from AOCI to Income	(13)		(16)		(33)
Dominion Gas Holdings, LLC | Commodity
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	12	[7]	(2)	[7]	64	[7]
Amount of Gain (Loss) Reclassified from AOCI to Income	(12)		(16)		(33)
Dominion Gas Holdings, LLC | Commodity | Operating Revenue
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Reclassified from AOCI to Income	2		(2)		(15)
Dominion Gas Holdings, LLC | Commodity | Purchased gas
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Reclassified from AOCI to Income	(14)		(14)		(18)
Dominion Gas Holdings, LLC | Interest rate
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	(62)	[7],[8]	68	[7],[8]	(41)	[7],[8]
Amount of Gain (Loss) Reclassified from AOCI to Income	$ (1)	[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.