Operating Segments (Narrative) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Segment Reporting Information [Line Items]
Amount of expense			$ 0	$ 330,000,000
After tax net expense	$ 1,848,000,000	$ 2,129,000,000	6,229,000,000	7,410,000,000
Operating Segments
Segment Reporting Information [Line Items]
After tax net expenses			80,000,000	435,000,000
Operating Segments | Corporate and Other
Segment Reporting Information [Line Items]
After tax net expenses			82,000,000	446,000,000
Operating Segments | Dominion Generation
Segment Reporting Information [Line Items]
Net gain on investments			39,000,000	53,000,000
Net gain on investments, after tax			25,000,000	33,000,000
Loss related to restructuring of producer services				47,000,000
Restructuring after tax				33,000,000
Net loss				147,000,000
After tax net loss				90,000,000
Net gain (loss) on sale				100,000,000
Net gain (loss) on sale, after tax				57,000,000
Write off of goodwill				31,000,000
Operating Segments | Dominion Generation | Virginia legislation
Segment Reporting Information [Line Items]
Amount of expense				330,000,000
Amount of expense, after tax				219,000,000
Operating Segments | Dominion Generation | PJM
Segment Reporting Information [Line Items]
Billing adjustment			17,000,000
Billing adjustment, net of tax			10,000,000
Operating Segments | Dominion Generation | Facilities Subject to CCR Final Rule
Segment Reporting Information [Line Items]
Charge related to incremental future ash pond and landfill closure costs			45,000,000
Charge related to incremental future ash pond and landfill closure costs, net of tax			28,000,000
Operating Segments | Dominion Generation | Implementation of Depreciation Study Ordered by Virginia Commission | Virginia legislation
Segment Reporting Information [Line Items]
One-time charge related to implementation of depreciation study				38,000,000
One-time charge related to implementation of depreciation study, net of tax				23,000,000
Operating Segments | Dominion Generation | Virginia Regulation | Deferred Fuel Costs
Segment Reporting Information [Line Items]
Write off of deferred fuel balances			85,000,000
Write off of deferred fuel balances, net of tax			52,000,000
Operating Segments | Dominion Energy | Virginia legislation
Segment Reporting Information [Line Items]
Amount of expense				319,000,000
Amount of expense, after tax				193,000,000
Virginia Electric and Power Company
Segment Reporting Information [Line Items]
Amount of expense			0	330,000,000
After tax net expense	1,317,000,000	1,459,000,000	4,261,000,000	4,353,000,000
Virginia Electric and Power Company | Operating Segments
Segment Reporting Information [Line Items]
After tax net expenses				239,000,000
Virginia Electric and Power Company | Operating Segments | Corporate and Other
Segment Reporting Information [Line Items]
After tax net expenses				235,000,000
After tax net expense			101,000,000
Virginia Electric and Power Company | Operating Segments | Dominion Generation | Virginia legislation
Segment Reporting Information [Line Items]
Amount of expense				330,000,000
Amount of expense, after tax				219,000,000
Virginia Electric and Power Company | Operating Segments | Dominion Generation | PJM
Segment Reporting Information [Line Items]
Billing adjustment			15,000,000
Billing adjustment, net of tax			9,000,000
Virginia Electric and Power Company | Operating Segments | Dominion Generation | Facilities Subject to CCR Final Rule
Segment Reporting Information [Line Items]
Charge related to incremental future ash pond and landfill closure costs			45,000,000
Charge related to incremental future ash pond and landfill closure costs, net of tax			28,000,000
Virginia Electric and Power Company | Operating Segments | Dominion Generation | Implementation of Depreciation Study Ordered by Virginia Commission | Virginia legislation
Segment Reporting Information [Line Items]
One-time charge related to implementation of depreciation study				38,000,000
One-time charge related to implementation of depreciation study, net of tax				23,000,000
Virginia Electric and Power Company | Operating Segments | Dominion Generation | Virginia Regulation | Deferred Fuel Costs
Segment Reporting Information [Line Items]
Write off of deferred fuel balances			85,000,000
Write off of deferred fuel balances, net of tax			52,000,000
Dominion Gas Holdings, LLC
Segment Reporting Information [Line Items]
After tax net expense	$ 163,000,000	$ 214,000,000	665,000,000	792,000,000
Dominion Gas Holdings, LLC | Operating Segments | Corporate and Other
Segment Reporting Information [Line Items]
After tax net expenses			$ 0	$ 0