Operating Segments (Narrative) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Segment Reporting Information [Line Items]
After tax net expense	$ 1,817,000,000	$ 1,974,000,000	$ 3,856,000,000	$ 4,381,000,000
Operating Segments
Segment Reporting Information [Line Items]
After tax net expenses			26,000,000	62,000,000
Operating Segments | Organizational Design Initiative
Segment Reporting Information [Line Items]
Organizational design initiative			59,000,000
Organizational design initiative, after tax			36,000,000
Operating Segments | Corporate and Other
Segment Reporting Information [Line Items]
After tax net expenses			37,000,000	64,000,000
Operating Segments | DVP | Organizational Design Initiative
Segment Reporting Information [Line Items]
Organizational design initiative, after tax			5,000,000
Operating Segments | Dominion Energy | Organizational Design Initiative
Segment Reporting Information [Line Items]
Organizational design initiative, after tax			12,000,000
Operating Segments | Dominion Generation
Segment Reporting Information [Line Items]
Net gain on investments				45,000,000
Net gain on investments, after tax				28,000,000
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, after tax				28,000,000
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 Generation | Organizational Design Initiative
Segment Reporting Information [Line Items]
Organizational design initiative, after tax			19,000,000
Virginia Electric and Power Company
Segment Reporting Information [Line Items]
After tax net expense	1,223,000,000	1,332,000,000	2,599,000,000	2,944,000,000
Virginia Electric and Power Company | Operating Segments | Organizational Design Initiative
Segment Reporting Information [Line Items]
Organizational design initiative			33,000,000
Organizational design initiative, after tax			20,000,000
Virginia Electric and Power Company | Operating Segments | Corporate and Other
Segment Reporting Information [Line Items]
After tax net expenses				87,000,000
After tax net expense			19,000,000
Virginia Electric and Power Company | Operating Segments | DVP | Organizational Design Initiative
Segment Reporting Information [Line Items]
Organizational design initiative, after tax			5,000,000
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, after tax				28,000,000
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
Virginia Electric and Power Company | Operating Segments | Dominion Generation | Organizational Design Initiative
Segment Reporting Information [Line Items]
Organizational design initiative, after tax			15,000,000
Dominion Gas Holdings, LLC
Segment Reporting Information [Line Items]
After tax net expense	$ 182,000,000	$ 242,000,000	438,000,000	502,000,000
Dominion Gas Holdings, LLC | Operating Segments | Organizational Design Initiative
Segment Reporting Information [Line Items]
Organizational design initiative			8,000,000
Organizational design initiative, after tax			5,000,000
Dominion Gas Holdings, LLC | Operating Segments | Corporate and Other
Segment Reporting Information [Line Items]
After tax net expenses				$ 0
After tax net expense			$ 2,000,000