Operating Segments (Narrative) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Segment Reporting Information [Line Items]
After tax net expense	$ 2,039,000,000	$ 2,407,000,000
Operating Segments
Segment Reporting Information [Line Items]
After tax net expenses	38,000,000	45,000,000
Operating Segments | Organizational Design Initiative
Segment Reporting Information [Line Items]
Organizational design initiative	66,000,000
Organizational design initiative, after tax	41,000,000
Operating Segments | Corporate and Other
Segment Reporting Information [Line Items]
After tax net expenses	48,000,000	48,000,000
Operating Segments | DVP | Organizational Design Initiative
Segment Reporting Information [Line Items]
Organizational design initiative, after tax	6,000,000
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	27,000,000
Net gain on investments, after tax	17,000,000
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 | 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	23,000,000
Virginia Electric and Power Company
Segment Reporting Information [Line Items]
After tax net expense	1,376,000,000	1,612,000,000
Virginia Electric and Power Company | Operating Segments
Segment Reporting Information [Line Items]
After tax net expense	25,000,000
Virginia Electric and Power Company | Operating Segments | Organizational Design Initiative
Segment Reporting Information [Line Items]
Organizational design initiative	40,000,000
Organizational design initiative, after tax	25,000,000
Virginia Electric and Power Company | Operating Segments | Corporate and Other
Segment Reporting Information [Line Items]
After tax net expenses		61,000,000
After tax net expense	26,000,000
Virginia Electric and Power Company | Operating Segments | DVP | Organizational Design Initiative
Segment Reporting Information [Line Items]
Organizational design initiative, after tax	6,000,000
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 | 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	19,000,000
Dominion Gas Holdings, LLC
Segment Reporting Information [Line Items]
After tax net expense	256,000,000	260,000,000
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