Operating Segments (Narrative) (Details) - Operating Segments - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Segment Reporting Information [Line Items]
After- tax net income (expense)		$ (38,000,000)
Organizational Design Initiative
Segment Reporting Information [Line Items]
Organizational design initiative		66,000,000
Organizational design initiative, after tax		41,000,000
Corporate and Other
Segment Reporting Information [Line Items]
After- tax net income (expense)	$ 21,000,000	(48,000,000)
Dominion Generation | Organizational Design Initiative
Segment Reporting Information [Line Items]
Organizational design initiative, after tax		23,000,000
Dominion Generation | Decommissioning Trust Fund
Segment Reporting Information [Line Items]
Net gain on investments held in nuclear decommissioning trust funds	34,000,000
Net gain on investments held in nuclear decommissioning trust funds, after tax	21,000,000
DVP | Organizational Design Initiative
Segment Reporting Information [Line Items]
Organizational design initiative, after tax		6,000,000
Dominion Energy | Organizational Design Initiative
Segment Reporting Information [Line Items]
Organizational design initiative, after tax		12,000,000
Virginia Electric and Power Company
Segment Reporting Information [Line Items]
After- tax net income (expense)		(25,000,000)
Virginia Electric and Power Company | 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 | Corporate and Other
Segment Reporting Information [Line Items]
After- tax net income (expense)	2,000,000	(26,000,000)
Virginia Electric and Power Company | Dominion Generation | Organizational Design Initiative
Segment Reporting Information [Line Items]
Organizational design initiative, after tax	19,000,000
Virginia Electric and Power Company | DVP | Organizational Design Initiative
Segment Reporting Information [Line Items]
Organizational design initiative, after tax	6,000,000
Dominion Gas Holdings, LLC | 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 | Corporate and Other
Segment Reporting Information [Line Items]
After- tax net income (expense)	$ 0	$ (2,000,000)