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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)

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