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Operating Segments (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2017 | Jun. 30, 2016
Virginia Electric and Power Company |  |  |
Segment Reporting Information [Line Items] |  |  |
Proposed customer settlement | $ 16 |  |
Proposed customer settlement, after tax | $ 10 |  |
Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
After- tax net expenses |  | $ (1) | $ (26)
Operating Segments | Dominion Energy Gas Holdings, LLC |  |  |
Segment Reporting Information [Line Items] |  |  |
Write off of regulatory asset |  | 15 |
Write off of regulatory asset, after tax |  | 9 |
Operating Segments | Organizational Design Initiative |  |  |
Segment Reporting Information [Line Items] |  |  |
Organizational design initiative |  |  | 59
Organizational design initiative, after tax |  |  | 36
Operating Segments | Organizational Design Initiative | Virginia Electric and Power Company |  |  |
Segment Reporting Information [Line Items] |  |  |
Organizational design initiative |  |  | 33
Organizational design initiative, after tax |  |  | 20
Operating Segments | Organizational Design Initiative | Dominion Energy Gas Holdings, LLC |  |  |
Segment Reporting Information [Line Items] |  |  |
Organizational design initiative |  |  | 8
Organizational design initiative, after tax |  |  | 5
Operating Segments | Corporate and Other |  |  |
Segment Reporting Information [Line Items] |  |  |
After- tax net expenses |  | (10) | (37)
Operating Segments | Corporate and Other | Virginia Electric and Power Company |  |  |
Segment Reporting Information [Line Items] |  |  |
After- tax net expenses |  | (7) | (19)
Operating Segments | Corporate and Other | Dominion Energy Gas Holdings, LLC |  |  |
Segment Reporting Information [Line Items] |  |  |
After- tax net expenses |  | (9) | (2)
Operating Segments | Power Delivery | Virginia Electric and Power Company |  |  |
Segment Reporting Information [Line Items] |  |  |
Proposed customer settlement |  | 16 |
Proposed customer settlement, after tax |  | $ 10 |
Operating Segments | Power Delivery | Organizational Design Initiative |  |  |
Segment Reporting Information [Line Items] |  |  |
Organizational design initiative, after tax |  |  | 5
Operating Segments | Power Delivery | Organizational Design Initiative | Virginia Electric and Power Company |  |  |
Segment Reporting Information [Line Items] |  |  |
Organizational design initiative, after tax |  |  | 5
Operating Segments | Gas Infrastructure | Organizational Design Initiative |  |  |
Segment Reporting Information [Line Items] |  |  |
Organizational design initiative, after tax |  |  | 12
Operating Segments | Power Generation | Organizational Design Initiative |  |  |
Segment Reporting Information [Line Items] |  |  |
Organizational design initiative, after tax |  |  | 19
Operating Segments | Power Generation | Organizational Design Initiative | Virginia Electric and Power Company |  |  |
Segment Reporting Information [Line Items] |  |  |
Organizational design initiative, after tax |  |  | $ 15

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