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Operating Segments (Narrative) (Detail) - Operating Segments - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Segment Reporting Information [Line Items] |  |  |
After- tax net (expenses) benefit | $ (218) |  |
Virginia Electric and Power Company |  |  |
Segment Reporting Information [Line Items] |  |  |
After- tax net (expenses) benefit | (189) |  |
Storm damage and service restoration costs associated with winter storm riley | 31 |  |
Storm damage and service restoration costs associated with winter storm riley, after tax | 23 |  |
Virginia Regulation |  |  |
Segment Reporting Information [Line Items] |  |  |
Charge associated with legislation enacted | 215 |  |
Charge associated with legislation enacted, after tax | 160 |  |
Virginia Regulation | Virginia Electric and Power Company |  |  |
Segment Reporting Information [Line Items] |  |  |
Charge associated with legislation enacted | 215 |  |
Charge associated with legislation enacted, after tax | 160 |  |
Decommissioning Trust Fund |  |  |
Segment Reporting Information [Line Items] |  |  |
Loss on investments held in nuclear decommissioning trust funds | 43 |  |
Loss on investments held in nuclear decommissioning trust funds, after tax | 32 |  |
Net gain on investments held in nuclear decommissioning trust funds |  |  | $ 34
Net gain on investments held in nuclear decommissioning trust funds, after tax |  |  | $ 21
Corporate and Other |  |  |
Segment Reporting Information [Line Items] |  |  |
After- tax net (expenses) benefit | (238) | $ 21 |
Corporate and Other | Virginia Electric and Power Company |  |  |
Segment Reporting Information [Line Items] |  |  |
After- tax net (expenses) benefit | (197) | 2 |
Corporate and Other | Dominion Energy Gas Holdings, LLC |  |  |
Segment Reporting Information [Line Items] |  |  |
After- tax net (expenses) benefit | 0 | $ 0 |
Power Generation | Virginia Regulation |  |  |
Segment Reporting Information [Line Items] |  |  |
Charge associated with legislation enacted, after tax | 109 |  |
Power Generation | Virginia Regulation | Virginia Electric and Power Company |  |  |
Segment Reporting Information [Line Items] |  |  |
Charge associated with legislation enacted, after tax | 109 |  |
Power Delivery | Virginia Regulation |  |  |
Segment Reporting Information [Line Items] |  |  |
Charge associated with legislation enacted, after tax | 51 |  |
Power Delivery | Virginia Regulation | Virginia Electric and Power Company |  |  |
Segment Reporting Information [Line Items] |  |  |
Charge associated with legislation enacted, after tax | $ 51 |  |

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