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Operating Segments (Narrative) (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |  |  |
Tax benefit resulting from remeasurement of deferred income taxes as a result of the 2017 Tax Reform Act | $ (851) |  | $ (851) |  |
Charges associated with equity method investments in wind-powered generation facilities |  |  | 158 |  |
Charges associated with equity method investments in wind-powered generation facilities, after tax | 96 |  |  |  |
Charges associated with future ash pond and landfill closure costs |  |  |  | $ 197 | $ 99
Virginia Electric and Power Company |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Tax benefit resulting from remeasurement of deferred income taxes as a result of the 2017 Tax Reform Act | (93) |  | (93) |  |
Charges associated with future ash pond and landfill closure costs |  |  |  | 197 | 99
Dominion Energy Gas Holdings, LLC |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Tax benefit resulting from remeasurement of deferred income taxes as a result of the 2017 Tax Reform Act | $ (197) |  | (197) |  |
Facilities Subject to Coal Combustion Residual Final Rule |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Charge related to future ash pond and landfill closure costs |  | $ 122 |  |  |
Facilities Subject to Coal Combustion Residual Final Rule | Virginia Electric and Power Company |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Charge related to future ash pond and landfill closure costs |  | $ 121 |  |  |
Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
After-tax net (expenses) benefit |  |  | 861 | (180) | (136)
Tax benefit resulting from remeasurement of deferred income taxes as a result of the 2017 Tax Reform Act |  |  | 979 |  |
Charges associated with equity method investments in wind-powered generation facilities |  |  | 158 |  |
Charges associated with equity method investments in wind-powered generation facilities, after tax |  |  | 96 |  |
Operating Segments | Virginia Electric and Power Company |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Tax benefit resulting from remeasurement of deferred income taxes as a result of the 2017 Tax Reform Act |  |  | 93 |  |
Operating Segments | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
After-tax net (expenses) benefit |  |  | (174) | (7) | (13)
Tax benefit resulting from remeasurement of deferred income taxes as a result of the 2017 Tax Reform Act |  |  | 185 |  |
Ceiling test impairment charge |  |  |  |  | 16
Ceiling test impairment charge, net of tax |  |  |  |  | 10
Operating Segments | Organizational Design Initiative |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Organizational design initiative charges, after tax |  |  |  | 36 |
Organizational design initiative |  |  |  | 59 |
Operating Segments | Organizational Design Initiative | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Organizational design initiative charges, after tax |  |  |  | 5 |
Organizational design initiative |  |  |  | 8 |
Operating Segments | Corporate and Other |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
After-tax net (expenses) benefit |  |  | 389 | (484) | (391)
Operating Segments | Corporate and Other | Virginia Electric and Power Company |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
After-tax net (expenses) benefit |  |  | 74 | (173) | (153)
Operating Segments | Corporate and Other | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
After-tax net (expenses) benefit |  |  | (179) | (3) | (21)
Operating Segments | Dominion Generation | Virginia Regulation | Deferred Fuel Costs |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Write offs of deferred fuel costs |  |  |  |  | 85
Write off of deferred fuel cost, net of tax |  |  |  |  | 52
Operating Segments | Dominion Generation | Virginia Regulation | Deferred Fuel Costs | Virginia Electric and Power Company |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Write offs of deferred fuel costs |  |  |  |  | 85
Write off of deferred fuel cost, net of tax |  |  |  |  | 52
Operating Segments | Dominion Generation | Facilities Subject to Coal Combustion Residual Final Rule |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Charges associated with future ash pond and landfill closure costs |  |  |  | 197 | 99
Charge related to future ash pond and landfill closure costs |  |  |  | 122 | 60
Operating Segments | Dominion Generation | Facilities Subject to Coal Combustion Residual Final Rule | Virginia Electric and Power Company |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Charges associated with future ash pond and landfill closure costs |  |  |  | 197 | 99
Charge related to future ash pond and landfill closure costs |  |  |  | 121 | $ 60
Operating Segments | Gas Infrastructure | Organizational Design Initiative |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Organizational design initiative charges, after tax |  |  | 324 | 12 |
Operating Segments | Power Generation | Organizational Design Initiative |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Organizational design initiative charges, after tax |  |  | $ 655 | 19 |
Operating Segments | Power Delivery | Organizational Design Initiative |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Organizational design initiative charges, after tax |  |  |  | $ 5 |

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