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Operating Segments (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
After-tax net expenses |  |  |  |  | $ 8,110 | $ 8,147 | $ 9,715
Charges associated with future ash pond and landfill closure costs |  |  |  |  | 197 | 99 | 121
Charge recognized |  |  |  |  | 0 | 0 | 374
Facilities Subject to Coal Combustion Residual Final Rule |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Charge related to future ash pond and landfill closure costs | $ 122 |  |  |  |  |  |
Virginia Electric and Power Company |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
After-tax net expenses |  |  |  |  | 5,238 | 5,501 | 5,855
Charges associated with future ash pond and landfill closure costs |  |  |  |  | 197 | 99 | 121
Charge recognized |  |  |  |  | 0 | 0 | 374
Virginia Electric and Power Company | Virginia Regulation | Deferred Fuel Costs |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Write off of deferred fuel cost, net of tax |  |  |  | $ 52 |  |  |
Virginia Electric and Power Company | Facilities Subject to Coal Combustion Residual Final Rule |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Charge related to future ash pond and landfill closure costs | $ 121 | $ 32 | $ 28 |  |  |  |
Dominion Gas Holdings, LLC |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
After-tax net expenses |  |  |  |  | 969 | 927 | 1,047
Operating Segments | Organizational Design Initiative |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Organizational design initiative charges |  |  |  |  | 59 |  |
Organizational design initiative charges, after tax |  |  |  |  | 36 |  |
Operating Segments | Corporate and Other |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
After-tax net expenses |  |  |  |  | 484 | 391 | 970
Net expenses attributable to other operating segments |  |  |  |  | 180 | 136 | 544
Operating Segments | Dominion Generation |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Charges associated with future ash pond and landfill closure costs |  |  |  |  |  |  | 121
Charge related to future ash pond and landfill closure costs |  |  |  |  |  |  | 74
Operating Segments | Dominion Generation | Legislation enacted |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Charge recognized |  |  |  |  |  |  | 374
Charge recognized, net of tax |  |  |  |  |  |  | 248
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 | Organizational Design Initiative |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Organizational design initiative charges, after tax |  |  |  |  | 19 |  |
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 | DVP | Organizational Design Initiative |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Organizational design initiative charges, after tax |  |  |  |  | 5 |  |
Operating Segments | Dominion Energy | Legislation enacted |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Charge recognized |  |  |  |  |  |  | 319
Charge recognized, net of tax |  |  |  |  |  |  | 193
Operating Segments | Dominion Energy | Organizational Design Initiative |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Organizational design initiative charges, after tax |  |  |  |  | 12 |  |
Operating Segments | Virginia Electric and Power Company | Corporate and Other |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
After-tax net expenses |  |  |  |  | 173 | 153 | 342
Operating Segments | Virginia Electric and Power Company | Dominion Generation |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Charges associated with future ash pond and landfill closure costs |  |  |  |  |  |  | 121
Charge related to future ash pond and landfill closure costs |  |  |  |  |  |  | 74
Operating Segments | Virginia Electric and Power Company | Dominion Generation | Legislation enacted |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Charge recognized |  |  |  |  |  |  | 374
Charge recognized, net of tax |  |  |  |  |  |  | 248
Operating Segments | Virginia Electric and Power Company | 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 | Virginia Electric and Power Company | 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 |  |  |  |  | 121 | 60 |
Operating Segments | Dominion Gas Holdings, LLC |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Net expenses attributable to other operating segments |  |  |  |  | 7 | 13 |
Ceiling test impairment charge |  |  |  |  |  | 16 |
Ceiling test impairment charge, net of tax |  |  |  |  |  | 10 |
Operating Segments | Dominion Gas Holdings, LLC | Organizational Design Initiative |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Organizational design initiative charges |  |  |  |  | 8 |  |
Organizational design initiative charges, after tax |  |  |  |  | 5 |  |
Operating Segments | Dominion Gas Holdings, LLC | Corporate and Other |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Net expenses attributable to other operating segments |  |  |  |  | $ 3 | $ 21 | $ 9

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