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Quarterly Financial and Common Stock Data (Unaudited) (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015
Facilities Subject to Coal Combustion Residual Final Rule |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |
Charge related to future ash pond and landfill closure costs | $ 122 |  |  |  |
Virginia Electric and Power Company | Deferred Fuel Costs | Virginia Regulation |  |  |  |  |
Condensed Financial Statements, Captions [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 |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |
Charge related to future ash pond and landfill closure costs | $ 121 | $ 32 |  | $ 28 |
Dominion Gas Holdings, LLC | Oil and Gas Properties |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |
After tax gain on sale |  |  | $ 29 |  | $ 43

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