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Nature of Operations (Narrative) (Details) $ / shares in Units, $ in Millions |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2016 | Sep. 30, 2015 shares | Oct. 31, 2014 USD ($) shares | Dec. 31, 2016 segment | Oct. 20, 2014 $ / shares
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |
Number of operating segments |  |  |  | 3 |
Dominion Midstream Partners, LP | Limited Partner |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |
Percentage of limited partner interests in Dominion Midstream Partners, LP | 50.90% |  |  |  |
Dominion Midstream Partners, LP | Preferred Partner |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |
Percentage of limited partner interests in Dominion Midstream Partners, LP | 37.50% |  |  |  |
Dominion Midstream Partners, LP | IPO |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |
Net proceeds received from sale of units | $ |  |  | $ 392 |  |
Dominion Midstream Partners, LP | Iroquois | Partnership Interest |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |
Common units included in initial public offering | shares |  | 8,600,000 |  |  |
Noncontrolling partnership percentage interest | 25.93% |  |  | 25.93% |
Dominion Midstream Partners, LP | IPO |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |
Common units included in initial public offering | shares |  |  | 20,125,000 |  |
Price per unit for units included in initial public offering | $ / shares |  |  |  |  | $ 21
Virginia Electric and Power Company |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |
Number of operating segments |  |  |  | 2 |
Dominion Gas Holdings, LLC |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |
Number of operating segments |  |  |  | 1 |

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