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Variable Interest Entities (Narrative) (Details) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2016 | Dec. 31, 2016 USD ($) generator MW | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Variable Interest Entity [Line Items] |  |  |  |
Securities due within one year |  | $ 1,709 | $ 1,825 |
Amount of long term debt |  | 30,231 | 23,468 |
Virginia Electric and Power Company |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Securities due within one year |  | 678 | 476 |
Amount of long term debt |  | 9,852 | 8,892 |
Dominion Gas Holdings, LLC |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Securities due within one year |  | 0 | 400 |
Amount of long term debt |  | 3,528 | 2,869 |
Variable Interest Entity, Primary Beneficiary | SBL Holdco |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Securities due within one year |  | 17 |  |
Amount of long term debt |  | $ 377 |  |
Variable Interest Entity, Primary Beneficiary | Partnership Interest | Limited Partner | Dominion Midstream Partners, LP |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Percentage of limited partner interests in Dominion Midstream Partners, LP |  | 50.90% |  |
Variable Interest Entity, Primary Beneficiary | Partnership Interest | Preferred Partner | Dominion Midstream Partners, LP |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Percentage of limited partner interests in Dominion Midstream Partners, LP |  | 37.50% |  |
Variable Interest Entity, Primary Beneficiary | Merchant Solar Projects | Partnership Interest |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Initial membership interest percentage | 67.00% |  |  |
Variable Interest Entity, Not Primary Beneficiary | Virginia Electric and Power Company | DRS |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Shared services purchased |  | $ 346 | 318 | $ 335
Variable Interest Entity, Not Primary Beneficiary | Dominion Gas Holdings, LLC | DRS |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Shared services purchased |  | $ 123 | 115 | 106
Variable Interest Entity, Not Primary Beneficiary | Distribution | Atlantic Coast Pipeline | Pipelines | Jointly Owned Natural Gas Pipeline |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Initial membership interest percentage |  | 48.00% |  |
Potential VIE | Virginia Electric and Power Company |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Number of non utility generators | generator |  | 5 |  |
Number of expired non-utility generators | generator |  | 2 |  |
Aggregate generation capacity from long-term power and capacity contracts (MW) | MW |  | 418 |  |
Remaining purchase commitments |  | $ 287 |  |
Payment for electric capacity |  | 144 | 200 | 223
Payment for electric energy |  | $ 31 | $ 83 | $ 138

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