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Variable Interest Entities (Narrative) (Detail) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) MW Generators | Dec. 31, 2016 USD ($)
Virginia Electric and Power Company |  |  |
Variable Interest Entity [Line Items] |  |  |
Securities due within one year | $ 350 | $ 850 |
Long term debt | 11,321 | 10,496 |
Payables to affiliates | 209 | 125 |
Dominion Energy Gas Holdings, LLC |  |  |
Variable Interest Entity [Line Items] |  |  |
Securities due within one year | 449 |  |
Long term debt | 3,609 | 3,570 |
Payables to affiliates | $ 65 | 62 |
Variable Interest Entity, Primary Beneficiary | Partnership Interest | Merchant Solar Projects |  |  |
Variable Interest Entity [Line Items] |  |  |
Initial membership interest percentage | 67.00% |  |
Variable Interest Entity, Primary Beneficiary | Dominion Energy Midstream Partners, LP | Partnership Interest | Limited Partner |  |  |
Variable Interest Entity [Line Items] |  |  |
Percentage of limited partner interests in Dominion Midstream Partners, LP | 60.90% |  |
Variable Interest Entity, Primary Beneficiary | Dominion Energy Midstream Partners, LP | Partnership Interest | Preferred Partner |  |  |
Variable Interest Entity [Line Items] |  |  |
Percentage of limited partner interests in Dominion Midstream Partners, LP | 37.50% |  |
Variable Interest Entity, Primary Beneficiary | SBL Holdco |  |  |
Variable Interest Entity [Line Items] |  |  |
Securities due within one year | $ 31 |  |
Long term debt | $ 299 |  |
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% |  |
Variable Interest Entity, Not Primary Beneficiary | Virginia Electric and Power Company | DES |  |  |
Variable Interest Entity [Line Items] |  |  |
Shared services purchased | $ 335 | 340 | $ 346
Payables to affiliates | 107 | 36 |
Variable Interest Entity, Not Primary Beneficiary | Dominion Energy Gas Holdings, LLC | DES |  |  |
Variable Interest Entity [Line Items] |  |  |
Shared services purchased | 126 | 126 | 123
Payables to affiliates | 46 | $ 14 |
Variable Interest Entity (VIE) or Potential VIE, Information Unavailability | Virginia Electric and Power Company |  |  |
Variable Interest Entity [Line Items] |  |  |
Long term capacity contract non utility generators (generators) | Generators |  | 3 |
Number of expired non-utility generators | Generators |  | 2 |
Aggregate generation capacity from long-term power and capacity contracts (MW) | MW |  | 218 |
Remaining purchase commitments | 150 |  |
Payment for electric capacity | 50 | $ 86 | 144
Payment for electric energy | $ 18 | $ 24 | $ 31

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