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Variable Interest Entities - (Narrative) (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) MW Generators | Dec. 31, 2016 USD ($)
Variable Interest Entity, Primary Beneficiary | Partnership Interest | Merchant Solar Projects |  |  |
Initial membership interest percentage | 67.00% |  |
Variable Interest Entity, Primary Beneficiary | Dominion Energy Midstream Partners, LP | Partnership Interest | Limited Partner |  |  |
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 |  |  |
Percentage of limited partner interests in Dominion Midstream Partners, LP | 37.50% |  |
Variable Interest Entity, Not Primary Beneficiary | Distribution | Atlantic Coast Pipeline | Pipelines | Jointly Owned Natural Gas Pipeline |  |  |
Initial membership interest percentage | 48.00% |  |
SBL Holdco | Variable Interest Entity, Primary Beneficiary |  |  |
Securities due within one year | $ 31 |  |
Long term debt | 299 |  |
Virginia Electric and Power Company |  |  |
Securities due within one year | 350 | $ 850 |
Long term debt | 11,321 | 10,496 |
Payables to affiliates | 209 | 125 |
Virginia Electric and Power Company | Variable Interest Entity, Not Primary Beneficiary | DES |  |  |
Payables to affiliates | 107 | 36 |
Shared Services Purchased | 335 | $ 340 | $ 346
Virginia Electric and Power Company | Variable Interest Entity (VIE) or Potential VIE, Information Unavailability |  |  |
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
Dominion Energy Gas Holdings, LLC |  |  |
Securities due within one year | 748 | 5 |
Long term debt | 7,022 | 4,295 |
Payables to affiliates | 124 | 138 |
Dominion Energy Gas Holdings, LLC | Dominion Energy Questar Pipeline |  |  |
Equity Contribution | 37 |  |
Dominion Energy Gas Holdings, LLC | Variable Interest Entity, Not Primary Beneficiary | DES |  |  |
Payables to affiliates | 43 | 14 |
Shared Services Purchased | 106 | 106 | 98
Dominion Energy Gas Holdings, LLC | Variable Interest Entity, Not Primary Beneficiary | DECGS And DEQPS |  |  |
Payables to affiliates | 6 | 6 |
Shared Services Purchased | $ 45 | $ 45 | $ 18

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