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v3.19.3.a.u2

Variable Interest Entities - (Narrative) (Detail) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
May 31, 2019 USD ($) | Jun. 30, 2019 USD ($) | Dec. 31, 2019 USD ($) MW Generators | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Feb. 29, 2020
Atlantic Coast Pipeline |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Percentage of ownership interest acquired |  |  |  |  |  | 5.00%
Southern Company Gas | Dominion Energy Midstream Partners, LP | Atlantic Coast Pipeline |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Minority Interest Ownership Percentage By Parent |  |  |  |  |  | 53.00%
Variable Interest Entity, Primary Beneficiary | Partnership Interest | Merchant Solar Projects |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Initial membership interest percentage |  |  | 67.00% |  |  |
Variable Interest Entity, Not Primary Beneficiary | Gas Distribution | Atlantic Coast Pipeline | Pipelines | Jointly Owned Natural Gas Pipeline |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Initial membership interest percentage |  |  | 48.00% |  |  |
SBL Holdco | Variable Interest Entity, Primary Beneficiary |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Securities due within one year |  |  | $ 31 |  |  |
Long term debt |  |  | 267 |  |  |
Virginia Electric and Power Company |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Securities due within one year |  |  | 4 | $ 350 |  |
Long term debt |  |  | 12,325 | 11,320 |  |
Payables to affiliates |  |  | 210 | 209 |  |
Virginia Electric and Power Company | Variable Interest Entity, Not Primary Beneficiary | DES |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Payables to affiliates |  |  | 102 | 107 |  |
Shared Services Purchased |  |  | $ 387 | 119 | $ 335 |
Virginia Electric and Power Company | Variable Interest Entity (VIE) or Potential VIE, Information Unavailability |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Long term capacity contract non utility generators (generators) | Generators |  |  | 1 |  |  |
Aggregate generation capacity from long-term power and capacity contracts (MW) | MW |  |  | 218 |  |  |
Payment for electric capacity |  |  | $ 13 | 50 | 86 |
Payment for electric energy |  |  | 1 | 18 | 24 |
Payment for contract termination | $ 135 | $ 135 |  |  |  |
Payment for contract termination after tax |  | $ 100 |  |  |  |
Dominion Energy Gas Holdings, LLC |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Securities due within one year |  |  | 700 | 748 |  |
Long term debt |  |  | 4,821 | 7,022 |  |
Payables to affiliates |  |  | $ 82 | 124 |  |
Dominion Energy Gas Holdings, LLC | Dominion Energy Midstream Partners, LP |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Percentage of limited partner interests in Cove Point |  |  | 75.00% |  |  |
Minority Interest Ownership Percentage By Parent |  |  | 25.00% |  |  |
Dominion Energy Gas Holdings, LLC | Variable Interest Entity, Not Primary Beneficiary | DES |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Payables to affiliates |  |  | $ 27 | 43 |  |
Shared Services Purchased |  |  | 106 | 340 | 106 |
Dominion Energy Gas Holdings, LLC | Variable Interest Entity, Not Primary Beneficiary | DECGS And DEQPS |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Payables to affiliates |  |  | 15 | 6 |  |
Shared Services Purchased |  |  | $ 49 | $ 45 | $ 45 |

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