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Variable Interest Entities (Narrative) (Detail) $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
May 31, 2019 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) | Dec. 31, 2019 USD ($) MW Generator
Virginia Electric and Power Company |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Long term debt |  | $ 12,328 |  | $ 12,328 |  | $ 12,325 | [1]
Payables to affiliates |  | 406 |  | 406 |  | $ 210 | [1]
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) | Generator |  |  |  |  |  | 1 |
Aggregate generation capacity from long-term power and capacity contracts (MW) | MW |  |  |  |  |  | 218 |
Payment for contract termination | $ 135 |  | $ 135 |  | $ 135 |  |
Payment for contract termination after tax |  |  | 100 |  | 100 |  |
Payment for electric capacity |  |  |  |  | 13 |  |
Payment for electric energy |  |  |  |  | 1 |  |
Virginia Electric and Power Company | Variable Interest Entity, Not Primary Beneficiary | DES |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Shared services purchased |  | 86 | 129 | 179 | 218 |  |
Payables to affiliates |  | 92 |  | 92 |  | $ 102 |
Dominion Energy Gas Holdings, LLC |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Long term debt |  | 4,324 |  | 4,324 |  | 4,821 | [2]
Payables to affiliates |  | 159 |  | 159 |  | 82 | [2]
Dominion Energy Gas Holdings, LLC | Variable Interest Entity, Not Primary Beneficiary | DECGS |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Shared services purchased |  | 3 | 5 | 7 | 9 |  |
Dominion Energy Gas Holdings, LLC | Variable Interest Entity, Not Primary Beneficiary | DEQPS |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Shared services purchased |  | 7 | 11 | 14 | 20 |  |
Dominion Energy Gas Holdings, LLC | Variable Interest Entity, Not Primary Beneficiary | DECGS and DEQPS |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Payables to affiliates |  | 18 |  | 18 |  | 15 |
Dominion Energy Gas Holdings, LLC | Variable Interest Entity, Not Primary Beneficiary | DES |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Shared services purchased |  | 27 | $ 39 | 58 | $ 67 |  |
Payables to affiliates |  | 38 |  | 38 |  | 27 |
Variable Interest Entity, Primary Beneficiary | SBL Holdco |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Securities due within one year |  | 32 |  | 32 |  | 31 |
Long term debt |  | $ 258 |  | $ 258 |  | $ 267 |
[1] | Virginia Power’s Consolidated Balance Sheet at December 31, 2019 has been derived from the audited Consolidated Balance Sheet at that date.
[2] | Dominion Energy Gas’ Consolidated Balance Sheet at December 31, 2019 has been derived from the audited Consolidated Balance Sheet at that date.

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