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Variable Interest Entities (Narrative) (Detail) $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
May 31, 2019 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) MW Generator | Jun. 30, 2018 USD ($) | Dec. 31, 2018 USD ($)
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Long term debt |  | $ 31,853 |  | $ 31,853 |  | $ 26,328 |
Virginia Electric and Power Company |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Securities due within one year |  | 2 |  | 2 |  | 350 | [1]
Long term debt |  | 11,291 |  | 11,291 |  | 11,321 | [1]
Payables to affiliates |  | 182 |  | 182 |  | 209 | [1]
Virginia Electric and Power Company | DECGS |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Shared services purchased |  |  |  |  | $ 9 |  |
Virginia Electric and Power Company | DEQPS |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Shared services purchased |  |  |  |  | 15 |  |
Dominion Energy Gas Holdings, LLC |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Securities due within one year |  | 450 |  | 450 |  | 748 | [2]
Long term debt |  | 7,031 |  | 7,031 |  | 7,022 | [2]
Payables to affiliates |  | 69 |  | 69 |  | 124 | [2]
Liabilities discontinued operation |  | 1,030 |  | 1,030 |  | 1,273 | [2]
Dominion Energy Gas Holdings, LLC | DECGS |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Shared services purchased |  | 5 | $ 5 | 9 |  |  |
Payables to affiliates |  | 12 |  | 12 |  | 6 |
Dominion Energy Gas Holdings, LLC | DEQPS |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Shared services purchased |  | 11 | 8 | 20 |  |  |
Payables to affiliates |  | 12 |  | 12 |  | 6 |
Variable Interest Entity, Primary Beneficiary | SBL Holdco |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Securities due within one year |  | 32 |  | 32 |  | 31 |
Long term debt |  | 290 |  | $ 290 |  | 299 |
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) | Generator |  |  |  | 1 |  |  |
Aggregate generation capacity from long-term power and capacity contracts (MW) | MW |  |  |  | 218 |  |  |
Payment for contract termination | $ 135 |  |  | $ 135 |  |  |
Payment for contract termination after tax |  | 100 |  | 100 |  |  |
Payment for electric capacity |  | 12 |  | 13 | 25 |  |
Payment for electric energy |  |  | 5 | 1 | 10 |  |
Variable Interest Entity, Not Primary Beneficiary | Virginia Electric and Power Company | DES |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Shared services purchased |  | 129 | 83 | 218 | 172 |  |
Payables to affiliates |  | 92 |  | 92 |  | 107 |
Variable Interest Entity, Not Primary Beneficiary | Dominion Energy Gas Holdings, LLC |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Liabilities discontinued operation |  | 19 |  | 19 |  | 18 |
Variable Interest Entity, Not Primary Beneficiary | Dominion Energy Gas Holdings, LLC | DES |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Shared services purchased |  | 39 | $ 26 | 67 | $ 54 |  |
Payables to affiliates |  | $ 30 |  | $ 30 |  | $ 44 |
[1] | Virginia Power’s Consolidated Balance Sheet at December 31, 2018 has been derived from the audited Consolidated Balance Sheet at that date.
[2] | Dominion Energy Gas’ Consolidated Balance Sheet at December 31, 2018 has been derived from the audited Consolidated Balance Sheet at that date.

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