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Variable Interest Entities (Narrative) (Detail) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2019 USD ($) MW Generator | Mar. 31, 2018 USD ($) | Mar. 30, 2019 USD ($) | Dec. 31, 2018 USD ($)
Virginia Electric and Power Company |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Securities due within one year | $ 392 |  |  | $ 350 | [1]
Long term debt | 11,288 |  |  | 11,321 | [1]
Payables to affiliates | 104 |  |  | 209 | [1]
Dominion Energy Gas Holdings, LLC |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Securities due within one year | 450 |  |  | 748 | [2]
Long term debt | 7,023 |  |  | 7,022 | [2]
Payables to affiliates | 106 |  |  | 124 | [2]
Dominion Energy Gas Holdings, LLC | DECGS |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Shared services purchased | 4 | $ 4 |  |  |
Payables to affiliates |  |  | $ 5 |  |
Dominion Energy Gas Holdings, LLC | DEQPS |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Shared services purchased | 8 | 7 |  |  |
Payables to affiliates |  |  |  | 6 |
Variable Interest Entity, Primary Beneficiary | SBL Holdco |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Securities due within one year | 29 |  |  | 31 |
Long term debt | $ 301 |  |  | 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 |  |  |  |
Remaining purchase commitments | $ 159 |  |  |  |
Payment for electric capacity | 13 | 13 |  |  |
Payment for electric energy | 1 | 5 |  |  |
Variable Interest Entity, Not Primary Beneficiary | Virginia Electric and Power Company | DES |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Shared services purchased | 89 | 89 |  |  |
Payables to affiliates | 22 |  |  | 107 |
Variable Interest Entity, Not Primary Beneficiary | Dominion Energy Gas Holdings, LLC | DES |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Shared services purchased | $ 28 | $ 28 |  |  |
Payables to affiliates |  |  | 8 | 43 |
Variable Interest Entity, Not Primary Beneficiary | Dominion Energy Gas Holdings, LLC | DES | Discontinued Operations |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Variable interest entity, current liabilities |  |  | $ 5 | $ 18 |
[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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