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Variable Interest Entities (Narrative) (Detail) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 USD ($) MW Generator | Mar. 31, 2018 USD ($) | 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 | 451 |  | 449 | [2]
Long term debt | 3,607 |  | 3,609 | [2]
Payables to affiliates | 56 |  | 65 | [2]
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 | 35 | $ 32 |  |
Payables to affiliates | $ 11 |  | $ 46 |
[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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