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Variable Interest Entities (Narrative) (Detail) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2018 USD ($) MW generator | Mar. 31, 2017 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 generator
Variable Interest Entity [Line Items] |  |  |  |  |
Securities due within one year | $ 3,603 |  | $ 3,078 | [1] |
Long term debt | 31,120 |  | 30,948 | [1] |
Virginia Electric and Power Company |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Securities due within one year | 600 |  | 850 | [2] |
Long term debt | 11,090 |  | 10,496 | [2] |
Affiliated current borrowings | 11 |  | 33 | [2] |
Dominion Energy Gas Holdings, LLC |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Long term debt | 3,579 |  | 3,570 | [3] |
Affiliated current borrowings | 41 |  | 18 | [3] |
Variable Interest Entity, Primary Beneficiary | SBL Holdco |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Securities due within one year | 30 |  |  |  |
Long term debt | $ 332 |  |  |  |
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 | 3 |  |  |  |
Long term capacity contract non utility generators expired | generator |  |  |  |  | 2
Aggregate generation capacity from long-term power and capacity contracts (MW) | MW | 218 |  |  |  |
Remaining purchase commitments | $ 188 |  |  |  |
Payment for electric capacity | 13 | $ 28 |  |  |
Payment for electric energy | 5 | 8 |  |  |
Variable Interest Entity, Not Primary Beneficiary | Virginia Electric and Power Company | DES |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Shared services purchased | 89 | 85 |  |  |
Variable Interest Entity, Not Primary Beneficiary | Virginia Electric and Power Company | DES | Payables to Affiliates |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Affiliated current borrowings | 43 |  | 36 |  |
Variable Interest Entity, Not Primary Beneficiary | Dominion Energy Gas Holdings, LLC | DES |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Shared services purchased | 32 | $ 31 |  |  |
Variable Interest Entity, Not Primary Beneficiary | Dominion Energy Gas Holdings, LLC | DES | Payables to Affiliates |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Affiliated current borrowings | $ 11 |  | $ 14 |  |
[1] | Dominion Energy’s Consolidated Balance Sheet at December 31, 2017 has been derived from the audited Consolidated Balance Sheet at that date.
[2] | Virginia Power’s Consolidated Balance Sheet at December 31, 2017 has been derived from the audited Consolidated Balance Sheet at that date.
[3] | Dominion Energy Gas’ Consolidated Balance Sheet at December 31, 2017 has been derived from the audited Consolidated Balance Sheet at that date.

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