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Variable Interest Entities (Narrative) (Detail) $ in Millions | 3 Months Ended | 6 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) MW | Jun. 30, 2017 USD ($) | Sep. 30, 2017 generator | Dec. 31, 2017 USD ($)
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Securities due within one year |  | $ 2,950 |  | $ 2,950 |  |  | $ 3,078 | [1]
Long term debt |  | 32,115 |  | 32,115 |  |  | 30,948 | [1]
Virginia Electric and Power Company |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Securities due within one year | [2] |  |  |  |  |  | 850 |
Long term debt |  | 11,091 |  | 11,091 |  |  | 10,496 | [2]
Affiliated current borrowings |  | 25 |  | 25 |  |  | 33 | [2]
Dominion Energy Gas Holdings, LLC |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Long term debt |  | 4,062 |  | 4,062 |  |  | 3,570 | [3]
Affiliated current borrowings |  | 56 |  | 56 |  |  | 18 | [3]
Variable Interest Entity, Primary Beneficiary | SBL Holdco |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Securities due within one year |  | 29 |  | 29 |  |  |  |
Long term debt |  | 324 |  | $ 324 |  |  |  |
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 |  |
Number of expired non-utility generators | generator |  |  |  |  |  | 2 |  |
Aggregate generation capacity from long-term power and capacity contracts (MW) | MW |  |  |  | 218 |  |  |  |
Remaining purchase commitments |  | 175 |  | $ 175 |  |  |  |
Payment for electric capacity |  | 12 | $ 28 | 25 | $ 56 |  |  |
Other energy-related purchases |  | 5 | 7 | 10 | 15 |  |  |
Variable Interest Entity, Not Primary Beneficiary | Virginia Electric and Power Company | DES |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Shared services purchased |  | 83 | 83 | 172 | 168 |  |  |
Variable Interest Entity, Not Primary Beneficiary | Virginia Electric and Power Company | DES | Payables to Affiliates |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Affiliated current borrowings |  | 35 |  | 35 |  |  | 36 |
Variable Interest Entity, Not Primary Beneficiary | Dominion Energy Gas Holdings, LLC | DES |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Shared services purchased |  | 31 | $ 31 | 63 | $ 62 |  |  |
Variable Interest Entity, Not Primary Beneficiary | Dominion Energy Gas Holdings, LLC | DES | Payables to Affiliates |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Affiliated current borrowings |  | $ 12 |  | $ 12 |  |  | $ 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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