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Variable Interest Entities (Narrative) (Detail) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
May 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) MW Generator | Sep. 30, 2018 USD ($) | Dec. 31, 2018 USD ($)
Virginia Electric and Power Company |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Securities due within one year |  | $ 3 |  |  | $ 3 |  | $ 350 | [1]
Long term debt |  | 11,792 |  |  | 11,792 |  | 11,321 | [1]
Payables to affiliates |  | 138 |  |  | 138 |  | 209 | [1]
Dominion Energy Gas Holdings, LLC |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Securities due within one year |  | 450 |  |  | 450 |  | 748 | [2]
Long term debt |  | 4,028 |  |  | 4,028 |  | 7,022 | [2]
Payables to affiliates |  | 53 |  |  | 53 |  | 124 | [2]
Variable Interest Entity, Primary Beneficiary | SBL Holdco |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Securities due within one year |  | 31 |  |  | 31 |  | 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 |  |  |  |  |
Payment for electric capacity |  |  |  | $ 13 | $ 13 | $ 38 |  |
Payment for electric energy |  |  |  | 4 | 1 | 14 |  |
Variable Interest Entity, Not Primary Beneficiary | Virginia Electric and Power Company | DES |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Shared services purchased |  | 83 |  | 79 | 301 | 251 |  |
Payables to affiliates |  | 50 |  |  | 50 |  | 107 |
Variable Interest Entity, Not Primary Beneficiary | Dominion Energy Gas Holdings, LLC |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Payables to affiliates |  | 8 |  |  | 8 |  | 18 |
Variable Interest Entity, Not Primary Beneficiary | Dominion Energy Gas Holdings, LLC | DEQPS |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Shared services purchased |  | 8 |  | 7 | 28 | 22 |  |
Payables to affiliates |  | 10 |  |  | 10 |  | 6 |
Variable Interest Entity, Not Primary Beneficiary | Dominion Energy Gas Holdings, LLC | DECGS |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Shared services purchased |  | 4 |  | 4 | 13 | 13 |  |
Payables to affiliates |  | 10 |  |  | 10 |  | 6 |
Variable Interest Entity, Not Primary Beneficiary | Dominion Energy Gas Holdings, LLC | DES |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Shared services purchased |  | 25 |  | $ 26 | 92 | $ 80 |  |
Payables to affiliates |  | $ 15 |  |  | $ 15 |  | $ 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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