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Variable Interest Entities (Narrative) (Detail) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
May 31, 2019 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Dec. 31, 2019 USD ($) MW Generator
Virginia Electric and Power Company |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Long term debt |  | $ 12,328 |  |  | $ 12,328 |  | $ 12,325 | [1]
Payables to affiliates |  | 328 |  |  | 328 |  | 210 | [1]
Variable Interest Entity, Primary Beneficiary | SBL Holdco |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Securities due within one year |  | 31 |  |  | 31 |  | 31 |
Long term debt |  | 260 |  |  | 260 |  | $ 267 |
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 |  | $ 135 |  |
Payment for contract termination after tax |  |  |  | $ 100 |  | 100 |  |
Payment for electric capacity |  |  |  |  |  | 13 |  |
Payment for electric energy |  |  |  |  |  | 1 |  |
Variable Interest Entity, Not Primary Beneficiary | Virginia Electric and Power Company | DES |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Shared services purchased |  | 81 | $ 83 |  | 260 | $ 301 |  |
Payables to affiliates |  | $ 171 |  |  | $ 171 |  | $ 102 |
[1] | Virginia Power’s Consolidated Balance Sheet at December 31, 2019 has been derived from the audited Consolidated Balance Sheet at that date.

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