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Variable Interest Entities - (Narrative) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Variable Interest Entity [Line Items] |  |  |  |
Payable to affiliates | [1] | $ 1,732 | $ 1,695 |
Virginia Electric and Power Company |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Payable to affiliates |  | $ 908 | 826 |
Variable Interest Entity Not Primary Beneficiary | Distribution | Atlantic Coast Pipeline | Pipelines | Jointly Owned Natural Gas Pipeline |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Initial membership interest percentage |  | 53.00% |  |
Variable Interest Entity Not Primary Beneficiary | Virginia Electric and Power Company | DES |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Shared Services Purchased |  | $ 463 | 396 | $ 380
Variable Interest Entity Not Primary Beneficiary | Virginia Electric and Power Company | DES | Related Party |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Payable to affiliates |  | $ 32 | $ 28 |
[1] | See Note 9 for amounts attributable to related parties.

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