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Variable Interest Entities - (Narrative) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Variable Interest Entity [Line Items] |  |  |  |
Payables to affiliates | [1] | $ 1,697 | $ 1,585 |
Virginia Electric and Power Company |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Payables to affiliates |  | $ 826 | 567 |
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 |  | $ 396 | 380 | $ 349
Variable Interest Entity Not Primary Beneficiary | Virginia Electric and Power Company | DES | Related Party [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Payables to affiliates |  | $ 28 | $ 20 |
Variable Interest Entity Not Primary Beneficiary | Partnership Interest | Cove Point |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Initial membership interest percentage |  | 50.00% |  |
[1] | See Note 9 for amounts attributable to related parties.

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