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Variable Interest Entities - (Narrative) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Virginia Electric and Power Company |  |  |
Variable Interest Entity [Line Items] |  |  |
Payables to affiliates | $ 255 | $ 121 |
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
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% |  |

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