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Significant Accounting Policies (Narrative) (Detail) - USD ($) $ in Millions | Jan. 01, 2021 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Significant Accounting Policies [Line Items] |  |  |
Increase (decrease) in retained earnings | $ 660 |  |
Cumulative increase to noncontrolling interests | 223 |  |
Accrued unbilled revenue |  | $ 1,000 | $ 1,100
Current Assets Held for Sale | Held for Sale |  |  |
Significant Accounting Policies [Line Items] |  |  |
Accrued unbilled revenue |  | 284 | 324
Virginia Electric and Power Company |  |  |
Significant Accounting Policies [Line Items] |  |  |
Increase (decrease) in retained earnings | $ 143 |  |
Accrued unbilled revenue |  | $ 550 | $ 620
Four Brothers And Three Cedars | Dominion Energy Midstream Partners, LP | Terra Nova Renewable Partners | Nonregulated Solar Projects |  |  |
Significant Accounting Policies [Line Items] |  |  |
Percentage of equity interest sold to noncontrolling interest owners |  | 33.00% |

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