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Quarterly Financial Data (Unaudited) (Narrative) (Detail) - USD ($) $ in Millions | 3 Months Ended
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Dec. 31, 2024 | Sep. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Sep. 30, 2023
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |
Losses from lower market returns on pension and other postretirement plan assets after tax |  |  | $ 238 |  |
Gain (loss) on investments, after tax |  | $ 132 | $ 202 |  |
Investment, Type [Extensible Enumeration] |  | Nuclear Decommissioning Trust Fund [Member] | Nuclear Decommissioning Trust Fund [Member] |  |
Gain (loss) related to mark-to-market impact economic hedging activities after tax | $ (93) | $ 103 |  |  |
Expected to be recovered from customers charge after tax | $ 77 |  |  |  |
Gain on sale of Dominion Energy's noncontrolling interest in cove point |  |  |  |  | $ 348
Charges reflecting the recognition of deferred taxes |  |  |  |  | $ 939
Impairment charge associated with the East Ohio and Questar Gas Transactions, after-tax |  |  |  | $ 275 |
Impairment charge associated with the East Ohio Transaction, after-tax |  |  | $ 108 |  |

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