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Quarterly Financial Data (Unaudited) (Narrative) (Detail) - USD ($) $ in Millions | 3 Months Ended
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Dec. 31, 2023 | Sep. 30, 2023 | Dec. 31, 2022 | Jun. 30, 2022
Quarterly Financial Information Disclosure [Line Items] |  |  |  |
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 | $ 323 |  |  |
Charges associated with impairment of nonregulated solar generation facilities after tax |  |  | $ 633 |
Loss associated with sale of Kewaunee, after tax |  |  |  | $ 513
Charge in connection with comprehensive settlement agreement for fuel expenses, after-tax |  |  |  | 142
Charge for RGGI compliance cost, after tax |  |  |  | 134
Virginia Electric and Power Company |  |  |  |
Quarterly Financial Information Disclosure [Line Items] |  |  |  |
Charge in connection with comprehensive settlement agreement for fuel expenses, after-tax |  |  |  | 142
Charge for RGGI compliance cost, after tax |  |  |  | $ 134

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