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Quarterly Financial Data (Unaudited) (Narrative) (Detail) - USD ($) $ in Millions | 3 Months Ended
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Dec. 31, 2022 | Jun. 30, 2022 | Jun. 30, 2021 | Mar. 31, 2021
Quarterly Financial Information Disclosure [Line Items] |  |  |  |
Charges associated with impairment of nonregulated solar generation facilities net of tax | $ 1,100 |  |  |
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 |  |
Charges associated with the settlement of the South Carolina electric base rate case, after tax |  |  | $ 199 |
Unbilled revenue reduction, after tax |  |  |  | $ 112
Benefit for change in CCRO reserve, after tax |  |  |  | 97
Virginia Power |  |  |  |
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 |  |
Unbilled revenue reduction, after tax |  |  |  | 112
Benefit for change in CCRO reserve, after tax |  |  |  | $ 97

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- Details
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