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Operating Segments - Dominion Energy (Narrative) (Detail) - USD ($) $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2023 | Jun. 30, 2022
Segment Reporting Information [Line Items] |  |
Gain (loss) on investments | $ 308 | $ (556)
Operating Segments |  |
Segment Reporting Information [Line Items] |  |
After- tax net benefits (expenses) | 364 | (1,500)
Operating Segments | Nuclear Decommissioning Trust Funds |  |
Segment Reporting Information [Line Items] |  |
Gain (loss) on investments | 281 | (579)
Gain (loss) on investments, after tax | 208 | (450)
Corporate and Other | Operating Segments |  |
Segment Reporting Information [Line Items] |  |
After- tax net benefits (expenses) | 112 | (1,500)
After- tax net benefits (expenses) for specific items | 279 | (1,400)
Contracted Assets | Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Loss related to economic hedging activities |  | 126
Loss related to economic hedging activities after tax |  | 91
Gain related to economic hedging activities | 333 |
Gain related to economic hedging activities after tax | 254 |
Loss associated with sale of Kewaunee |  | 649
Loss associated with sale of Kewaunee, after tax |  | 513
Contracted Assets | Operating Segments | Nuclear Decommissioning Trust Funds |  |
Segment Reporting Information [Line Items] |  |
Gain (loss) on investments, after tax | 178 | (392)
Dominion Energy Virginia | Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Charge associated with storm damage and service restoration |  | 94
Charge associated with storm damage and service restoration, after tax |  | 70
Charge for amortization of a regulatory asset, 2021 Triennial Review | 122 | 122
Charge for amortization of a regulatory asset, 2021 Triennial Review, after tax | 91 | 91
Charge in connection with comprehensive settlement agreement for fuel expenses |  | 191
Charge in connection with comprehensive settlement agreement for fuel expenses, after-tax |  | 142
Charge for RGGI compliance cost |  | 180
Charge for RGGI compliance cost, after tax |  | 134
Charges for Dismantling cost |  | 42
Charges for Dismantling cost, after tax |  | 31
Dominion Energy Virginia | Operating Segments | Nuclear Decommissioning Trust Funds |  |
Segment Reporting Information [Line Items] |  |
Gain (loss) on investments, after tax | 30 | $ (58)
Dominion Energy Virginia | Deferred amounts related to certain riders | Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Charge for the write-off of certain previously deferred amounts | 36 |
Charge for the write-off of certain previously deferred amounts, after tax | 27 |
Dominion Energy South Carolina | Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Benefit related to real estate transactions | 31 |
Benefit related to real estate transactions, after tax | $ 23 |

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