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Operating Segments - Dominion Energy (Narrative) (Detail) - USD ($) $ in Millions | 9 Months Ended
--- | ---
Sep. 30, 2023 | Sep. 30, 2022
Segment Reporting Information [Line Items] |  |
Gain (loss) on investments | $ 228 | $ (658)
Operating Segments |  |
Segment Reporting Information [Line Items] |  |
After- tax net benefits (expenses) | 245 | (1,900)
Operating Segments | Nuclear Decommissioning Trust Funds |  |
Segment Reporting Information [Line Items] |  |
Gain (loss) on investments | 183 | (691)
Gain (loss) on investments, after tax | 142 | (536)
Corporate and Other | Operating Segments |  |
Segment Reporting Information [Line Items] |  |
After- tax net benefits (expenses) | 26 | (1,000)
After- tax net benefits (expenses) for specific items | 231 | (1,000)
Contracted Energy | Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Loss related to economic hedging activities |  | 391
Loss related to economic hedging activities after tax |  | 296
Gain related to economic hedging activities | 335 |
Gain related to economic hedging activities after tax | 255 |
Loss associated with sale of Kewaunee |  | 649
Loss associated with sale of Kewaunee, after tax |  | 513
Contracted Energy | Operating Segments | Nuclear Decommissioning Trust Funds |  |
Segment Reporting Information [Line Items] |  |
Gain (loss) on investments, after tax | 124 | (465)
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 | 183 | 183
Charge for amortization of a regulatory asset, 2021 Triennial Review, after tax | 136 | 136
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 |  | 213
Charge for RGGI compliance cost, after tax |  | 159
Charges for Dismantling cost |  | 60
Charges for Dismantling cost, after tax |  | 45
Dominion Energy Virginia | Operating Segments | Nuclear Decommissioning Trust Funds |  |
Segment Reporting Information [Line Items] |  |
Gain (loss) on investments, after tax | 18 | $ (71)
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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