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Operating Segments - Dominion Energy (Narrative) (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Segment Reporting Information [Line Items] |  |
Gain (loss) on investments | $ 294 | $ 134
Charge in connection with settlement of an agreement | 47 |
Charge in connection with settlement of an agreement, after tax | 35 |
Operating Segments |  |
Segment Reporting Information [Line Items] |  |
After- tax net benefits (expenses) | 124 | 304
Gain (loss) on investments | 266 | 123
Gain (loss) on investments, after tax | $ 202 | $ 90
Investment, Type [Extensible Enumeration] | Nuclear Decommissioning Trust Fund [Member] | Nuclear Decommissioning Trust Fund [Member]
Corporate and Other | Operating Segments |  |
Segment Reporting Information [Line Items] |  |
After- tax net benefits (expenses) | $ 48 | $ 393
After- tax net benefits (expenses) for specific items | 191 | 466
Contracted Energy | Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Gain (loss) on investments, after tax | 175 | 77
Loss related to economic hedging activities | 61 |
Loss related to economic hedging activities after tax | 47 |
Gain related to economic hedging activities |  | 332
Gain related to economic hedging activities after tax |  | 253
Charge in connection with settlement of an agreement | 47 |
Charge in connection with settlement of an agreement, after tax | 35 |
Dominion Energy Virginia | Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Gain (loss) on investments, after tax | $ 27 | $ 13
Investment, Type [Extensible Enumeration] | Nuclear Decommissioning Trust Fund [Member] | Nuclear Decommissioning Trust Fund [Member]
Charge for amortization of a regulatory asset, 2021 Triennial Review |  | $ 61
Charge for amortization of a regulatory asset, 2021 Triennial Review, after tax |  | $ 45

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