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Operating Segments - Dominion Energy (Narrative) (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022
Segment Reporting Information [Line Items] |  |
Gain (loss) on investments | $ 134 | $ (113)
Operating Segments |  |
Segment Reporting Information [Line Items] |  |
After- tax net benefits (expenses) | 272 | (269)
Operating Segments | Nuclear Decommissioning Trust Funds |  |
Segment Reporting Information [Line Items] |  |
Gain (loss) on investments | 123 | (125)
Gain (loss) on investments, after tax | 90 | (102)
Corporate and Other | Operating Segments |  |
Segment Reporting Information [Line Items] |  |
After- tax net benefits (expenses) | 86 | (311)
After- tax net benefits (expenses) for specific items | 148 | (289)
Contracted Assets | Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Loss related to economic hedging activities |  | 66
Gain related to economic hedging activities | 291 |
Loss related to economic hedging activities after tax |  | 47
Gain related to economic hedging activities after tax | 221 |
Contracted Assets | Operating Segments | Nuclear Decommissioning Trust Funds |  |
Segment Reporting Information [Line Items] |  |
Gain (loss) on investments, after tax | 77 | (90)
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 | 61 | 61
Charge for amortization of a regulatory asset, 2021 Triennial Review, after tax | 45 | 45
Dominion Energy Virginia | Operating Segments | Nuclear Decommissioning Trust Funds |  |
Segment Reporting Information [Line Items] |  |
Gain (loss) on investments, after tax | $ 13 | $ (12)

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