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Operating Segments - Dominion Energy (Narrative) (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Segment Reporting Information [Line Items] |  |  |
Gain (loss) on investments |  | $ 173 | $ 395
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) |  | (7) | 19
Gain (loss) on investments |  | 156 | 348
Gain (loss) on investments, after tax |  | $ 87 | $ 216
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) |  | $ (102) | $ (314)
After- tax net benefits (expenses) for specific items |  | (27) | (86)
Contracted Energy | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Gain (loss) on investments, after tax |  | 74 | 187
Gain (loss) related to economic hedging activities |  | 26 | (167)
Gain (loss) related to economic hedging activities after tax |  | 19 | (127)
Charge in connection with settlement of an agreement |  |  | 47
Charge in connection with settlement of an agreement, after tax |  |  | 35
Charge for impairment of nonregulated renewable natural gas facilities |  |  | 33
Charge for impairment of nonregulated renewable natural gas facilities after tax |  |  | 25
Dominion Energy Virginia | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Gain (loss) on investments, after tax |  | $ 13 | $ 29
Investment, Type [Extensible Enumeration] |  | Nuclear Decommissioning Trust Fund [Member] | Nuclear Decommissioning Trust Fund [Member]
Share of costs not expected to be recovered from customers on the CVOW commercial project |  | $ 48 |
Share of costs not expected to be recovered from customers on the CVOW commercial project, after tax |  | 36 |
Loss associated with severe weather events |  | 106 |
Loss associated with severe weather events, after-tax |  | $ 79 |

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