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Operating Segments - Dominion Energy (Narrative) (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Mar. 31, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Segment Reporting Information [Line Items] |  |  |
Gain (loss) on investments |  | $ 442 | $ 589
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) |  | 81 | 76
Gain (loss) on investments |  | 415 | 515
Gain (loss) on investments, after tax |  | 255 | $ 323
Investment, Type [Extensible Enumeration] |  |  | Nuclear Decommissioning Trust Fund [Member]
Corporate and Other | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
After- tax net benefits (expenses) |  | (108) | $ (272)
After-tax net income for specific items |  | 58 | 12
Contracted Energy | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Gain (loss) on investments, after tax |  | 221 | 278
Gain (loss) related to economic hedging activities |  | (16) | (107)
Gain (loss) related to economic hedging activities after tax |  | (12) | (82)
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 |  |  | 60
Charge for impairment of nonregulated renewable natural gas facilities after tax |  |  | 46
Dominion Energy Virginia | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Gain (loss) on investments, after tax |  | $ 34 | $ 45
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 |  | $ 112 |
Share of costs not expected to be recovered from customers on the CVOW commercial project, after tax |  | 84 |
Loss associated with severe weather events |  | 106 |
Loss associated with severe weather events, after-tax |  | $ 79 |
Charge related to write-off of certain early stage development costs |  |  | $ 30
Charge related to write-off of certain early stage development costs after tax |  |  | 22
Dominion Energy South Carolina | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Charge in connection with the electric base rate case |  |  | 58
Charge in connection with the electric base rate case, after tax |  |  | $ 44

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