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Operating Segments - Dominion Energy (Narrative) (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Mar. 31, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Segment Reporting Information [Line Items] |  |  |  |  |
Gain (loss) on investments |  |  |  | $ 589 | $ 228
Charge for the write-off of certain previously deferred amounts | $ 122 |  | $ 1 | 219 | 136
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) |  |  |  | 155 |
Gain (loss) on investments |  |  |  | 518 | 183
Gain (loss) on investments, after tax |  |  |  | $ 402 | $ 142
Investment, Type [Extensible Enumeration] | Nuclear Decommissioning Trust Fund [Member] |  | Nuclear Decommissioning Trust Fund [Member] | 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) |  |  |  | $ 28 | $ (14)
After- tax net benefits (expenses) for specific items |  |  |  | 319 | 245
Contracted Energy | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Gain (loss) on investments, after tax |  |  |  | 347 | 124
Loss related to economic hedging activities |  |  |  | 107 |
Loss related to economic hedging activities after tax |  |  |  | 82 |
Gain related to economic hedging activities |  |  |  |  | 335
Gain related to economic hedging activities after tax |  |  |  |  | 255
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 |  |  |  | $ 55 | $ 18
Investment, Type [Extensible Enumeration] | Nuclear Decommissioning Trust Fund [Member] |  | Nuclear Decommissioning Trust Fund [Member] | Nuclear Decommissioning Trust Fund [Member] | Nuclear Decommissioning Trust Fund [Member]
Charge for amortization of a regulatory asset, 2021 Triennial Review |  |  |  |  | $ 183
Charge for amortization of a regulatory asset, 2021 Triennial Review, after tax |  |  |  |  | 136
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 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
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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