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v3.25.3

Acquisitions and Dispositions (Business Review Dispositions) (Narrative) (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | [1] | Mar. 31, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024 | Dec. 31, 2023 | Apr. 30, 2024 | Sep. 30, 2023
Business Acquisition And Dispositions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Income tax expense (benefit) | $ 216.0 | [1] | $ 213.0 |  | $ 476.0 | [2] | $ 421.0 | [2] |  |  |  |
Deferred income tax expense (benefit) |  |  |  |  | 455.0 |  | $ (281.0) |  |  |  |  |
East Ohio | Enbridge |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition And Dispositions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Disposal group, total value of consideration |  |  |  |  |  |  |  |  |  |  |  | $ 6,600.0
Disposal group, cash consideration |  |  |  |  |  |  |  |  |  |  |  | 4,300.0
Disposal group, indebtedness |  |  |  |  |  |  |  |  |  |  |  | 2,300.0
Disposal group, recognized a pre-tax gain (loss) |  |  |  | $ (97.0) |  |  |  |  |  |  |  |
Disposal group, gain (loss) recorded after tax |  |  |  | (109.0) |  |  |  |  |  |  |  |
Goodwill write-off |  |  |  | 1,500.0 |  |  |  |  |  |  |  |
Deferred income tax expense (benefit) |  |  |  |  |  |  |  |  |  | $ 29.0 |  |
Questar Gas and Wexpro | Enbridge |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition And Dispositions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Disposal group, total value of consideration |  |  |  |  |  |  |  |  |  |  |  | 4,300.0
Disposal group, cash consideration |  |  |  |  |  |  |  |  |  |  |  | 3,000.0
Disposal group, indebtedness |  |  |  |  |  |  |  |  |  |  |  | 1,300.0
Disposal group, recognized a pre-tax gain (loss) | (8.0) |  |  | 78.0 |  |  |  |  |  | 236.0 |  |
Disposal group, gain (loss) recorded after tax | $ 34.0 |  |  | 78.0 |  |  |  |  |  | 231.0 |  |
Goodwill write-off |  |  |  |  |  |  |  |  | $ 700.0 |  |  |
Income tax expense (benefit) |  |  |  | (5.0) |  |  |  |  |  |  |  |
Deferred income tax expense (benefit) |  |  |  | $ (10.0) |  |  |  |  |  | 472.0 |  |
PSNC | Enbridge |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition And Dispositions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Disposal group, total value of consideration |  |  |  |  |  |  |  |  |  |  |  | 3,300.0
Disposal group, cash consideration |  |  |  |  |  |  |  |  |  |  |  | 2,000.0
Disposal group, indebtedness |  |  |  |  |  |  |  |  |  |  |  | $ 1,300.0
Disposal group, recognized a pre-tax gain (loss) |  |  |  |  | (34.0) |  |  |  |  |  |  |
Disposal group, gain (loss) recorded after tax |  |  |  |  | (30.0) |  |  |  |  |  |  |
Goodwill write-off |  |  |  |  | $ 0.7 |  |  |  |  |  |  |
Deferred income tax expense (benefit) |  |  |  |  |  |  |  |  |  | $ 334.0 |  |
Deferred tax of classified held for sale |  |  |  |  |  |  |  |  | $ 16.0 |  |  |
Other Sales | Birdseye and Madison |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition And Dispositions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Disposal group, cash consideration |  |  |  |  |  |  |  |  |  |  | $ 17.0 |
[1] | The significant expense categories and amounts in the segment information presented above align with the segment-level information that is regularly provided to Dominion Energy’s CODM.
[2] | The significant expense categories and amounts in the segment information presented above align with the segment-level information that is regularly provided to Dominion Energy’s CODM.

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