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Acquisitions and Dispositions (Business Review Dispositions) (Narrative) (Detail) - USD ($) | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Feb. 29, 2024 | Sep. 30, 2023 | Aug. 31, 2023
Business Acquisition And Dispositions [Line Items] |  |  |  |  |  |  |  |  |  |  |
State |  |  | $ 60,000,000 |  | $ 277,000,000 |  | $ 59,000,000 |  |  |  |
Deferred taxes |  |  | (302,000,000) |  | 1,474,000,000 |  | 58,000,000 |  |  |  |
Income tax expense (benefit) |  |  | 308,000,000 | [1] | 568,000,000 | [2] | $ 59,000,000 | [3] |  |  |
Impairment of goodwill |  |  | 0 |  |  |  |  |  |  |  |
East Ohio | Enbridge |  |  |  |  |  |  |  |  |  |  |
Business Acquisition And Dispositions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Disposal group, total value of consideration |  |  |  |  |  |  |  |  |  | $ 6,600,000,000 |
Disposal group, cash consideration |  |  |  |  |  |  |  |  |  | 4,300,000,000 |
Disposal group, indebtedness |  |  |  |  |  |  |  |  |  | 2,300,000,000 |
Disposal group, recognized a pre-tax gain (loss) |  |  | (97,000,000) |  |  |  |  |  |  |  |
Disposal group, gain (loss) recorded after tax |  |  | (109,000,000) |  |  |  |  |  |  |  |
Goodwill write-off |  |  | $ 1,500,000,000 |  |  |  |  |  |  |  |
Deferred taxes |  |  |  |  | 29,000,000 |  |  |  |  |  |
Disposal group, transition services description |  |  | At the closing of the East Ohio Transaction, Dominion Energy and Enbridge entered into a transition services agreement pursuant to which Dominion Energy will continue to provide certain services to support the ongoing operations of East Ohio for up to approximately two years. Enbridge has also agreed to provide certain services to Dominion Energy. |  |  |  |  |  |  |  |
Impairment of goodwill |  |  |  |  | 50,000,000 |  |  |  |  |  |
Goodwill impairment after tax |  |  |  |  | 45,000,000 |  |  |  |  |  |
PSNC | Enbridge |  |  |  |  |  |  |  |  |  |  |
Business Acquisition And Dispositions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Disposal group, total value of consideration |  |  |  |  |  |  |  |  |  | 3,300,000,000 |
Disposal group, cash consideration |  |  |  |  |  |  |  |  |  | 2,000,000,000 |
Disposal group, indebtedness |  |  |  |  |  |  |  |  |  | 1,300,000,000 |
Disposal group, recognized a pre-tax gain (loss) |  |  | $ (35,000,000) |  |  |  |  |  |  |  |
Disposal group, gain (loss) recorded after tax |  |  | (31,000,000) |  |  |  |  |  |  |  |
Goodwill write-off |  |  | 700,000,000 |  |  |  |  |  |  |  |
Deferred taxes |  |  |  |  | 334,000,000 |  |  |  |  |  |
Deferred tax of classified held for sale |  |  | $ 16,000,000 |  |  |  |  |  |  |  |
Disposal group, transition services description |  |  | At the closing of the PSNC Transaction, Dominion Energy and Enbridge entered into a transition services agreement pursuant to which Dominion Energy will continue to provide certain services to support the ongoing operations of PSNC for up to approximately two years. Enbridge has also agreed to provide certain services to Dominion Energy. |  |  |  |  |  |  |  |
Questar Gas and Wexpro | Enbridge |  |  |  |  |  |  |  |  |  |  |
Business Acquisition And Dispositions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Disposal group, total value of consideration |  |  |  |  |  |  |  |  |  | 4,300,000,000 |
Disposal group, cash consideration |  |  |  |  |  |  |  |  |  | 3,000,000,000 |
Disposal group, indebtedness |  |  |  |  |  |  |  |  |  | $ 1,300,000,000 |
Disposal group, recognized a pre-tax gain (loss) | $ 78,000,000 |  | $ 2,000,000 |  | 236,000,000 |  |  |  |  |  |
Disposal group, gain (loss) recorded after tax | 78,000,000 |  | 42,000,000 |  | 231,000,000 |  |  |  |  |  |
Goodwill write-off |  |  | $ 700,000,000 |  |  |  |  |  |  |  |
Deferred taxes | 10,000,000 |  |  |  | 472,000,000 |  |  |  |  |  |
Income tax expense (benefit) | $ (5,000,000) |  |  |  |  |  |  |  |  |  |
Disposal group, transition services description |  |  | At the closing of the Questar Gas Transaction, Dominion Energy and Enbridge entered into a transition services agreement pursuant to which Dominion Energy will continue to provide certain services to support the ongoing operations of Questar Gas and Wexpro for up to approximately two years. Enbridge has also agreed to provide certain services to Dominion Energy. |  |  |  |  |  |  |  |
Impairment of goodwill |  |  |  |  | 236,000,000 |  |  |  |  |  |
Goodwill impairment after tax |  |  |  |  | $ 231,000,000 |  |  |  |  |  |
Other Sales | Tredegar Solar Fund I, LLC |  |  |  |  |  |  |  |  |  |  |
Business Acquisition And Dispositions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Disposal group, cash consideration |  |  |  |  |  |  |  |  |  |  | $ 21,000,000
Realizable fair value charge |  | $ 68,000,000 |  |  |  |  |  |  |  |  |
Realizable fair value charge net of tax |  | $ 51,000,000 |  |  |  |  |  |  |  |  |
Other Sales | Birdseye and Madison |  |  |  |  |  |  |  |  |  |  |
Business Acquisition And Dispositions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Disposal group, cash consideration |  |  |  |  |  |  |  |  | $ 17,000,000 |  |
[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.
[3] | 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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