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Acquisitions and Dispositions (Business Review Dispositions) (Narrative) (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023 | Feb. 29, 2024
Business Acquisition And Dispositions [Line Items] |  |  |  |  |  |  |  |
Income tax expense (benefit) | $ 183 |  |  | $ 195 | $ 412 | $ 469 |  |
Deferred income tax expense (benefit) |  |  |  |  | (274) | 1,439 |  |
East Ohio | Enbridge |  |  |  |  |  |  |  |
Business Acquisition And Dispositions [Line Items] |  |  |  |  |  |  |  |
Disposal group, total value of consideration |  |  |  | 6,600 |  | 6,600 |  |
Disposal group, cash consideration |  |  |  | 4,300 |  | 4,300 |  |
Disposal group, indebtedness |  |  |  | 2,300 |  | 2,300 |  |
Disposal group, recognized a pre-tax loss |  |  |  |  | 102 |  |  |
Disposal group, loss recorded after tax |  |  |  |  | 113 |  |  |
Goodwill write-off |  |  |  |  | $ 1,500 |  |  |
Deferred income tax expense (benefit) |  |  |  |  |  |  | $ 29 |
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. |  |  |
PSNC | Enbridge |  |  |  |  |  |  |  |
Business Acquisition And Dispositions [Line Items] |  |  |  |  |  |  |  |
Disposal group, total value of consideration |  |  |  | 3,300 |  | 3,300 |  |
Disposal group, cash consideration |  |  |  | 2,000 |  | 2,000 |  |
Disposal group, indebtedness |  |  |  | 1,300 |  | 1,300 |  |
Disposal group, recognized a pre-tax loss |  |  |  |  | $ 33 |  |  |
Disposal group, loss recorded after tax |  |  |  |  | 30 |  |  |
Goodwill write-off |  |  |  |  | 700 |  |  |
Deferred tax of classified held for sale |  |  |  |  | $ 16 |  | 334 |
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 |  | 4,300 |  |
Disposal group, cash consideration |  |  |  | 3,000 |  | 3,000 |  |
Disposal group, indebtedness |  |  |  | $ 1,300 |  | $ 1,300 |  |
Disposal group, recognized a pre-tax loss |  | $ 78 |  |  | $ 30 |  | 284 |
Disposal group, loss recorded after tax |  | 78 |  |  | 18 |  | 279 |
Goodwill write-off |  |  |  |  | $ 700 |  |  |
Income tax expense (benefit) |  | (5) |  |  |  |  |  |
Deferred income tax expense (benefit) |  | $ 22 |  |  |  |  | $ 462 |
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. |  |  |
Other Sales | Tredegar Solar Fund I, LLC |  |  |  |  |  |  |  |
Business Acquisition And Dispositions [Line Items] |  |  |  |  |  |  |  |
Realizable fair value charge net of tax |  |  | $ 68 |  |  |  |  |
Realizable fair value charge net of tax |  |  | $ 51 |  |  |  |  |
Other Sales | Birdseye and Madison [Member] |  |  |  |  |  |  |  |
Business Acquisition And Dispositions [Line Items] |  |  |  |  |  |  |  |
Disposal group, cash consideration |  |  |  |  |  |  |  | $ 17

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