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Acquisitions and Dispositions (Disposition of Gas Transmission & Storage Operations) (Narrative) (Detail) - Q-Pipe Group - Southwest Gas - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2022
Business Acquisition And Dispositions [Line Items] |  |
Gain (loss) on held for sale |  | $ 27
Gain (loss) on held for sale, after tax |  | 20
Transition Service Agreement |  |
Business Acquisition And Dispositions [Line Items] |  |
Operating revenue | $ 2 | $ 5
Disposal group, administrative services description |  | Dominion Energy will continue to provide specified administrative services to support the operations of the disposed businesses for up to 12 months after closing, subject to extension.

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