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Acquisitions and Dispositions (Disposition of Gas Transmission & Storage Operations) (Narrative) (Detail) - Q-Pipe Group - Southwest Gas $ in Millions | 3 Months Ended
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Mar. 31, 2022 USD ($)
Business Acquisition And Dispositions [Line Items] |
Gain (loss) on held for sale | $ 27,000
Gain (loss) on held for sale, after tax | 20,000
Transition Service Agreement |
Business Acquisition And Dispositions [Line Items] |
Operating revenue | $ 1
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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