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Acquisitions and Dispositions (Schedule of Results of Operations of Disposal Groups Reported As Discontinued Operations) (Detail) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |
Income tax expense (benefit) from discontinued operations | $ 6 | $ 7
Net income attributable to Dominion Energy | $ 19 | 28
Disposition of GTS Operations | Q-Pipe Group |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |
Operating revenue |  | 67
Operating expense |  | 19
Interest and related charges |  | 5
Income before income taxes |  | 43
Income tax expense (benefit) from discontinued operations |  | 8
Net income attributable to Dominion Energy |  | $ 35

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