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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 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]        
Income tax expense (benefit) from discontinued operations $ (2) $ 4 $ 4 $ 11
Net income attributable to Dominion Energy $ (1) 26 $ 18 54
Disposition of GTS Operations | Q-Pipe Group        
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]        
Operating revenue   59   126
Operating expense   9   28
Other income   1   1
Interest and related charges   5   10
Income before income taxes   46   89
Income tax expense (benefit) from discontinued operations   9   17
Net income attributable to Dominion Energy   $ 37   $ 72