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Acquisitions and Dispositions - (Schedule of Results of Operations of Disposal Groups Reported As Discontinued Operations) (Parenthetical) (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Income tax expense (benefit) $ (10) $ 1,200 $ 22 $ 1,300
Impairment of assets and other charges 122 1 219 136
East Ohio, PSNC and Questar Gas        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Income tax expense (benefit) $ 2 6 (71) 2
East Ohio | Enbridge        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Income tax expense (benefit)   $ 39 [1] 9 [2] $ 58 [1]
Employee benefit plans     45  
Employee benefit plans after tax     33  
Other Sales        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Income tax expense (benefit)     0  
Other Sales | Nonregulated Solar Generation Facility        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Impairment of assets and other charges     15  
Impairment of assets and other charges after tax     $ 11  
[1] Includes amounts recorded in the third quarter of 2023 to reflect the recognition of deferred taxes on the outside basis of the applicable entities’ stock upon meeting the classification as held for sale.
[2] Represents amounts attributable to Dominion Energy prior to the closing of the East Ohio Transaction which closed on March 6, 2024, the PSNC Transaction which closed on September 30, 2024 and the Questar Gas Transaction which closed on May 31, 2024.