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Acquisitions and Dispositions (Business Review Dispositions) (Narrative) (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Feb. 29, 2024
Business Acquisition And Dispositions [Line Items]                
Income tax expense (benefit) $ 183     $ 195 $ 412 $ 469    
Deferred income tax expense (benefit)         (274) 1,439    
East Ohio | Enbridge                
Business Acquisition And Dispositions [Line Items]                
Disposal group, total value of consideration       6,600   6,600    
Disposal group, cash consideration       4,300   4,300    
Disposal group, indebtedness       2,300   2,300    
Disposal group, recognized a pre-tax loss         102      
Disposal group, loss recorded after tax         113      
Goodwill write-off         $ 1,500      
Deferred income tax expense (benefit)             $ 29  
Disposal group, transition services description         At the closing of the East Ohio Transaction, Dominion Energy and Enbridge entered into a transition services agreement pursuant to which Dominion Energy will continue to provide certain services to support the ongoing operations of East Ohio for up to approximately two years. Enbridge has also agreed to provide certain services to Dominion Energy.      
PSNC | Enbridge                
Business Acquisition And Dispositions [Line Items]                
Disposal group, total value of consideration       3,300   3,300    
Disposal group, cash consideration       2,000   2,000    
Disposal group, indebtedness       1,300   1,300    
Disposal group, recognized a pre-tax loss         $ 33      
Disposal group, loss recorded after tax         30      
Goodwill write-off         700      
Deferred tax of classified held for sale         $ 16   334  
Disposal group, transition services description         At the closing of the PSNC Transaction, Dominion Energy and Enbridge entered into a transition services agreement pursuant to which Dominion Energy will continue to provide certain services to support the ongoing operations of PSNC for up to approximately two years. Enbridge has also agreed to provide certain services to Dominion Energy.      
Questar Gas and Wexpro | Enbridge                
Business Acquisition And Dispositions [Line Items]                
Disposal group, total value of consideration       4,300   4,300    
Disposal group, cash consideration       3,000   3,000    
Disposal group, indebtedness       $ 1,300   $ 1,300    
Disposal group, recognized a pre-tax loss   $ 78     $ 30   284  
Disposal group, loss recorded after tax   78     18   279  
Goodwill write-off         $ 700      
Income tax expense (benefit)   (5)            
Deferred income tax expense (benefit)   $ 22         $ 462  
Disposal group, transition services description         At the closing of the Questar Gas Transaction, Dominion Energy and Enbridge entered into a transition services agreement pursuant to which Dominion Energy will continue to provide certain services to support the ongoing operations of Questar Gas and Wexpro for up to approximately two years. Enbridge has also agreed to provide certain services to Dominion Energy.      
Other Sales | Tredegar Solar Fund I, LLC                
Business Acquisition And Dispositions [Line Items]                
Realizable fair value charge net of tax     $ 68          
Realizable fair value charge net of tax     $ 51          
Other Sales | Birdseye and Madison [Member]                
Business Acquisition And Dispositions [Line Items]                
Disposal group, cash consideration               $ 17