v3.25.2
Acquisitions and Dispositions (Business Review Dispositions) (Narrative) (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2025
 [1]
Jun. 30, 2024
Mar. 31, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Dec. 31, 2023
Apr. 30, 2024
Sep. 30, 2023
Business Acquisition And Dispositions [Line Items]                  
Income tax expense (benefit) $ 220 $ 112 [1]   $ 260 [2] $ 208 [2]        
Deferred income tax expense (benefit)       $ 192 $ (74)        
East Ohio | Enbridge                  
Business Acquisition And Dispositions [Line Items]                  
Disposal group, total value of consideration                 $ 6,600
Disposal group, cash consideration                 4,300
Disposal group, indebtedness                 2,300
Disposal group, recognized a pre-tax gain (loss)     $ (97)            
Disposal group, gain (loss) recorded after tax     (109)            
Goodwill write-off     1,500            
Deferred income tax expense (benefit)             $ 29    
Questar Gas and Wexpro | Enbridge                  
Business Acquisition And Dispositions [Line Items]                  
Disposal group, total value of consideration                 4,300
Disposal group, cash consideration                 3,000
Disposal group, indebtedness                 $ 1,300
Disposal group, recognized a pre-tax gain (loss)   (9) 78       236    
Disposal group, gain (loss) recorded after tax   $ 33 78       231    
Goodwill write-off           $ 700      
Income tax expense (benefit)     (5)            
Deferred income tax expense (benefit)     $ (10)       472    
PSNC | Enbridge                  
Business Acquisition And Dispositions [Line Items]                  
Deferred income tax expense (benefit)             $ 334    
Deferred tax of classified held for sale           $ 16      
Other Sales | Birdseye and Madison                  
Business Acquisition And Dispositions [Line Items]                  
Disposal group, cash consideration               $ 17  
[1] The significant expense categories and amounts in the segment information presented above align with the segment-level information that is regularly provided to Dominion Energy’s CODM.
[2] The significant expense categories and amounts in the segment information presented above align with the segment-level information that is regularly provided to Dominion Energy’s CODM.