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Operating Segments (Narrative) (Detail) - Operating Segment - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Corporate and Other      
Segment Reporting Information [Line Items]      
After- tax net benefits (expenses) $ 18 $ (3) $ (212)
Dominion Energy South Carolina, Inc. [Member]      
Segment Reporting Information [Line Items]      
After- tax net benefits (expenses)     (208)
Litigation settlement expense     70
Litigation settlement expense, after tax     53
Benefit related to real estate transactions 28    
Benefit related to real estate transactions, after tax $ 21    
South Carolina Electric Base Rate Case      
Segment Reporting Information [Line Items]      
Settlement charges     266
Settlement charges net of tax     $ 199