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Goodwill and Intangible Assets (Goodwill) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Goodwill [Roll Forward]    
Goodwill, Beginning Balance [1] $ 4,143 $ 4,143
No events affecting goodwill 0 0
Goodwill, Ending Balance [1] 4,143 4,143
Operating Segments | Dominion Energy Virginia    
Goodwill [Roll Forward]    
Goodwill, Beginning Balance [1] 2,106 2,106
No events affecting goodwill 0 0
Goodwill, Ending Balance [1] 2,106 2,106
Operating Segments | Dominion Energy South Carolina    
Goodwill [Roll Forward]    
Goodwill, Beginning Balance [1] 1,521 1,521
No events affecting goodwill 0 0
Goodwill, Ending Balance [1] 1,521 1,521
Operating Segments | Contracted Energy    
Goodwill [Roll Forward]    
Goodwill, Beginning Balance [1] 516 516
No events affecting goodwill 0 0
Goodwill, Ending Balance [1] 516 516
Operating Segments | Corporate and Other    
Goodwill [Roll Forward]    
Goodwill, Beginning Balance [1] 0 0
No events affecting goodwill 0 0
Goodwill, Ending Balance [1] $ 0 $ 0
[1] Goodwill amounts do not contain any accumulated impairment losses.