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Goodwill and Intangible Assets (Goodwill) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Goodwill [Roll Forward]    
Goodwill, Beginning Balance [1] $ 6,410 $ 6,405
Purchase Accounting Adjustment   5
SCANA Combination [2] 2,609  
Contribution of SEMI to Wrangler [3] (73)  
Goodwill, Ending Balance [1] 8,946 6,410
Dominion Energy Gas Holdings, LLC    
Goodwill [Roll Forward]    
Goodwill, Beginning Balance [1] 1,471 1,466
Purchase Accounting Adjustment   5
No events affecting goodwill 0  
Goodwill, Ending Balance [1] 1,471 1,471
Dominion Energy Gas Holdings, LLC | Dominion Energy Virginia    
Goodwill [Roll Forward]    
No events affecting goodwill 0  
Dominion Energy Gas Holdings, LLC | Gas & Transportation    
Goodwill [Roll Forward]    
Goodwill, Beginning Balance [1] 1,471 1,466
Purchase Accounting Adjustment   5
No events affecting goodwill 0  
Goodwill, Ending Balance [1] 1,471 1,471
Dominion Energy Gas Holdings, LLC | Gas Distribution    
Goodwill [Roll Forward]    
No events affecting goodwill 0  
Dominion Energy Gas Holdings, LLC | Dominion Energy South Carolina [Member]    
Goodwill [Roll Forward]    
No events affecting goodwill 0  
Dominion Energy Gas Holdings, LLC | Contracted Generation    
Goodwill [Roll Forward]    
No events affecting goodwill 0  
Dominion Energy Gas Holdings, LLC | Corporate and Other    
Goodwill [Roll Forward]    
No events affecting goodwill 0  
Operating Segments | Dominion Energy Virginia    
Goodwill [Roll Forward]    
Goodwill, Beginning Balance [1] 2,106 2,106
Goodwill, Ending Balance [1] 2,106 2,106
Operating Segments | Gas & Transportation    
Goodwill [Roll Forward]    
Goodwill, Beginning Balance [1] 1,565 1,561
Purchase Accounting Adjustment   4
SCANA Combination [2] 73  
Contribution of SEMI to Wrangler [3] (73)  
Goodwill, Ending Balance [1] 1,565 1,565
Operating Segments | Gas Distribution    
Goodwill [Roll Forward]    
Goodwill, Beginning Balance [1] 2,497 2,496
Purchase Accounting Adjustment   1
SCANA Combination [2] 1,015  
Goodwill, Ending Balance [1] 3,512 2,497
Operating Segments | Dominion Energy South Carolina [Member]    
Goodwill [Roll Forward]    
SCANA Combination [2] 1,521  
Goodwill, Ending Balance [1] 1,521  
Operating Segments | Contracted Generation    
Goodwill [Roll Forward]    
Goodwill, Beginning Balance [1] 242 242
Goodwill, Ending Balance [1] $ 242 $ 242
[1] Goodwill amounts do not contain any accumulated impairment losses.
[2] See Note 3 for discussion of Dominion Energy’s acquisitions.
[3] See Note 9 for additional information.