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Operating Revenue (Schedule of Operating Revenue) (Parenthetical) (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Public Utilities General Disclosures [Line Items]        
Operating revenue from contracts with customers $ 3,794 $ 3,084 $ 8,341 $ 6,924
Other revenues [1],[2] (198) (46) (466) (16)
GT&S Transaction        
Public Utilities General Disclosures [Line Items]        
Revenue associated with discontinued operations   1   2
NGL Midstream | Transferred at a Point in Time        
Public Utilities General Disclosures [Line Items]        
Operating revenue from contracts with customers 14 8 25 15
Renewable Energy Investment Tax Credits        
Public Utilities General Disclosures [Line Items]        
Operating revenue from contracts with customers 7 7 11 13
Alternative Revenue Programs        
Public Utilities General Disclosures [Line Items]        
Other revenues 40 25 70 47
Virginia Electric and Power Company        
Public Utilities General Disclosures [Line Items]        
Operating revenue from contracts with customers 2,239 1,723 4,435 3,530
Other revenues [1],[3] (64) 18 (93) 41
Virginia Electric and Power Company | Renewable Energy Investment Tax Credits        
Public Utilities General Disclosures [Line Items]        
Operating revenue from contracts with customers   5   9
Virginia Electric and Power Company | Alternative Revenue Programs        
Public Utilities General Disclosures [Line Items]        
Other revenues 19 $ 18 27 $ 38
Virginia Electric and Power Company | Maximum | Renewable Energy Investment Tax Credits        
Public Utilities General Disclosures [Line Items]        
Operating revenue from contracts with customers $ 1   $ 1  
[1] Includes alternative revenue of $40 million and $25 million at Dominion Energy and $19 million and $18 million at Virginia Power for the three months ended June 30, 2022 and 2021, respectively, and $70 million and $47 million at Dominion Energy and $27 million and $38 million at Virginia Power for the six months ended June 30, 2022 and 2021, respectively.
[2] Includes revenue associated with services provided to discontinued operations of $1 million and $2 million for the three and six months ended June 30, 2021, respectively.
[3] See Note 19 for amounts attributable to affiliates.