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Preferred Stock (Narrative) (Detail) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Dec. 31, 2019
Dec. 15, 2024
Jun. 30, 2019
Jun. 14, 2019
Dec. 31, 2018
Class of Stock [Line Items]            
Preferred stock shares authorized 20,000,000 20,000,000        
Preferred Stock, Redemption Price Per Share $ 1,020 $ 1,020        
Series B preferred stock value issued $ 2,387 $ 2,387       $ 0
Dividend stock   $ 17        
Scenario, Forecast            
Class of Stock [Line Items]            
Preferred Stock, Redemption Price Per Share     $ 1,000      
2019 Corporate Units            
Class of Stock [Line Items]            
Percentage Of Interest In Undivided Beneficial Ownership       10.00%    
Total Long-term Debt         $ 1,600  
Series B Preferred Stock            
Class of Stock [Line Items]            
Preferred stock shares authorized 800,000 800,000        
Dividends Payable, Amount Per Share $ 1.9375 $ 1.9375        
Common Stock            
Class of Stock [Line Items]            
Purchase Price Per Share Under Stock Purchase Contract $ 50 $ 50        
Common Stock | 2019 Corporate Units            
Class of Stock [Line Items]            
Purchase Price Per Share Under Stock Purchase Contract         $ 100  
Virginia Electric and Power Company            
Class of Stock [Line Items]            
Preferred stock shares authorized 10,000,000 10,000,000       10,000,000
Preferred stock shares issued 0 0       0
Preferred stock shares outstanding 0 0       0
Liquidation preference (in dollars per share) $ 100 $ 100        
Dominion Energy            
Class of Stock [Line Items]            
Dividend rate percentage 2.993%          
Dividend stock   $ 2        
Dominion Energy | Preferred Class A            
Class of Stock [Line Items]            
Preferred stock shares issued 2,400,000 2,400,000        
Preferred stock shares outstanding 2,400,000 2,400,000        
Dominion Energy | Series A Preferred Stock            
Class of Stock [Line Items]            
Preferred stock shares issued 1,600,000 1,600,000        
Preferred stock shares outstanding 1,600,000 1,600,000        
Dominion Energy | Series B Preferred Stock            
Class of Stock [Line Items]            
Preferred stock shares issued 800,000 800,000        
Preferred stock shares outstanding 800,000 800,000        
Series B preferred stock value issued $ 791 $ 791        
Issuance of costs   9        
Preferred stock liquidation value $ 1,000 $ 1,000        
Dividend rate percentage   4.65%        
DESC            
Class of Stock [Line Items]            
Preferred stock shares authorized 20,000,000 20,000,000        
SCANA            
Class of Stock [Line Items]            
Preferred Stock Held By SCANA 1,000 1,000