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Preferred Stock (Narrative) (Detail) - USD ($)
 1 Months Ended 12 Months Ended
Jun. 30, 2022
Dec. 31, 2021
Dec. 31, 2019
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Apr. 15, 2027
Dec. 15, 2024
Jun. 30, 2019
Jun. 14, 2019
Class of Stock [Line Items]                    
Preferred stock shares authorized   20,000,000   20,000,000            
Stock issued during period for acquisition, value           $ 6,818,000,000        
Total Preferred Stock   $ 1,783,000,000   $ 1,783,000,000 $ 2,387,000,000          
Dividend stock       68,000,000 $ 65,000,000 17,000,000        
Common Stock                    
Class of Stock [Line Items]                    
Stock issued during period for acquisition, value           6,818,000,000        
Defined Benefit Pension plans           $ 499,000,000        
2019 Series A Corporate Units                    
Class of Stock [Line Items]                    
Principal amount corporate units                   $ 1,600,000,000
Percentage of interest in undivided beneficial ownership                 10.00%  
2019 Series A Corporate Units | Forecast                    
Class of Stock [Line Items]                    
Stock issued during period for acquisition, value $ 1,600,000,000                  
2019 Series A Corporate Units | Forecast | Maximum                    
Class of Stock [Line Items]                    
Shares to be issued under purchase contracts 21,800,000                  
2019 Series A Corporate Units | Common Stock                    
Class of Stock [Line Items]                    
Purchase price to be paid under stock purchase contracts                   $ 100
Series A Preferred Stock                    
Class of Stock [Line Items]                    
Reclassifications of permanent to mezzanine equity       $ 1,600,000,000            
Conversion of stock, description       Series A Preferred Stock be settled, at Dominion Energy’s election, either entirely in cash or in cash up to the first $1,000 per share and in shares of Dominion Energy common stock, cash or any combination thereof for any amounts in excess of $1,000 per share.            
Series B Preferred Stock                    
Class of Stock [Line Items]                    
Preferred stock, redemption price per share     $ 1,020     $ 1,020        
Series B Preferred Stock | Forecast                    
Class of Stock [Line Items]                    
Preferred stock, redemption price per share               $ 1,000    
Series C Preferred Stock                    
Class of Stock [Line Items]                    
Preferred stock, redemption price per share   $ 1,020   $ 1,020            
Series C Preferred Stock | Forecast                    
Class of Stock [Line Items]                    
Preferred stock, redemption price per share             $ 1,000      
Dominion Energy                    
Class of Stock [Line Items]                    
Dividend rate percentage   3.195% 2.993%              
Dominion Energy | Preferred Class A                    
Class of Stock [Line Items]                    
Preferred stock shares issued   3,400,000   3,400,000 2,400,000          
Preferred stock shares outstanding   3,400,000   3,400,000 2,400,000          
Dominion Energy | Series A Preferred Stock                    
Class of Stock [Line Items]                    
Preferred stock shares issued   1,600,000   1,600,000 1,600,000          
Preferred stock shares outstanding   1,600,000   1,600,000 1,600,000          
Dominion Energy | Series B Preferred Stock                    
Class of Stock [Line Items]                    
Preferred stock shares issued   800,000 800,000 800,000 800,000 800,000        
Preferred stock shares outstanding   800,000   800,000 800,000          
Total Preferred Stock     $ 791,000,000     $ 791,000,000        
Issuance of costs     9,000,000              
Preferred stock liquidation value     $ 1,000     $ 1,000        
Dividend rate percentage     4.65%              
Dividend stock       $ 37,000,000 $ 37,000,000          
Dividends per share       $ 46.50 $ 46.50          
Dominion Energy | Series C Preferred Stock                    
Class of Stock [Line Items]                    
Preferred stock shares issued   1,000,000.0   1,000,000.0            
Preferred stock shares outstanding   1,000,000.0   1,000,000.0            
Issuance of costs   $ 8,000,000                
Preferred stock liquidation value   $ 1,000   $ 1,000            
Dividend rate percentage   4.35%                
Dividend stock       $ 3,000,000            
Dividends per share       $ 2.6583            
Preferred stock shares issued to public   750,000                
Preferred stock value issued to public   $ 742,000,000                
Issuance of shares to qualified benefit pension plan   250,000                
Defined Benefit Pension plans   $ 250,000,000                
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 1,000          
Virginia Electric and Power Company                    
Class of Stock [Line Items]                    
Preferred stock shares authorized   10,000,000   10,000,000            
Preferred stock shares issued   0   0 0          
Preferred stock shares outstanding   0   0 0          
Liquidation preference   $ 100   $ 100