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Derivatives and Hedge Accounting Activities (Schedule of Derivatives not Designated as Hedging Instruments) (Detail) - Derivatives Not Designated as Hedging Instruments - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Derivative Instruments Gain Loss [Line Items]      
Amount of Gain (Loss) Recognized in Income on Derivatives [1] $ (375) $ 42 $ (26)
Virginia Electric and Power Company      
Derivative Instruments Gain Loss [Line Items]      
Amount of Gain (Loss) Recognized in Income on Derivatives [2] (53) (104) (45)
Operating Revenue | Virginia Electric and Power Company      
Derivative Instruments Gain Loss [Line Items]      
Amount of Gain (Loss) Recognized in Income on Derivatives [2] (62) (104) (45)
Electric Fuel and Other Energy-Related Purchases | Virginia Electric and Power Company      
Derivative Instruments Gain Loss [Line Items]      
Amount of Gain (Loss) Recognized in Income on Derivatives [2] 9    
Commodity | Operating Revenue      
Derivative Instruments Gain Loss [Line Items]      
Amount of Gain (Loss) Recognized in Income on Derivatives [1] (487) 73 41
Commodity | Purchased Gas      
Derivative Instruments Gain Loss [Line Items]      
Amount of Gain (Loss) Recognized in Income on Derivatives [1] (1) (20) (22)
Commodity | Electric Fuel and Other Energy-Related Purchases      
Derivative Instruments Gain Loss [Line Items]      
Amount of Gain (Loss) Recognized in Income on Derivatives [1] 16 (104) (46)
Commodity | Discontinued operations      
Derivative Instruments Gain Loss [Line Items]      
Amount of Gain (Loss) Recognized in Income on Derivatives [1]   (11) (2)
Interest rate | Discontinued operations      
Derivative Instruments Gain Loss [Line Items]      
Amount of Gain (Loss) Recognized in Income on Derivatives [1]   5  
Interest rate | Interest and Related Charges      
Derivative Instruments Gain Loss [Line Items]      
Amount of Gain (Loss) Recognized in Income on Derivatives [1] $ 97 87 $ 3
Foreign currency exchange rate | Discontinued operations      
Derivative Instruments Gain Loss [Line Items]      
Amount of Gain (Loss) Recognized in Income on Derivatives [1]   $ 12  
[1] Includes derivative activity amortized out of regulatory assets/liabilities. Amounts deferred into regulatory assets/liabilities have no associated effect in Dominion Energy’s Consolidated Statements of Income.
[2] Includes derivative activity amortized out of regulatory assets/liabilities. Amounts deferred into regulatory assets/liabilities have no associated effect in Virginia Power’s Consolidated Statements of Income.