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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
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Derivative Instruments Gain Loss [Line Items]        
Amount of Gain (Loss) Recognized in Income on Derivatives [1],[2] $ 125 $ (8) $ 501 $ 127
Virginia Electric and Power Company        
Derivative Instruments Gain Loss [Line Items]        
Amount of Gain (Loss) Recognized in Income on Derivatives [1],[2] (145) 58 (243) 111
Commodity Contract | Operating Revenue        
Derivative Instruments Gain Loss [Line Items]        
Amount of Gain (Loss) Recognized in Income on Derivatives [1],[2] 7 (306) 428 (908)
Commodity Contract | Operating Revenue | Virginia Electric and Power Company        
Derivative Instruments Gain Loss [Line Items]        
Amount of Gain (Loss) Recognized in Income on Derivatives [1],[2] 6 (108) 25 (237)
Commodity Contract | Purchased Gas        
Derivative Instruments Gain Loss [Line Items]        
Amount of Gain (Loss) Recognized in Income on Derivatives [1],[2] 0 1 0 5
Commodity Contract | Electric Fuel and Other Energy-Related Purchases        
Derivative Instruments Gain Loss [Line Items]        
Amount of Gain (Loss) Recognized in Income on Derivatives [1],[2] (149) 205 (267) 401
Commodity Contract | 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 [1],[2] (151) 166 (270) 348
Commodity Contract | Operation and maintenance        
Derivative Instruments Gain Loss [Line Items]        
Amount of Gain (Loss) Recognized in Income on Derivatives [1],[2] 0 0 2 0
Commodity Contract | Operation and maintenance | Virginia Electric and Power Company        
Derivative Instruments Gain Loss [Line Items]        
Amount of Gain (Loss) Recognized in Income on Derivatives [1],[2] 0 0 2 0
Commodity Contract | Discontinued operations        
Derivative Instruments Gain Loss [Line Items]        
Amount of Gain (Loss) Recognized in Income on Derivatives [1],[2] 0 0 94 1
Interest Rate Contract | Discontinued operations        
Derivative Instruments Gain Loss [Line Items]        
Amount of Gain (Loss) Recognized in Income on Derivatives [1],[2] (7) 89 17 257
Interest Rate Contract | Interest And Related Charges        
Derivative Instruments Gain Loss [Line Items]        
Amount of Gain (Loss) Recognized in Income on Derivatives [1],[2] $ 274 $ 3 $ 227 $ 371
[1] Excludes amounts related to foreign currency exchange rate derivatives that are deferred to plant under construction within property, plant and equipment and regulatory assets/liabilities that will begin to amortize once the CVOW Commercial Project is placed in service.
[2] Includes derivative activity amortized out of regulatory assets/liabilities. Amounts deferred into regulatory assets/liabilities have no associated effect in the Companies' Consolidated Statements of Income.