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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, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Derivative Instruments Gain Loss [Line Items]        
Amount of Gain (Loss) Recognized in Income on Derivatives [1],[2] $ 71 $ 199 $ 150 $ (46)
Virginia Electric and Power Company        
Derivative Instruments Gain Loss [Line Items]        
Amount of Gain (Loss) Recognized in Income on Derivatives [1],[2] 87 30 169 (81)
Commodity | Operating Revenue        
Derivative Instruments Gain Loss [Line Items]        
Amount of Gain (Loss) Recognized in Income on Derivatives [1],[2] (31) 123 (47) 184
Commodity | Operating Revenue | Virginia Electric and Power Company        
Derivative Instruments Gain Loss [Line Items]        
Amount of Gain (Loss) Recognized in Income on Derivatives [1],[2] (8) 31 (27) 107
Commodity | Purchased Gas        
Derivative Instruments Gain Loss [Line Items]        
Amount of Gain (Loss) Recognized in Income on Derivatives [1],[2] (1) 0 (1) 0
Commodity | Electric Fuel and Other Energy-Related Purchases        
Derivative Instruments Gain Loss [Line Items]        
Amount of Gain (Loss) Recognized in Income on Derivatives [1],[2] 102 2 207 (188)
Commodity | 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] 95 (1) 196 (188)
Commodity | Discontinued operations        
Derivative Instruments Gain Loss [Line Items]        
Amount of Gain (Loss) Recognized in Income on Derivatives [1],[2] 0 (3) 0 (28)
Interest Rate Contract | Interest And Related Charges        
Derivative Instruments Gain Loss [Line Items]        
Amount of Gain (Loss) Recognized in Income on Derivatives [1],[2] $ 1 $ 77 $ (9) $ (14)
[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.