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Investments (Selected Information Regarding Equity and Fixed Income Securities) (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Schedule of Available-for-sale Securities [Line Items]        
Proceeds from sales $ 869 $ 651 $ 2,563 $ 2,230
Realized gains [1] 18 18 36 77
Realized losses [1] 15 21 57 93
Virginia Electric and Power Company        
Schedule of Available-for-sale Securities [Line Items]        
Proceeds from sales 489 297 1,412 1,370
Realized gains [2] 12 13 26 52
Realized losses [2] $ 11 $ 16 $ 40 $ 61
[1] Includes realized gains and losses recorded to the nuclear decommissioning trust regulatory liabilities.
[2] Includes realized gains and losses recorded to the nuclear decommissioning trust regulatory liabilities.