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Investments (Portion of Unrealized Gains and Losses Relates to Equity Securities) (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Debt Securities, Available-for-Sale [Line Items]        
Net gains (losses) recognized during the period $ 458 $ 282 $ 754 $ 919
Less: Net (gains) losses recognized during the period on securities sold during the period (1) 5 15 1
Unrealized gains (losses) recognized during the period on securities still held at period end [1] 457 287 769 920
Virginia Electric and Power Company        
Debt Securities, Available-for-Sale [Line Items]        
Net gains (losses) recognized during the period 236 145 389 473
Less: Net (gains) losses recognized during the period on securities sold during the period 0 3 11 (2)
Unrealized gains (losses) recognized during the period on securities still held at period end [2] $ 236 $ 148 $ 400 $ 471
[1] Included in other income (expense) and the nuclear decommissioning trust regulatory liabilities.
[2] Included in other income (expense) and the nuclear decommissioning trust regulatory liabilities.