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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.

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