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Investments (Selected Information Regarding Equity and Fixed Income Securities) (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Proceeds from sales |  | $ 763 | $ 884 | $ 1,694 | $ 1,579
Realized gains | [1] | 7 | 27 | 18 | 59
Realized losses | [1] | 22 | 34 | 42 | 72
Virginia Electric and Power Company |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Proceeds from sales |  | 355 | 602 | 923 | 1,073
Realized gains | [2] | 5 | 16 | 14 | 39
Realized losses | [2] | $ 14 | $ 22 | $ 29 | $ 45
[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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