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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, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Proceeds from sales |  | $ 651 | $ 869 | $ 2,230 | $ 2,007
Realized gains | [1] | 18 | 5 | 77 | 48
Realized losses | [1] | 21 | 33 | 93 | 110
Virginia Electric and Power Company |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Proceeds from sales |  | 297 | 535 | 1,370 | 1,254
Realized gains | [1] | 13 | 4 | 52 | 29
Realized losses | [1] | $ 16 | $ 16 | $ 61 | $ 61
[1] | Includes realized gains and losses recorded to the nuclear decommissioning trust regulatory liability.

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