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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, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Proceeds from sales |  | $ 869 | $ 605 | $ 2,007 | $ 2,686
Realized gains | [1] | 5 | 17 | 48 | 132
Realized losses | [1] | 33 | 50 | 110 | 247
Virginia Electric and Power Company |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Proceeds from sales |  | 535 | 425 | 1,254 | 1,289
Realized gains | [1] | 4 | 14 | 29 | 40
Realized losses | [1] | $ 16 | $ 33 | $ 61 | $ 85
[1] | Includes realized gains and losses recorded to the nuclear decommissioning trust regulatory liability.

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