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Investments (Selected Information Regarding Equity and Fixed Income Securities) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Proceeds from sales |  | $ 3,072 | $ 2,966 | $ 3,282
Realized gains | [1] | 106 | 92 | 143
Realized losses | [1] | 128 | 169 | 296
Virginia Electric and Power Company |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Proceeds from sales |  | 1,925 | 1,876 | 1,538
Realized gains | [1] | 67 | 50 | 48
Realized losses | [1] | $ 88 | $ 99 | $ 107
[1] | Includes realized gains and losses recorded to the nuclear decommissioning trust regulatory liability as discussed in Note 2.

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