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Investments (Selected Information Regarding Equity and Fixed Income Securities) (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Schedule of Available-for-sale Securities [Line Items] |  |  |
Proceeds from sales |  | $ 695 | $ 544
Realized gains | [1] | 32 | 21
Realized losses | [1] | 38 | 41
Virginia Electric and Power Company |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Proceeds from sales |  | 471 | 373
Realized gains | [1] | 23 | 17
Realized losses | [1] | $ 23 | $ 31
[1] | Includes realized gains and losses recorded to the nuclear decommissioning trust regulatory liability.

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