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Investments (Selected Information Regarding Equity and Fixed Income Securities) (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022
Schedule of Available-for-sale Securities [Line Items] |  |  |
Proceeds from sales |  | $ 544 | $ 814
Realized gains | [1] | 21 | 40
Realized losses | [1] | 41 | 54
Virginia Electric and Power Company |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Proceeds from sales |  | 373 | 392
Realized gains | [1] | 17 | 16
Realized losses | [1] | $ 31 | $ 19
[1] | Includes realized gains and losses recorded to the nuclear decommissioning trust regulatory liability.

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