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Investments (Selected Information Regarding Equity and Fixed Income Securities) (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Proceeds from sales |  | $ 594 | $ 1,267 | $ 1,138 | $ 2,081
Realized gains | [1] | 22 | 75 | 43 | 115
Realized losses | [1] | 36 | 143 | 77 | 197
Virginia Electric and Power Company |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Proceeds from sales |  | 346 | 472 | 719 | 864
Realized gains | [1] | 8 | 10 | 25 | 26
Realized losses | [1] | $ 14 | $ 33 | $ 45 | $ 52
[1] | Includes realized gains and losses recorded to the nuclear decommissioning trust regulatory liability.

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