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Investments (Selected Information Regarding Equity and Fixed Income Securities) (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Proceeds from sales |  | $ 3,282 | $ 3,985 | $ 4,278
Realized gains | [1] | 143 | 441 | 340
Realized losses | [1] | 296 | 91 | 297
Virginia Electric and Power Company |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Proceeds from sales |  | 1,538 | 1,791 | 884
Realized gains | [1] | 48 | 228 | 88
Realized losses | [1] | $ 107 | $ 35 | $ 68
[1] | Includes realized gains and losses recorded to the nuclear decommissioning trust regulatory liability as discussed in Note 2.

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