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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, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Proceeds from sales |  | $ 1,267 | $ 945 | $ 2,081 | $ 2,710
Realized gains | [1] | 75 | 148 | 115 | 380
Realized losses | [1] | 143 | 15 | 197 | 74
Virginia Electric and Power Company |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Proceeds from sales |  | 472 | 460 | 864 | 1,249
Realized gains | [1] | 10 | 90 | 26 | 196
Realized losses | [1] | $ 33 | $ 3 | $ 52 | $ 26
[1] | Includes realized gains and losses recorded to the nuclear decommissioning trust regulatory liability.

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