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Investments (Selected Information Regarding Equity and Fixed Income Securities) (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Schedule of Available-for-sale Securities [Line Items] |  |  |
Proceeds from sales |  | $ 602 | $ 506
Realized gains | [1] | 66 | 43
Realized losses | [1] | 69 | 23
Virginia Electric and Power Company |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Proceeds from sales |  | 294 | 253
Realized gains | [1] | 31 | 10
Realized losses | [1] | $ 31 | $ 9
[1] | Includes realized gains and losses recorded to the nuclear decommissioning trust regulatory liability.

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