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Investments (Selected Information Regarding Equity and Fixed Income Securities) (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Proceeds from sales |  | $ 429 | $ 457 | $ 1,311 | $ 1,301
Realized gains | [1] | 53 | 24 | 152 | 96
Realized losses | [1] | 25 | 18 | 75 | 60
Virginia Electric and Power Company |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Proceeds from sales |  | 230 | 237 | 677 | 651
Realized gains | [1] | 21 | 11 | 46 | 44
Realized losses | [1] | $ 6 | $ 5 | $ 18 | $ 17
[1] | Includes realized gains and losses recorded to the nuclear decommissioning trust regulatory liability.

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