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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, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Proceeds from sales |  | $ 1,058 | $ 376 | $ 1,660 | $ 882
Realized gains | [1] | 74 | 56 | 140 | 99
Realized losses | [1] | 61 | 27 | 130 | 50
Virginia Electric and Power Company |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Proceeds from sales |  | 236 | 194 | 530 | 447
Realized gains | [1] | 24 | 15 | 55 | 25
Realized losses | [1] | $ 17 | $ 3 | $ 48 | $ 12
[1] | Includes realized gains and losses recorded to the nuclear decommissioning trust regulatory liability.

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