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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, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Proceeds from sales |  | $ 376 | $ 425 | $ 882 | $ 844
Realized gains | [1] | 56 | 36 | 99 | 72
Realized losses | [1] | 27 | 23 | 50 | 42
Virginia Electric and Power Company |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Proceeds from sales |  | 194 | 196 | 447 | 414
Realized gains | [1] | 15 | 15 | 25 | 33
Realized losses | [1] | $ 3 | $ 7 | $ 12 | $ 12
[1] | Includes realized gains and losses recorded to the nuclear decommissioning trust regulatory liability.

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