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Investments (Selected Information Regarding Equity and Fixed Income Securities) (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Schedule of Available-for-sale Securities [Line Items] |  |  |
Proceeds from sales |  | $ 506 | $ 419
Realized gains | [1] | 43 | 36
Realized losses | [1] | 23 | 19
Virginia Electric and Power Company |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Proceeds from sales |  | 253 | 218
Realized gains | [1] | 10 | 18
Realized losses | [1] | $ 9 | $ 5
[1] | Includes realized gains and losses recorded to the nuclear decommissioning trust regulatory liability.

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