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Investments (Selected Information Regarding Marketable Equity and Debt Securities) (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2017 | Mar. 31, 2016
Available-for-sale securities: |  |  |
Proceeds from sales |  | $ 756 | $ 368
Realized gains | [1] | 94 | 25
Realized losses | [1] | 20 | 19
Virginia Electric and Power Company |  |  |
Available-for-sale securities: |  |  |
Proceeds from sales |  | 330 | 193
Realized gains | [2] | 45 | 12
Realized losses | [2] | $ 10 | $ 10
[1] | Includes realized gains and losses recorded to the nuclear decommissioning trust regulatory liability.
[2] | Includes realized gains and losses recorded to the nuclear decommissioning trust regulatory liability.

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