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Investments (Selected Information Regarding Marketable Equity and Debt Securities) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Available-for-sale securities: |  |  |  |
Proceeds from sales |  | $ 1,422 | $ 1,340 | $ 1,235
Realized gains | [1] | 128 | 219 | 171
Realized losses | [1] | 55 | 84 | 30
Virginia Electric and Power Company |  |  |  |
Available-for-sale securities: |  |  |  |
Proceeds from sales |  | 733 | 639 | 549
Realized gains | [2] | 63 | 110 | 73
Realized losses | [2] | $ 27 | $ 43 | $ 12
[1] | Includes realized gains and losses recorded to the nuclear decommissioning trust regulatory liability as discussed in Note 2.
[2] | Includes realized gains and losses recorded to the nuclear decommissioning trust regulatory liability as discussed in Note 2.

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