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Commitments and Contingencies (Nuclear Insurance) (Details) | Dec. 31, 2016 USD ($)
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Millstone |  |
Guarantor Obligations [Line Items] |  |
Property insurance coverage | $ 1,700,000 |
Kewaunee |  |
Guarantor Obligations [Line Items] |  |
Property insurance coverage | 1,060,000 |
Surry | Virginia Electric and Power Company |  |
Guarantor Obligations [Line Items] |  |
Property insurance coverage | 1,700,000 | [1]
North Anna | Virginia Electric and Power Company |  |
Guarantor Obligations [Line Items] |  |
Property insurance coverage | 1,700,000 | [1]
Surry and North Anna |  |
Guarantor Obligations [Line Items] |  |
Coverage amount | $ 200,000,000 |
[1] | Surry and North Anna share a blanket property limit of $200 million.

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