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Commitments and Contingencies (Nuclear Insurance) (Detail) $ in Millions | Dec. 31, 2017 USD ($)
--- | ---
Millstone |  |
Guarantor Obligations [Line Items] |  |
Property insurance coverage | $ 1,700 |
Kewaunee |  |
Guarantor Obligations [Line Items] |  |
Property insurance coverage | 1,060 |
Surry | Virginia Electric and Power Company |  |
Guarantor Obligations [Line Items] |  |
Property insurance coverage | 1,700 | [1]
North Anna | Virginia Electric and Power Company |  |
Guarantor Obligations [Line Items] |  |
Property insurance coverage | $ 1,700 | [1]
[1] | Surry and North Anna share a blanket property limit of $200 million.

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