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Asbestos-Related Liabilities (Summary of Percentage of Outstanding Claims Related to Claimants Alleging Serious Diseases) (Details) | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Total claims |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |
Claims alleging serious diseases, percentage | 22.00% | 22.00% | 22.00%
Pre-1964 claims in states without asbestos legislation |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |
Claims alleging serious diseases, percentage | 41.00% | 41.00% | 41.00%

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- Definition Percentage of asbestos-related claims alleging serious diseases outstanding as of the balance sheet date. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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- Details
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