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
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Claims alleging serious diseases	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	41.00%	41.00%	41.00%

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.

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