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Asbestos-Related Liabilities (Summary of Percentage of Outstanding Claims Related to Claimants Alleging Serious Diseases) (Details)	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Total claims
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Claims alleging serious diseases, percentage	23.00%	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.

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No definition available.

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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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