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Asbestos-Related Liabilities (Summary of Asbestos Claims Cash Payments by Company) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Liability for Asbestos and Environmental Claims [Abstract] |  |  |
Asbestos-related payments | $ 30 | $ 30 | $ 30
Settled claims payments (included in asbestos-related payments above) | $ 24 | $ 23 | $ 22

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- Definition Liability for asbestos and environmental claims, net, claims settled + References No definition available. + Details
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- References No definition available. + Details
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- Definition Amount, after effects of reinsurance, of payments to settle insured claims and pay costs incurred in the claims settlement process attributable to asbestos and environmental claims. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=65670824&loc=d3e14764-158437 + Details
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