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Asbestos-Related Liabilities (Summary of Asbestos Claims Cash Payments by Company) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Liability for Asbestos and Environmental Claims [Abstract]
Asbestos-related payments	$ 3	$ 21	$ 30	$ 30
Settled claims payments (included in asbestos-related payments above)		$ 15	$ 24	$ 23

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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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Namespace Prefix:	us-gaap_
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X

- 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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 40
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=99382578&loc=d3e14764-158437

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