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Commitments and Contingent Liabilities - Summary of Asbestos Claims Activity (Details) - Asbestos Related Product Liability $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 USD ($) claim | Dec. 31, 2017 USD ($) claim
Number of claims filed |  |
Pending claims, beginning of period | 54,300 | 64,400
New claims filed | 400 | 1,900
Claims settled/dismissed | (4,700) | (12,000)
Pending claims, end of period | 50,000 | 54,300
Payments | $ | $ 3 | $ 16

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