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