Commitments and Contingent Liabilities - Asbestos Claims Activity (Details) - Asbestos Related Product Liability $ in Millions	12 Months Ended
	Dec. 31, 2017 USD ($) claim	Dec. 31, 2016 USD ($) claim	Dec. 31, 2015 USD ($) claim
Number of claims filed
Pending claims, beginning of year (in claims)	64,400	67,400	73,800
New claims filed during the year (in claims)	1,900	1,900	1,900
Claims settled/dismissed during the year (in claims)	(12,000)	(4,900)	(8,300)
Pending claims, end of year (in claims)	54,300	64,400	67,400
Claim payments | $	$ 16	$ 20	$ 19