Commitments and Contingent Liabilities - Asbestos Claims Activity (Details) - Asbestos Related Product Liability $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2020 USD ($) claim	Dec. 31, 2019 USD ($) claim
Number of claims filed
Pending claims, beginning of period	39,600	43,100
New claims filed	300	1,500
Claims settled/dismissed	(700)	(5,000)
Pending claims, end of period	39,200	39,600
Payments | $	$ 2	$ 22