Leases (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Leases [Abstract]
Operating leases	$ 24	$ 22
Short-term leases	0	4
Lease expense	24	26
Less: sublease income	0	0
Net lease cost	24	26
Cash payments to settle a lease liability reported in cash flows	27	24
Right-of-use assets obtained in exchange for new lease liabilities	$ 14	$ 8
Weighted average discount rate (percent)	2.97%	3.07%
Weighted average remaining lease term (in years)	5 years	5 years 2 months 12 days