Leases - Supplemental Balance Sheet (Details) $ in Millions	Dec. 31, 2019 USD ($)
Assets
Operating lease assets	$ 105
Finance lease assets	14
Total leased assets	119
Current
Operating	29
Finance	5
Noncurrent
Operating	89
Finance	5
Total lease liabilities	$ 128
Weighted-average remaining lease term (years)
Operating leases	5 years 3 months 18 days
Finance leases	5 years 3 months 18 days
Weighted-average discount rate
Operating leases	6.08%
Finance leases	5.55%