Leases - Lease Maturities (Details) $ in Millions	Mar. 31, 2019 USD ($)
Operating Leases
2019 (remaining 9 months)	$ 17
2020	18
2021	12
2022	8
2023	4
Thereafter	7
Total minimum lease payments	66
Less - amount representing interest	5
Present value of net minimum lease payments	61
Less - current portion of operating lease obligation	20
Long-term operating lease obligation	41
Finance Leases
2019 (remaining 9 months)	1
2020	0
2021	0
2022	0
2023	0
Thereafter	0
Total minimum lease payments	1
Less - amount representing interest	0
Present value of net minimum lease payments	1
Less - current portion of operating lease obligation	1
Long-term operating lease obligation	$ 0