Leases - Maturities of Lease Liabilities (Details) $ in Millions	Dec. 31, 2019 USD ($)
Operating Leases
2020	$ 32
2021	30
2022	26
2023	21
2024	17
Thereafter	17
Total lease payments	143
Less: interest	(25)
Total	118
Less: current portion	(29)
Operating	89
Finance Leases
2020	6
2021	2
2022	1
2023	1
2024	1
Thereafter	3
Total lease payments	14
Less: interest	(4)
Total	10
Less: current portion	(5)
Long-term portion	$ 5