Leases - Summary of Maturities of Lease Liabilities (Details) $ in Millions	Dec. 31, 2019 USD ($)
Operating Leases
2020	$ 142
2021	131
2022	117
2023	101
2024	82
Thereafter	265
Total lease payments	838
Less imputed interest	90
Total	748
Finance Leases
2020	3
2021	3
2022	2
2023	2
2024	1
Thereafter	4
Total lease payments	15
Less imputed interest	2
Total	13
2020	145
2021	134
2022	119
2023	103
2024	83
Thereafter	269
Total lease payments	853
Less imputed interest	92
Total	$ 761