Leasing - Present Value of Lease Liabilities (Details) $ in Millions	Sep. 30, 2020 USD ($)
Operating Leases
Remainder of 2020	$ 32
2021	95
2022	73
2023	50
2024	43
2025	35
Thereafter	239
Total lease payments	567
Less: Amount representing interest	(149)
Present value of lease liabilities	418
Finance Leases
Remainder of 2020	4
2021	16
2022	15
2023	9
2024	1
2025	0
Thereafter	0
Total lease payments	45
Less: Amount representing interest	(3)
Present value of lease liabilities	$ 42