Leasing - Present Value of Lease Liabilities (Details) $ in Millions	Jun. 30, 2019 USD ($)
Operating Leases
2019	$ 68
2020	107
2021	81
2022	61
2023	44
Thereafter	307
Total lease payments	668
Less: Amount representing interest	(180)
Present value of lease liabilities	488
Finance Leases
2019	2
2020	3
2021	3
2023	2
2024	1
Thereafter	0
Total lease payments	11
Less: Amount representing interest	(1)
Present value of lease liabilities	$ 10