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Leases - Maturity of Lease Liabilities (Details)
$ in Millions
Jun. 30, 2019
USD ($)
Operating  
Remainder of 2019 $ 62
2020 111
2021 92
2022 78
2023 54
Thereafter 247
Total 644
Less: Present value discount (170)
Lease liabilities 474
Finance  
Remainder of 2019 10
2020 16
2021 7
2022 8
2023 5
Thereafter 8
Total 54
Less: Present value discount (3)
Lease liabilities $ 51