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Leases - Schedule of Minimum Lease Commitments (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
As of June 30, 2019    
2019 $ 95  
2020 155  
2021 119  
2022 96  
2023 60  
Thereafter 275  
Total lease commitments 800  
Less: Interest (117)  
Present value of lease liabilities $ 683  
As of December 31, 2018    
2019   $ 193
2020   165
2021   123
2022   102
2023   51
Thereafter   32
Total lease commitments   $ 666