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Leases - Undiscounted Cash Flows under ASC 842 (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Operating Leases    
2019 (balance of year) $ 13  
2020 23  
2021 17  
2022 11  
2023 7  
Thereafter 5  
Total minimum lease payments 76  
Less: amount of lease payments representing interest (12)  
Present value of future minimum lease payments 64  
Less: current obligations under leases (20) $ 0
Long-term lease operating lease obligations 44 0
Finance Leases    
2019 (balance of year) 21  
2020 35  
2021 30  
2022 5  
2023 0  
Thereafter 0  
Total minimum lease payments 91  
Less: amount of lease payments representing interest (5)  
Present value of future minimum lease payments 86  
Less: current obligations under leases (32) (17)
Long-term finance lease obligations $ 54 $ 30