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Leases - Undiscounted Cash Flows under ASC 842 (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Operating Leases    
2019 (balance of year) $ 6  
2020 23  
2021 16  
2022 11  
2023 7  
Thereafter 6  
Total minimum lease payments 69  
Less: amount of lease payments representing interest (9)  
Present value of future minimum lease payments 60  
Less: current obligations under leases (19) $ 0
Long-term lease operating lease obligations 41  
Finance Leases    
2019 (balance of year) 15  
2020 46  
2021 41  
2022 12  
2023 0  
Thereafter 0  
Total minimum lease payments 114  
Less: amount of lease payments representing interest (6)  
Present value of future minimum lease payments 108  
Less: current obligations under leases (42) (17)
Long-term finance lease obligations $ 66 $ 30