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Leases - Undiscounted Cash Flows under ASC 842 (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Operating Leases    
2019 (balance of year) $ 18  
2020 21  
2021 15  
2022 11  
2023 7  
Thereafter 7  
Total minimum lease payments 79  
Less: amount of lease payments representing interest (14)  
Present value of future minimum lease payments 65  
Less: current obligations under leases (17) $ 0
Long-term lease obligations 48 0
Finance Leases    
2019 (balance of year) 20  
2020 24  
2021 19  
2022 0  
2023 0  
Thereafter 0  
Total minimum lease payments 63  
Less: amount of lease payments representing interest (4)  
Present value of future minimum lease payments 59  
Less: current obligations under leases (21) (17)
Long-term lease obligations $ 38 $ 30