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Leases - Future Maturities of Lease Liabilities - ASC 842 (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Operating Leases    
2019 (excluding the nine months ended September 30) $ 64  
2020 227  
2021 180  
2022 129  
2023 100  
Thereafter 383  
Total Lease Payments 1,083  
Less: Imputed Interest 244  
Total 839  
Finance Leases    
2019 (excluding the nine months ended September 30) 6  
2020 25  
2021 35  
2022 21  
2023 20  
Thereafter 706  
Total Lease Payments 813  
Less: Imputed Interest 568  
Total $ 245 $ 37