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Leases Schedule of Minimum Lease Payments (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Operating leases    
2019 $ 174 $ 709
2020 665 619
2021 572 553
2022 388 389
2023 277 295
2024 and thereafter 855 858
Gross lease payments 2,931 3,423
Less: imputed interest 383  
Total operating lease liabilities 2,548  
Finance leases    
2019 29 70
2020 94 71
2021 86 66
2022 94 75
2023 96 82
2024 and thereafter 611 586
Gross lease payments 1,010 950
Less: imputed interest 301 301
Total finance lease liabilities $ 709 $ 649