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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

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