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Lease Commitments (ASC 842) (Details)
$ in Millions
Sep. 30, 2019
USD ($)
Operating Leases  
2019 (remaining months) $ 409
2020 1,301
2021 1,023
2022 508
2023 318
2024 201
Thereafter 688
Total 4,448
Less: Amounts representing interest 383
Total lease liabilities 4,065
Finance Leases  
2019 (remaining months) 12
2020 31
2021 30
2022 28
2023 27
2024 27
Thereafter 220
Total 375
Less: Amounts representing interest 105
Total lease liabilities $ 270