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Lease Commitments - ASC 842 (Details)
$ in Millions
Dec. 31, 2019
USD ($)
Operating Leases  
2020 $ 1,374
2021 1,083
2022 546
2023 336
2024 216
Thereafter 696
Total 4,251
Less: Amounts representing interest 366
Total lease liabilities 3,885
Finance Leases  
2020 35
2021 33
2022 31
2023 31
2024 30
Thereafter 251
Total 411
Less: Amounts representing interest 111
Total lease liabilities $ 300