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Accounting for Leases as a Lessor - Minimum Finance Lease Receivables (Details) - USD ($)
$ in Millions
Jan. 31, 2020
Oct. 31, 2019
Leases [Abstract]    
2020   $ 3,939
2021   2,449
2022   1,555
2023   752
2024   306
Thereafter   69
Total $ 9,144 $ 9,070