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Accounting for Leases as a Lessor - Components of Financing Receivables (Details) - USD ($)
$ in Millions
Apr. 30, 2021
Oct. 31, 2020
Oct. 31, 2019
Leases [Abstract]      
Minimum lease payments receivable $ 9,503 $ 9,448  
Unguaranteed residual value 383 364  
Unearned income (744) (754)  
Total 9,142 9,058  
Allowance for credit losses (224) (154) $ (131)
Financing receivables, net 8,918 8,904  
Less: current portion (3,845) (3,794)  
Amounts due after one year, net $ 5,073 $ 5,110