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Accounting for Leases as a Lessor - Components of Financing Receivables (Details) - USD ($)
$ in Millions
Apr. 30, 2020
Oct. 31, 2019
Oct. 31, 2018
Leases [Abstract]      
Minimum lease payments receivable $ 9,051 $ 9,070  
Unguaranteed residual value 342 336  
Unearned income (715) (754)  
Financing receivables, gross 8,678 8,652  
Allowance for doubtful accounts (126) (131) $ (120)
Financing receivables, net 8,552 8,521  
Less: current portion (3,630) (3,572)  
Amounts due after one year, net $ 4,922 $ 4,949