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Accounting for Leases as a Lessor - Components of Financing Receivables (Details) - USD ($)
$ in Millions
Jan. 31, 2020
Oct. 31, 2019
Oct. 31, 2018
Leases [Abstract]      
Minimum lease payments receivable $ 9,144 $ 9,070  
Unguaranteed residual value 344 336  
Unearned income (752) (754)  
Financing receivables, gross 8,736 8,652  
Allowance for doubtful accounts (133) (131) $ (120)
Financing receivables, net 8,603 8,521  
Less: current portion (3,591) (3,572)  
Amounts due after one year, net $ 5,012 $ 4,949