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Financing Receivables and Operating Leases - Components of Financing Receivables (Details) - USD ($)
$ in Millions
Apr. 30, 2018
Oct. 31, 2017
Oct. 31, 2016
Leases [Abstract]      
Minimum lease payments receivable $ 8,571 $ 8,226  
Unguaranteed residual value 289 272  
Unearned income (697) (654)  
Financing receivables, gross 8,163 7,844  
Allowance for doubtful accounts (97) (86) $ (89)
Financing receivables, net 8,066 7,758  
Less: current portion (3,503) (3,378)  
Amounts due after one year, net $ 4,563 $ 4,380