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Financing Receivables and Operating Leases - Components of Financing Receivables (Details) - USD ($)
$ in Millions
Jul. 31, 2017
Oct. 31, 2016
Oct. 31, 2015
Leases [Abstract]      
Minimum lease payments receivable $ 7,873 $ 8,480  
Unguaranteed residual value 254 231  
Unearned income (619) (678)  
Financing receivables, gross 7,508 8,033  
Allowance for doubtful accounts (90) (89) $ (95)
Financing receivables, net 7,418 7,944  
Less: current portion (3,295) (3,360)  
Amounts due after one year, net $ 4,123 $ 4,584