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Financing Receivables and Operating Leases - Components of Financing Receivables (Details) - USD ($)
$ in Millions
Jul. 31, 2018
Oct. 31, 2017
Oct. 31, 2016
Leases [Abstract]      
Minimum lease payments receivable $ 8,530 $ 8,226  
Unguaranteed residual value 290 272  
Unearned income (705) (654)  
Financing receivables, gross 8,115 7,844  
Allowance for doubtful accounts (103) (86) $ (89)
Financing receivables, net 8,012 7,758  
Less: current portion (3,435) (3,378)  
Amounts due after one year, net $ 4,577 $ 4,380