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Financing Receivables and Operating Leases - Components of Financing Receivables (Details) - USD ($)
$ in Millions
Jan. 31, 2019
Oct. 31, 2018
Oct. 31, 2017
Leases [Abstract]      
Minimum lease payments receivable $ 8,868 $ 8,691  
Unguaranteed residual value 309 297  
Unearned income (766) (732)  
Financing receivables, gross 8,411 8,256  
Allowance for doubtful accounts (127) (120) $ (86)
Financing receivables, net 8,284 8,136  
Less: current portion (3,487) (3,396)  
Amounts due after one year, net $ 4,797 $ 4,740