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Accounting for Leases as a Lessor - Gross Financing Receivables and Related Allowance Evaluated for Loss (Details) - USD ($)
$ in Millions
Jan. 31, 2020
Oct. 31, 2019
Oct. 31, 2018
Leases [Abstract]      
Gross financing receivables collectively evaluated for loss $ 8,250 $ 8,255  
Gross financing receivables individually evaluated for loss 486 397  
Financing receivables, gross 8,736 8,652  
Allowance for financing receivables collectively evaluated for loss 86 84  
Allowance for financing receivables individually evaluated for loss 47 47  
Total $ 133 $ 131 $ 120