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Allowance for Doubtful Accounts - Schedule of Allowance Aging Analysis (Details) - USD ($)
$ in Millions
Oct. 31, 2019
Oct. 31, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Finance Receivables, Current $ 2,118 $ 2,114
30-90 days past due 77 52
Total finance receivables 2,220 2,180
Retail Portfolio [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Finance Receivables, Current 753 655
30-90 days past due 76 51
Total finance receivables 854 720
Wholesale Portfolio [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Finance Receivables, Current 1,365 1,459
30-90 days past due 1 1
Total finance receivables 1,366 1,460
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Over 90 days past due 25 14
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Retail Portfolio [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Over 90 days past due 25 14
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Wholesale Portfolio [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Over 90 days past due $ 0 $ 0