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Allowance for Doubtful Accounts - Schedule of Impaired Finance Receivables (Details) - USD ($)
$ in Millions
6 Months Ended
Apr. 30, 2020
Apr. 30, 2019
Oct. 31, 2019
Retail Portfolio [Member]      
Finance Receivable, Impaired [Line Items]      
Impaired Financing Receivable, Average Recorded Investment $ 23 $ 21  
Impaired finance receivables with specific loss reserves [Member]      
Finance Receivable, Impaired [Line Items]      
Impaired Financing Receivable, Recorded Investment 26   $ 23
Impaired finance receivables with specific loss reserves [Member] | Retail Portfolio [Member]      
Finance Receivable, Impaired [Line Items]      
Impaired Financing Receivable, Recorded Investment 26   23
Impaired finance receivables with specific loss reserves [Member] | Wholesale Portfolio [Member]      
Finance Receivable, Impaired [Line Items]      
Impaired Financing Receivable, Recorded Investment 0   0
Impaired financing receivable without specific loss reserves [Member]      
Finance Receivable, Impaired [Line Items]      
Impaired Financing Receivable, Recorded Investment 0   1
Impaired financing receivable without specific loss reserves [Member] | Retail Portfolio [Member]      
Finance Receivable, Impaired [Line Items]      
Impaired Financing Receivable, Recorded Investment 0   1
Impaired financing receivable without specific loss reserves [Member] | Wholesale Portfolio [Member]      
Finance Receivable, Impaired [Line Items]      
Impaired Financing Receivable, Recorded Investment 0   0
Specific loss reserves on impaired finance receivables [Member]      
Finance Receivable, Impaired [Line Items]      
Specific loss reserves on impaired finance receivables 15   11
Specific loss reserves on impaired finance receivables [Member] | Retail Portfolio [Member]      
Finance Receivable, Impaired [Line Items]      
Specific loss reserves on impaired finance receivables 15   11
Specific loss reserves on impaired finance receivables [Member] | Wholesale Portfolio [Member]      
Finance Receivable, Impaired [Line Items]      
Specific loss reserves on impaired finance receivables 0   0
Finance receivable non-accrual status [Member]      
Finance Receivable, Impaired [Line Items]      
Finance receivables on non-accrual status 26   24
Finance receivable non-accrual status [Member] | Retail Portfolio [Member]      
Finance Receivable, Impaired [Line Items]      
Finance receivables on non-accrual status 26   24
Finance receivable non-accrual status [Member] | Wholesale Portfolio [Member]      
Finance Receivable, Impaired [Line Items]      
Finance receivables on non-accrual status $ 0   $ 0