Allowance for Doubtful Accounts - Schedule of Allowance Aging Analysis (Details) - USD ($) $ in Millions	Jul. 31, 2019	Oct. 31, 2018
Financing Receivable, Recorded Investment, Past Due [Line Items]
Finance Receivables, Current	$ 2,405	$ 2,114
30-90 days past due	60	52
Total finance receivables	2,486	2,180
Retail Portfolio [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Finance Receivables, Current	771	655
30-90 days past due	59	51
Total finance receivables	851	720
Wholesale Portfolio [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Finance Receivables, Current	1,634	1,459
30-90 days past due	1	1
Total finance receivables	1,635	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	21	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	21	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