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