Allowance for Doubtful Accounts - Schedule of Allowance Aging Analysis (Details) $ in Millions	Oct. 31, 2015 USD ($)
Financing Receivable, Recorded Investment, Past Due [Line Items]
Finance Receivables, Current	$ 1,947
30-90 days past due	52
Over 90 days past due	22
Total finance receivables	2,021
Retail Portfolio [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Finance Receivables, Current	486
30-90 days past due	48
Over 90 days past due	20
Total finance receivables	554
Wholesale Portfolio [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Finance Receivables, Current	1,461
30-90 days past due	4
Over 90 days past due	2
Total finance receivables	$ 1,467