Allowance for Doubtful Accounts - Aging Analysis (Details) (USD $) In Millions, unless otherwise specified	Jul. 31, 2013	Oct. 31, 2012
Financing Receivable, Recorded Investment, Past Due [Line Items]
Finance Receivables, Current	$ 1,934	$ 2,091
30-90 days past due	50	73
Over 90 days past due	11	12
Total finance receivables	1,995	2,176
Retail Portfolio [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Finance Receivables, Current	783	965
30-90 days past due	49	72
Over 90 days past due	9	11
Total finance receivables	841	1,048
Wholesale Portfolio [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Finance Receivables, Current	1,151	1,126
30-90 days past due	1	1
Over 90 days past due	2	1
Total finance receivables	$ 1,154	$ 1,128