Allowance for Doubtful Accounts - Aging Analysis (Details) (USD $) In Millions, unless otherwise specified	Apr. 30, 2013	Oct. 31, 2012
Financing Receivable, Recorded Investment, Past Due [Line Items]
Finance Receivables, Current	$ 2,065	$ 2,091
30-90 days past due	40	73
Over 90 days past due	11	12
Total finance receivables	2,116	2,176
Retail Portfolio [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Finance Receivables, Current	923	965
30-90 days past due	36	72
Over 90 days past due	9	11
Total finance receivables	968	1,048
Wholesale Portfolio [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Finance Receivables, Current	1,142	1,126
30-90 days past due	4	1
Over 90 days past due	2	1
Total finance receivables	$ 1,148	$ 1,128