Allowance for Doubtful Accounts Aging Analysis (Details) (USD $) In Millions, unless otherwise specified	Oct. 31, 2011	Oct. 31, 2010
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	$ 2,843
30-90 days past due	90
Over 90 days past due	14
Total finance receivables	2,947	2,976
Retail Portfolio [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	1,515
30-90 days past due	85
Over 90 days past due	13
Total finance receivables	1,613
Wholesale Portfolio [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	1,328
30-90 days past due	5
Over 90 days past due	1
Total finance receivables	$ 1,334