Allowance for Doubtful Accounts - Impaired Finance Receivables (Details) (USD $) In Millions, unless otherwise specified	Jan. 31, 2013	Oct. 31, 2012
Specific loss reserves on impaired finance receivables	$ 8	$ 9
Finance receivables on non-accrual status	9	10
Impaired finance receivables with specific loss reserves [Domain]
Impaired Financing Receivable, Recorded Investment	13	14
Impaired financing receivable without specific loss reserves [Domain]
Impaired Financing Receivable, Recorded Investment	1	1
Retail Portfolio [Member]
Specific loss reserves on impaired finance receivables	8	9
Finance receivables on non-accrual status	9	10
Retail Portfolio [Member] | Impaired finance receivables with specific loss reserves [Domain]
Impaired Financing Receivable, Recorded Investment	13	14
Retail Portfolio [Member] | Impaired financing receivable without specific loss reserves [Domain]
Impaired Financing Receivable, Recorded Investment	1	1
Wholesale Portfolio [Member]
Specific loss reserves on impaired finance receivables	0	0
Finance receivables on non-accrual status	0	0
Wholesale Portfolio [Member] | Impaired finance receivables with specific loss reserves [Domain]
Impaired Financing Receivable, Recorded Investment	0	0
Wholesale Portfolio [Member] | Impaired financing receivable without specific loss reserves [Domain]
Impaired Financing Receivable, Recorded Investment	$ 0	$ 0