Allowance for Doubtful Accounts - Impaired Finance Receivables (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Oct. 31, 2012	Oct. 31, 2011
Impaired Financing Receivable, Related Allowance	$ 9	$ 10
Financing Receivable, Recorded Investment, Nonaccrual Status	10	14
Impaired finance receivables with specific loss reserves [Domain]
Impaired Financing Receivable, Recorded Investment	14	15
Impaired financing receivable without specific loss reserves [Domain]
Impaired Financing Receivable, Recorded Investment	1	2
Retail Portfolio [Member]
Impaired Financing Receivable, Related Allowance	9	10
Financing Receivable, Recorded Investment, Nonaccrual Status	10	14
Impaired Financing Receivable, Average Recorded Investment	16	32
Retail Portfolio [Member] | Impaired finance receivables with specific loss reserves [Domain]
Impaired Financing Receivable, Recorded Investment	14	15
Retail Portfolio [Member] | Impaired financing receivable without specific loss reserves [Domain]
Impaired Financing Receivable, Recorded Investment	1	2
Wholesale Portfolio [Member]
Impaired Financing Receivable, Related Allowance	0	0
Financing Receivable, Recorded Investment, Nonaccrual 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