Fair Value Measurements - Financial Instruments Measured on Nonrecurring Basis (Details) (USD $) In Millions, unless otherwise specified	Jul. 31, 2014		Oct. 31, 2013
Impaired finance receivables with specific loss reserves [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired Financing Receivable, Recorded Investment	$ 18		$ 15
Impaired finance receivables with specific loss reserves [Member] | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired Financing Receivable, Recorded Investment	18	[1]	15	[1]
Specific loss reserves on impaired finance receivables [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Specific loss reserve	(7)		(6)
Specific loss reserves on impaired finance receivables [Member] | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Specific loss reserve	(7)		(6)
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value, Measurements, Nonrecurring [Member] | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Finance Receivables Fair Value Disclosure	$ 11		$ 9

[1] Certain impaired finance receivables are measured at fair value on a nonrecurring basis. An impairment charge is recorded for the amount by which the carrying value of the receivables exceeds the fair value of the underlying collateral, net of remarketing costs. Fair values of the underlying collateral are determined by reference to dealer vehicle value publications adjusted for certain market factors.