Summary of Significant Accounting Policies - Variable Interest Entities (Details) (USD $) In Millions, unless otherwise specified	Apr. 30, 2013	Oct. 31, 2012
Variable Interest Entity Primary Beneficiary Blue Diamond Parts And Blue Diamond Truck [Member]
Variable Interest Entity [Line Items]
Liabilities	$ 165	$ 109
Variable Interest Entity, Consolidated, Carrying Amount, Assets	266	246
Cash and cash equivalents	34	26
Securitizations Treated as Borrowings [Member] | Financial Services Operations [Member]
Variable Interest Entity [Line Items]
Liabilities	773	914
Variable Interest Entity, Consolidated, Carrying Amount, Assets	1,000	1,100
Transaction Does Not Qualify for Sale Accounting [Member] | Financial Services Operations [Member]
Variable Interest Entity [Line Items]
Liabilities	96	157
Variable Interest Entity, Consolidated, Carrying Amount, Assets	$ 317	$ 359