Summary of Significant Accounting Policies - Variable Interest Entities (Details) (USD $) In Millions, unless otherwise specified	Oct. 31, 2012	Oct. 31, 2011
Variable Interest Entity Primary Beneficiary Blue Diamond Parts And Blue Diamond Truck [Member]
Variable Interest Entity [Line Items]
Assets	$ 246	$ 306
Liabilities	109	158
Cash and cash equivalents	26	38
Securitizations Treated as Borrowings [Member] | Financial Services Operations [Member]
Variable Interest Entity [Line Items]
Assets	1,100	1,800
Liabilities	914	1,500
Transaction Does Not Qualify for Sale Accounting [Member] | Financial Services Operations [Member]
Variable Interest Entity [Line Items]
Assets	359	468
Liabilities	$ 157	$ 216