Summary of Significant Accounting Policies - Variable Interest Entities (Details) (USD $) In Millions, unless otherwise specified	Jul. 31, 2014	Oct. 31, 2013	Jul. 31, 2013	Oct. 31, 2012
Variable Interest Entity [Line Items]
Cash and Cash Equivalents, at Carrying Value	$ 547	$ 755	$ 425	$ 1,087
Variable Interest Entity Primary Beneficiary Blue Diamond Parts And Blue Diamond Truck [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity, Consolidated, Carrying Amount, Assets	279	323
Cash and Cash Equivalents, at Carrying Value	48	56
Liabilities	235	188
Variable Interest Entity Primary Beneficiary Securitizations Treated As Borrowings [Member] | Financial Services Operations [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity, Consolidated, Carrying Amount, Assets	1,000	989
Liabilities	828	778
Transaction Does Not Qualify for Sale Accounting [Member] | Financial Services Operations [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity, Consolidated, Carrying Amount, Assets	190	61
Liabilities	$ 69	$ 49