Summary of Significant Accounting Policies - Variable Interest Entities (Details) (USD $) In Millions, unless otherwise specified	Apr. 30, 2014	Oct. 31, 2013	Apr. 30, 2013	Oct. 31, 2012
Variable Interest Entity [Line Items]
Cash and Cash Equivalents, at Carrying Value	$ 594	$ 755	$ 505	$ 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	298	323
Cash and Cash Equivalents, at Carrying Value	79	56
Liabilities	225	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	1,059	989
Liabilities	844	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	66	61
Liabilities	$ 51	$ 49