Restructuring and Impairments - Narrative (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended								3 Months Ended			12 Months Ended		24 Months Ended				3 Months Ended
	Oct. 31, 2012	Oct. 31, 2011	Oct. 31, 2010	Oct. 31, 2011 Engineering integration [Member]	Oct. 31, 2011 Manufacturing Operations [Member]	Oct. 31, 2012 Consolidation of Truck & Engine & Relocation of WHQ [Member]	Oct. 31, 2012 Cost Initiatives [Member]	Oct. 31, 2010 Location IEP And ICC [Member] Other Contractual Costs [Member]	Oct. 31, 2010 Truck [Domain] Location Fort Wayne [Member]	Oct. 31, 2010 Truck [Domain] Location Fort Wayne [Member] Pension And Other Postretirement Contractual Termination Benefits [Member]	Oct. 31, 2010 Truck [Domain] Location Fort Wayne [Member] Employee Severance [Member]	Oct. 31, 2012 Truck [Domain] Location Fort Wayne And Springfield [Member]	Oct. 31, 2011 Truck [Domain] Location Fort Wayne And Springfield [Member]	Oct. 31, 2012 Truck [Domain] Location Fort Wayne And Springfield [Member]	Oct. 31, 2012 Truck [Domain] Location Fort Wayne And Springfield [Member] Employee Relocation [Member]	Oct. 31, 2012 Truck [Domain] Location Fort Wayne And Springfield [Member] Pension And Other Postretirement Contractual Termination Benefits [Member]	Oct. 31, 2012 Truck [Domain] Location Fort Wayne And Springfield [Member] Employee Severance [Member]	Apr. 30, 2012 Truck [Domain] Warrenville [Member] Accrued Rent Expense, Reversal [Domain]	Apr. 30, 2012 Truck [Domain] Warrenville [Member] Lease Vacancy [Member]	Apr. 30, 2012 Truck [Domain] Warrenville [Member] Lease Vacancy Fair Value [Member]	Oct. 31, 2012 Voluntary Separation Program [Member]	Oct. 31, 2012 Voluntary Separation Program [Member] Pension And Other Postretirement Contractual Termination Benefits [Member]	Oct. 31, 2012 Voluntary Separation Program [Member] Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 108	$ 92	$ (15)	$ 29	$ 58	$ 23	$ 73	$ (15)	$ 9	$ 4	$ 5	$ 5	$ 29		$ 18	$ 4		$ 3	$ 16	$ 19	$ 73	$ 7	$ 66
Restructuring and Related Cost, Cost Incurred to Date														$ 34			$ 12