Restructuring and Impairments - Narrative (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended		3 Months Ended			9 Months Ended	3 Months Ended						9 Months Ended		3 Months Ended				9 Months Ended
	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2014	Jul. 31, 2013	Apr. 30, 2014 Employee Severance [Member]	Oct. 31, 2013 Employee Severance [Member]	Jan. 31, 2014 NA Truck [Member]	Jul. 31, 2014 NA Truck [Member]	Jan. 31, 2013 NA Truck [Member] Discontinuation Engineering Program [Member]	Apr. 30, 2013 NA Truck [Member] Garland Assembly Plant [Member] Garland plant closure [Member]	Jan. 31, 2013 NA Truck [Member] Garland Assembly Plant [Member] Garland plant closure [Member]	Jul. 31, 2014 NA Truck [Member] Chatham [Member] Other Restructuring [Member]	Jan. 31, 2014 NA Truck [Member] Huntsville Engine Plant [Member] Employee Severance [Member]	Jan. 31, 2014 NA Truck [Member] Huntsville Engine Plant [Member] Engine Plant Consolidation [Member]	Jul. 31, 2014 Minimum [Member] NA Truck [Member] Chatham [Member]	Jul. 31, 2014 Maximum [Member] NA Truck [Member] Chatham [Member]	Jul. 31, 2013 Discontinuation Engineering Program [Member] NA Truck [Member]	Jul. 31, 2014 Brazilian Reporting Unit [Member]	Apr. 30, 2014 Brazilian Reporting Unit [Member]	Jul. 31, 2013 Brazilian Reporting Unit [Member]	Jul. 31, 2014 Brazilian Reporting Unit [Member]	Jul. 31, 2013 Brazilian Reporting Unit [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 16	$ 6	$ 27	$ 14	$ 8	$ 11			$ 13	$ 8	$ 12	$ 14	$ 1	$ 2
Asset impairment charges	4	17	173	17			18	19									17		149
Goodwill, Impairment Loss																		0	142	0	142	0
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)																		0	7	0	7	0
Other Asset Impairment Charges	4	17	24	17
Restructuring and Related Cost, Expected Cost															$ 0	$ 60