Restructuring and Impairments - Narrative (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended		3 Months Ended			6 Months Ended	3 Months Ended					6 Months Ended		3 Months Ended		6 Months Ended
	Apr. 30, 2014	Apr. 30, 2013	Apr. 30, 2014	Apr. 30, 2013	Apr. 30, 2014 Employee Severance [Member]	Oct. 31, 2013 Employee Severance [Member]	Jan. 31, 2014 NA Truck [Member]	Apr. 30, 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]	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]	Apr. 30, 2014 Minimum [Member] NA Truck [Member] Chatham [Member]	Apr. 30, 2014 Maximum [Member] NA Truck [Member] Chatham [Member]	Jul. 31, 2013 Discontinuation Engineering Program [Member] NA Truck [Member]	Apr. 30, 2014 Brazilian Reporting Unit [Member]	Apr. 30, 2014 Brazilian Reporting Unit [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 8	$ 6	$ 11	$ 8	$ 8	$ 11			$ 13	$ 8	$ 12	$ 1	$ 2
Asset impairment charges	151	0	169	0			18	19								17	149
Goodwill, Impairment Loss																	142	142
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)																	7	7
Other Asset Impairment Charges	2		20
Restructuring and Related Cost, Expected Cost														$ 20	$ 70