Segment Reporting - Narrative (Details) $ in Millions	3 Months Ended								12 Months Ended
	Oct. 31, 2015 USD ($)	Jul. 31, 2015 USD ($)	Apr. 30, 2015 USD ($)	Jan. 31, 2015 USD ($)	Oct. 31, 2014 USD ($)	Jul. 31, 2014 USD ($)	Apr. 30, 2014 USD ($)	Jan. 31, 2014 USD ($)	Oct. 31, 2015 USD ($) segments	Oct. 31, 2014 USD ($)	Oct. 31, 2013 USD ($)
Segment Reporting Information [Line Items]
Concentration Risk, Customer									0	0	0
Number Of Segments | segments									4
Intersegment sales and revenues									$ 0	$ 0	$ 0
Sales and revenues, net	$ 2,488	$ 2,538	$ 2,693	$ 2,421	$ 3,008	$ 2,844	$ 2,746	$ 2,208	10,140	10,806	10,775
North America Truck [Member]
Segment Reporting Information [Line Items]
Intersegment sales and revenues									158	218	242
Sales and revenues, net									7,213	7,473	7,291
North America Parts [Member]
Segment Reporting Information [Line Items]
Intersegment sales and revenues									38	58	62
Sales and revenues, net									2,513	2,551	2,510
Corporate And Eliminations [Member]
Segment Reporting Information [Line Items]
Intersegment sales and revenues									(343)	(390)	(456)
Sales and revenues, net									$ (333)	$ (390)	$ (456)