Segment Reporting - Narrative (Details) $ in Millions	3 Months Ended								12 Months Ended
	Oct. 31, 2017 segments	Jul. 31, 2017 USD ($)	Apr. 30, 2017 USD ($)	Jan. 31, 2017 USD ($)	Oct. 31, 2016 USD ($)	Jul. 31, 2016 USD ($)	Apr. 30, 2016 USD ($)	Jan. 31, 2016 USD ($)	Oct. 31, 2017 USD ($)	Oct. 31, 2016 USD ($)	Oct. 31, 2015 USD ($)	Oct. 31, 2014
Segment Reporting [Abstract]
Concentration Risk, Customer									0		0	0
Segment Reporting Information [Line Items]
Number Of Segments | segments	4
Intersegment sales and revenues									$ 0	$ 1	$ 0
Sales and revenues, net		$ 2,213	$ 2,096	$ 1,663	$ 2,063	$ 2,086	$ 2,197	$ 1,765	8,570	8,111	10,140
Financial Services Operations
Segment Reporting Information [Line Items]
Investment Income, Interest									165	167	175
Intersegment sales and revenues									93	100	96
Sales and revenues, net									235	235	241
North America Truck [Member]
Segment Reporting Information [Line Items]
Intersegment sales and revenues									39	132	158
Sales and revenues, net									5,809	5,403	7,213
North America Parts [Member]
Segment Reporting Information [Line Items]
Intersegment sales and revenues									23	29	38
Sales and revenues, net									2,392	2,427	2,513
Corporate And Eliminations [Member]
Segment Reporting Information [Line Items]
Intersegment sales and revenues									(185)	(305)	(343)
Sales and revenues, net									$ (175)	$ (295)	$ (333)