Restructuring and Impairments - Narrative (Details) - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Jul. 31, 2018	Jan. 31, 2018	Oct. 31, 2017	Jul. 31, 2017	Jan. 31, 2017	Jul. 31, 2014	Jul. 31, 2018	Jul. 31, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 1		$ 6	$ (13)			$ (1)	$ (4)
Pension Liability				23
Restructuring Benefit				8
Inventory Reserve Charge				10
Liability, Defined Benefit Plan, Noncurrent	2,378		2,497				2,378
Restructuring and Related Cost, Incurred Cost							3	15
Asset impairment charges	8			6			11	13
Goodwill	$ 38		$ 38				38
Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost							0	0
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost							3	15
Lease Vacancy [Member] [Domain]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost							0	0
Melrose Park [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 2		41
Navistar Financial Corporation [Member]
Restructuring Cost and Reserve [Line Items]
Asset impairment charges							1
Global Operations [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 1
Other Postretirement Benefits Plan [Member] | Chatham [Member] | Facility Closing [Member]
Restructuring Cost and Reserve [Line Items]
Postemployment Benefits, Period Expense				23	$ 6	$ 14
Liability, Defined Benefit Plan, Noncurrent				$ 66				66
Cherokee [Domain]
Restructuring Cost and Reserve [Line Items]
Asset impairment charges							2
long-lived asset [Domain] | North America Truck [Member]
Restructuring Cost and Reserve [Line Items]
Asset impairment charges							6	5
Property Subject to Operating Lease [Member] | North America Truck [Member]
Restructuring Cost and Reserve [Line Items]
Asset impairment charges							$ 2	$ 8