Restructuring and Impairments - Narrative (Details) - USD ($)	1 Months Ended	3 Months Ended				6 Months Ended
	Dec. 31, 2018	Apr. 30, 2019	Apr. 30, 2018	Oct. 31, 2017	Jul. 31, 2017	Apr. 30, 2019	Apr. 30, 2018	Oct. 31, 2018
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ (1,000,000)	$ (1,000,000)	$ 6,000,000		$ (1,000,000)	$ 2,000,000
Liability, Defined Benefit Plan, Noncurrent		1,950,000,000				1,950,000,000		$ 2,097,000,000
Asset impairment charges		1,000,000	1,000,000			3,000,000	3,000,000
Goodwill		$ 38,000,000				38,000,000		$ 38,000,000
Gain (Loss) on Sales of Investments and Businesses, Net						59,000,000	0
Navistar Defense [Member]
Restructuring Cost and Reserve [Line Items]
Proceeds from Divestiture of Businesses	$ 140,000,000
Potential Additional Consideration	$ 17,000,000
Equity Interest, Percent Sold	70.00%
Gain (Loss) on Sales of Investments and Businesses, Net	$ 54,000,000.00
Melrose Park [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges			2,000,000		$ 41,000,000
Pension Liability					23,000,000
Restructuring Benefit					8,000,000
Inventory Reserve Charge					$ 10,000,000
Global Operations [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges			$ 1,000,000
Assets Leased to Others [Member]
Restructuring Cost and Reserve [Line Items]
Asset impairment charges						$ 3,000,000
long-lived asset [Domain] | Cherokee [Domain]
Restructuring Cost and Reserve [Line Items]
Asset impairment charges							$ 2,000,000