Earnings (Loss) Per Share Attributable to Navistar International Corporation - Basic & Diluted Loss per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended				6 Months Ended
	Apr. 30, 2020	Jan. 31, 2020	Apr. 30, 2019	Jan. 31, 2019	Apr. 30, 2020	Apr. 30, 2019
Income (loss) from continuing operations, net of tax	$ (38)		$ (48)		$ (74)	$ (37)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	(33)	$ (32)	(43)	$ 17	(65)	(26)
Net loss attributable to Navistar International Corporation	$ (38)		$ (48)		$ (74)	$ (37)
Basic (in shares)	99.7		99.2		99.6	99.2
Weighted Average Number Diluted Shares Outstanding Adjustment	0.0		0.0		0.0	0.0
Diluted (in shares)	99.7		99.2		99.6	99.2
Earnings Per Share, Basic	$ (0.38)		$ (0.48)		$ (0.74)	$ (0.37)
Earnings Per Share, Diluted	$ (0.38)		$ (0.48)		$ (0.74)	$ (0.37)
Retained Earnings [Member]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ (38)	$ (36)	$ (48)	$ 11