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, 2019	Jan. 31, 2019	Apr. 30, 2018	Apr. 30, 2019	Apr. 30, 2018
Income (loss) from continuing operations, net of tax	$ (48)		$ 55	$ (37)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	(43)	$ (43)	61	(26)	$ (5)
Net loss attributable to Navistar International Corporation	$ (48)		$ 55	$ (37)	$ (18)
Basic (in shares)	99.2		98.8	99.2	98.7
Weighted Average Number Diluted Shares Outstanding Adjustment	0.0		0.7	0.0	0.0
Diluted (in shares)	99.2		99.5	99.2	98.7
Earnings Per Share, Basic	$ (0.48)		$ 0.56	$ (0.37)	$ (0.18)
Earnings Per Share, Diluted	$ (0.48)		$ 0.55	$ (0.37)	$ (0.18)
Retained Earnings [Member]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest				$ (37)	$ (18)