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						9 Months Ended
	Jul. 31, 2020	Apr. 30, 2020	Jan. 31, 2020	Jul. 31, 2019	Apr. 30, 2019	Jan. 31, 2019	Jul. 31, 2020	Jul. 31, 2019
Income (loss) from continuing operations, net of tax	$ (37)			$ 156			$ (111)	$ 119
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	(34)	$ (33)	$ (32)	161	$ (43)	$ 17	(99)	135
Net loss attributable to Navistar International Corporation	$ (37)			$ 156			$ (111)	$ 119
Basic (in shares)	99.7			99.4			99.6	99.2
Weighted Average Number Diluted Shares Outstanding Adjustment	0.0			0.3			0.0	0.3
Diluted (in shares)	99.7			99.7			99.6	99.5
Earnings Per Share, Basic	$ (0.37)			$ 1.57			$ (1.11)	$ 1.20
Earnings Per Share, Diluted	$ (0.37)			$ 1.56			$ (1.11)	$ 1.20
Retained Earnings [Member]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ (37)	$ (38)		$ 156	$ (48)	$ 11