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								12 Months Ended
	Oct. 31, 2020	Jul. 31, 2020	Apr. 30, 2020	Jan. 31, 2020	Oct. 31, 2019	Jul. 31, 2019	Apr. 30, 2019	Jan. 31, 2019	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2018
Earnings Per Share [Abstract]
Income from continuing operations, net of tax									$ (347)	$ 221	$ 340
Net loss attributable to Navistar International Corporation									$ (347)	$ 221	$ 340
Basic (in shares)									99.7	99.3	98.9
Weighted Average Number Diluted Shares Outstanding Adjustment									0.0	0.2	0.7
Diluted (in shares)									99.7	99.5	99.6
Basic: Loss from Continuing Operations (in dollars per share)	$ (2.36)	$ (0.37)	$ (0.38)	$ (0.36)	$ 1.03	$ 1.57	$ (0.48)	$ 0.11
Basic (in dollars per share)									$ (3.48)	$ 2.23	$ 3.44
Diluted: Loss from Continuing Operations (in dollars per share)	$ (2.36)	$ (0.37)	$ (0.38)	$ (0.36)	$ 1.02	$ 1.56	$ (0.48)	$ 0.11
Diluted (in dollars per share)									$ (3.48)	$ 2.22	$ 3.41