Earnings (Loss) Per Share Attributable to Navistar International Corporation - Basic & Diluted Loss per Share (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2021	Apr. 30, 2020
Amounts attributable to Navistar International Corporation common stockholders:
Income (loss) from continuing operations, net of tax	$ 163	$ (38)	$ 81	$ (74)
Income from discontinued operations, net of tax	0	0	1	0
Net income (loss) attributable to Navistar International Corporation common stockholders	$ 163	$ (38)	$ 82	$ (74)
Weighted average shares outstanding:
Basic (in shares)	99,900,000	99,700,000	99,900,000	99,600,000
Effect of dilutive securities (in shares)	300,000	0	300,000	0
Diluted (in shares)	100,200,000	99,700,000	100,200,000	99,600,000
Basic
Continuing operations (in dollars per share)	$ 1.63	$ (0.38)	$ 0.81	$ (0.74)
Discontinued operations (in dollars per share)	0	0	0.01	0
Basic (in dollars per share)	1.63	(0.38)	0.82	(0.74)
Diluted
Continuing operations (in dollars per share)	1.63	(0.38)	0.81	(0.74)
Discontinued operation (in dollars per share)	0	0	0.01	0
Diluted (in dollars per share)	$ 1.63	$ (0.38)	$ 0.82	$ (0.74)
Dilutive securities included in computation of diluted earnings (loss) per share		0		0