Earnings (Loss) Per Share Attributable to Navistar International Corporation - Narrative (Details) - shares shares in Millions	9 Months Ended
	Jul. 31, 2020	Apr. 30, 2020
Four Point Five Zero Senior Subordinated Convertible Notes [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares related to convertible notes	3.4
Four Point Seven Five Senior Subordinated Convertible Notes [Member] [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares related to convertible notes	7.6
Manufacturing Operations [Member] | Convertible Subordinated Debt [Member] | Four Point Five Zero Senior Subordinated Convertible Notes [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Interest rate		4.50%
Manufacturing Operations [Member] | Convertible Subordinated Debt [Member] | Four Point Seven Five Senior Subordinated Convertible Notes [Member] [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Interest rate		4.75%