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Earnings (Loss) Per Share Attributable to Navistar International Corporation - Narrative (Details)
$ / shares in Units, shares in Millions
3 Months Ended 12 Months Ended
Oct. 31, 2019
USD ($)
$ / shares
Oct. 31, 2020
USD ($)
$ / shares
shares
Oct. 31, 2019
$ / shares
shares
Oct. 31, 2018
shares
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 | shares     3.4 3.4
Four Point Five Zero Senior Subordinated Convertible Notes [Member] | Convertible Debt Securities [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Debt Instrument, Convertible, Conversion Ratio   17.1233    
Debt Instrument Convertible Conversion Ratio Basis | $   $ 1,000    
Debt Instrument, Convertible, Conversion Price | $ / shares $ 58.40   $ 58.40  
Four Point Seven Five Senior Subordinated Convertible Notes [Member] [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Debt Instrument, Convertible, Conversion Ratio 18.4946      
Option Indexed to Issuer's Equity, Strike Price | $ / shares   $ 54.07    
Shares related to convertible notes | shares   7.6 7.6  
Four Point Seven Five Senior Subordinated Convertible Notes [Member] [Member] | Convertible Debt Securities [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Debt Instrument Convertible Conversion Ratio Basis | $ $ 1,000