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Restructuring, Impairments and Divestitures - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Dec. 31, 2018
Apr. 30, 2020
Apr. 30, 2019
Apr. 30, 2020
Apr. 30, 2019
Restructuring Cost and Reserve [Line Items]          
Asset impairment charges   $ 13 $ 1 $ 13 $ 3
Gain (Loss) on Sales of Investments and Businesses, Net       $ 0 59
Navistar Defense [Member]          
Restructuring Cost and Reserve [Line Items]          
Equity Interest, Percent Sold 70.00%        
Proceeds from Divestiture of Businesses $ 140        
Gain (Loss) on Sales of Investments and Businesses, Net $ 54        
Global Operations [Member]          
Restructuring Cost and Reserve [Line Items]          
Asset impairment charges   12      
Assets Leased to Others [Member]          
Restructuring Cost and Reserve [Line Items]          
Asset impairment charges   $ 1 $ 1   $ 3