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Restructuring, Impairments and Divestitures - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Dec. 31, 2018
Jul. 31, 2020
Apr. 30, 2020
Jul. 31, 2019
Jul. 31, 2020
Jul. 31, 2019
Restructuring Cost and Reserve [Line Items]            
Asset impairment charges   $ 12   $ 3 $ 25 $ 6
Gain (Loss) on Sales of Investments and Businesses, Net         0 56
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 $ 51          
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   $ 12   $ 3 $ 13 $ 6