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Revenue - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Dec. 31, 2018
Oct. 31, 2019
Oct. 31, 2018
Oct. 31, 2017
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax   $ 11,251    
Operating lease revenue   11 $ 24 $ 26
Retail [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax   142    
Extended warranty contracts [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax   113    
Extended warranty contracts [Member] | Extended warranty contracts [Member]        
Disaggregation of Revenue [Line Items]        
Deferred Revenue   279 255 271
Deferred Revenue, Revenue Recognized   $ 113 $ 104 $ 144
Navistar Defense [Member]        
Disaggregation of Revenue [Line Items]        
Equity Interest, Percent Sold 70.00%