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OTHER EXPENSE (INCOME), NET - Narrative (Details)
$ in Millions
1 Months Ended 12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2020
USD ($)
facility
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Oct. 30, 2019
May 31, 2019
Schedule of Equity Method Investments [Line Items]            
Merger, acquisition and divestiture expense   $ 96 $ 11 $ 6    
Asset impairment and loss on divestiture   $ 17 7 25    
Number of facility closures | facility   2        
Proceeds from divestiture of businesses $ 28          
Net gain on insurance recovery for property damage   $ 9 0 0    
Insurance Deductible Expense   1        
Proceeds from Insurance Settlement   145        
Gain on derecognition of subsidiary   0 177 0    
Unfavorable arbitration loss   0 14 0    
Asbestos-related adjustments   0 0 23    
Gain on sale of building   0 0 19    
Gain on commercial settlement   0 0 $ 4    
BorgWarner Morse TEC LLC            
Schedule of Equity Method Investments [Line Items]            
Ownership interest equity interest         100.00%  
Gain on derecognition of subsidiary     $ 177      
Air Management            
Schedule of Equity Method Investments [Line Items]            
Asset impairment and loss on divestiture   9        
e-Propulsion & Drivetrain            
Schedule of Equity Method Investments [Line Items]            
Asset impairment and loss on divestiture   $ 8        
Romeo Power Inc.            
Schedule of Equity Method Investments [Line Items]            
Ownership interest equity interest     20.00%     20.00%