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ACQUISITIONS - Summary of Purchase Price Consideration (Details) - USD ($)
$ / shares in Units, $ in Millions
6 Months Ended
Oct. 01, 2020
Jun. 30, 2021
Jun. 30, 2020
Business Acquisition [Line Items]      
Cash consideration   $ 759 $ 2
Delphi Technologies PLC      
Business Acquisition [Line Items]      
BorgWarner common stock issued for purchase of Delphi Technologies (in shares) 37,188,819    
BorgWarner share price (in dollar per share) $ 39.54    
Fair value of stock consideration $ 1,470    
Stock compensation consideration 7    
Total stock consideration 1,477    
Cash consideration 18    
Repayment of Delphi Technologies’ debt 896    
Total consideration $ 2,391