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ACQUISITIONS - Narrative (Details)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Oct. 05, 2020
USD ($)
Oct. 01, 2020
USD ($)
$ / shares
Sep. 30, 2019
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2021
EUR (€)
segment
Jun. 30, 2021
USD ($)
segment
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
Jun. 04, 2021
EUR (€)
Jun. 04, 2021
USD ($)
May 19, 2021
EUR (€)
Dec. 31, 2020
USD ($)
Dec. 29, 2020
May 31, 2019
USD ($)
Business Acquisition [Line Items]                              
Goodwill                 $ 3,325       $ 2,627    
Number of reportable segments | segment           4 4                
Unrealized loss on equity securities       $ 4 $ 0   $ 276 $ 9              
Equity securities                 203       $ 472    
Asset impairments       0 17   0 17              
BorgWarner Romeo Power LLC                              
Business Acquisition [Line Items]                              
Payments for investments in equity securities                             $ 50
Payments to acquire interest in joint venture     $ 10                        
Unrealized loss on equity securities       $ 4     276                
Equity securities                 $ 156            
Asset impairments               9              
Investment in equity securities         41     41              
Romeo Power Inc                              
Business Acquisition [Line Items]                              
Equity method interest (percent)                             20.00%
Senior Notes                              
Business Acquisition [Line Items]                              
Debt instrument, face amount   $ 800                          
Senior Notes | 1.000% Senior Notes due 05/19/31 (€1,000 million par value)                              
Business Acquisition [Line Items]                              
Debt instrument stated interest rate                   1.00% 1.00% 1.00%      
Debt instrument, face amount | €           € 1,000,000,000           € 1,000,000,000.0      
Senior Notes | DT Notes                              
Business Acquisition [Line Items]                              
Debt instrument stated interest rate   5.00%                          
Redeemable principal amount $ 776                            
Percentage of principal amount redeemed 97.00%                            
BorgWarner Romeo Power LLC                              
Business Acquisition [Line Items]                              
Noncontrolling interest, ownership percentage by parent (in percent)     60.00%                     14.00%  
AKASOL                              
Business Acquisition [Line Items]                              
Business acquisition, percentage of voting interests acquired           93.00%     93.00% 89.00% 89.00%        
Amount of settlement paid                   € 648,000,000 $ 788        
Purchase of additional shares of AKASOL           € 28,000,000 $ 33                
Financial liabilities assumed                   € 64,000,000 77        
Goodwill                     $ 707        
Delphi Technologies PLC                              
Business Acquisition [Line Items]                              
Business acquisition, percentage of voting interests acquired   100.00%                          
Goodwill   $ 710             $ 733            
Estimated Fair Value   $ 650                          
Fixed exchange ratio   0.4307                          
Common stock, par value (in dollar per share) | $ / shares   $ 0.01                          
Total consideration   $ 2,391                          
Net sales         $ 2,054     $ 5,278              
Delphi Technologies PLC | Senior Notes                              
Business Acquisition [Line Items]                              
Financial liabilities assumed   800                          
Senior notes $ 24                            
Developed technology | AKASOL                              
Business Acquisition [Line Items]                              
Estimated Fair Value                 $ 130            
Developed technology | Delphi Technologies PLC                              
Business Acquisition [Line Items]                              
Estimated Fair Value   $ 270                          
Estimated Life   14 years                          
Customer relationships | Minimum                              
Business Acquisition [Line Items]                              
Estimated Life           7 years 7 years                
Customer relationships | Maximum                              
Business Acquisition [Line Items]                              
Estimated Life           15 years 15 years                
Customer relationships | Delphi Technologies PLC                              
Business Acquisition [Line Items]                              
Estimated Fair Value   $ 380                          
Estimated Life   15 years