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RESTRUCTURING - Narrative (Details)
$ in Millions
 3 Months Ended 6 Months Ended 14 Months Ended
Mar. 31, 2021
USD ($)
Mar. 31, 2020
USD ($)
employee
Mar. 31, 2021
USD ($)
Mar. 31, 2021
USD ($)
Restructuring Cost and Reserve [Line Items]        
Restructuring expense, net $ 30 $ 15    
Air Management        
Restructuring Cost and Reserve [Line Items]        
Restructuring expense, net   $ 13    
Number of positions eliminated | employee   350    
Severance Costs and Professional Fees | Air Management        
Restructuring Cost and Reserve [Line Items]        
Restructuring expense, net 15 $ 5    
Severance Costs and Professional Fees | e-Propulsion & Drivetrain        
Restructuring Cost and Reserve [Line Items]        
Restructuring expense, net 6 2    
Termination Benefit | Air Management        
Restructuring Cost and Reserve [Line Items]        
Restructuring expense, net   8    
Closed | e-Propulsion & Drivetrain | Europe        
Restructuring Cost and Reserve [Line Items]        
Restructuring expense, net 4      
Employee termination benefits        
Restructuring Cost and Reserve [Line Items]        
Restructuring expense, net 21 12    
Delphi Technologies PLC        
Restructuring Cost and Reserve [Line Items]        
Restructuring expense, net 5      
Delphi Technologies PLC | Severance Costs and Professional Fees | Air Management        
Restructuring Cost and Reserve [Line Items]        
Restructuring expense, net 2      
Delphi Technologies PLC | Severance Costs and Professional Fees | Fuel Injection        
Restructuring Cost and Reserve [Line Items]        
Restructuring expense, net 3      
2020 Restructuring Plan        
Restructuring Cost and Reserve [Line Items]        
Restructuring expense, net 24 $ 15   $ 172
Restructuring and related plan $ 300   $ 300 $ 300
Delphi Technologies Restructuring        
Restructuring Cost and Reserve [Line Items]        
Restructuring expense, net     $ 7