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RESTRUCTURING - Reserve by type of cost (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Restructuring Cost and Reserve [Line Items]    
Restructuring expense, net of cash paid $ 30 $ 15
Air Management    
Restructuring Cost and Reserve [Line Items]    
Restructuring expense, net of cash paid 17 13
Fuel Injection    
Restructuring Cost and Reserve [Line Items]    
Restructuring expense, net of cash paid 3 0
e-Propulsion & Drivetrain    
Restructuring Cost and Reserve [Line Items]    
Restructuring expense, net of cash paid 10 2
Employee termination benefits    
Restructuring Cost and Reserve [Line Items]    
Restructuring expense, net of cash paid 21 12
Employee termination benefits | Air Management    
Restructuring Cost and Reserve [Line Items]    
Restructuring expense, net of cash paid 14 11
Employee termination benefits | Fuel Injection    
Restructuring Cost and Reserve [Line Items]    
Restructuring expense, net of cash paid 3 0
Employee termination benefits | e-Propulsion & Drivetrain    
Restructuring Cost and Reserve [Line Items]    
Restructuring expense, net of cash paid 4 1
Other    
Restructuring Cost and Reserve [Line Items]    
Restructuring expense, net of cash paid 9 3
Other | Air Management    
Restructuring Cost and Reserve [Line Items]    
Restructuring expense, net of cash paid 3 2
Other | Fuel Injection    
Restructuring Cost and Reserve [Line Items]    
Restructuring expense, net of cash paid 0 0
Other | e-Propulsion & Drivetrain    
Restructuring Cost and Reserve [Line Items]    
Restructuring expense, net of cash paid $ 6 $ 1