RESTRUCTURING - Reserve by type of cost (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Restructuring Cost and Reserve [Line Items]
Restructuring expense (Note 4)	$ 135	$ 30	$ 33
Air Management
Restructuring Cost and Reserve [Line Items]
Restructuring expense (Note 4)	79	60	49
e-Propulsion & Drivetrain
Restructuring Cost and Reserve [Line Items]
Restructuring expense (Note 4)	70	6	10
Fuel Injection
Restructuring Cost and Reserve [Line Items]
Restructuring expense (Note 4)	8	0	0
Aftermarket
Restructuring Cost and Reserve [Line Items]
Restructuring expense (Note 4)	1	0	0
Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring expense (Note 4)	45	6	8
Employee termination benefits
Restructuring Cost and Reserve [Line Items]
Restructuring expense (Note 4)	157	44	42
Employee termination benefits | Air Management
Restructuring Cost and Reserve [Line Items]
Restructuring expense (Note 4)	50	43	35
Employee termination benefits | e-Propulsion & Drivetrain
Restructuring Cost and Reserve [Line Items]
Restructuring expense (Note 4)	54	1	7
Employee termination benefits | Fuel Injection
Restructuring Cost and Reserve [Line Items]
Restructuring expense (Note 4)	8	0	0
Employee termination benefits | Aftermarket
Restructuring Cost and Reserve [Line Items]
Restructuring expense (Note 4)	1	0	0
Employee termination benefits | Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring expense (Note 4)	44	0	0
Other
Restructuring Cost and Reserve [Line Items]
Restructuring expense (Note 4)	46	28	25
Other | Air Management
Restructuring Cost and Reserve [Line Items]
Restructuring expense (Note 4)	29	17	14
Other | e-Propulsion & Drivetrain
Restructuring Cost and Reserve [Line Items]
Restructuring expense (Note 4)	16	5	3
Other | Fuel Injection
Restructuring Cost and Reserve [Line Items]
Restructuring expense (Note 4)	0	0	0
Other | Aftermarket
Restructuring Cost and Reserve [Line Items]
Restructuring expense (Note 4)	0	0	0
Other | Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring expense (Note 4)	$ 1	$ 6	$ 8