REPORTING SEGMENTS AND RELATED INFORMATION - Earnings before interest and income taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Segment Reporting Information
Segment Adjusted Operating Income	$ 495	$ 390	$ 1,357	$ 1,422
Corporate, including stock-based compensation	57	54	182	201
Intangible asset amortization expense	24	25	74	65
Restructuring expense	8	51	50	143
Merger, acquisition and divestiture expense, net	8	8	40	36
Other non-comparable items	0	(1)	13	(3)
Loss (gain) on sale of business	9	0	(15)	7
Equity in affiliates’ earnings, net of tax	(10)	(12)	(29)	(40)
Unrealized (gain) loss on equity securities	(1)	61	27	337
Interest expense, net	12	18	42	75
Other postretirement income	(8)	(10)	(26)	(33)
Earnings before income taxes and noncontrolling interest	396	196	999	634
Provision for income taxes	104	79	252	149
Net earnings	292	117	747	485
Net earnings attributable to noncontrolling interest, net of tax	19	21	58	77
Net earnings attributable to BorgWarner Inc.	273	96	689	408
Air Management
Segment Reporting Information
Segment Adjusted Operating Income	277	214	755	791
e-Propulsion & Drivetrain
Segment Reporting Information
Segment Adjusted Operating Income	86	83	270	349
Restructuring expense			14
Fuel Systems
Segment Reporting Information
Segment Adjusted Operating Income	83	50	193	159
Aftermarket
Segment Reporting Information
Segment Adjusted Operating Income	$ 49	$ 43	$ 139	$ 123