REPORTING SEGMENTS AND RELATED INFORMATION - Earnings before interest and income taxes (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Segment Reporting Information
Segment Adjusted Operating Income	$ 454	$ 452
Corporate, including stock-based compensation	58	63
Merger, acquisition and divestiture expense, net	25	23
Intangible asset amortization expense	24	23
Restructuring expense	7	15
Gain on sale of business	0	(24)
Equity in affiliates’ earnings, net of tax	(4)	(8)
Unrealized loss on debt and equity securities	15	39
Interest expense, net	10	15
Other postretirement expense (income)	2	(9)
Earnings before income taxes and noncontrolling interest	317	315
Provision for income taxes	87	91
Net earnings	230	224
Net earnings attributable to noncontrolling interest, net of tax	13	24
Net earnings attributable to BorgWarner Inc.	217	200
Air Management
Segment Reporting Information
Segment Adjusted Operating Income	285	251
Drivetrain & Battery Systems
Segment Reporting Information
Segment Adjusted Operating Income	110	113
Restructuring expense		7
Fuel Systems
Segment Reporting Information
Segment Adjusted Operating Income	48	66
Aftermarket
Segment Reporting Information
Segment Adjusted Operating Income	45	39
ePropulsion
Segment Reporting Information
Segment Adjusted Operating Income	$ (34)	$ (17)