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REPORTING SEGMENTS AND RELATED INFORMATION - Earnings before interest and income taxes (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Segment Reporting Information    
Segment Adjusted EBIT $ 513 $ 271
Corporate, including stock-based compensation 69 37
Restructuring expense 30 15
Merger, acquisition and divestiture expense 13 21
Net gain on insurance recovery for property damage 2 0
Equity in affiliates’ earnings, net of tax (12) (5)
Unrealized loss on equity securities 272 9
Interest income (3) (2)
Interest expense 21 12
Other postretirement income (11) (2)
Earnings before income taxes and noncontrolling interest 136 186
Provision for income taxes 42 49
Net earnings 94 137
Net earnings attributable to noncontrolling interest, net of tax 29 8
Net earnings attributable to BorgWarner Inc.  65 129
Air Management    
Segment Reporting Information    
Segment Adjusted EBIT 322 208
Restructuring expense   13
e-Propulsion & Drivetrain    
Segment Reporting Information    
Segment Adjusted EBIT 137 63
Fuel Injection    
Segment Reporting Information    
Segment Adjusted EBIT 33 0
Aftermarket    
Segment Reporting Information    
Segment Adjusted EBIT $ 21 $ 0