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REPORTING SEGMENTS AND RELATED INFORMATION - Earnings before interest and income taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Segment Reporting Information |  |  |  |
Segment Adjusted EBIT | $ 365 | $ 356 | $ 1,357 | $ 656
Corporate, including stock-based compensation | 54 | 39 | 201 | 114
Restructuring expense | 51 | 20 | 143 | 72
Merger, acquisition and divestiture expense | 8 | 16 | 36 | 58
Loss on sale | 0 | 0 | 7 | 0
Asset impairments | 0 | 0 | 0 | 17
Net gain on insurance recovery for property damage | (1) | (3) | (3) | (9)
Equity in affiliates’ earnings, net of tax | (12) | (3) | (40) | (10)
Unrealized loss on equity securities | 61 | 0 | 337 | 9
Interest income | (3) | (3) | (9) | (8)
Interest expense | 21 | 20 | 84 | 50
Other postretirement income | (10) | (2) | (33) | (5)
Earnings before income taxes and noncontrolling interest | 196 | 272 | 634 | 368
Provision for income taxes | 79 | 143 | 149 | 186
Net earnings | 117 | 129 | 485 | 182
Net earnings attributable to noncontrolling interest, net of tax | 21 | 18 | 77 | 40
Net earnings attributable to BorgWarner Inc. | 96 | 111 | 408 | 142
Air Management |  |  |  |
Segment Reporting Information |  |  |  |
Segment Adjusted EBIT | 214 | 225 | 813 | 461
e-Propulsion & Drivetrain |  |  |  |
Segment Reporting Information |  |  |  |
Segment Adjusted EBIT | 85 | 131 | 354 | 195
Fuel Injection |  |  |  |
Segment Reporting Information |  |  |  |
Segment Adjusted EBIT | 37 | 0 | 108 | 0
Aftermarket |  |  |  |
Segment Reporting Information |  |  |  |
Segment Adjusted EBIT | $ 29 | $ 0 | $ 82 | $ 0

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