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REPORTING SEGMENTS AND RELATED INFORMATION - Adjusted EBIT (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Segment Reporting Information [Line Items] |  |  |  |  |
Adjusted EBIT |  |  | $ 1,833 | $ 1,182 | $ 1,438
Corporate, including stock-based compensation |  |  | 302 | 192 | 206
Restructuring expense |  | $ 50 | 163 | 203 | 72
Customer warranty settlement |  |  | 124 | 0 | 0
Merger, acquisition and divestiture expense |  |  | 50 | 96 | 11
Loss on sales of businesses |  |  | 29 | 0 | 7
Asset impairments and lease modifications |  |  | 17 | 17 | 0
Net gain on insurance recovery for property damage |  |  | (3) | (9) | 0
Intangible asset accelerated amortization |  |  | 0 | 38 | 0
Amortization of inventory fair value adjustment | $ 27 |  | 0 |  | 0
Gain on derecognition of subsidiary (Note 21) |  |  | 0 | 0 | (177)
Unfavorable arbitration loss |  |  | 0 | 0 | 14
Officer stock awards modification |  |  | 0 | 0 | 2
Equity in affiliates’ earnings, net of tax |  |  | (48) | (18) | (32)
Unrealized loss (gain) on equity securities |  |  | 362 | (382) | 0
Interest expense, net |  |  | 93 | 61 | 43
Other postretirement (income) expense |  |  | (45) | (7) | 27
Earnings before income taxes and noncontrolling interest |  |  | 789 | 964 | 1,265
Provision for income taxes |  |  | 150 | 397 | 468
Net earnings |  |  | 639 | 567 | 797
Net earnings attributable to the noncontrolling interest, net of tax |  |  | 102 | 67 | 51
Net earnings attributable to BorgWarner Inc. |  |  | 537 | 500 | 746
Air Management |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Adjusted EBIT |  |  | 1,070 | 762 | 995
e-Propulsion & Drivetrain |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Adjusted EBIT |  |  | 486 | 359 | 443
Loss on sales of businesses |  |  | 7 |  |
Fuel Injection |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Adjusted EBIT |  |  | 170 | 39 | 0
Aftermarket |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Adjusted EBIT |  |  | $ 107 | $ 22 | $ 0

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