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Reporting Segments and Related Information - Adjusted EBIT (Details) - USD ($) $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 30, 2019 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Adjusted EBIT |  |  |  |  |  |  |  |  |  | $ 1,438 | $ 1,515 | $ 1,440
Gain on derecognition of subsidiary | $ (177) |  |  |  |  |  |  |  |  | (177) | 0 | 0
Restructuring expense |  | $ 31 | $ 14 | $ 13 | $ 14 | $ 23 | $ 6 | $ 31 | $ 8 | 72 | 67 | 58
Unfavorable arbitration loss |  |  |  |  |  |  |  |  |  | 14 | 0 | 0
Asset impairment and loss on divestiture |  |  |  |  |  | 26 |  |  |  | 7 | 25 | 71
Asbestos-related adjustments |  |  |  |  |  | 23 |  |  |  | 0 | 23 | 0
Gain on sale of building |  |  |  |  |  | (19) |  |  |  | 0 | (19) | 0
Other postretirement income |  | 1 | (1) | 27 | 0 | (2) | (3) | (2) | (3) | 27 | (10) | (5)
Income (Loss) from Equity Method Investments |  | 7 | 7 | 9 | 9 | 11 | 15 | 13 | 10 | 32 | 49 | 51
Officer stock awards modification |  |  |  |  |  |  |  |  |  | 2 | 8 | 0
Merger, acquisition and divestiture expense |  |  |  |  |  | 1 | 2 | 1 | 2 | 11 | 6 | 10
Lease termination settlement |  |  |  |  |  |  |  |  |  | 0 | 0 | 5
Other (income) expense, net |  |  |  |  |  |  |  |  |  | 0 | (4) | 2
Corporate, including stock-based compensation |  |  |  |  |  |  |  |  |  | 206 | 219 | 222
Interest income |  | (3) | (4) | (2) | (3) | (2) | (1) | (1) | (2) | (12) | (6) | (6)
Interest expense |  | 12 | 15 | 14 | 14 | 14 | 14 | 15 | 16 | 55 | 59 | 71
Earnings before income taxes and noncontrolling interest |  |  |  |  |  |  |  |  |  | 1,265 | 1,196 | 1,063
Provision for income taxes |  | 238 | 66 | 73 | 91 | 19 | 67 | 30 | 95 | 468 | 211 | 580
Net earnings |  | 237 | 207 | 182 | 171 | 248 | 216 | 284 | 237 | 797 | 985 | 483
Net earnings attributable to the noncontrolling interest, net of tax |  | 17 | 13 | 10 | 11 | 18 | 12 | 12 | 12 | 51 | 54 | 43
Net earnings attributable to BorgWarner Inc. |  | $ 220 | $ 194 | $ 172 | $ 160 | $ 230 | $ 204 | $ 272 | $ 225 | 746 | 931 | 440
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement |  |  |  |  |  |  |  |  |  | (27) | 0 | 0
Engine [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Adjusted EBIT |  |  |  |  |  |  |  |  |  | 995 | 1,040 | 992
Drivetrain [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Adjusted EBIT |  |  |  |  |  |  |  |  |  | $ 443 | 475 | $ 448
Restructuring expense |  |  |  |  |  |  |  |  |  |  | $ 7 |

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