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Restructuring- Narrative (Details) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) employee | Sep. 30, 2019 USD ($)
Restructuring Cost and Reserve |  |  |  |
Restructuring expense | $ 20 | $ 14 | $ 72 | $ 41
Corporate |  |  |  |
Restructuring Cost and Reserve |  |  |  |
Restructuring expense |  |  |  | 3
Engine |  |  |  |
Restructuring Cost and Reserve |  |  |  |
Restructuring and related cost, number of positions eliminated (employees) | employee |  |  | 200 |
Drivetrain |  |  |  |
Restructuring Cost and Reserve |  |  |  |
Restructuring and related cost, number of positions eliminated (employees) | employee |  |  | 350 |
Voluntary employee severance | Engine |  |  |  |
Restructuring Cost and Reserve |  |  |  |
Restructuring expense | 15 | 10 | $ 40 | 18
Termination benefit | Engine |  |  |  |
Restructuring Cost and Reserve |  |  |  |
Restructuring expense |  |  | 3 |
Termination benefit | Drivetrain |  |  |  |
Restructuring Cost and Reserve |  |  |  |
Restructuring expense |  |  | 19 |
Professional fees and employee termination benefits | Engine |  |  |  |
Restructuring Cost and Reserve |  |  |  |
Restructuring expense |  | $ 3 |  | $ 14
Severance costs and professional fees | Drivetrain |  |  |  |
Restructuring Cost and Reserve |  |  |  |
Restructuring expense | $ 3 |  | $ 8 |

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