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RESTRUCTURING - Narrative (Details) $ in Millions | 3 Months Ended | 6 Months Ended | 9 Months Ended | 17 Months Ended
--- | --- | --- | --- | ---
Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) employee | Jun. 30, 2021 USD ($) | Jun. 30, 2021 USD ($)
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring expense, net | $ 62 | $ 37 | $ 92 | $ 52 |  |
Air Management |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring expense, net |  | 16 |  | $ 29 |  |
Number of positions eliminated | employee |  |  |  | 350 |  |
Severance Costs and Professional Fees | Air Management |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring expense, net | 12 | 7 | 27 | $ 12 |  |
Severance Costs and Professional Fees | e-Propulsion & Drivetrain |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring expense, net | 5 | 3 | 10 | 5 |  |
Termination Benefit | Air Management |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring expense, net |  | 5 |  | 13 |  |
Employee termination benefits |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring expense, net |  |  | 57 | 40 |  |
Employee termination benefits | Air Management |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring expense, net |  | 3 |  | $ 3 |  |
Number of positions eliminated | employee |  |  |  | 200 |  |
Employee termination benefits | e-Propulsion & Drivetrain |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring expense, net |  | 17 |  | $ 17 |  |
Number of positions eliminated | employee |  |  |  | 350 |  |
Facility Closure | e-Propulsion & Drivetrain | Europe |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring expense, net | 19 |  | 23 |  |  |
Delphi Technologies PLC |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring expense, net |  |  | 31 |  |  |
Delphi Technologies PLC | Severance Costs and Professional Fees | Air Management |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring expense, net |  |  | 2 |  |  |
Delphi Technologies PLC | Severance Costs and Professional Fees | Fuel Injection |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring expense, net | 24 |  | 27 |  |  |
2020 Restructuring Plan |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring expense, net | 37 | $ 37 | 61 | $ 52 |  | $ 209
Restructuring and related plan | $ 300 |  | $ 300 |  | $ 300 | $ 300
Delphi Technologies Restructuring |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring expense, net |  |  |  |  | $ 33 |

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