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RESTRUCTURING - Narrative (Details) $ in Millions | 3 Months Ended | 6 Months Ended | 14 Months Ended
--- | --- | --- | ---
Mar. 31, 2021 USD ($) | Mar. 31, 2020 USD ($) employee | Mar. 31, 2021 USD ($) | Mar. 31, 2021 USD ($)
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring expense, net | $ 30 | $ 15 |  |
Air Management |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring expense, net |  | $ 13 |  |
Number of positions eliminated | employee |  | 350 |  |
Severance Costs and Professional Fees | Air Management |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring expense, net | 15 | $ 5 |  |
Severance Costs and Professional Fees | e-Propulsion & Drivetrain |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring expense, net | 6 | 2 |  |
Termination Benefit | Air Management |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring expense, net |  | 8 |  |
Closed | e-Propulsion & Drivetrain | Europe |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring expense, net | 4 |  |  |
Employee termination benefits |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring expense, net | 21 | 12 |  |
Delphi Technologies PLC |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring expense, net | 5 |  |  |
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 | 3 |  |  |
2020 Restructuring Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring expense, net | 24 | $ 15 |  | $ 172
Restructuring and related plan | $ 300 |  | $ 300 | $ 300
Delphi Technologies Restructuring |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring expense, net |  |  | $ 7 |

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