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Acquisitions and Divestitures - Acquisitions (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Dec. 31, 2018 | Mar. 31, 2019 | Mar. 31, 2018
Business Acquisition [Line Items] |  |  |
Initial contributions from joint venture |  | $ 28 | $ 0
Consolidated Entity | Adient Aerospace |  |  |
Business Acquisition [Line Items] |  |  |
Ownership interest (as percent) |  | 50.01% |
Americas | Consolidated Entity | Adient Aerospace |  |  |
Business Acquisition [Line Items] |  |  |
Initial contributions from joint venture | $ 28 |  |

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