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Segment Information - Schedule of Financial Information for Reportable Segments (Details) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2024 USD ($) | Mar. 31, 2023 USD ($) | Mar. 31, 2024 USD ($) segment | Mar. 31, 2023 USD ($) | Nov. 30, 2023
Segment Reporting [Abstract] |  |  |  |  |
Number of reportable segments | segment |  |  | 3 |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | $ 3,750 | $ 3,912 | $ 7,410 | $ 7,611 |
Adjusted EBITDA | 227 | 215 | 443 | 427 |
Corporate-related costs | 1 | 0 | (6) | 0 |
Restructuring and impairment costs | (125) | (17) | (136) | (24) |
Purchase accounting amortization | (13) | (14) | (24) | (26) |
Restructuring related charges | (2) | 0 | 7 | (3) |
Impairment of interests in nonconsolidated partially owned affiliates | 0 | (7) | 0 | (6) |
Depreciation | (70) | (71) | (142) | (140) |
Equity based compensation | (10) | (10) | (23) | (18) |
Earnings before interest and income taxes | 8 | 96 | 119 | 210 |
Net financing charges | (47) | (59) | (91) | (100) |
Other pension income (expense) | (2) | (2) | (4) | (11) |
Income (loss) before income taxes | (41) | 35 | 24 | 99 |
Gain on contract settlement |  |  | 3 | 1 |
Stock based compensation | 10 | 10 | 23 | 18 |
One-time divestiture related tax impact at an affiliate |  |  | 2 |  |
Net actuarial and settlement/curtailment (gain) loss | 0 | 0 | 0 | 8 |
Adient (Langfang) Seating Co., Ltd | Disposed of By Sale |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Loss on disposal |  |  | 8 |  |
Subsidiary, ownership percentage disposed |  |  |  |  | 51.00%
Restatement Adjustment |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Equity based compensation |  |  | (5) |  |
Stock based compensation |  |  | 5 |  |
Americas |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 1,660 | 1,761 | 3,307 | 3,485 |
Gain on disposition of property plant equipment |  |  | 10 |  |
Brazil |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
One-time gain | 1 |  | 1 |  |
Adjusted EBITDA |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net actuarial and settlement/curtailment (gain) loss |  |  |  | 8 |
EMEA |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Impairment of nonconsolidated partially owned affiliates |  | 3 |  |  |
Asia |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Impairment of nonconsolidated partially owned affiliates |  | 4 |  |  |
Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Adjusted EBITDA | 249 | 238 | 488 | 473 |
Operating Segments | Adjusted EBITDA |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 1,660 | 1,761 | 3,307 | 3,485 |
Adjusted EBITDA | 80 | 72 | 160 | 141 |
Operating Segments | EMEA |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 1,370 | 1,401 | 2,638 | 2,583 |
Adjusted EBITDA | 57 | 53 | 102 | 81 |
Operating Segments | Asia |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 742 | 774 | 1,512 | 1,595 |
Adjusted EBITDA | 112 | 113 | 226 | 251 |
Corporate-related costs |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | (22) | (24) | (47) | (52) |
Adjusted EBITDA |  | (23) | (45) | (46) |
Corporate-related costs | $ (22) | $ (23) | $ (45) | $ (46) |

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