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Goodwill and Other Intangible Assets (Tables) | 3 Months Ended
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Dec. 31, 2025
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Changes in Carrying Amount of Goodwill | The changes in the carrying amount of goodwill are as follows:
(in millions) |  | Americas |  | EMEA |  | Asia |  | Total |  |  |  |  |
Balance at September 30, 2025 |  | $ | 607 |  |  | $ | — |  |  | $ | 1,200 |  |  | $ | 1,807 |  |  |  |  |  |
Currency translation |  | (1) |  |  | — |  |  | 6 |  |  | 5 |  |  |  |  |  |
Balance at December 31, 2025 |  | $ | 606 |  |  | $ | — |  |  | $ | 1,206 |  |  | $ | 1,812 |  |  |  |  |  |
Schedule of Intangible Assets | Adient's other intangible assets, primarily from business acquisitions valued based on independent appraisals, consisted of:
|  | December 31, 2025 |  | September 30, 2025
(in millions) |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net
Other intangible assets |  |  |  |  |  |  |  |  |  |  |  |
Patented technology |  | $ | 82 |  |  | $ | (48) |  |  | $ | 34 |  |  | $ | 81 |  |  | $ | (45) |  |  | $ | 36 |
Customer relationships |  | 547 |  |  | (279) |  |  | 268 |  |  | 537 |  |  | (265) |  |  | 272 |
Other |  | 15 |  |  | (4) |  |  | 11 |  |  | 15 |  |  | (4) |  |  | 11 |
Total other intangible assets |  | $ | 644 |  |  | $ | (331) |  |  | $ | 313 |  |  | $ | 633 |  |  | $ | (314) |  |  | $ | 319 |

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