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Goodwill and Other Intangible Assets - Additional (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2020 | Jun. 30, 2020 | Sep. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | Mar. 31, 2018 | Mar. 31, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Goodwill [Line Items] |  |  |  |  |  |  |  |  |  |
Impairment |  |  | $ 0 |  |  | $ 0 |  |  | $ 0 | $ 0
Intangible asset | $ 602,000,000 |  | 593,000,000 |  |  |  |  | $ 602,000,000 | 593,000,000 |
Long-lived asset impairment charges |  |  |  | $ 66,000,000 |  |  |  |  |  | 787,000,000
Impairment of definite-lived intangible assets |  |  |  |  | $ 787,000,000 |  |  |  |  |
Amortization of intangibles |  |  |  |  |  |  |  | 37,000,000 | 40,000,000 | $ 47,000,000
Anticipated amortization expense, 2021 | 35,000,000 |  |  |  |  |  |  | 35,000,000 |  |
Anticipated amortization expense, 2022 | 34,000,000 |  |  |  |  |  |  | 34,000,000 |  |
Anticipated amortization expense, 2023 | 33,000,000 |  |  |  |  |  |  | 33,000,000 |  |
Anticipated amortization expense, 2024 | 31,000,000 |  |  |  |  |  |  | 31,000,000 |  |
Anticipated amortization expense, 2025 | 29,000,000 |  |  |  |  |  |  | 29,000,000 |  |
Yanfeng Adient Seating Co., Ltd. (YFAS) |  |  |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |  |  |
Intangible asset | $ 92,000,000 |  |  |  |  |  |  | $ 92,000,000 |  |
Finite-lived intangible assets, remaining amortization period | 18 years |  |  |  |  |  |  | 18 years |  |
Other Intangible Assets] | China |  |  |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |  |  |
Long-lived asset impairment charges |  |  |  |  |  |  |  | $ 24,000,000 |  |
Valuation, income approach | Measurement input, cap rate | Significant Unobservable Inputs (Level 3) |  |  |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |  |  |
Reporting unit, measurement input |  |  |  |  | 12.50% |  |  |  |  | 13.00%
Valuation, income approach | Measurement input, cap rate | Significant Unobservable Inputs (Level 3) | Yanfeng Adient Seating Co., Ltd. (YFAS) |  |  |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |  |  |
Reporting unit, measurement input | 10.50% |  |  |  |  |  |  |  |  |
Customer relationships |  |  |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |  |  |
Intangible asset | $ 424,000,000 |  | $ 494,000,000 |  |  |  |  | $ 424,000,000 | $ 494,000,000 |
Impairment of definite-lived intangible assets |  |  |  | $ 4,000,000 | $ 19,000,000 |  |  |  |  | $ 19,000,000
Seating, seat structures and mechanisms |  |  |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |  |  |
Impairment |  |  |  |  |  | $ 299,000,000 |  |  |  | 299,000,000
Long-lived asset impairment charges |  |  |  |  |  |  |  |  |  | $ 787,000,000
Asia Segment |  |  |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |  |  |
Long-lived asset impairment charges |  | $ 27,000,000 |  |  |  |  |  |  |  |
Asia Segment | China |  |  |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |  |  |
Long-lived asset impairment charges | $ 5,000,000 |  |  |  |  |  |  |  |  |
Asia Segment | Other Intangible Assets] |  |  |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |  |  |
Long-lived asset impairment charges |  | 24,000,000 |  |  |  |  |  |  |  |
Asia Segment | Noncurrent assets | China |  |  |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |  |  |
Long-lived asset impairment charges |  | $ 3,000,000 |  |  |  |  |  |  |  |
Minimum | Valuation, income approach | Measurement input, cap rate | Significant Unobservable Inputs (Level 3) |  |  |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |  |  |
Reporting unit, measurement input | 16.00% |  |  |  |  |  | 15.00% |  |  |
Maximum | Valuation, income approach | Measurement input, cap rate | Significant Unobservable Inputs (Level 3) |  |  |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |  |  |
Reporting unit, measurement input | 18.50% |  |  |  |  |  | 17.50% |  |  |

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