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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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