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Acquisitions and Divestitures (Details)					3 Months Ended									6 Months Ended	12 Months Ended
	Sep. 30, 2020 USD ($) employee segment	Jun. 24, 2020 USD ($)	Jan. 31, 2020 USD ($)	Oct. 25, 2019 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($) airplane	Mar. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Oct. 11, 2018
Business Acquisition [Line Items]
Initial contributions from joint ventures											$ 28,000,000				$ 0	$ 28,000,000	$ 0
Gain (loss) On deconsolidation															(13,000,000)	0	0
Impairment									$ 0				$ 0			0	0
Loss on business divestitures - net															13,000,000	0	0
Business divestitures															499,000,000	0	0
Long-lived asset impairment charges										$ 66,000,000							787,000,000
Intangible asset	$ 602,000,000				$ 602,000,000				$ 593,000,000						602,000,000	593,000,000
AYM
Business Acquisition [Line Items]
Proceeds from intangible assets			$ 20,000,000
Automotive fabrics manufacturing
Business Acquisition [Line Items]
Cash divested from deconsolidation	4,000,000
Business divestitures	170,000,000
Disposal group, including discontinued operation, goodwill	$ 80,000,000				$ 80,000,000										80,000,000
Global facilities | segment	11
Number of employees | employee	1,300
Disposal group, including discontinued operation, revenue															99,000,000	130,000,000
Disposal group, including discontinued operation, operating income (loss)																$ 8,000,000
Entities in China and properties in U.S. | Assets held for sale
Business Acquisition [Line Items]
Long-lived asset impairment charges															21,000,000
Entities in China and properties in U.S. | Americas | Assets held for sale | Reportable Segments
Business Acquisition [Line Items]
Long-lived asset impairment charges															12,000,000
Entities in China and properties in U.S. | China | Assets held for sale | Reportable Segments
Business Acquisition [Line Items]
Long-lived asset impairment charges															$ 9,000,000
Detroit properties and airplanes | Assets held for sale
Business Acquisition [Line Items]
Long-lived asset impairment charges														$ 49,000,000			49,000,000
Detroit properties and airplanes | Assets held for sale | Corporate-related costs
Business Acquisition [Line Items]
Long-lived asset impairment charges																	10,000,000
Detroit properties and airplanes | Disposed of by sale
Business Acquisition [Line Items]
Consideration for disposal group											$ 35,000,000	$ 36,000,000		$ 36,000,000			36,000,000
Detroit properties and airplanes | Americas | Assets held for sale | Reportable Segments
Business Acquisition [Line Items]
Long-lived asset impairment charges																	$ 39,000,000
Detroit airplane | Disposed of by sale
Business Acquisition [Line Items]
Number of airplanes sold | airplane												1
AYM | Yanfeng
Business Acquisition [Line Items]
Ownership percentage			50.00%
AYM | Adient
Business Acquisition [Line Items]
Ownership percentage			50.00%
Yanfeng Adient Seating Co., Ltd. (YFAS)
Business Acquisition [Line Items]
Ownership percentage	49.90%				49.90%				49.90%						49.90%	49.90%
Intangible asset	$ 92,000,000				$ 92,000,000										$ 92,000,000
Finite-lived intangible assets, remaining amortization period					18 years										18 years
Yanfeng Adient Seating Co., Ltd. (YFAS) | Yanfeng
Business Acquisition [Line Items]
Ownership percentage			50.01%
Yanfeng Adient Seating Co., Ltd. (YFAS) | Adient
Business Acquisition [Line Items]
Ownership percentage			49.99%
YFAI
Business Acquisition [Line Items]
Ownership percentage	0.00%		30.00%		0.00%				30.00%						0.00%	30.00%
Business divestitures			$ 369,000,000
Payments to acquire equity method investments, paid at closing			309,000,000
Payments to acquire equity method investments, paid on a deferred basis post-closing			$ 60,000,000
Equity method investments, percentage of distributable earnings to be paid out			30.00%
Proceeds from transactions			$ 329,000,000
Long-lived asset impairment charges		$ 9,000,000	$ 216,000,000			$ 6,000,000		$ 216,000,000
YFAI | Yanfeng
Business Acquisition [Line Items]
Ownership percentage			70.00%
YFAI | Adient
Business Acquisition [Line Items]
Ownership percentage			30.00%
Adient Aerospace
Business Acquisition [Line Items]
Cash divested from deconsolidation				$ 37,000,000
Impairment				21,000,000
Adient Aerospace | Americas Segment
Business Acquisition [Line Items]
Gain (loss) On deconsolidation				$ 4,000,000
RECARO
Business Acquisition [Line Items]
Loss on business divestitures - net								$ 21,000,000							$ 101,000,000
Net sales																$ 148,000,000
RECARO | Americas Segment
Business Acquisition [Line Items]
Loss on business divestitures - net							$ 21,000,000								$ 21,000,000
Significant Unobservable Inputs (Level 3) | Measurement input, cap rate | Valuation, income approach
Business Acquisition [Line Items]
Reporting unit, measurement input												12.50%					13.00%
Significant Unobservable Inputs (Level 3) | Measurement input, cap rate | Valuation, income approach | Yanfeng Adient Seating Co., Ltd. (YFAS)
Business Acquisition [Line Items]
Reporting unit, measurement input					10.50%
Significant Unobservable Inputs (Level 3) | Measurement input, cap rate | Valuation, income approach | YFAI
Business Acquisition [Line Items]
Reporting unit, measurement input					15.00%
Adient Aerospace
Business Acquisition [Line Items]
Ownership interest (as percent)																		50.01%
Ownership percentage				19.99%
Gain (loss) On deconsolidation				$ 4,000,000

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