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Amount classified as goodwill attributable to disposal group held for sale or disposed of.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Amount of gain (loss) on sale or disposal of an equity method investment.

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Percentage investment held by members or limited partners of limited liability company (LLC) or limited partnership (LP).

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The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

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Acquisitions and Divestitures - Acquisitions (Details)									3 Months Ended						6 Months Ended		12 Months Ended
Acquisitions and Divestitures - Acquisitions (Details)	Apr. 01, 2021 USD ($)	Mar. 31, 2021 USD ($)	Mar. 12, 2021 USD ($)	Mar. 12, 2021 CNY (¥)	Sep. 30, 2020 USD ($) employee facility	Jun. 24, 2020 USD ($)	Jan. 31, 2020 USD ($)	Oct. 25, 2019 USD ($)	Mar. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Mar. 31, 2021 USD ($)	Mar. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Oct. 11, 2018
Business Acquisition [Line Items]
Receipt of deferred consideration															$ 19,000,000	$ 0
Intangible asset		$ 645,000,000			$ 602,000,000				$ 645,000,000						645,000,000		$ 602,000,000
Gain on sale of joint venture									33,000,000						33,000,000	(216,000,000)
Non-cash impairment charges											$ 6,000,000				10,000,000	0
Equity income (loss)									85,000,000			$ 8,000,000			182,000,000	(105,000,000)
Loss on divestitures - net									0			0			0	25,000,000
Initial contributions from joint venture														$ 28,000,000
Loss on deconsolidation									0			$ 0			$ 0	(25,000,000)
Assets held for sale
Business Acquisition [Line Items]
Non-cash impairment charges									$ 2,000,000	$ 8,000,000
AYM
Business Acquisition [Line Items]
Proceeds from intangible assets							$ 20,000,000
Yanfeng
Business Acquisition [Line Items]
License revenue payment			$ 59,000,000	¥ 385,000,000
Automotive Fabrics Manufacturing \| Disposed of by sale
Business Acquisition [Line Items]
Receipt of deferred consideration					170,000,000
Cash divested from deconsolidation					4,000,000
Goodwill					$ 80,000,000												80,000,000
Number of facilities sold \| facility					11
Number of employees \| employee					1,300
Sales																	99,000,000	$ 130,000,000
Pre-tax income																		8,000,000
Entities in China and Properties in U.S. \| Assets held for sale
Business Acquisition [Line Items]
Non-cash impairment charges																	21,000,000
Entities in China and Properties in U.S. \| Assets held for sale \| Operating segments \| Americas
Business Acquisition [Line Items]
Non-cash impairment charges																	12,000,000
Entities in China and Properties in U.S. \| Assets held for sale \| Operating segments \| China
Business Acquisition [Line Items]
Non-cash impairment charges																	$ 9,000,000
RECARO \| Disposed of by sale
Business Acquisition [Line Items]
Loss on divestitures - net													$ 21,000,000
Adient Aerospace
Business Acquisition [Line Items]
Cash divested from deconsolidation								$ 37,000,000
Loss on deconsolidation																$ 4,000,000
Goodwill impairment								21,000,000
YFAS
Business Acquisition [Line Items]
Proceeds from divestiture of interest in joint venture			1,228,000,000	8,064,000,000
Potential payments to acquire Interest in joint venture			267,000,000	1,754,000,000
Intangible asset																		$ 92,000,000
Amortization period																		18 years
YFAS \| Payable upon Sale Closing
Business Acquisition [Line Items]
Proceeds from divestiture of interest in joint venture			525,000,000	3,446,000,000
YFAS \| Payable on or before the later of December 21, 2021 and Sale Closing
Business Acquisition [Line Items]
Proceeds from divestiture of interest in joint venture			703,000,000	4,618,000,000
YFAS \| Valuation, Income Approach \| Measurement Input, Cap Rate \| Significant Unobservable Inputs (Level 3)
Business Acquisition [Line Items]
Measurement input, discount rate									10.50%
YFAI
Business Acquisition [Line Items]
Investment ownership percentage							30.00%
Receipt of deferred consideration							$ 369,000,000
Proceeds from sale of businesses, paid at closing							309,000,000
Proceeds from divestiture of businesses, paid on a deferred basis post-closing							$ 60,000,000
Percent of distributable earnings to be paid out							30.00%
Proceeds from sale of equity method investments							$ 60,000,000
Proceeds from previous divestiture of interest in joint venture, earnout payments									$ 19,000,000
Proceeds from transactions							329,000,000
Non-cash impairment charges						$ 9,000,000	$ 216,000,000						$ 216,000,000
Equity income (loss)																		$ 40,000,000
YFAI \| Valuation, Income Approach \| Measurement Input, Cap Rate \| Significant Unobservable Inputs (Level 3)
Business Acquisition [Line Items]
Measurement input, discount rate									15.00%
YFM
Business Acquisition [Line Items]
Proceeds from divestiture of interest in joint venture			11,000,000	71,000,000
YFAT
Business Acquisition [Line Items]
Receipt of deferred consideration			17,000,000	113,000,000
YFAT \| KEIPER
Business Acquisition [Line Items]
Proceeds from divestiture of interest in joint venture			6,000,000	38,000,000
CQYFAS \| The Boxun Agreement
Business Acquisition [Line Items]
Proceeds from divestiture of interest in joint venture			126,000,000	825,000,000
GZDFAS \| YFAS
Business Acquisition [Line Items]
Proceeds from divestiture of interest in joint venture			56,000,000	371,000,000
YHAS \| YFAS
Business Acquisition [Line Items]
Receipt of deferred consideration			2,000,000	13,000,000
Shenyang Jinbei Adient Automative Components Co., Ltd
Business Acquisition [Line Items]
Proceeds from divestiture of interest in joint venture									$ 58,000,000
Shenyang Jinbei Adient Automative Components Co., Ltd \| Subsequent event
Business Acquisition [Line Items]
Proceeds from divestiture of interest in joint venture	$ 53,000,000
Yanfeng \| AYM
Business Acquisition [Line Items]
Investment ownership percentage							50.00%
Yanfeng \| YFAS
Business Acquisition [Line Items]
Investment ownership percentage							50.01%
Adient \| AYM
Business Acquisition [Line Items]
Investment ownership percentage							50.00%
Adient \| YFAS
Business Acquisition [Line Items]
Investment ownership percentage							49.99%
YFAS
Business Acquisition [Line Items]
Distributed earnings			$ 635,000,000	¥ 4,168,000,000
RECARO \| Disposed of by sale
Business Acquisition [Line Items]
Net sales																		$ 148,000,000
Americas \| Adient Aerospace
Business Acquisition [Line Items]
Loss on deconsolidation								$ 4,000,000
Adient Aerospace
Business Acquisition [Line Items]
Investment ownership percentage								19.99%
Ownership interest (as percent)																			50.01%
Yanfeng \| YFAI
Business Acquisition [Line Items]
Ownership interest							70.00%
Yanfeng \| YFAS
Business Acquisition [Line Items]
Ownership interest															50.01%
Adient \| YFAI
Business Acquisition [Line Items]
Ownership interest							30.00%
Adient \| YFAT \| KEIPER
Business Acquisition [Line Items]
Ownership interest			25.00%	25.00%
Adient \| CQYFAS
Business Acquisition [Line Items]
Ownership interest			100.00%	100.00%
Adient \| GZDFAS \| YFAS
Business Acquisition [Line Items]
Ownership interest			25.00%	25.00%
Adient \| YHAS \| YFAS
Business Acquisition [Line Items]
Ownership interest			10.00%	10.00%
Adient \| YFAS
Business Acquisition [Line Items]
Ownership interest															49.99%
Boxun \| CQYFAS \| The Boxun Agreement
Business Acquisition [Line Items]
Ownership interest			25.00%	25.00%
YFAS \| YFAS
Business Acquisition [Line Items]
Ownership interest			49.99%	49.99%
YFAS \| YFM
Business Acquisition [Line Items]
Investment ownership percentage			70.00%	70.00%
YFAS \| YFAT
Business Acquisition [Line Items]
Ownership interest			75.00%	75.00%
YFAS \| CQYFAS
Business Acquisition [Line Items]
Ownership interest			50.00%	50.00%
Shenyang Jinbei Adient Automative Components Co., Ltd
Business Acquisition [Line Items]
Ownership interest		50.00%