Goodwill and Other Intangible Assets - Schedule of Changes in Carrying Amount of Goodwill (Details) - USD ($) $ in Millions	6 Months Ended
Mar. 31, 2024	Nov. 30, 2023
Goodwill [Roll Forward]
Beginning balance	$ 2,094
Business divestiture	(5)
Currency translation and other	10
Ending balance	2,099
Disposed of By Sale \| Adient (Langfang) Seating Co., Ltd
Goodwill [Roll Forward]
Subsidiary, ownership percentage disposed		51.00%
Adjusted EBITDA
Goodwill [Roll Forward]
Beginning balance	609
Business divestiture	0
Currency translation and other	0
Ending balance	609
EMEA
Goodwill [Roll Forward]
Beginning balance	317
Business divestiture	0
Currency translation and other	9
Ending balance	326
Asia
Goodwill [Roll Forward]
Beginning balance	1,168
Business divestiture	(5)
Currency translation and other	1
Ending balance	$ 1,164

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- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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- Definition

Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of divestiture of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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