Fair Value Measurements

12 Months Ended

Sep. 30, 2025

Fair Value Disclosures [Abstract]

Fair Value Measurements

11. Fair Value Measurements

ASC 820, “Fair Value Measurement,” defines fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. ASC 820 also establishes a three-level fair value hierarchy that prioritizes information used in developing assumptions when pricing an asset or liability as follows:

Level 1: Observable inputs such as quoted prices in active markets;

Level 2: Inputs, other than quoted prices in active markets, that are observable either directly or indirectly; and

Level 3: Unobservable inputs where there is little or no market data, which requires the reporting entity to develop its own assumptions.

ASC 820 requires the use of observable market data, when available, in making fair value measurements. When inputs used to measure fair value fall within different levels of the hierarchy, the level within which the fair value measurement is categorized is based on the lowest level input that is significant to the fair value measurement.

Recurring Fair Value Measurements

The following tables present Adient's fair value hierarchy for those assets and liabilities measured at fair value. Refer to Note 14, “Retirement Plans,” of the notes to consolidated financial statements for fair value tables of pension assets.

	Fair Value Measurements Using:
(in millions)	Total as of September 30, 2025		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Other current assets
Foreign currency exchange derivatives	$	36	$	—	$	36	$	—
Other noncurrent assets
Foreign currency exchange derivatives	1		—		1		—
Total assets	$	37	$	—	$	37	$	—
Other current liabilities
Foreign currency exchange derivatives	$	7	$	—	$	7	$	—
Cross currency interest rate swaps	1		—		1		—
Other noncurrent liabilities
Foreign currency exchange derivatives	3		—		3		—
Cross currency interest rate swaps	3		—		3		—
Total liabilities	$	14	$	—	$	14	$	—

	Fair Value Measurements Using:
(in millions)	Total as of September 30, 2024		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Other current assets
Foreign currency exchange derivatives	$	15	$	—	$	15	$	—
Other noncurrent assets
Foreign currency exchange derivatives	3		—		3		—
Total assets	$	18	$	—	$	18	$	—
Other current liabilities
Foreign currency exchange derivatives	$	32	$	—	$	32	$	—
Other noncurrent liabilities
Foreign currency exchange derivatives	9		—		9		—
Total liabilities	$	41	$	—	$	41	$	—

Valuation Methods

Foreign currency exchange derivatives Adient selectively hedges anticipated transactions and net investments that are subject to foreign exchange rate risk primarily using foreign currency exchange hedge contracts. The foreign currency exchange derivatives are valued under a market approach using publicized spot and forward prices. Changes in fair value on foreign exchange derivatives accounted for as hedging instruments under ASC 815 are initially recorded as a component of AOCI and are subsequently reclassified into earnings when the hedged transactions occur and affect earnings. These contracts were highly effective in hedging the variability in future cash flows attributable to changes in currency exchange rates at September 30, 2025 and 2024, respectively. The changes in fair value of foreign currency exchange derivatives not designated as hedging instruments under ASC 815 are recorded in the consolidated statements of income (loss).

The fair value of long-term debt, which was $2.5 billion and $2.4 billion at both September 30, 2025 and 2024, respectively, was determined primarily using market quotes classified as Level 1 inputs within the ASC 820 fair value hierarchy.