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Segment Information - EBITDA Reportable Segments (Details) $ in Millions	12 Months Ended
	Sep. 30, 2024 USD ($) segment facility	Sep. 30, 2023 USD ($) facility	Sep. 30, 2022 USD ($)	Nov. 30, 2023
Segment Reporting [Abstract]
Number of reportable segments \| segment	3
Segment Reporting Information [Line Items]
Net Sales	$ 14,688	$ 15,395	$ 14,121
Adjusted EBITDA	880	938	675
Corporate - related costs	2	5	(4)
Restructuring and impairment costs	(168)	(40)	(25)
Purchase accounting amortization	(48)	(52)	(54)
Restructuring related activities	0	2	(6)
Loss on disposal transaction	(7)	(6)	0
Depreciation	(285)	(290)	(298)
Equity based compensation	(31)	(34)	(29)
Earnings before interest and income taxes	343	523	259
Net financing charges	(189)	(195)	(215)
Other pension expense (income)	(21)	(33)	10
Income before income taxes	$ 133	$ 295	54
Number of restructured facilities \| facility	2	2
(Gain) on sale of / impairment of nonconsolidated partially owned affiliates	$ 1
One-time gain	3
Recorded charges	1
One-time divestiture related tax impact at an affiliate	1
Integration-related costs		$ 3	8
Disposed of By Sale \| Adient (Langfang) Seating Co., Ltd
Segment Reporting Information [Line Items]
Loss on disposal	8
Subsidiary, ownership percentage disposed				51.00%
RUSSIAN FEDERATION
Segment Reporting Information [Line Items]
Allowance for doubtful accounts			1
Americas
Segment Reporting Information [Line Items]
Gain on disposition of property plant equipment	10	10
BRAZIL
Segment Reporting Information [Line Items]
Tax adjustments	1	4	32
TURKEY
Segment Reporting Information [Line Items]
Tax adjustments			14
Gain (loss) on disposition of other assets		4	2
EMEA
Segment Reporting Information [Line Items]
Long-lived asset impairment charges			6
(Gain) on sale of / impairment of nonconsolidated partially owned affiliates		3	7
EMEA \| RUSSIAN FEDERATION
Segment Reporting Information [Line Items]
Long-lived asset impairment charges	9		4
Asia
Segment Reporting Information [Line Items]
(Gain) on sale of / impairment of nonconsolidated partially owned affiliates		3	3
Reportable Segments
Segment Reporting Information [Line Items]
Adjusted EBITDA	969	1,032	763
Reportable Segments \| Americas
Segment Reporting Information [Line Items]
Net Sales	6,763	7,220	6,557
Reportable Segments \| Americas
Segment Reporting Information [Line Items]
Net Sales	6,763	7,220	6,557
Adjusted EBITDA	375	336	242
Reportable Segments \| EMEA
Segment Reporting Information [Line Items]
Net Sales	5,029	5,195	4,764
Adjusted EBITDA	155	232	138
Reportable Segments \| Asia
Segment Reporting Information [Line Items]
Net Sales	2,989	3,085	2,926
Adjusted EBITDA	439	464	383
Corporate/Eliminations
Segment Reporting Information [Line Items]
Net Sales	(93)	(105)	(126)
Adjusted EBITDA	(89)	(94)	(88)
Corporate - related costs	$ (89)	$ (94)	$ (88)