Consolidated Statements of Income (Loss) - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Income Statement [Abstract]
Net sales	$ 14,535	$ 14,688	$ 15,395
Cost of sales	13,574	13,760	14,362
Gross profit	961	928	1,033
Selling, general and administrative expenses	522	507	554
Restructuring and impairment costs	392	168	40
Equity income	68	90	84
Earnings before interest and income taxes	115	343	523
Net financing charges	193	189	195
Other pension expense	10	21	33
Income (loss) before income taxes	(88)	133	295
Income tax provision	103	32	0
Net income (loss)	(191)	101	295
Income attributable to noncontrolling interests	90	83	90
Net income (loss) attributable to Adient	$ (281)	$ 18	$ 205
Earnings (Loss) per share:
Basic (in dollars per share)	$ (3.39)	$ 0.20	$ 2.17
Diluted (in dollars per share)	$ (3.39)	$ 0.20	$ 2.15
Shares used in computing earnings (loss) per share:
Basic (in shares)	83.0	89.5	94.5
Diluted (in shares)	83.0	90.1	95.4