Consolidated Statements of Income (Loss) - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Income Statement [Abstract]
Net Sales	$ 14,688	$ 15,395	$ 14,121
Cost of sales	13,760	14,362	13,314
Gross profit	928	1,033	807
Selling, general and administrative expenses	507	554	598
Restructuring and impairment costs	168	40	25
Equity income	90	84	75
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
Income tax provision	32	0	94
Net income (loss)	101	295	(40)
Income attributable to noncontrolling interests	83	90	80
Net income (loss) attributable to Adient	$ 18	$ 205	$ (120)
Earnings per share:
Basic (in dollars per share)	$ 0.20	$ 2.17	$ (1.27)
Diluted (in dollars per share)	$ 0.20	$ 2.15	$ (1.27)
Shares used in computing earnings per share:
Basic (in shares)	89.5	94.5	94.8
Diluted (in shares)	90.1	95.4	94.8