Consolidated Statements of Income (Loss) - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Income Statement [Abstract]
Net Sales	$ 15,395	$ 14,121	$ 13,680
Cost of sales	14,362	13,314	12,854
Gross profit	1,033	807	826
Selling, general and administrative expenses	554	598	537
Loss on business divestitures - net	0	0	26
Restructuring and impairment costs	40	25	21
Equity income (loss)	84	75	1,484
Earnings (loss) before interest and income taxes	523	259	1,726
Net financing charges	195	215	311
Other pension expense (income)	33	(10)	(24)
Income (loss) before income taxes	295	54	1,439
Income tax provision (benefit)	0	94	249
Net income (loss)	295	(40)	1,190
Income (loss) attributable to noncontrolling interests	90	80	82
Net income (loss) attributable to Adient	$ 205	$ (120)	$ 1,108
Earnings per share:
Basic (in dollars per share)	$ 2.17	$ (1.27)	$ 11.76
Diluted (in dollars per share)	$ 2.15	$ (1.27)	$ 11.58
Shares used in computing earnings per share:
Basic (in shares)	94.5	94.8	94.2
Diluted (in shares)	95.4	94.8	95.7