Consolidated Statements of Income - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Income Statement [Abstract]
Net sales	$ 3,716	$ 4,055	$ 11,126	$ 11,666
Cost of sales	3,509	3,753	10,443	10,883
Gross profit	207	302	683	783
Selling, general and administrative expenses	121	148	383	427
Restructuring and impairment costs	16	6	152	30
Equity income	24	25	65	57
Earnings before interest and income taxes	94	173	213	383
Net financing charges	48	49	139	149
Other pension expense	1	1	5	12
Income before income taxes	45	123	69	222
Income tax provision	40	28	68	84
Net income	5	95	1	138
Income attributable to noncontrolling interests	16	22	62	68
Net income (loss) attributable to Adient	$ (11)	$ 73	$ (61)	$ 70
Earnings (loss) per share:
Basic (in usd per share)	$ (0.12)	$ 0.78	$ (0.67)	$ 0.74
Diluted (in usd per share)	$ (0.12)	$ 0.77	$ (0.67)	$ 0.73
Shares used in computing earnings per share:
Basic (in shares)	88.6	94.1	90.7	94.8
Diluted (in shares)	88.6	94.9	90.7	95.6