Consolidated Statements of Income (Loss) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Income Statement [Abstract]
Net sales	$ 3,741	$ 3,716	$ 10,847	$ 11,126
Cost of sales	3,504	3,509	10,133	10,443
Gross profit	237	207	714	683
Selling, general and administrative expenses	129	121	398	383
Restructuring and impairment costs	7	16	381	152
Equity income	17	24	60	65
Earnings before interest and income taxes	118	94	(5)	213
Net financing charges	51	48	144	139
Other pension expense	1	1	3	5
Income (loss) before income taxes	66	45	(152)	69
Income tax provision	7	40	77	68
Net income (loss)	59	5	(229)	1
Income attributable to noncontrolling interests	23	16	70	62
Net income (loss) attributable to Adient	$ 36	$ (11)	$ (299)	$ (61)
Earnings (loss) per share:
Basic (in usd per share)	$ 0.43	$ (0.12)	$ (3.56)	$ (0.67)
Diluted (in usd per share)	$ 0.43	$ (0.12)	$ (3.56)	$ (0.67)
Shares used in computing earnings per share:
Basic (in shares)	83.5	88.6	83.9	90.7
Diluted (in shares)	83.7	88.6	83.9	90.7