Consolidated Statements of Income - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023
Income Statement [Abstract]
Net sales	$ 3,750	$ 3,912	$ 7,410	$ 7,611
Cost of sales	3,520	3,662	6,934	7,130
Gross profit	230	250	476	481
Selling, general and administrative expenses	115	141	262	279
Restructuring and impairment costs	125	17	136	24
Equity income	18	4	41	32
Earnings before interest and income taxes	8	96	119	210
Net financing charges	47	59	91	100
Other pension expense (income)	2	2	4	11
Income (loss) before income taxes	(41)	35	24	99
Income tax provision (benefit)	8	25	28	56
Net income (loss)	(49)	10	(4)	43
Income attributable to noncontrolling interests	21	25	46	46
Net income (loss) attributable to Adient	$ (70)	$ (15)	$ (50)	$ (3)
Earnings (loss) per share:
Basic (in usd per share)	$ (0.77)	$ (0.16)	$ (0.55)	$ (0.03)
Diluted (in usd per share)	$ (0.77)	$ (0.16)	$ (0.55)	$ (0.03)
Shares used in computing earnings per share:
Basic (in shares)	90.5	95.3	91.7	95.2
Diluted (in shares)	90.5	95.3	91.7	95.2