Consolidated Statements of Income - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Income Statement [Abstract]
Net sales	$ 3,660	$ 3,699
Cost of sales	3,414	3,468
Gross profit	246	231
Selling, general and administrative expenses	147	138
Restructuring and impairment costs	11	7
Equity income	23	28
Earnings before interest and income taxes	111	114
Net financing charges	44	41
Other pension expense (income)	2	9
Income before income taxes	65	64
Income tax provision (benefit)	20	31
Net income	45	33
Income attributable to noncontrolling interests	25	21
Net income attributable to Adient	$ 20	$ 12
Earnings per share:
Basic (in usd per share)	$ 0.22	$ 0.13
Diluted (in usd per share)	$ 0.21	$ 0.13
Shares used in computing earnings per share:
Basic (in shares)	92.9	95.1
Diluted (in shares)	93.6	95.9