Consolidated Statements of Income (Loss) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Income Statement [Abstract]
Net sales	$ 3,506	$ 3,819	$ 6,986	$ 7,667
Cost of sales	3,328	3,521	6,635	7,028
Gross profit	178	298	351	639
Selling, general and administrative expenses	135	148	297	297
Restructuring and impairment costs	4	5	8	12
Equity income (loss)	7	85	40	182
Earnings (loss) before interest and income taxes	46	230	86	512
Net financing charges	83	110	133	169
Other pension expense (income)	(1)	(2)	(2)	(4)
Income (loss) before income taxes	(36)	122	(45)	347
Income tax provision (benefit)	24	28	45	80
Net income (loss)	(60)	94	(90)	267
Income (loss) attributable to noncontrolling interests	21	25	45	48
Net income (loss) attributable to Adient	$ (81)	$ 69	$ (135)	$ 219
Earnings (loss) per share:
Basic (in usd per share)	$ (0.85)	$ 0.73	$ (1.43)	$ 2.33
Diluted (in usd per share)	$ (0.85)	$ 0.72	$ (1.43)	$ 2.30
Shares used in computing earnings per share:
Basic (in shares)	94.8	94.2	94.7	94.1
Diluted (in shares)	94.8	96.0	94.7	95.4