Consolidated Statements of Income (Loss) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Statement [Abstract]
Net sales	$ 3,242	$ 1,626	$ 10,909	$ 9,073
Cost of sales	3,092	1,779	10,120	8,726
Gross profit	150	(153)	789	347
Selling, general and administrative expenses	136	115	433	407
Loss on business divestitures - net	0	0	0	25
Restructuring and impairment costs	8	49	20	103
Equity income (loss)	38	48	220	(57)
Earnings (loss) before interest and income taxes	44	(269)	556	(245)
Net financing charges	87	58	256	156
Other pension expense (income)	(4)	(1)	(8)	(5)
Income (loss) before income taxes	(39)	(326)	308	(396)
Income tax provision (benefit)	10	5	90	75
Net income (loss)	(49)	(331)	218	(471)
Income (loss) attributable to noncontrolling interests	22	(6)	70	40
Net income (loss) attributable to Adient	$ (71)	$ (325)	$ 148	$ (511)
Earnings (loss) per share:
Basic (in dollars per share)	$ (0.75)	$ (3.46)	$ 1.57	$ (5.45)
Diluted (in dollars per share)	$ (0.75)	$ (3.46)	$ 1.55	$ (5.45)
Shares used in computing earnings per share:
Basic (in shares)	94.2	93.9	94.1	93.8
Diluted (in shares)	94.2	93.9	95.6	93.8