Consolidated Statements of Income (Loss) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Statement [Abstract]
Net sales	$ 4,219	$ 4,494	$ 12,605	$ 13,294
Cost of sales	4,008	4,249	12,017	12,566
Gross profit	211	245	588	728
Selling, general and administrative expenses	165	186	511	575
Restructuring and impairment costs	15	57	159	372
Equity income (loss)	64	87	209	268
Earnings (loss) before interest and income taxes	95	89	127	49
Net financing charges	60	39	135	109
Other pension expense (income)	5	(10)	3	(18)
Income (loss) before income taxes	30	60	(11)	(42)
Income tax provision (benefit)	338	(13)	412	224
Net income (loss)	(308)	73	(423)	(266)
Income (loss) attributable to noncontrolling interests	13	19	64	64
Net income (loss) attributable to Adient	$ (321)	$ 54	$ (487)	$ (330)
Earnings per share, Basic (in dollars per share)	$ (3.43)	$ 0.58	$ (5.21)	$ (3.54)
Earnings per share, Diluted (in dollars per share)	$ (3.43)	$ 0.58	$ (5.21)	$ (3.54)
Shares used in computing earnings per share, Basic (in shares)	93.6	93.4	93.5	93.3
Shares used in computing earnings per share, Diluted (in shares)	93.6	93.7	93.5	93.3