Consolidated Statements of Income (Loss) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Net sales	$ 4,158	$ 4,204
Cost of sales	3,978	4,003
Gross profit	180	201
Selling, general and administrative expenses	178	196
Restructuring and impairment costs	31	0
Equity income (loss)	83	96
Earnings (loss) before interest and income taxes	54	101
Net financing charges	35	33
Other pension expense (income)	(2)	(1)
Income (loss) before income taxes	21	69
Income tax provision (benefit)	10	265
Net income (loss)	11	(196)
Income (loss) attributable to noncontrolling interests	28	20
Net income (loss) attributable to Adient	$ (17)	$ (216)
Earnings per share, basic (in dollars per share)	$ (0.18)	$ (2.32)
Earnings per share, diluted (in dollars per share)	(0.18)	(2.32)
Cash dividends declared per share (in dollars per share)	$ 0.275	$ 0.275
Shares used in computing earnings per share, basic (in shares)	93.5	93.2
Shares used in computing earnings per share, diluted (in shares)	93.5	93.2