Consolidated Statements of Income (Loss) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Net sales	$ 3,936	$ 4,158
Cost of sales	3,673	3,978
Gross profit	263	180
Selling, general and administrative expenses	165	178
Loss (gain) on divestitures - net	25	0
Restructuring and impairment costs	2	31
Equity income (loss)	(113)	83
Earnings (loss) before interest and income taxes	(42)	54
Net financing charges	48	35
Other pension expense (income)	(2)	(2)
Income (loss) before income taxes	(88)	21
Income tax provision (benefit)	54	10
Net income (loss)	(142)	11
Income (loss) attributable to noncontrolling interests	25	28
Net income (loss) attributable to Adient	$ (167)	$ (17)
Earnings per share, basic (in dollars per share)	$ (1.78)	$ (0.18)
Earnings per share, diluted (in dollars per share)	$ (1.78)	$ (0.18)
Shares used in computing earnings per share, basic (in shares)	93,700,000	93,500,000
Shares used in computing earnings per share, diluted (in shares)	93,700,000	93,500,000