Consolidated Statements of Income (Loss) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Statement of Financial Position [Abstract]
Net sales	$ 3,511	$ 4,228	$ 7,447	$ 8,386
Cost of sales	3,274	4,031	6,947	8,009
Gross profit	237	197	500	377
Selling, general and administrative expenses	127	168	292	346
Loss (gain) on divestitures - net	0	0	25	0
Restructuring and impairment costs	52	113	54	144
Equity income (loss)	8	62	(105)	145
Earnings (loss) before interest and income taxes	66	(22)	24	32
Net financing charges	50	40	98	75
Other pension expense (income)	(2)	0	(4)	(2)
Income (loss) before income taxes	18	(62)	(70)	(41)
Income tax provision (benefit)	16	64	70	74
Net income (loss)	2	(126)	(140)	(115)
Income (loss) attributable to noncontrolling interests	21	23	46	51
Net income (loss) attributable to Adient	$ (19)	$ (149)	$ (186)	$ (166)
Earnings per share, basic (in dollars per share)	$ (0.20)	$ (1.59)	$ (1.98)	$ (1.78)
Earnings per share, diluted (in dollars per share)	$ (0.20)	$ (1.59)	$ (1.98)	$ (1.78)
Shares used in computing earnings per share, basic (in shares)	93,800,000	93,500,000	93,800,000	93,500,000
Shares used in computing earnings per share, diluted (in shares)	93,800,000	93,500,000	93,800,000	93,500,000