Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (40)	$ 1,190	$ (486)
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	(250)	16	(69)
Realized and unrealized gains (losses) on derivatives	0	20	(20)
Pension and postretirement plans	1	1	0
Other comprehensive income (loss)	(249)	37	(89)
Total comprehensive income (loss)	(289)	1,227	(575)
Comprehensive income (loss) attributable to noncontrolling interests	49	81	68
Comprehensive income (loss) attributable to Adient	$ (338)	$ 1,146	$ (643)