Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (30)	$ 173
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	24	72
Realized and unrealized gains (losses) on derivatives	(2)	28
Other comprehensive income (loss)	22	100
Total comprehensive income (loss)	(8)	273
Comprehensive income (loss) attributable to noncontrolling interests	31	40
Comprehensive income (loss) attributable to Adient	$ (39)	$ 233