Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 45	$ 33
Other comprehensive income, net of tax:
Foreign currency translation adjustments	142	106
Realized and unrealized gains on derivatives	9	25
Other comprehensive income	151	131
Total comprehensive income	196	164
Comprehensive income attributable to noncontrolling interests	38	37
Comprehensive income attributable to Adient	$ 158	$ 127