Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (49)	$ 10	$ (4)	$ 43
Other comprehensive income, net of tax:
Foreign currency translation adjustments	(102)	34	40	140
Realized and unrealized gains (losses) on derivatives	(6)	14	3	39
Other comprehensive income (loss)	(108)	48	43	179
Total comprehensive income (loss)	(157)	58	39	222
Comprehensive income attributable to noncontrolling interests	11	30	49	67
Comprehensive income (loss) attributable to Adient	$ (168)	$ 28	$ (10)	$ 155