Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 59	$ 5	$ (229)	$ 1
Other comprehensive income, net of tax:
Foreign currency translation adjustments	129	(49)	(13)	(9)
Realized and unrealized gains (losses) on derivatives	22	(23)	31	(20)
Other comprehensive income (loss)	151	(72)	18	(29)
Total comprehensive income (loss)	210	(67)	(211)	(28)
Comprehensive income attributable to noncontrolling interests	34	11	67	60
Comprehensive income (loss) attributable to Adient	$ 176	$ (78)	$ (278)	$ (88)