Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (308)	$ 73	$ (423)	$ (266)
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	(24)	(250)	32	(32)
Realized and unrealized gains (losses) on derivatives	5	(18)	6	(18)
Other comprehensive income (loss)	(19)	(268)	38	(50)
Total comprehensive income (loss)	(327)	(195)	(385)	(316)
Comprehensive income (loss) attributable to noncontrolling interests	14	4	70	64
Comprehensive income (loss) attributable to Adient	$ (341)	$ (199)	$ (455)	$ (380)