Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (60)	$ 94	$ (90)	$ 267
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	9	(35)	33	37
Realized and unrealized gains (losses) on derivatives	4	(11)	2	17
Other comprehensive income (loss)	13	(46)	35	54
Total comprehensive income (loss)	(47)	48	(55)	321
Comprehensive income (loss) attributable to noncontrolling interests	22	16	53	56
Comprehensive income (loss) attributable to Adient	$ (69)	$ 32	$ (108)	$ 265