Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 2	$ (126)	$ (140)	$ (115)
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	(141)	40	(82)	56
Realized and unrealized gains (losses) on derivatives	(62)	4	(47)	1
Other comprehensive income (loss)	(203)	44	(129)	57
Total comprehensive income (loss)	(201)	(82)	(269)	(58)
Comprehensive income (loss) attributable to noncontrolling interests	4	28	38	56
Comprehensive income (loss) attributable to Adient	$ (205)	$ (110)	$ (307)	$ (114)