Restructuring and Impairment Costs (Tables)

12 Months Ended

Sep. 30, 2021

Restructuring and Related Activities [Abstract]

Schedule of restructuring reserve

The restructuring actions are expected to be substantially completed in fiscal 2022.

(in millions)	Employee Severance and Termination Benefits		Total
Original reserve	$	27	$	27
Utilized—cash	(5)		(5)
Balance at September 30, 2021	$	22	$	22

The following table summarizes the changes in Adient's 2020 Plan reserve:

(in millions)	Employee Severance and Termination Benefits		Other		Currency Translation		Total
Original Reserve	$	203	$	2	$	—	$	205
Utilized—cash	(35)		—		—		(35)
Noncash adjustment—other	—		(2)		1		(1)
Balance at September 30, 2020	$	168	$	—	$	1	$	169
Utilized—cash	$	(87)	$	—	$	—	(87)
Noncash adjustment—underspend/other	$	(6)	$	—	$	1	(5)
Balance at September 30, 2021	$	75	$	—	$	2	$	77

The following table summarizes the changes in Adient's 2019 Plan reserve:

(in millions)	Employee Severance and Termination Benefits		Other		Currency Translation		Total
Original Reserve	$	101	$	4	$	—	$	105
Utilized—cash	(32)		—		—		(32)
Utilized—noncash	—		(1)		(2)		(3)
Balance at September 30, 2019	$	69	$	3	$	(2)	$	70
Utilized—cash	(30)		—		—		(30)
Utilized—noncash	—		—		2		2
Noncash adjustment—underspend	(7)		—		—		(7)
Balance at September 30, 2020	$	32	$	3	$	—	$	35
Utilized—cash	(24)		—		—		(24)
Noncash adjustment—underspend/other	—		(3)		1		(2)
Balance at September 30, 2021	$	8	$	—	$	1	$	9