Restructuring and Impairment Costs - Narrative (Details) - USD ($)	3 Months Ended			9 Months Ended
	Jun. 30, 2025	Dec. 31, 2024	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Nov. 30, 2022
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 9,000,000		$ 14,000,000	$ 42,000,000	$ 152,000,000
Noncash and other adjustments	8,000,000		2,000,000	2,000,000	(1,000,000)
Aggregate amount						$ 600,000,000
Adient Aerospace
Restructuring Cost and Reserve [Line Items]
Impairment of investment		$ 10,000,000		10,000,000
2025 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring charges	9,000,000			42,000,000
Noncash and other adjustments	$ 2,000,000			$ 4,000,000
2024 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring charges			14,000,000		$ 152,000,000
Noncash and other adjustments			$ 2,000,000