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Segment Information (Details)				3 Months Ended									12 Months Ended
	Jun. 24, 2020 USD ($)	Jan. 31, 2020 USD ($)	Oct. 25, 2019 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Sep. 30, 2020 USD ($) segment	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)
Segment Reporting Information [Line Items]
Reportable segments | segment													3
Net Sales													$ 12,670,000,000	$ 16,526,000,000	$ 17,439,000,000
Corporate - related costs													(16,000,000)	(9,000,000)	(55,000,000)
Becoming Adient costs													0	0	(62,000,000)
Restructuring and impairment costs													(238,000,000)	(176,000,000)	(1,181,000,000)
Purchase accounting amortization													(40,000,000)	(44,000,000)	(69,000,000)
Restructuring related charges													(20,000,000)	(31,000,000)	(61,000,000)
Gain (loss) On deconsolidation													(13,000,000)	0	0
Impairment of nonconsolidated partially owned affiliate													231,000,000	0	358,000,000
Depreciation													(295,000,000)	(278,000,000)	(393,000,000)
Stock based compensation													(15,000,000)	(20,000,000)	(37,000,000)
Earnings (loss) before interest and income taxes													(195,000,000)	229,000,000	(1,020,000,000)
Net financing charges													(220,000,000)	(182,000,000)	(144,000,000)
Other pension income (expense)													(14,000,000)	(45,000,000)	43,000,000
Income (loss) before income taxes													(429,000,000)	2,000,000	(1,121,000,000)
Asset impairment charge									$ 66,000,000						787,000,000
Impairment of assets held for sale								$ 12,000,000		$ 6,000,000			21,000,000	18,000,000
Held for sale asset impairments													8,000,000
Fixed asset impairment charges									$ 62,000,000					66,000,000	768,000,000
Impairment of goodwill								$ 0				$ 0		0	0
Loss on business divestitures - net													13,000,000	0	0
Depreciation													295,000,000	278,000,000	400,000,000
Integration-related costs													15,000,000	3,000,000
Income tax provision (benefit)													57,000,000	410,000,000	480,000,000
Cost of sales													12,078,000,000	15,725,000,000	16,535,000,000
China
Segment Reporting Information [Line Items]
Impairment of assets held for sale													9,000,000
Miscellaneous | China
Segment Reporting Information [Line Items]
Asset impairment charge													24,000,000
RECARO
Segment Reporting Information [Line Items]
Loss on business divestitures - net							$ 21,000,000						101,000,000
Adient Aerospace
Segment Reporting Information [Line Items]
Gain (loss) On deconsolidation			$ 4,000,000
YFAI
Segment Reporting Information [Line Items]
Impairment of nonconsolidated partially owned affiliate											$ 358,000,000		231,000,000		358,000,000
Asset impairment charge	$ 9,000,000	$ 216,000,000			$ 6,000,000		216,000,000
Tax adjustments													1,000,000	2,000,000
Income tax provision (benefit)				$ (12,000,000)	0		$ (4,000,000)				(36,000,000)
Yanfeng
Segment Reporting Information [Line Items]
Gain on completion of transaction			$ 12,000,000
Corporate joint venture | YFAI
Segment Reporting Information [Line Items]
Income tax provision (benefit)															8,000,000
Futuris
Segment Reporting Information [Line Items]
Integration-related costs														4,000,000	22,000,000
Restructuring related charges
Segment Reporting Information [Line Items]
Depreciation															7,000,000
Becoming adient costs
Segment Reporting Information [Line Items]
Stock based compensation															10,000,000
Restatement adjustment
Segment Reporting Information [Line Items]
Prior period adjustment															8,000,000
Cost of sales					8,000,000
Seating, seat structures and mechanisms
Segment Reporting Information [Line Items]
Asset impairment charge															787,000,000
Impairment of assets held for sale															49,000,000
Fixed asset impairment charges											$ 787,000,000
Pre-tax impairment charge															1,086,000,000
Impairment of goodwill												$ 299,000,000			299,000,000
Consulting fees															11,000,000
Americas Segment
Segment Reporting Information [Line Items]
Impairment of assets held for sale														6,000,000
Fixed asset impairment charges														11,000,000
Americas Segment | RECARO
Segment Reporting Information [Line Items]
Loss on business divestitures - net						$ 21,000,000							21,000,000
EMEA Segment
Segment Reporting Information [Line Items]
Fixed asset impairment charges														55,000,000
EMEA Segment | RECARO
Segment Reporting Information [Line Items]
Loss on business divestitures - net													80,000,000
Asia Segment
Segment Reporting Information [Line Items]
Asset impairment charge					27,000,000
Impairment of assets held for sale														12,000,000
Asia Segment | China
Segment Reporting Information [Line Items]
Asset impairment charge				$ 5,000,000
Asia Segment | Miscellaneous
Segment Reporting Information [Line Items]
Asset impairment charge					$ 24,000,000
Asia Segment | RECARO
Segment Reporting Information [Line Items]
Loss on business divestitures - net													0
Reportable Segments | Americas Segment
Segment Reporting Information [Line Items]
Net Sales													5,889,000,000	7,785,000,000	7,664,000,000
Adjusted EBITDA													228,000,000	210,000,000	302,000,000
Depreciation													128,000,000	109,000,000	141,000,000
Reportable Segments | EMEA Segment
Segment Reporting Information [Line Items]
Net Sales													5,148,000,000	6,675,000,000	7,436,000,000
Adjusted EBITDA													101,000,000	161,000,000	364,000,000
Depreciation													129,000,000	126,000,000	204,000,000
Reportable Segments | Asia Segment
Segment Reporting Information [Line Items]
Net Sales													1,822,000,000	2,337,000,000	2,659,000,000
Adjusted EBITDA													424,000,000	513,000,000	625,000,000
Depreciation													38,000,000	43,000,000	45,000,000
Reportable Segments | Asia Segment | China
Segment Reporting Information [Line Items]
Net Sales													517,000,000	529,000,000	716,000,000
Eliminations
Segment Reporting Information [Line Items]
Net Sales													(189,000,000)	(271,000,000)	(320,000,000)
Corporate-related costs
Segment Reporting Information [Line Items]
Corporate - related costs													$ (80,000,000)	$ (97,000,000)	$ (95,000,000)

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