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Income Taxes (Details) - USD ($)			3 Months Ended									6 Months Ended	12 Months Ended
	Jun. 24, 2020	Jan. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Mar. 31, 2018	Sep. 30, 2018	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Income Tax Contingency [Line Items]
Net operating loss carryforwards			$ 4,000,000,000.0										$ 4,000,000,000.0
Net operating loss carryforwards set to expire between 2020 and 2039			2,600,000,000										2,600,000,000
Operating loss carryforwards, valuation allowance			2,700,000,000										2,700,000,000
Income tax expense (benefit), adjustment						$ (9,000,000)	$ 10,000,000
Deferred tax asset, increase (decrease) of valuation allowance										$ (76,000,000)
Unrecognized tax benefits			483,000,000			414,000,000				288,000,000		$ 288,000,000	483,000,000	$ 414,000,000	$ 288,000,000	$ 193,000,000
Unrecognized tax benefits that would impact effective tax rate			133,000,000										133,000,000
Net accrued interest			15,000,000			10,000,000				5,000,000		5,000,000	15,000,000	10,000,000	5,000,000
Undistributed foreign earnings			16,800,000,000										16,800,000,000
Undistributed foreign earnings deemed permanently reinvested			409,000,000										409,000,000
Income taxes paid													98,000,000	102,000,000	$ 139,000,000
Tax rate							24.90%	26.00%
Change in effective tax rate (as percent)															24.50%
Tax cuts and jobs act, change in tax rate, deferred tax asset, income tax expense															$ 106,000,000
Non-cash estimated tax expense									$ 100,000,000						100,000,000
Tax cuts and jobs act, transition tax for accumulated foreign earnings, income tax expense															4,000,000
Income tax provision (benefit)													57,000,000	410,000,000	480,000,000
Asset impairment charge								$ 66,000,000							787,000,000
Goodwill impairment								2,000,000
Fixed asset impairment charges								$ 62,000,000						66,000,000	768,000,000
Impairment of nonconsolidated partially owned affiliate													231,000,000	0	358,000,000
Impairment						$ 0					$ 0			0	0
Restructuring and impairment costs													238,000,000	176,000,000	1,181,000,000
Goodwill
Income Tax Contingency [Line Items]
Goodwill impairment											20,000,000
Automotive fabrics manufacturing
Income Tax Contingency [Line Items]
Income tax provision (benefit)			(3,000,000)
Assets held for sale | Detroit properties and airplanes
Income Tax Contingency [Line Items]
Asset impairment charge												49,000,000			49,000,000
Goodwill impairment												$ 14,000,000
YFAI
Income Tax Contingency [Line Items]
Income tax provision (benefit)			$ (12,000,000)	$ 0	$ (4,000,000)					(36,000,000)
Asset impairment charge	$ 9,000,000	$ 216,000,000		6,000,000	$ 216,000,000
Impairment of nonconsolidated partially owned affiliate										358,000,000			231,000,000		358,000,000
Seating, seat structures and mechanisms
Income Tax Contingency [Line Items]
Asset impairment charge															787,000,000
Goodwill impairment										185,000,000
Fixed asset impairment charges										787,000,000
Impairment											$ 299,000,000				299,000,000
Asia Segment
Income Tax Contingency [Line Items]
Asset impairment charge				27,000,000
Goodwill impairment				$ 5,000,000
2020 restructuring plan
Income Tax Contingency [Line Items]
Restructuring and impairment costs													205,000,000
2020 restructuring plan | Restructuring charges
Income Tax Contingency [Line Items]
Income tax provision (benefit)													(6,000,000)
2020 restructuring plan | Asia Segment
Income Tax Contingency [Line Items]
Restructuring and impairment costs													$ 10,000,000
2019 restructuring plan
Income Tax Contingency [Line Items]
Net restructuring and impairment costs														92,000,000
Tax charge (benefit) for restructuring														(5,000,000)
Restructuring and impairment costs														105,000,000
2019 restructuring plan | Asia Segment
Income Tax Contingency [Line Items]
Restructuring and impairment costs														$ 8,000,000
2018 restructuring plan
Income Tax Contingency [Line Items]
Net restructuring and impairment costs															46,000,000
Tax charge (benefit) for restructuring															6,000,000
Restructuring and impairment costs															71,000,000
2018 restructuring plan | Asia Segment
Income Tax Contingency [Line Items]
Restructuring and impairment costs															$ 10,000,000
GAAS
Income Tax Contingency [Line Items]
Income tax expense (benefit), adjustment									$ (7,000,000)
Tax rate									15.00%						25.00%
Foreign tax authority | Ireland
Income Tax Contingency [Line Items]
Statutory tax rate (as percent)													12.50%	12.50%	12.50%
Non-cash estimated tax expense													$ 332,000,000	$ 503,000,000	$ 554,000,000
Income tax provision (benefit)													57,000,000	410,000,000	480,000,000
Goodwill impairment													$ 9,000,000	$ 0	$ (21,000,000)
Foreign tax authority | Canada
Income Tax Contingency [Line Items]
Deferred tax asset, increase (decrease) of valuation allowance										6,000,000
Foreign tax authority | Luxembourg
Income Tax Contingency [Line Items]
Income tax expense (benefit), adjustment							$ 229,000,000
Tax rate							17.00%	18.00%
Foreign tax authority | United Kingdom
Income Tax Contingency [Line Items]
Income tax expense (benefit), adjustment							$ 25,000,000
Foreign tax authority | Poland
Income Tax Contingency [Line Items]
Income tax expense (benefit), adjustment								$ 43,000,000
Deferred tax asset, increase (decrease) of valuation allowance										8,000,000
Foreign tax authority | Belgium
Income Tax Contingency [Line Items]
Deferred tax asset, increase (decrease) of valuation allowance										12,000,000
Foreign tax authority | Germany
Income Tax Contingency [Line Items]
Deferred tax asset, increase (decrease) of valuation allowance										175,000,000
Foreign tax authority | Hungary
Income Tax Contingency [Line Items]
Deferred tax asset, increase (decrease) of valuation allowance										14,000,000
Foreign tax authority | Mexico
Income Tax Contingency [Line Items]
Deferred tax asset, increase (decrease) of valuation allowance										117,000,000
Foreign tax authority | Romania
Income Tax Contingency [Line Items]
Deferred tax asset, increase (decrease) of valuation allowance										9,000,000
United States
Income Tax Contingency [Line Items]
Deferred tax asset, increase (decrease) of valuation allowance										$ 281,000,000

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