Income Taxes - Narrative (Details) - USD ($)		3 Months Ended											12 Months Ended
	Jun. 24, 2020	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 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, 2021	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Income Tax Contingency [Line Items]
Net operating loss carryforwards		$ 4,200,000,000											$ 4,200,000,000
Net operating loss carryforwards set to expire between 2020 and 2039		2,500,000,000											2,500,000,000
Operating loss carryforwards, valuation allowance		2,800,000,000											2,800,000,000
Income tax provision (benefit)													249,000,000	$ 57,000,000	$ 410,000,000
Income tax expense (benefit), adjustment									$ (9,000,000)	$ 10,000,000
Unrecognized tax benefits		499,000,000				$ 483,000,000			414,000,000				499,000,000	483,000,000	414,000,000	$ 288,000,000
Unrecognized tax benefits that would impact effective tax rate		129,000,000											129,000,000
Net accrued interest		18,000,000				15,000,000			$ 10,000,000				18,000,000	15,000,000	10,000,000
Unremitted earnings of foreign subsidiaries		32,000,000				41,000,000							32,000,000	41,000,000
Income taxes paid													78,000,000	98,000,000	102,000,000
Tax on gain on disposition of equity method investment				$ 5,000,000
Effective income tax rate										24.90%	26.00%
Audit settlement tax benefit		3,000,000
Restructuring and impairment costs													21,000,000	238,000,000	176,000,000
Long-lived asset impairment charges					$ 9,000,000		$ 6,000,000				$ 66,000,000
Benefit associated with impairment charge on goodwill											$ (2,000,000)		0	(9,000,000)	0
China
Income Tax Contingency [Line Items]
Income tax benefit from tax exempt income		2,000,000	$ 11,000,000
Yanfeng
Income Tax Contingency [Line Items]
Tax on gain on disposition of equity method investment		134,000,000
Asia
Income Tax Contingency [Line Items]
Long-lived asset impairment charges							27,000,000
Benefit associated with impairment charge on goodwill							5,000,000
Asia | China
Income Tax Contingency [Line Items]
Long-lived asset impairment charges						$ 5,000,000
Automotive Fabrics Manufacturing
Income Tax Contingency [Line Items]
Income tax provision (benefit)		(3,000,000)
YFAI
Income Tax Contingency [Line Items]
Income tax provision (benefit)		$ (12,000,000)					0	$ (4,000,000)
Long-lived asset impairment charges	$ 9,000,000						$ 6,000,000	$ 216,000,000
SJA
Income Tax Contingency [Line Items]
Equity method investment, realized gain (loss) on disposal			33,000,000	$ 33,000,000									33,000,000
2020 restructuring plan
Income Tax Contingency [Line Items]
Restructuring and impairment costs														205,000,000
2020 restructuring plan | Asia
Income Tax Contingency [Line Items]
Restructuring and impairment costs														10,000,000
2020 restructuring plan | Restructuring charges
Income Tax Contingency [Line Items]
Income tax provision (benefit)														$ (6,000,000)
2019 restructuring plan
Income Tax Contingency [Line Items]
Restructuring and impairment costs															105,000,000
Net restructuring and impairment costs															92,000,000
Tax benefit, restructuring charges															5,000,000
2019 restructuring plan | Asia
Income Tax Contingency [Line Items]
Restructuring and impairment costs															$ 8,000,000
GAAS
Income Tax Contingency [Line Items]
Income tax expense (benefit), adjustment												$ (7,000,000)
Foreign tax authority | Czech Republic
Income Tax Contingency [Line Items]
Income tax provision (benefit)													5,000,000
Foreign tax authority | Korea
Income Tax Contingency [Line Items]
Income tax provision (benefit)													5,000,000
Foreign tax authority | Mexico
Income Tax Contingency [Line Items]
Income tax provision (benefit)													8,000,000
Foreign tax authority | Other Jurisdictions
Income Tax Contingency [Line Items]
Income tax provision (benefit)													$ 4,000,000
Foreign tax authority | Luxembourg
Income Tax Contingency [Line Items]
Income tax expense (benefit), adjustment										$ 229,000,000
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
Foreign tax authority | Secretariat of the Federal Revenue Bureau of Brazil
Income Tax Contingency [Line Items]
Income tax provision (benefit)			10,000,000		3,000,000
Gain on indirect tax recoveries			$ 30,000,000		$ 8,000,000