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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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