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Income Taxes - Narrative (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Sep. 30, 2024 USD ($) component | Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) | Sep. 30, 2021 USD ($)
Income Tax Contingency [Line Items] |  |  |  |
Foreign tax rate differential | $ 9 | $ 22 | $ (1) |
Tax rate differential from mix of income and losses in the significant jurisdictions | 20 | 33 | 9 |
Tax from nonconsolidated partially owned affiliates | 11 | 11 | 8 |
Net operating loss carryforwards | 4,700 |  |  |
Net operating loss carryforwards set to expire between 2025 and 2044 | 2,400 |  |  |
Operating loss carryforwards, valuation allowance | 3,400 |  |  |
Unrecognized tax benefits | 422 | 527 | 499 | $ 499
Unrecognized tax benefits that would impact effective tax rate | 106 |  |  |
Net accrued interest | 21 | 31 | 22 |
Settlements with taxing authorities | 115 | 11 | 3 |
Benefit from settlements with taxing authorities | 63 |  |  |
Unremitted earnings of foreign subsidiaries | 39 | 38 |  |
Income taxes paid | 96 | 94 | 77 |
Income tax provision | $ 32 | 0 | 94 |
Number of components | component | 2 |  |  |
Receita Federal do Brasil |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Tax adjustments |  |  | 32 |
Income tax provision |  |  | 4 |
Foreign tax authority |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Increase in valuation allowance | $ 38 |  |  |
Foreign tax authority | State Administration of Taxation, China |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Decrease in valuation allowance | 14 |  |  |
Foreign tax authority | Mexico |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Decrease in valuation allowance | 8 |  |  |
Increase in valuation allowance | 5 |  |  |
Deferred tax asset, release of valuation allowance |  | $ 114 |  |
Foreign tax authority | Ministry of the Economy, Finance and Industry, France |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Decrease in valuation allowance | 7 |  |  |
Foreign tax authority | Japan |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Decrease in valuation allowance | 6 |  |  |
Increase in valuation allowance |  |  | 3 |
Foreign tax authority | National Revenue Administration, Poland |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Increase in valuation allowance | $ 14 |  |  |
Foreign tax authority | Canada |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Increase in valuation allowance |  |  | 12 |
Foreign tax authority | Other Jurisdictions |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Decrease in valuation allowance |  |  | 2 |
Increase in valuation allowance |  |  | 3 |
Foreign tax authority | Czech Tax Authority |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Decrease in valuation allowance |  |  | $ 11 |

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