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Nonconsolidated Partially-Owned Affiliates - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2024
Schedule of Equity Method Investments [Line Items] |  |  |
Investments in partially-owned affiliates | $ 303 |  | $ 338
KEIPER | Supply Commitment |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Reduction in cost of revenue | 25 | $ 14 |
Reduction in equity income | 34 | $ 17 |
Asia |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Non-cash impairment charges | 3 |  |
EMEA |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Non-cash impairment charges | $ 3 |  |

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