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Income Taxes - Temporary Differences And Carryforwards in Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
--- | --- | --- | --- | ---
Deferred tax assets |  |  |  |
Accrued expenses and reserves | $ 424 | $ 661 |  |
Employee and retiree benefits | 38 | 43 |  |
Property, plant and equipment | 522 | 729 |  |
Net operating loss and other credit carryforwards | 6,963 | 6,628 |  |
Research and development | 233 | 219 |  |
Intangible assets | 137 | 306 |  |
Operating lease liabilities | 327 | 294 |  |
Other, net | 315 | 455 |  |
Gross deferred tax assets | 8,959 | 9,335 |  |
Valuation allowances | (6,256) | (6,258) | $ (6,279) | $ (5,906)
Net deferred tax assets | 2,703 | 3,077 |  |
Deferred tax liabilities |  |  |  |
Subsidiaries, joint ventures and partnerships | 193 | 440 |  |
Operating lease right-of-use assets | 327 | 294 |  |
Other liabilities | 591 | 675 |  |
Gross deferred tax liabilities | 1,111 | 1,409 |  |
Net deferred tax asset | $ 1,592 | $ 1,668 |  |

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