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Research and Development (Details) - USD ($) $ in Millions | 12 Months Ended | 48 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2026
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |
Research and Development Arrangement, Contract to Perform for Others, Costs Incurred, Gross | $ 11 | $ 41 |
Amount of letters of credit outstanding | $ 6 |  |
Scenario, Forecast |  |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |
Other Research and Development Expense |  |  | $ 93

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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 605 -Name Accounting Standards Codification -Section 55 -Paragraph 15 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477548/944-605-55-15 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 605 -Name Accounting Standards Codification -Section 55 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477548/944-605-55-12 + Details
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- Definition Amount of other research and development expense. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 730 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482916/730-10-50-1 + Details
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- Definition The amount of costs incurred under a research and development arrangement accounted for as a contract to perform research and development for others. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 730 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483041/730-20-50-1 + Details
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