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Research and Development (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 48 Months Ended
--- | --- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2024 | Mar. 31, 2023 | Sep. 30, 2026
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |  |  |
Other Research and Development Expense | $ 8 | $ 2 | $ 17 | $ 18 |
Amount of letters of credit outstanding | $ 6 |  | $ 6 |  |
Forecast |  |  |  |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |  |  |
Other Research and Development Expense |  |  |  |  | $ 88

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