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Research and Development (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 48 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Sep. 30, 2026
Research and Development Arrangement, Contract to Perform for Others [Line Items]          
Other Research and Development Expense $ 12 $ 6 $ 29 $ 24  
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