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Research and Development (Details) - USD ($)
$ in Millions
12 Months Ended 48 Months Ended
Sep. 30, 2023
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 $ 31  
Amount of letters of credit outstanding $ 6  
Scenario, Forecast    
Research and Development Arrangement, Contract to Perform for Others [Line Items]    
Research and Development Arrangement, Contract to Perform for Others, Costs Incurred, Gross   $ 88