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Research and Development (Details) - USD ($)
$ in Millions
3 Months Ended 48 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Sep. 30, 2026
Research and Development Arrangement, Contract to Perform for Others [Line Items]      
Other Research and Development Expense $ 7 $ 9  
Amount of letters of credit outstanding $ 6    
Forecast      
Research and Development Arrangement, Contract to Perform for Others [Line Items]      
Other Research and Development Expense     $ 88