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Income Taxes - Schedule of Income (Loss) Before Income Taxes (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Income Tax Disclosure [Abstract]      
Domestic $ 580 $ 305 $ (346)
Foreign 116 35 (1,491)
Income (loss) before income taxes $ 696 $ 340 $ (1,837)