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Income Taxes - Schedule of Provisions for Income Taxes (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Current expense (benefit):      
Federal $ 0 $ (25) $ (1)
State 14 12 37
Foreign 50 32 49
Total current expense (benefit) 64 19 85
Deferred expense (benefit):      
Federal (41) 82 34
State 8 34 (21)
Foreign (13) (64) (433)
Total deferred expense (benefit) (46) 52 (420)
Total income tax expense (benefit) $ 18 $ 71 $ (335)