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Income Taxes - Reconciliation of Unrecognized Tax Benefits (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Reconciliation of Unrecognized Tax Benefits      
Unrecognized tax benefits — beginning of year $ 26 $ 5 $ 3
Additions for tax positions of the current year 4 3 2
Decreases for tax positions taken in prior years (11) 0 0
Increases for tax positions taken in prior years 0 19 1
Settlements with tax authorities/statute lapses (1) (1) (1)
Unrecognized tax benefits — end of year $ 18 $ 26 $ 5