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Income Taxes - Summary of Changes in Unrecognized Tax Benefits (Details)
$ in Millions
6 Months Ended
Mar. 31, 2025
USD ($)
Income Tax Disclosure [Abstract]  
Balance at beginning of period $ 65
Decreases related to positions taken in prior years (5)
Increases related to positions taken in the current year 2
Increases related to positions taken in the prior year 1
Balance at end of period $ 63