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Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Income Tax Disclosure [Abstract]    
Income tax provision (benefit) $ 20 $ 31
Effective tax rate 31.00% 48.00%
Unrecognized tax benefits $ 537 $ 522
Unrecognized tax benefits that would impact effective tax rate 168 122
Net accrued interest 31 25
Interest and penalties accrued $ 2 $ 2