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Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2024
Mar. 31, 2023
Income Tax Disclosure [Abstract]        
Income tax provision $ 8 $ 25 $ 28 $ 56
Effective tax rate (20.00%) 71.00% 117.00% 57.00%
Unrecognized tax benefits $ 519 $ 522 $ 519 $ 522
Unrecognized tax benefits that would impact effective tax rate 153 125 153 125
Net accrued interest 27 27 27 27
Interest and penalties accrued 1 $ 2 3 $ 4
Audit settlement tax benefit $ 14   $ 17