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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 |

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