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Income Taxes - Schedule of Differences Between the U.S. Federal Statutory Income Tax Rate (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Income Tax Disclosure [Abstract] |  |  |
U.S. federal corporate statutory tax rate | 21.00% | 21.00% | 21.00%
Taxes on income at the U.S. federal statutory rate | $ 103 | $ 126 | $ 128
U.S. state and local taxes | 6 | 1 | 12
Foreign income taxed at different rates, including withholding taxes | 22 | 29 | 33
Valuation allowance | 26 | 0 | (5)
Change in tax rates | 0 | 3 | 0
GILTI and FDII | (4) | (3) | (4)
Federal research and development credits | (2) | (3) | (8)
Uncertain tax positions | 2 | (3) | 7
Non-deductible compensation | 7 | 11 | 8
Wind down of O&O media properties | 0 | (17) | 0
Return to provision adjustments | (5) | (15) | 4
Nontaxable income from partnerships | (1) | (9) | (1)
Change in indefinite reinvestment assertion | (34) | 3 | 0
Other | 0 | 0 | (4)
Income tax expense | $ 120 | $ 123 | $ 170

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