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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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