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Income Taxes - Significant Components of Company's Income Tax Provision from Continuing Operations (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Income Tax Disclosure [Abstract]
Tax expense at Ireland statutory rate of 12.5%	$ 246	$ 190	$ 139
U.S. state income tax, net of federal benefit	60	42	30
Income subject to the U.S. federal tax rate	117	63	42
Income subject to rates different than the statutory rate	(181)	(204)	44
Reserve and valuation allowance adjustments	14	(139)	(559)
Intellectual property transactions and adjustments	0	0	(176)
Impact of acquisitions and divestitures	0	121	0
Restructuring and impairment costs	(11)	38	12
Income tax provision (benefit)	$ 245	$ 111	$ (468)

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