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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, 2024
Sep. 30, 2023
Sep. 30, 2022
Income Tax Disclosure [Abstract]      
Tax expense at Ireland statutory rate of 12.5% $ 190 $ 139 $ 139
U.S. state income tax, net of federal benefit 42 30 (26)
Income subject to the U.S. federal tax rate 63 42 (101)
Income subject to rates different than the statutory rate (204) 44 67
Reserve and valuation allowance adjustments (139) (559) (301)
Intellectual property transactions and adjustments 0 (176) 0
Impact of acquisitions and divestitures 121 0 0
Restructuring and impairment costs 38 12 40
Income tax provision (benefit) $ 111 $ (468) $ (182)