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Income Taxes - Summary of Income Tax Holiday (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Income Tax Disclosure [Abstract]      
Tax impact related to tax holidays $ 414 $ 363 $ 284
Impact of tax holiday on diluted earnings per share (in USD per share) $ 1.42 $ 1.26 $ 0.99
Income tax payments, net of refunds $ 653 $ 629 $ 532