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Income Taxes - Income Before Taxes by Fiscal Year (Detail) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Income Tax Disclosure [Abstract]      
U.S. $ 13,339 $ 11,051 $ 11,002
Non-U.S. 7,698 7,085 5,061
Income before income taxes $ 21,037 $ 18,136 $ 16,063