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Income Taxes - Income Before Taxes by Fiscal Year (Detail) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Income Tax Disclosure [Abstract]      
U.S. $ 9,178 $ 9,536 $ 8,088
Non-U.S. 4,612 5,348 4,718
Total income before taxes $ 13,790 $ 14,884 $ 12,806