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Income Taxes - Schedule of Income Tax Expense by Fiscal Year (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Current:      
U.S. federal $ 1,879 $ 2,694 $ 2,630
State and local 251 298 293
Non-U.S. 1,854 1,281 1,324
Total current taxes 3,984 4,273 4,247
Deferred:      
U.S. federal 102 (132) (339)
State and local 9 (18) (1)
Non-U.S. 41 50 (143)
Total deferred taxes 152 (100) (483)
Total income tax provision $ 4,136 $ 4,173 $ 3,764