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Income Taxes - Schedule of Reconciliation of the US Statutory Federal Tax Rate (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Income Tax Disclosure [Abstract]      
U.S. federal income tax at statutory rate $ 5,081 $ 5,022 $ 4,418
State income taxes, net of federal benefit 244 258 245
Non-U.S. tax effect, net of federal benefit (775) (828) (758)
Reassessment of an uncertain tax position 0 0 (142)
Conclusion of audits 0 (223) 0
Tax position taken on certain expenses (263) 0 0
Other, net (151) (56) 1
Total income tax provision $ 4,136 $ 4,173 $ 3,764
U.S. federal income tax at statutory rate, percent 21.00% 21.00% 21.00%
State income taxes, net of federal benefit, percent 1.00% 1.00% 1.00%
Non-U.S. tax effect, net of federal benefit, percent (3.00%) (4.00%) (3.00%)
Reassessment of an uncertain tax position, percent 0.00% 0.00% (1.00%)
Conclusion of audits, percent 0.00% (1.00%) 0.00%
State tax apportionment position, percent (1.00%) 0.00% 0.00%
Other, net, percent (1.00%) 0.00% 0.00%
Income tax provision, percent 17.00% 17.00% 18.00%