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Income Taxes - Information that Causes the Income Tax Expense to Differ from the Amount of Income Tax Determined by Applying the Applicable U.S. Federal Statutory Rate of 35% to Pretax Income (Detail) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Income Tax Disclosure [Abstract]      
U.S. federal income tax at statutory rate $ 5,022 $ 4,418 $ 3,809
State income taxes, net of federal benefit 258 245 216
Non-U.S. tax effect, net of federal benefit (828) (758) (588)
Reassessment of an uncertain tax position 0 (142) 0
Conclusion of audits (223) 0 0
State tax apportionment position 0 0 (176)
Other, net (56) 1 (82)
Total income tax provision $ 4,173 $ 3,764 $ 3,179
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 (4.00%) (3.00%) (3.00%)
Reassessment of an uncertain tax position, percent 0.00% (1.00%) 0.00%
Conclusion of audits, percent (1.00%) 0.00% 0.00%
State tax apportionment position, percent 0.00% 0.00% (1.00%)
Other, net, percent 0.00% 0.00% 0.00%
Income tax provision, percent 17.00% 18.00% 18.00%