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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
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Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Income Tax Disclosure [Abstract] |  |  |
U.S. federal income tax at statutory rate | $ 4,418 | $ 3,809 | $ 3,373
State income taxes, net of federal benefit | 245 | 216 | 222
Non-U.S. tax effect, net of federal benefit | (758) | (588) | (505)
Remeasurement of deferred tax balances | 0 | 0 | 1,007
Reassessment of an uncertain tax position | (142) | 0 | 0
Conclusion of audits | 0 | 0 | (255)
State tax apportionment position | 0 | (176) | 0
Other, net | 1 | (82) | (90)
Total income tax provision | $ 3,764 | $ 3,179 | $ 3,752
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%) | (3.00%) | (3.00%)
Remeasurement of deferred tax liability, percent | 0.00% | 0.00% | 6.00%
Reassessment of an uncertain tax position, percent | (1.00%) | 0.00% | 0.00%
Conclusion of audits, percent | 0.00% | 0.00% | (2.00%)
State tax apportionment position, percent | 0.00% | (1.00%) | 0.00%
Other, net, percent | 0.00% | 0.00% | 0.00%
Income tax provision, percent | 18.00% | 18.00% | 23.00%

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