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Income Taxes (Tables) | 12 Months Ended
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Sep. 30, 2025
Income Tax Disclosure [Abstract] |
Schedule of Income Before Taxes by Fiscal Year | The Company’s income before income taxes by fiscal year consisted of the following:
| For the Years Ended September 30,
| 2025 |  | 2024 |  | 2023
| (in millions)
U.S. | $ | 14,776 |  |  | $ | 14,537 |  |  | $ | 13,339 |
Non-U.S. | 9,418 |  |  | 9,379 |  |  | 7,698 |
Total income before income taxes | $ | 24,194 |  |  | $ | 23,916 |  |  | $ | 21,037 |
Schedule of Income Tax Expense by Fiscal Year | Income tax provision by fiscal year consisted of the following:
| For the Years Ended September 30,
| 2025 |  | 2024 |  | 2023
| (in millions)
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 |
Schedule of Components of Deferred Tax Assets and Liabilities | The following table presents the components of deferred tax assets and liabilities:
| September 30,
| 2025 |  | 2024
| (in millions)
Deferred tax assets: |  |  |
Accrued compensation and benefits | $ | 250 |  |  | $ | 221 |
Accrued litigation | 690 |  |  | 374 |
Client incentives | 288 |  |  | 855 |
Net operating loss carryforwards | 258 |  |  | 206 |
Comprehensive loss | 206 |  |  | 79 |
Federal benefit of state taxes | 74 |  |  | 16 |
Other | 26 |  |  | 102 |
Valuation allowance | (264) |  |  | (212) |
Total deferred tax assets | 1,528 |  |  | 1,641 |
Deferred tax liabilities: |  |  |
Property, equipment and technology, net | (296) |  |  | (295) |
Intangible assets | (6,532) |  |  | (6,404) |
Unrealized gains on equity securities | (71) |  |  | (81) |
Foreign taxes | (50) |  |  | (22) |
Total deferred tax liabilities | (6,949) |  |  | (6,802) |
Net deferred tax liabilities | $ | (5,421) |  |  | $ | (5,161) |
Schedule of Reconciliation of the US Statutory Federal Tax Rate | The following table presents a reconciliation of the income tax provision to the amount of income tax determined by applying the U.S. federal statutory income tax rate to income before income taxes:
| For the Years Ended September 30,
| 2025 |  | 2024 |  | 2023
| (in millions, except percentages)
U.S. federal income tax at statutory rate | $ | 5,081 |  |  | 21 | % |  | $ | 5,022 |  |  | 21 | % |  | $ | 4,418 |  |  | 21 | %
State income taxes, net of federal benefit | 244 |  |  | 1 | % |  | 258 |  |  | 1 | % |  | 245 |  |  | 1 | %
Non-U.S. tax effect, net of federal benefit | (775) |  |  | (3 | %) |  | (828) |  |  | (4 | %) |  | (758) |  |  | (3 | %)
Reassessment of an uncertain tax position | — |  |  | — | % |  | — |  |  | — | % |  | (142) |  |  | (1 | %)
Conclusion of audits | — |  |  | — | % |  | (223) |  |  | (1 | %) |  | — |  |  | — | %
Tax position taken on certain expenses | (263) |  |  | (1 | %) |  | — |  |  | — | % |  | — |  |  | — | %
Other, net | (151) |  |  | (1 | %) |  | (56) |  |  | — | % |  | 1 |  |  | — | %
Income tax provision | $ | 4,136 |  |  | 17 | % |  | $ | 4,173 |  |  | 17 | % |  | $ | 3,764 |  |  | 18 | %
Schedule of Reconciliation of Beginning and Ending Unrecognized Tax Benefits by Fiscal Year | The following table presents a reconciliation of beginning and ending unrecognized tax benefits by fiscal year:
| 2025 |  | 2024 |  | 2023
| (in millions)
Balance as of beginning of period | $ | 3,750 |  |  | $ | 3,497 |  |  | $ | 2,683 |
Increase related to prior years | 281 |  |  | 148 |  |  | 515 |
Decrease related to prior years | (2,455) |  |  | (322) |  |  | (190) |
Increase related to current year | 150 |  |  | 556 |  |  | 510 |
Decrease related to settlements with taxing authorities | (49) |  |  | (127) |  |  | (17) |
Decrease related to lapsing statute of limitations | (5) |  |  | (2) |  |  | (4) |
Balance as of end of period | $ | 1,672 |  |  | $ | 3,750 |  |  | $ | 3,497 |

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