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Income Taxes - Schedule of Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Sep. 30, 2024
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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)

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