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Income Taxes - Tax Effect of Temporary Differences that Give Rise to Significant Portions of Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Millions
Sep. 30, 2024
Sep. 30, 2023
Deferred Tax Assets:    
Accrued compensation and benefits $ 221 $ 212
Accrued litigation 374 365
Client incentives 855 630
Net operating loss carryforwards 206 232
Comprehensive loss 79 72
Federal benefit of state taxes 16 125
Other 102 66
Valuation allowance (212) (149)
Deferred tax assets 1,641 1,553
Deferred Tax Liabilities:    
Property, equipment and technology, net (295) (350)
Intangible assets (6,404) (6,063)
Unrealized gains on equity securities (81) (103)
Foreign taxes (22) (25)
Deferred tax liabilities (6,802) (6,541)
Net deferred tax liabilities $ (5,161) $ (4,988)