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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, 2023
Sep. 30, 2022
Deferred Tax Assets:    
Accrued compensation and benefits $ 212 $ 172
Accrued litigation obligation 365 331
Client incentives 630 442
Net operating loss carryforwards 232 117
Comprehensive loss 72 21
Federal benefit of state taxes 125 133
Other 66 71
Valuation allowance (149) (120)
Deferred tax assets 1,553 1,167
Deferred Tax Liabilities:    
Property, equipment and technology, net (350) (450)
Intangible assets (6,063) (5,788)
Unrealized gains on equity securities (103) (124)
Foreign taxes (25) (50)
Deferred tax liabilities (6,541) (6,412)
Net deferred tax liabilities $ (4,988) $ (5,245)