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Tax Effect of Temporary Differences that Give Rise to Significant Portions of Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Millions
Sep. 30, 2018
Sep. 30, 2017
Deferred Tax Assets    
Accrued compensation and benefits $ 135 $ 194
Accrued litigation obligation 329 373
Client incentives 213 272
Net operating loss carryforwards 34 45
Comprehensive loss 17 29
Federal benefit of state taxes 120 236
Other 127 193
Valuation allowance (34) (35)
Deferred tax assets 941 1,307
Deferred Tax Liabilities    
Property, equipment and technology, net (286) (391)
Intangible assets (5,153) (6,756)
Foreign taxes (106) (59)
Deferred tax liabilities (5,545) (7,206)
Net deferred tax liabilities $ (4,604) $ (5,899)