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Derivative Instruments and Hedging Activities - Effect of Derivative Instruments Designated as Cash Flow Hedges and Not Designated as Hedges on Consolidated Statement of Income (Detail) - Cash Flow Hedging - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Derivatives designated as hedges    
Derivative Instruments Gain Loss [Line Items]    
Gain (Loss) Recognized in Income $ (122) $ 112
Derivatives designated as hedges | Cross currency interest rate swaps    
Derivative Instruments Gain Loss [Line Items]    
Gain (Loss) Recognized in Income $ (103) $ 136
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Cost of services and sales Cost of services and sales
Derivatives designated as hedges | Cross currency interest rate swaps    
Derivative Instruments Gain Loss [Line Items]    
Gain (Loss) Recognized in Income $ (17) $ (19)
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Interest Interest
Derivatives designated as hedges | Foreign currency forward contracts    
Derivative Instruments Gain Loss [Line Items]    
Gain (Loss) Recognized in Income $ (16) $ (1)
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Cost of services and sales Cost of services and sales
Derivatives designated as hedges | Foreign currency forward contracts    
Derivative Instruments Gain Loss [Line Items]    
Gain (Loss) Recognized in Income $ 14 $ (4)
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Total Revenue Total Revenue
Derivatives not designated as hedges | Foreign currency forward contracts    
Derivative Instruments Gain Loss [Line Items]    
Gain (Loss) Recognized in Income $ (5) $ 25
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Cost of services and sales Cost of services and sales