v3.26.3
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 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Derivatives designated as hedges        
Derivative Instruments Gain Loss [Line Items]        
Gain (Loss) Recognized in Income $ (31) $ (59) $ (216) $ 369
Derivatives designated as hedges | Cross currency interest rate swaps        
Derivative Instruments Gain Loss [Line Items]        
Gain (Loss) Recognized in Income $ (10) $ (52) $ (153) $ 415
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Cost of services and sales Cost of services and sales 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 $ (18) $ (17) $ (53) $ (55)
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Interest Interest Interest Interest
Derivatives designated as hedges | Foreign currency forward contracts        
Derivative Instruments Gain Loss [Line Items]        
Gain (Loss) Recognized in Income $ 4 $ 3 $ (31) $ 2
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Cost of services and sales Cost of services and sales 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 $ (7) $ 7 $ 21 $ 7
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Total Revenue Total Revenue Total Revenue Total Revenue
Derivatives not designated as hedges | Foreign currency forward contracts        
Derivative Instruments Gain Loss [Line Items]        
Gain (Loss) Recognized in Income $ (13) $ (22) $ (5) $ 20
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Cost of services and sales Cost of services and sales Cost of services and sales Cost of services and sales