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Derivative Instruments and Hedging Activities - Effect of Derivative Instruments Designated as Fair Value and Cash Flow Hedges and Not Designated as Hedges on Consolidated Statement of (Loss) Income (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Derivatives not designated as hedges | Foreign exchange contracts | Cost of services/sales        
Derivative Instruments Gain Loss [Line Items]        
Gain (Loss) Recognized in Income   $ (17) $ (8) $ 15
Fair Value Hedging | Derivatives designated as hedges | Cross currency swaps | Interest expense        
Derivative Instruments Gain Loss [Line Items]        
Gain (Loss) Recognized in Income   6   (6)
Cash Flow Hedging | Derivatives designated as hedges        
Derivative Instruments Gain Loss [Line Items]        
Gain (Loss) Recognized in Income $ (5) (32) (47) 28
Cash Flow Hedging | Derivatives designated as hedges | Cross currency swaps | Interest expense        
Derivative Instruments Gain Loss [Line Items]        
Gain (Loss) Recognized in Income (2) (30) (40) 25
Cash Flow Hedging | Derivatives designated as hedges | Foreign exchange contracts | Cost of services/sales        
Derivative Instruments Gain Loss [Line Items]        
Gain (Loss) Recognized in Income $ (3) $ (2) $ (7) $ 3