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Derivative Instruments - Location and Amounts of Pre-Tax Gains (Losses) on Cash Flow Hedges (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Derivative Instruments, Gain (Loss) [Line Items]    
Gain recognized in Accumulated Other Comprehensive Loss (effective portion) $ 4  
Gain recognized in Accumulated Other Comprehensive Loss (effective portion)   $ 1
Foreign exchange forward contracts | Designated as Hedging Instrument | Cash Flow Hedging    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain recognized in Accumulated Other Comprehensive Loss (effective portion) 4  
Gain recognized in Accumulated Other Comprehensive Loss (effective portion)   1
Foreign exchange forward contracts | Revenue, Selling and general expenses | Designated as Hedging Instrument | Cash Flow Hedging    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain reclassified from Accumulated Other Comprehensive Loss into Income (effective portion) $ 2  
Gain reclassified from Accumulated Other Comprehensive Loss into Income (effective portion)   $ 1