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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 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) recognized in Accumulated Other Comprehensive Loss (effective portion) $ (3)   $ 0  
Gain (Loss) recognized in Accumulated Other Comprehensive Loss (effective portion)   $ (5)   $ (4)
Foreign exchange forward contracts | Designated as Hedging Instrument | Cash Flow Hedging        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) recognized in Accumulated Other Comprehensive Loss (effective portion) (3)   0  
Gain (Loss) recognized in Accumulated Other Comprehensive Loss (effective portion)   (4)   (3)
Foreign exchange forward contracts | Revenue, Selling and general expenses | Designated as Hedging Instrument | Cash Flow Hedging        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) reclassified from Accumulated Other Comprehensive Loss into Income (effective portion) $ 1   $ 4  
Gain (Loss) reclassified from Accumulated Other Comprehensive Loss into Income (effective portion)   $ (1)   $ (1)