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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 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) recognized in Accumulated Other Comprehensive Loss (effective portion) $ (3)   $ (3)  
Gain (Loss) recognized in Accumulated Other Comprehensive Loss (effective portion)   $ (4)   $ (8)
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)   (3)  
Gain (Loss) recognized in Accumulated Other Comprehensive Loss (effective portion)   (3)   (6)
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) $ 0   $ 4  
Gain (Loss) reclassified from Accumulated Other Comprehensive Loss into Income (effective portion)   $ (2)   $ (3)