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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, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) Recognized in Accumulated Other Comprehensive Loss (effective portion) $ (4) $ (4) $ (8) $ (7)
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 (6) 2
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) $ (2) $ 2 $ (3) $ 6