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Derivative Instruments - Location and Amounts of Pre-Tax Gains (Losses) on Cash Flow Hedges (Details) - Foreign exchange forward contracts - Designated as Hedging Instrument - Cash Flow Hedging - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) Recognized in Accumulated Other Comprehensive Loss (effective portion) $ 3 $ 1 $ 2 $ 3
Selling and general expenses        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss into Income (effective portion) $ 2 $ 1 $ 6 $ 3