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Derivative Instruments - Location and Fair Values of Cash Flow Hedges (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Cash Flow Hedging | Foreign exchange forward contracts | Designated as Hedging Instrument | Prepaid and other current assets    
Derivatives, Fair Value [Line Items]    
Derivative, fair value $ 3 $ 3