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Fair Value Measurements - Derivatives (Details) - Foreign currency forward contracts - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Not Designated as Hedging Instrument [Member]          
Derivatives, Fair Value [Line Items]          
Notional amount of foreign currency derivatives $ 0   $ 0   $ 0
Designated as Hedges | Cash Flow Hedging          
Derivatives, Fair Value [Line Items]          
Notional amount of foreign currency derivatives 356,000,000   356,000,000   346,000,000
Fair value of foreign currency forward contracts (9,000,000)   (9,000,000)   $ 22,000,000
Cash Flow Hedge Gain (Loss) Remaining Maturity within Twelve Months     (9,000,000)    
Deferred Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months     1,000,000    
Ineffective portion relating to these hedges $ 0 $ 0 $ 0 $ 0  
Maximum length of time over which our foreign currency forward contracts mature     12 months