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Derivative Instruments - Narrative (Details) - Foreign exchange forward contracts - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Fair Value Hedging | Not Designated as Hedging Instrument    
Derivative [Line Items]    
Aggregate notional value $ 156  
Net loss on derivative 1  
Cash Flow Hedging | Designated as Hedging Instrument    
Derivative [Line Items]    
Aggregate notional value $ 275 $ 255
Maturity of derivatives 12 months  
Net gains related to derivatives recorded in other comprehensive income (loss) expected to be reclassified into earnings $ 3