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Derivative Instruments - Narrative (Details) - Foreign exchange forward contracts
$ in Millions
3 Months Ended
Mar. 31, 2019
USD ($)
Fair Value Hedging | Not Designated as Hedging Instrument  
Derivative [Line Items]  
Aggregate notional value $ 85
Net gain (loss) on derivative 2
Cash Flow Hedging | Designated as Hedging Instrument  
Derivative [Line Items]  
Aggregate notional value $ 254
Maturity of derivatives 12 months
Net gains (losses) related to derivatives recorded in other comprehensive income (loss) expected to be reclassified into earnings $ (7)