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Derivatives Balance Sheet Location (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Foreign Exchange Contract [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount $ 125 $ 119
Interest Rate Swap [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 150  
Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 109  
Net Investment Hedging [Member] | Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Fair Value, Net $ (30) $ (23)