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Derivative Financial Instruments (Details 2) (Derivatives not designated as hedging instruments [Member], USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Derivative instruments gain (loss) recognized in Income    
Amount of Gain or (Loss) Recognized in Income on Derivative $ (1) $ 0
Foreign forward exchange contracts [Member] | Interest expense [Member]
   
Derivative instruments gain (loss) recognized in Income    
Amount of Gain or (Loss) Recognized in Income on Derivative $ (1) $ 0