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Derivative instruments (Details 3) (Foreign currency contracts [Member], Interest and other income, net [Member], USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Foreign currency contracts [Member] | Interest and other income, net [Member]
   
Location in the Condensed Consolidated Statements of Income and the amount of gain (loss) recognized in earnings for our derivative instruments not designated as hedging instruments    
Amount of gain (loss) recognized in interest and other income, net $ (16) $ (10)