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Marketable Securities (Details 2) (USD $)
In Millions
Jun. 30, 2011
Dec. 31, 2010
Marketable securities by contractual maturity    
Due in one year or less $ 809  
Due after one year through three years 685  
Due after three years through five years 43  
Due after five years 18  
Total marketable securities $ 1,555 $ 1,641