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Marketable Securities (Contractual maturity) (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Marketable securities by contractual maturity    
Due in one year or less $ 436  
Due after one year through five years 2,032  
Due after five years through ten years 50  
Due after ten years 0  
Total marketable securities $ 2,518 $ 2,810