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Geographical Information - Revenue (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Revenue by Geographical Area    
Revenue $ 2,502 $ 1,458
United States
   
Revenue by Geographical Area    
Revenue 1,129 681
Rest of the World
   
Revenue by Geographical Area    
Revenue $ 1,373 [1] $ 777 [1]
[1] No individual country exceeded 10% of our total revenue for any period presented