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Cash, Cash Equivalents and Marketable Securities (Details)
$ in Millions
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
security
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Cash, Cash Equivalents and Marketable Securities        
Cash and cash equivalents $ 4,907 $ 4,315 $ 3,323 $ 2,384
Marketable securities 13,527 6,884    
Total cash and cash equivalents, and marketable securities 18,434 $ 11,199    
Number of positions in a continuous loss position for 12 months or longer | security   0    
U.S. government securities        
Cash, Cash Equivalents and Marketable Securities        
Marketable securities 5,948 $ 2,830    
U.S. government agency securities        
Cash, Cash Equivalents and Marketable Securities        
Marketable securities 4,475 2,710    
Corporate debt securities        
Cash, Cash Equivalents and Marketable Securities        
Marketable securities 3,104 1,344    
Cash        
Cash, Cash Equivalents and Marketable Securities        
Cash and cash equivalents 1,703 2,162    
Money market funds        
Cash, Cash Equivalents and Marketable Securities        
Cash and cash equivalents 2,409 2,153    
U.S. government securities        
Cash, Cash Equivalents and Marketable Securities        
Cash and cash equivalents 597 0    
U.S. government agency securities        
Cash, Cash Equivalents and Marketable Securities        
Cash and cash equivalents 145 0    
Corporate debt securities        
Cash, Cash Equivalents and Marketable Securities        
Cash and cash equivalents $ 53 $ 0