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Marketable Securities (current and non-current) (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Marketable securities classification    
Current marketable securities $ 1,310 $ 1,648
Non-current marketable securities 1,542 1,162
Total marketable securities 2,852 2,810
U.S. government agency securities
   
Marketable securities classification    
Current marketable securities 158 162
Non-current marketable securities 207 125
Foreign government agency securities
   
Marketable securities classification    
Current marketable securities 11 16
Non-current marketable securities 62 51
Corporate debt securities
   
Marketable securities classification    
Current marketable securities 283 471
Non-current marketable securities 523 494
Commercial paper
   
Marketable securities classification    
Current marketable securities 165 116
Certificates of deposit/time deposits
   
Marketable securities classification    
Current marketable securities 57 41
Non-current marketable securities 20 0
U.S. treasury securities
   
Marketable securities classification    
Current marketable securities 54 54
Non-current marketable securities 49 18
U.S. municipal securities
   
Marketable securities classification    
Current marketable securities 12 13
Non-current marketable securities 0 14
Asset-backed securities
   
Marketable securities classification    
Current marketable securities 570 775
Non-current marketable securities 671 453
Asset-backed securities Automobile loan related
   
Marketable securities classification    
Current marketable securities 479 567
Non-current marketable securities 417 375
Asset-backed securities Credit card related
   
Marketable securities classification    
Current marketable securities 38 123
Non-current marketable securities 117 34
Asset-backed securities Equipment lease related
   
Marketable securities classification    
Current marketable securities 42 54
Non-current marketable securities 81 36
Asset-backed securities Other asset-backed securities
   
Marketable securities classification    
Current marketable securities 11 31
Non-current marketable securities 56 8
Auction rate securities
   
Marketable securities classification    
Non-current marketable securities $ 10 $ 7