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CASH, CASH EQUIVALENTS, AND MARKETABLE SECURITIES (Tables)
 12 Months Ended
Dec. 31, 2012
Fair Value, by Balance Sheet Grouping

The following table summarizes, by major security type, our cash, cash equivalents, and marketable securities that are measured at fair value on a recurring basis and are categorized using the fair value hierarchy (in millions):

 

     December 31, 2012  
      Cost or
Amortized
Cost		      Gross
Unrealized
Gains		      Gross
Unrealized
Losses		     Total
Estimated
Fair
Value		  

Cash

    $ 2,595         —           —        $ 2,595   

Level 1 securities:

           

Money market funds

      5,561         —           —          5,561   

Equity securities

      2         —           —          2   

Level 2 securities:

           

Foreign government and agency securities

      763         9         —          772   

U.S. government and agency securities

      1,809         3         (2 )      1,810   

Corporate debt securities

      719         6         —          725   

Asset-backed securities

      49         —           —          49   

Other fixed income securities

      33         —           —          33   
  

 

 

     

 

 

     

 

 

    

 

 

  
   $ 11,531       $ 18       $ (2 )    $ 11,547   
  

 

 

     

 

 

     

 

 

    

Less: Restricted cash, cash equivalents, and marketable securities (1)

              (99 ) 
          

 

 

  

Total cash, cash equivalents, and marketable securities

            $ 11,448   
          

 

 

  

 

     December 31, 2011  
      Cost or
Amortized
Cost		      Gross
Unrealized
Gains		      Gross
Unrealized
Losses		     Total
Estimated
Fair
Value		  

Cash

    $ 1,207         —           —        $ 1,207   

Level 1 securities:

           

Money market funds

      3,651         —           —          3,651   

Equity securities

      2         —           (1 )      1   

Level 2 securities:

           

Foreign government and agency securities

      1,627         14         (1 )      1,640   

U.S. government and agency securities

      2,592         3         (2 )      2,593   

Corporate debt securities

      562         3         (2 )      563   

Asset-backed securities

      56         —           (1 )      55   

Other fixed income securities

      22         —           —          22   
  

 

 

     

 

 

     

 

 

    

 

 

  
   $ 9,719       $ 20       $ (7 )    $ 9,732   
  

 

 

     

 

 

     

 

 

    

Less: Restricted cash, cash equivalents, and marketable securities (1)

              (156 ) 
          

 

 

  

Total cash, cash equivalents, and marketable securities

            $ 9,576   
          

 

 

  

 

(1) We are required to pledge or otherwise restrict a portion of our cash, cash equivalents, and marketable securities as collateral for standby and trade letters of credit, guarantees, debt, and real estate lease agreements. We classify cash and marketable securities with use restrictions of less than twelve months as “Accounts receivable, net and other” and of twelve months or longer as non-current “Other assets” on our consolidated balance sheets. See “Note 8—Commitments and Contingencies.”
Realized Gain (Loss) on Investments

The following table summarizes gross gains and gross losses realized on sales of available-for-sale marketable securities (in millions):

 

     Year Ended
December 31,		  
     2012      2011      2010  

Realized gains

    $ 20       $ 15       $ 5   

Realized losses

      10         11         4   
Investments Classified by Contractual Maturity Date

The following table summarizes the maturities of our cash equivalent and marketable fixed-income securities as of December 31, 2012 (in millions):

 

      Amortized
Cost		      Estimated
Fair Value		  

Due within one year

    $ 6,689       $ 6,691   

Due after one year through five years

      1,968         1,981   

Due after five years

      277         278   
  

 

 

     

 

 

  
   $ 8,934       $ 8,950