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Fair value measurements (Tables)
9 Months Ended
Sep. 30, 2012
Fair value measurements  
Fair value, assets measured on a recurring and/or non-recurring basis
      Fair Value Measurements at  
     September 30, 2012 Using
      Quoted        
      Prices in        
      Active Significant     
      Markets for Other Significant  
     Identical Observable Unobservable  
   September 30, Assets Inputs Inputs Balance Sheet
   2012 (Level 1) (Level 2) (Level 3) Classification
Recurring fair value measurements:              
Money market funds  $ 2,774 $ 2,774 $--- $--- Cash and cash equivalents
U.S. treasuries and government agency securities   417   417  ---  --- Short-term investments
Auction rate securities ("ARS")   19  ---  ---   19 Long-term investments
Foreign exchange contract derivatives  3  ---  3  --- Other current assets
Total recurring fair value measurements  $3,213 $3,191 $3 $19  

      Fair Value Measurements at    
      December 31, 2011 Using   
      Quoted          
      Prices in          
      Active Significant       
      Markets for Other Significant   
     Identical Observable Unobservable   
   December 31, Assets Inputs Inputs Total GainsBalance Sheet
   2011 (Level 1) (Level 2) (Level 3) (Losses)Classification
Recurring fair value measurements:                
Money market funds  $2,869 $2,869 $--- $---   Cash and cash equivalents
U.S. treasuries with original maturities                
 of three months or less  2  2  ---  ---   Cash and cash equivalents
U.S. treasuries and government agency                
 securities  344  344  ---  ---   Short-term investments
ARS  16  ---  ---  16   Long-term investments
Total recurring fair value measurements  $3,231 $3,215 $--- $16    
                  
Non-recurring fair value measurements:                
Goodwill (a) $7,111 $--- $--- $7,111 $(12) 
Total non-recurring fair value                
 measurements  $7,111 $--- $--- $7,111 $(12) 
Fair value, assets measured on a recurring Unobservable Input Reconciliation
    Level 3
       Total
      financial
      assets at
     fair
    ARS (a)value
Balance at January 1, 2012 $16 $16
 Total unrealized gains included in      
  other comprehensive income  3  3
Balance at September 30, 2012 $19 $19
         

    Level 3
       Total
       financial
       assets at
      fair
    ARS (a) value
Balance at January 1, 2011 $23 $23
 Total unrealized gains included      
  in other comprehensive income  2  2
Balance at September 30, 2011 $25 $25