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Investments And Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2011
Investments And Fair Value Measurements [Abstract]  
Short-Term Investments
     December 31,  
     2011      2010  

Overnight investments, time deposits and Repurchase agreements

    $         131       $         844   

Corporate and bank notes

      1,808         2,685   

U. S. government agency mortgages

      502         605   

U.S. government agency notes

      -         -   

Commingled funds

      1,274         190   

Other

      3         4   
  

 

 

     

 

 

  
   $ 3,718       $ 4,328   
  

 

 

     

 

 

  
Short-Term Investments By Contractual Maturity

Due in one year or less

    $          2,904   

Due between one year and three years

      312   

Due after three years

      502   
  

 

 

  
   $ 3,718   
  

 

 

  
Summary Of Assets And Liabilities Measured At Fair Value On Recurring Basis
(in millions)    Fair Value Measurements as of December 31, 2011  
Description    Total      Level 1      Level 2      Level 3  

Short-term investments 1, 2

           

Money market funds

    $       1,278       $       1,278       $       -       $       -   

Government agency investments

      502         -         502         -   

Repurchase agreements

      128         -         128         -   

Corporate obligations

      1,102         -         1,102         -   

Bank notes / Certificates of deposit / Time deposits

      708         -         708         -   
  

 

 

     

 

 

     

 

 

     

 

 

  
     3,718         1,278         2,440         -   

Restricted cash and short-term investments 1

     738         738         -         -   

Fuel derivative contracts, net 1

     95         -         95         -   
  

 

 

     

 

 

     

 

 

     

 

 

  

Total

    $ 4,551       $ 2,016       $ 2,535       $ -   

1 Unrealized gains or losses on short-term investments, restricted cash and short-term investments and derivatives qualifying for hedge accounting are recorded in Accumulated other comprehensive income (loss) at each measurement date.

2 The Company's short-term investments mature in one year or less except for $87 million of Bank notes/Certificates of deposit/Time deposits, $502 million of U.S. Government agency investments and $225 million of Corporate obligations which have maturity dates exceeding one year.