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Other Assets (Tables)
 12 Months Ended
Dec. 31, 2011
Other/Current Assets [Abstract]  
Other assets
                 
    December 31,  
    2011     2010  
    (In millions)  

Debt issuance costs

   $ 24     $ 17  

Interest rate swap

     95       19  

Other prepaid assets

     9       10  
   

 

 

    

 

 

  

Total

   $ 128     $ 46