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

Restricted cash

  $ 13     $ 13  

Appeal bonds

    7       —    

Other current assets

    5       2  
   

 

 

   

 

 

 

Total

  $ 25     $ 15