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Other Assets (Tables)
 9 Months Ended
Sep. 30, 2012
Other Current Assets/Other Assets [Abstract]  
Other assets
                 
    September 30,
2012		     December 31,
2011		  
    (In millions)  

Debt issuance costs

   $ 27     $ 24  

Interest rate swap

     116       95  

Other prepaid assets

     11       9  
   

 

 

    

 

 

  

Total

   $ 154     $ 128