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Other Assets
 6 Months Ended
Jun. 30, 2011
Other Assets [Abstract]  
Other Assets
5. Other Assets
     Other assets were as follows:
                 
    June 30,     December 31,  
    2011     2010  
    (In millions)  
Debt issuance costs
  $ 16     $ 17  
Interest rate swap
    30       19  
Other prepaid assets
    10       10  
 
           
Total
  $ 56     $ 46