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Other Current Assets (Tables)
6 Months Ended
Jun. 30, 2011
Other Assets [Abstract]  
Other current assets
                 
    June 30,     December 31,  
    2011     2010  
    (In millions)  
Prepaid income taxes
  $ 92     $ —  
Restricted cash
    13       13  
Other current assets
    1       2  
 
           
Total
  $ 106     $ 15