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Shareholders' Equity (Tables)
9 Months Ended
Sep. 30, 2011
Stockholders' Equity [Abstract] 
Comprehensive Income
Comprehensive Income
     The components of comprehensive income, net of taxes, are as follows:
                 
    Nine Months Ended  
    September 30,  
    2011     2010  
    (In millions)  
Net income
  $ 673     $ 816  
Other comprehensive income (loss):
               
Unrealized gain on marketable securities
    1       1  
Translation adjustments
    (42 )     12  
 
           
Total comprehensive income
  $ 632     $ 829