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Earnings Per Share
 6 Months Ended
Jun. 30, 2011
Earnings Per Share [Abstract]  
Earnings Per Share
11. Earnings Per Share
     Basic and diluted earnings per share (“EPS”) were calculated using the following:
                                 
    Three Months Ended     Six Months Ended  
    June 30,     June 30,  
    2011     2010     2011     2010  
            (In millions)          
Numerator:
                               
Net income, as reported
  $ 291     $ 263     $ 539     $ 495  
 
Less: Net income attributable to participating securities
    (1 )     —       (1 )     —  
 
                       
Net income available to common shareholders
  $ 290     $ 263     $ 538     $ 495  
 
                       
 
Denominator:
                               
Basic EPS- weighted average shares
    141.79       152.04       143.28       153.29  
Effect of dilutive securities:
                               
Stock Options and SARS
    0.17       0.18       0.29       0.17  
 
                       
Diluted EPS- adjusted weighted average shares and assumed conversions
    141.96       152.22       143.57       153.46  
 
                       
 
Earnings Per Share:
                               
Basic
  $ 2.05     $ 1.73     $ 3.75     $ 3.23  
 
Diluted
  $ 2.05     $ 1.73     $ 3.75     $ 3.22  
     Options to purchase 0.7 million shares of common stock were excluded from the diluted earnings per share calculation because their effect would be anti-dilutive for the three and six months ended June 30, 2010.