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Earnings Per Share
 3 Months Ended
Mar. 31, 2012
Earnings Per Share [Abstract]  
Earnings Per Share
10. Earnings per share

The following table presents the computation of basic and diluted earnings per share:

 

     Three Months Ended
March 31		  
     2012      2011  
     (in millions of U.S. dollars, except
share and per share data)		  

Numerator:

      

Net income

    $ 973      $ 250  
  

 

 

     

 

 

  

Denominator:

      

Denominator for basic earnings per share:

      

Weighted-average shares outstanding

      338,567,341        337,088,217  

Denominator for diluted earnings per share:

      

Share-based compensation plans

      3,123,641        2,572,982  
  

 

 

     

 

 

  

Adjusted weighted-average shares outstanding and assumed conversions

      341,690,982        339,661,199  
  

 

 

     

 

 

  

Basic earnings per share

    $ 2.87      $ 0.74  
  

 

 

     

 

 

  

Diluted earnings per share

    $ 2.84      $ 0.73  
  

 

 

     

 

 

  

 

Excluded from adjusted weighted-average shares outstanding and assumed conversions is the impact of securities that would have been anti-dilutive during the respective periods. For the three months ended March 31, 2012 and 2011, the potential anti-dilutive share conversions were 468,048 shares and 333,072 shares, respectively.