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Earnings per share
3 Months Ended
Mar. 31, 2013
Earnings Per Share [Abstract]  
Earnings per share
Earnings per share

The following table presents the computation of basic and diluted earnings per share: 
 
Three Months Ended
 
 
March 31
 
(in millions of U.S. dollars, except share and per share data)
2013

 
2012

Numerator:
 
 
 
Net income
$
953

 
$
973

Denominator:
 
 
 
Denominator for basic earnings per share:
 
 
 
Weighted-average shares outstanding
340,778,142

 
338,567,341

Denominator for diluted earnings per share:
 
 
 
Share-based compensation plans
3,128,226

 
3,123,641

Adjusted weighted-average shares outstanding and assumed conversions
343,906,368

 
341,690,982

Basic earnings per share
$
2.80

 
$
2.87

Diluted earnings per share
$
2.77

 
$
2.84

 
 
 
 
Potential anti-dilutive share conversions
634,385

 
468,048



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.