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Earnings per share
 12 Months Ended
Dec. 31, 2012
Earnings Per Share [Abstract]  
Earnings per share
Earnings per share
As discussed in Note 1, the following table presents the computation of basic and diluted earnings per share:
 
 
Years Ended December 31
 
 (in millions of U.S. dollars, except share and per share data)
2012

 
2011

 
2010

Numerator:
 
 
 
 
 
Net income
$
2,706

 
$
1,540

 
$
3,085

Denominator:
 
 
 
 
 
Denominator for basic earnings per share:
 
 
 
 
 
Weighted-average shares outstanding
339,843,438

 
338,159,409

 
339,685,143

Denominator for diluted earnings per share:
 
 
 
 
 
Share-based compensation plans
2,903,512

 
2,620,815

 
1,561,244

Adjusted weighted-average shares outstanding and assumed conversions
342,746,950

 
340,780,224

 
341,246,387

Basic earnings per share
$
7.96

 
$
4.55

 
$
9.08

Diluted earnings per share
$
7.89

 
$
4.52

 
$
9.04

Potential anti-dilutive share conversions
896,591

 
111,326

 
256,868



Excluded from adjusted weighted-average shares outstanding and assumed conversions is the impact of securities that would have been anti-dilutive during the respective years.