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Earnings per share
 6 Months Ended
Jun. 30, 2014
Earnings Per Share [Abstract]  
Earnings per share
Earnings per share

 
Three Months Ended
 
 
Six Months Ended
 
 
June 30
 
 
June 30
 
(in millions of U.S. dollars, except share and per share data)
2014

 
2013

 
2014

 
2013

Numerator:
 
 
 
 
 
 
 
Net income
$
779

 
$
891

 
$
1,513

 
$
1,844

Denominator:
 
 
 
 
 
 
 
Denominator for basic earnings per share:
 
 
 
 
 
 
 
Weighted-average shares outstanding
337,846,228

 
341,047,290

 
338,353,260

 
340,913,450

Denominator for diluted earnings per share:
 
 
 
 

 

Share-based compensation plans
3,286,359

 
3,053,975

 
3,267,499

 
3,120,263

Weighted-average shares outstanding and assumed conversions
341,132,587

 
344,101,265

 
341,620,759

 
344,033,713

Basic earnings per share
$
2.30

 
$
2.61

 
$
4.47

 
$
5.41

Diluted earnings per share
$
2.28

 
$
2.59

 
$
4.43

 
$
5.36

 
 
 
 
 
 
 
 
Potential anti-dilutive share conversions
1,778,040

 
1,811,030

 
1,220,731

 
1,231,105



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