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Earnings per share
 9 Months Ended
Sep. 30, 2014
Earnings Per Share [Abstract]  
Earnings per share
Earnings per share

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

 
2013

 
2014

 
2013

Numerator:
 
 
 
 
 
 
 
Net income
$
785

 
$
916

 
$
2,298

 
$
2,760

Denominator:
 
 
 
 
 
 
 
Denominator for basic earnings per share:
 
 
 
 
 
 
 
Weighted-average shares outstanding
334,472,324

 
340,888,648

 
337,083,498

 
340,905,322

Denominator for diluted earnings per share:
 
 
 
 

 

Share-based compensation plans
3,201,656

 
2,929,089

 
3,298,569

 
3,146,728

Weighted-average shares outstanding and assumed conversions
337,673,980

 
343,817,737

 
340,382,067

 
344,052,050

Basic earnings per share
$
2.35

 
$
2.68

 
$
6.82

 
$
8.09

Diluted earnings per share
$
2.32

 
$
2.66

 
$
6.75

 
$
8.02

 
 
 
 
 
 
 
 
Potential anti-dilutive share conversions
1,227,575

 
1,215,884

 
1,410,340

 
1,429,514



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