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Earnings per share (Tables)
9 Months Ended
Sep. 30, 2015
Earnings Per Share [Abstract]  
Schedule Of Earnings Per Share, Basic And Diluted
 
Three Months Ended
 
 
Nine Months Ended
 
 
September 30
 
 
September 30
 
(in millions of U.S. dollars, except share and per share data)
2015

 
2014

 
2015

 
2014

Numerator:
 
 
 
 
 
 
 
Net income
$
528

 
$
785

 
$
2,151

 
$
2,298

Denominator:
 
 
 
 
 
 
 
Denominator for basic earnings per share:
 
 
 
 
 
 
 
Weighted-average shares outstanding
324,210,936

 
334,472,324

 
325,904,502

 
337,083,498

Denominator for diluted earnings per share:
 
 
 
 

 

Share-based compensation plans
2,962,484

 
3,201,656

 
3,269,724

 
3,298,569

Weighted-average shares outstanding and assumed conversions
327,173,420

 
337,673,980

 
329,174,226

 
340,382,067

Basic earnings per share
$
1.63

 
$
2.35

 
$
6.60

 
$
6.82

Diluted earnings per share
$
1.62

 
$
2.32

 
$
6.53

 
$
6.75

Potential anti-dilutive share conversions
1,907,815

 
1,227,575

 
1,503,830

 
1,410,340