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Earnings per share (Tables)
 9 Months Ended
Sep. 30, 2017
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)
2017

 
2016

 
2017

 
2016

Numerator:
 
 
 
 
 
 
 
Net income (loss)
$
(70
)
 
$
1,360

 
$
2,328

 
$
2,525

Denominator:
 
 
 
 
 
 
 
Denominator for basic earnings per share:
 
 
 
 
 
 
 
Weighted-average shares outstanding
466,370,784

 
468,021,093

 
467,658,334

 
460,631,794

Denominator for diluted earnings per share:
 
 
 
 
 
 
 
Share-based compensation plans
—

 
3,375,269

 
3,961,572

 
3,439,017

Weighted-average shares outstanding and assumed conversions
466,370,784

 
471,396,362

 
471,619,906

 
464,070,811

Basic earnings (loss) per share
$
(0.15
)
 
$
2.90

 
$
4.98

 
$
5.48

Diluted earnings (loss) per share
$
(0.15
)
 
$
2.88

 
$
4.94

 
$
5.44

Potential anti-dilutive share conversions
2,045,829

 
1,306,710

 
1,673,777

 
1,635,337