Earnings per share (Tables)

9 Months Ended

Sep. 30, 2013

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)	2013		2012		2013		2012
Numerator:
Net income	$	916	$	640	$	2,760	$	1,941
Denominator:
Denominator for basic earnings per share:
Weighted-average shares outstanding	340,888,648		340,207,037		340,905,322		339,523,388
Denominator for diluted earnings per share:
Share-based compensation plans	2,929,089		2,665,676		3,146,728		2,831,798
Weighted-average shares outstanding and assumed conversions	343,817,737		342,872,713		344,052,050		342,355,186
Basic earnings per share	$	2.68	$	1.88	$	8.09	$	5.71
Diluted earnings per share	$	2.66	$	1.86	$	8.02	$	5.67
Potential anti-dilutive share conversions	1,215,884		1,449,610		1,429,514		1,193,839