Earnings per share (Tables)

3 Months Ended

Mar. 31, 2015

Earnings Per Share [Abstract]

Schedule Of Earnings Per Share, Basic And Diluted

	Three Months Ended
	March 31
(in millions of U.S. dollars, except share and per share data)	2015		2014
Numerator:
Net income	$	681	$	734
Denominator:
Denominator for basic earnings per share:
Weighted-average shares outstanding	328,212,376		338,869,562
Denominator for diluted earnings per share:
Share-based compensation plans	3,480,344		3,171,174
Weighted-average shares outstanding and assumed conversions	331,692,720		342,040,736
Basic earnings per share	$	2.08	$	2.16
Diluted earnings per share	$	2.05	$	2.14
Potential anti-dilutive share conversions	715,148		657,182