Earnings per share (Tables)

12 Months Ended

Dec. 31, 2016

Earnings Per Share [Abstract]

Schedule Of Earnings Per Share, Basic And Diluted

	Year Ended December 31
(in millions of U.S. dollars, except share and per share data)	2016		2015		2014
Numerator:
Net income	$	4,135	$	2,834	$	2,853
Denominator:
Denominator for basic earnings per share:
Weighted-average shares outstanding	462,519,789		325,589,361		335,609,899
Denominator for diluted earnings per share:
Share-based compensation plans	3,429,610		3,246,017		3,376,388
Weighted-average shares outstanding       and assumed conversions	465,949,399		328,835,378		338,986,287
Basic earnings per share	$	8.94	$	8.71	$	8.50
Diluted earnings per share	$	8.87	$	8.62	$	8.42
Potential anti-dilutive share conversions	1,206,828		1,601,668		1,024,788