Earnings per share (Tables)

6 Months Ended

Jun. 30, 2018

Earnings Per Share [Abstract]

Schedule Of Earnings Per Share, Basic And Diluted

	Three Months Ended				Six Months Ended
	June 30				June 30
(in millions of U.S. dollars, except share and per share data)	2018		2017		2018		2017
Numerator:
Net income	$	1,294	$	1,305	$	2,376	$	2,398
Denominator:
Denominator for basic earnings per share:
Weighted-average shares outstanding	465,276,597		467,981,077		465,488,724		468,244,458
Denominator for diluted earnings per share:
Share-based compensation plans	3,103,727		3,872,860		3,489,013		3,900,678
Weighted-average shares outstanding and assumed conversions	468,380,324		471,853,937		468,977,737		472,145,136
Basic earnings per share	$	2.78	$	2.79	$	5.10	$	5.12
Diluted earnings per share	$	2.76	$	2.77	$	5.07	$	5.08
Potential anti-dilutive share conversions	3,814,491		2,066,578		3,305,735		1,467,556