Earnings per share (Tables)

3 Months Ended

Mar. 31, 2018

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)	2018		2017
Numerator:
Net income	$	1,082	$	1,093
Denominator:
Denominator for basic earnings per share:
Weighted-average shares outstanding	465,703,240		468,903,086
Denominator for diluted earnings per share:
Share-based compensation plans	3,770,351		3,828,604
Weighted-average shares outstanding and assumed conversions	469,473,591		472,731,690
Basic earnings per share	$	2.32	$	2.33
Diluted earnings per share	$	2.30	$	2.31
Potential anti-dilutive share conversions	2,116,188		969,654