Earnings per share (Tables)

12 Months Ended

Dec. 31, 2020

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)	2020		2019		2018
Numerator:
Net income	$	3,533	$	4,454	$	3,962
Denominator:
Denominator for basic earnings per share:
Weighted-average shares outstanding	451,602,820		455,910,463		463,629,203
Denominator for diluted earnings per share:
Share-based compensation plans	1,838,692		3,004,200		3,173,145
Weighted-average shares outstanding       and assumed conversions	453,441,512		458,914,663		466,802,348
Basic earnings per share	$	7.82	$	9.77	$	8.55
Diluted earnings per share	$	7.79	$	9.71	$	8.49
Potential anti-dilutive share conversions	6,811,966		2,410,337		3,543,188