Earnings per share

12 Months Ended

Dec. 31, 2018

Earnings Per Share [Abstract]

Earnings per share

Earnings per share

	Year Ended December 31
(in millions of U.S. dollars, except share and per share data)	2018		2017		2016
Numerator:
Net income	$	3,962	$	3,861	$	4,135
Denominator:
Denominator for basic earnings per share:
Weighted-average shares outstanding	463,629,203		467,145,716		462,519,789
Denominator for diluted earnings per share:
Share-based compensation plans	3,173,145		4,051,185		3,429,610
Weighted-average shares outstanding       and assumed conversions	466,802,348		471,196,901		465,949,399
Basic earnings per share	$	8.55	$	8.26	$	8.94
Diluted earnings per share	$	8.49	$	8.19	$	8.87
Potential anti-dilutive share conversions	3,543,188		1,776,025		1,206,828

Excluded from weighted-average shares outstanding and assumed conversions is the impact of securities that would have been anti-dilutive during the respective years.