Earnings per share (Tables)

9 Months Ended

Sep. 30, 2018

Earnings Per Share [Abstract]

Schedule Of Earnings Per Share, Basic And Diluted

	Three Months Ended					Nine Months Ended
	September 30					September 30
(in millions of U.S. dollars, except share and per share data)	2018		2017			2018		2017
Numerator:
Net income (loss)	$	1,231	$	(70	)	$	3,607	$	2,328
Denominator:
Denominator for basic earnings per share:
Weighted-average shares outstanding	462,981,973		466,370,784			464,644,013		467,658,334
Denominator for diluted earnings per share:
Share-based compensation plans	3,034,525		—			3,360,511		3,961,572
Weighted-average shares outstanding and assumed conversions	466,016,498		466,370,784			468,004,524		471,619,906
Basic earnings (loss) per share	$	2.66	$	(0.15	)	$	7.76	$	4.98
Diluted earnings (loss) per share	$	2.64	$	(0.15	)	$	7.71	$	4.94
Potential anti-dilutive share conversions	3,763,844		2,045,829			3,467,000		1,673,777