Per share amounts (Tables)

12 Months Ended

Dec. 31, 2018

Disclosure Of Per Share Amounts [Abstract]

Disclosure of detailed information about basic and diluted earnings per share [text block]

Basic and diluted net earnings per share have been determined based on the following:

	Year Ended
($M except per share amounts)	Dec 31, 2018	Dec 31, 2017
Net earnings	271,650	62,258
Basic weighted average shares outstanding ('000s)	140,619	120,582
Dilutive impact of equity based compensation ('000s)	1,716	1,826
Diluted weighted average shares outstanding ('000s)	142,335	122,408
Basic earnings per share	1.93	0.52
Diluted earnings per share	1.91	0.51