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intangible assets and goodwill - Business acquisition pro forma information (Details) - CAD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Pro forma Information
Reported Operating revenues	$ 14,368	$ 13,408
Reported Net income	1,624	$ 1,578
Pro forma Operating revenues	14,468
Pro forma Net income	$ 1,628
Net income per Common Share
Basic	$ 2.68	$ 2.63
Diluted	2.68	$ 2.63
Pro forma Basic	2.68
Pro forma Diluted	$ 2.68
AlarmForce Industries Inc.
Net income per Common Share
Reported Operating revenues of acquiree	$ 17
Reported Net income of acquiree	0
Xavient Information Systems
Net income per Common Share
Reported Operating revenues of acquiree	166
Reported Net income of acquiree	2
Medisys Health Group Inc.
Net income per Common Share
Reported Operating revenues of acquiree	48
Reported Net income of acquiree	$ 0

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The amount of profit (loss) attributable to ordinary equity holders of the parent entity (the numerator) divided by the weighted average number of ordinary shares outstanding during the period (the denominator).

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