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Miscellaneous financial information - Narrative (Details) - CAD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2025	Sep. 30, 2025	Dec. 31, 2024
Restructuring Cost and Reserve [Line Items]
Property, Plant and Equipment, Net	$ 30,225	$ 30,225	$ 30,807
Employee Severance
Restructuring Cost and Reserve [Line Items]
Restructuring charges	330	330
Calgary Imperial Campus
Restructuring Cost and Reserve [Line Items]
Property, Plant and Equipment, Net	60	$ 60
Corporate and other | Calgary Imperial Campus
Restructuring Cost and Reserve [Line Items]
Tangible asset impairment charges	$ 406

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