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Business segments - Table Narrative (Detail) - CAD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Segment Reporting Information [Line Items]
Revenue from contracts with customers		$ 9,696	$ 10,404	$ 29,390	$ 30,915
Revenue outside the scope of ASC 606		2,298	2,811	6,278	7,897
Revenues including federal excise tax	[1]	11,994	13,215	35,668	38,812
United States Exports
Segment Reporting Information [Line Items]
Revenues including federal excise tax		$ 2,404	$ 2,631	$ 7,110	$ 7,641
[1] (a) Amounts from related parties included in revenues (note 1) 3,345  3,755  10,340  10,829

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