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Basis of financial statement preparation (Details) - CAD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Related Party Transaction [Line Items]        
Amounts from related parties included in revenues [1] $ 11,994 $ 13,215 $ 35,668 $ 38,812
Purchases of crude oil and products [2] 7,776 8,734 22,747 25,296
Related Party        
Related Party Transaction [Line Items]        
Amounts from related parties included in revenues 3,345 3,755 10,340 10,829
Purchases of crude oil and products $ 1,619 1,955 $ 4,188 5,177
Previously Reported | Related Party        
Related Party Transaction [Line Items]        
Amounts from related parties included in revenues   2,999   8,674
Purchases of crude oil and products   $ 1,199   $ 3,022
[1]
(a) Amounts from related parties included in revenues (note 1)3,345 3,755 10,340 10,829 
[2]
(b) Amounts to related parties included in purchases of crude oil and products (note 1)1,619 1,955 4,188 5,177