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Interest expense (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of detailed information about borrowings [line items]    
Capitalized interest $ 143 $ 135
Interest expense $ (1,713) $ (1,475)
Capitalisation rate of borrowing costs eligible for capitalisation 4.50% 4.31%
Interest expense on long-term debt    
Disclosure of detailed information about borrowings [line items]    
Interest expense $ (1,623) $ (1,391)
Interest expense on other debt    
Disclosure of detailed information about borrowings [line items]    
Interest expense (233) (219)
Lease liabilities    
Disclosure of detailed information about borrowings [line items]    
Interest expense $ (218) $ (193)