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Interest expense (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure of detailed information about borrowings [line items]    
Capitalized interest $ 135 $ 128
Interest expense $ (1,475) $ (1,146)
Capitalisation rate of borrowing costs eligible for capitalisation 4.31% 3.83%
Long-term Debt    
Disclosure of detailed information about borrowings [line items]    
Interest expense $ (1,391) $ (1,148)
Other    
Disclosure of detailed information about borrowings [line items]    
Interest expense (219) (126)
Lease liabilities    
Disclosure of detailed information about borrowings [line items]    
Interest expense $ (193) $ (165)