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Interest expense (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Disclosure of detailed information about borrowings [line items]    
Capitalized interest $ 128 $ 63
Total interest expense $ (1,146) $ (1,082)
Capitalisation rate of borrowing costs eligible for capitalisation 3.83% 3.83%
Long-term Debt    
Disclosure of detailed information about borrowings [line items]    
Interest expense $ (1,148) $ (1,088)
Other    
Disclosure of detailed information about borrowings [line items]    
Interest expense (126) (57)
Lease liabilities    
Disclosure of detailed information about borrowings [line items]    
Total interest expense $ (165) $ (177)