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Interest expense (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of detailed information about borrowings [line items]    
Interest expense $ (1,110) $ (1,125)
Capitalized interest 49 45
Total interest expense $ (1,110) $ (1,125)
Capitalisation rate of borrowing costs eligible for capitalisation 3.95% 3.96%
Long-term Debt    
Disclosure of detailed information about borrowings [line items]    
Interest expense $ (1,072) $ (1,017)
Other    
Disclosure of detailed information about borrowings [line items]    
Interest expense (87) (153)
Lease liabilities    
Disclosure of detailed information about borrowings [line items]    
Total interest expense $ (199) $ (213)