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Leases - Lease Liabilities and Expense (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Lease liabilities [abstract]      
Lease liabilities $ 1,555 $ 1,540  
Less: current portion 298 244  
Non-current lease liabilities 1,257 1,296  
Expenses relating to short-term leases 403 410  
Interest expense on lease liabilities 64 60 $ 62
Variable lease payments not included in the measurement of lease liabilities 59 49  
Total cash outflows for leases 1,325 1,204  
Increase through capitalization of short-term leases, property, plant and equipment $ 514 $ 453