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Leases - Lease Liabilities and Expense (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Lease liabilities [abstract]      
Lease liabilities $ 1,584 $ 1,690  
Less: current portion 185 189  
Non-current lease liabilities 1,399 1,501  
Expenses relating to short-term leases 450 409  
Interest expense on lease liabilities 62 67 $ 70
Variable lease payments not included in the measurement of lease liabilities 65 85  
Total cash outflows for leases 1,089 983  
Increase through capitalization of short-term leases, property, plant and equipment $ 303 $ 197