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Lease Liabilities - Summary of Lease Liabilities (Details) - CAD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Lease liabilities [abstract]          
Beginning balance, lease liabilities     $ 1,757    
Acquisition     1,441    
Additions     101    
Interest Expense $ 43 $ 22 129 $ 66  
Lease Payments     (351)    
Modifications     6    
Re-measurement     (5)    
Exchange Rate Movements and Other     (3)    
Ending Balance, lease liabilities 3,075   3,075    
Less: Current Portion 286   286   $ 184
Long-Term Portion $ 2,789   $ 2,789   $ 1,573