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Lease Liabilities - Summary of Lease Liabilities (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Lease liabilities [abstract]      
Beginning balance, lease liabilities $ 1,757 $ 1,916  
Acquisition 1,441 0  
Additions 110 49  
Interest Expense 171 87 $ 82
Lease Payments (471) (284)  
Terminations 1 1  
Modifications 22 (2)  
Re-measurements (4) (2)  
Exchange Rate Movements and Other (10) (6)  
Lease liability transfers (58) 0  
Ending Balance, lease liabilities 2,957 1,757 $ 1,916
Less: Current Portion 272 184  
Long-Term Portion $ 2,685 $ 1,573