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Lease Liabilities - Summary of Lease Liabilities (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Lease liabilities [abstract]      
Lease Liabilities, Beginning of Year $ 2,957 $ 1,757  
Acquisitions (Note 5) 0 1,441  
Additions 25 110  
Interest Expense (Note 7) 163 171 $ 87
Lease Payments (465) (471)  
Modifications 83 22  
Re-measurements 7 (4)  
Terminations (5) (1)  
Transfers to Liabilities Related to Assets Held for Sale (Note 18) 0 (10)  
Exchange Rate Movements and Other 71 (58)  
Lease Liabilities, End of Year 2,836 2,957 $ 1,757
Less: Current Portion 308 272  
Long-Term Portion $ 2,528 $ 2,685