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Right of Use Assets - Reconciliation of Changes of the Right of Use Assets (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Right-Of-Use Assets [Roll Forward]    
Right-of-use assets, beginning balance $ 126 $ 95
Additions 5 40
Depreciation (12) (11)
Change in foreign exchange rates (2) 2
Right-of-use assets, ending balance 117 126
Land    
Right-Of-Use Assets [Roll Forward]    
Right-of-use assets, beginning balance 102 68
Additions 2 36
Depreciation (5) (4)
Change in foreign exchange rates (2) 2
Right-of-use assets, ending balance 97 102
Buildings    
Right-Of-Use Assets [Roll Forward]    
Right-of-use assets, beginning balance 15 20
Additions 2 0
Depreciation (5) (5)
Change in foreign exchange rates 0 0
Right-of-use assets, ending balance 12 15
Vehicles    
Right-Of-Use Assets [Roll Forward]    
Right-of-use assets, beginning balance 2 1
Additions 1 1
Depreciation 0 0
Change in foreign exchange rates 0 0
Right-of-use assets, ending balance 3 2
Equipment    
Right-Of-Use Assets [Roll Forward]    
Right-of-use assets, beginning balance 7 6
Additions 0 3
Depreciation (2) (2)
Change in foreign exchange rates 0 0
Right-of-use assets, ending balance $ 5 $ 7