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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, 2024
Dec. 31, 2023
Right-Of-Use Assets [Roll Forward]    
Right-of-use assets, beginning balance $ 117 $ 126
Additions 5 5
Depreciation (8) (12)
Change in foreign exchange rates 6 (2)
Right-of-use assets, ending balance 120 117
Land    
Right-Of-Use Assets [Roll Forward]    
Right-of-use assets, beginning balance 97 102
Additions 1 2
Depreciation (5) (5)
Change in foreign exchange rates 6 (2)
Right-of-use assets, ending balance 99 97
Buildings    
Right-Of-Use Assets [Roll Forward]    
Right-of-use assets, beginning balance 12 15
Additions 3 2
Depreciation (1) (5)
Change in foreign exchange rates 0 0
Right-of-use assets, ending balance 14 12
Vehicles    
Right-Of-Use Assets [Roll Forward]    
Right-of-use assets, beginning balance 3 2
Additions 1 1
Depreciation (1) 0
Change in foreign exchange rates 0 0
Right-of-use assets, ending balance 3 3
Equipment    
Right-Of-Use Assets [Roll Forward]    
Right-of-use assets, beginning balance 5 7
Additions 0 0
Depreciation (1) (2)
Change in foreign exchange rates 0 0
Right-of-use assets, ending balance $ 4 $ 5