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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, 2022
Dec. 31, 2021
Right-Of-Use Assets [Roll Forward]    
Right-of-use assets, beginning balance $ 95 $ 141
Additions 40 1
Acquisitions   13
Depreciation (11) (11)
Disposal of assets   (41)
Transfers   (8)
Change in foreign exchange rates 2  
Right-of-use assets, ending balance 126 95
Land    
Right-Of-Use Assets [Roll Forward]    
Right-of-use assets, beginning balance 68 58
Additions 36 0
Acquisitions   13
Depreciation (4) (3)
Disposal of assets   0
Transfers   0
Change in foreign exchange rates 2  
Right-of-use assets, ending balance 102 68
Buildings    
Right-Of-Use Assets [Roll Forward]    
Right-of-use assets, beginning balance 20 24
Additions 0 1
Acquisitions   0
Depreciation (5) (5)
Disposal of assets   0
Transfers   0
Change in foreign exchange rates 0  
Right-of-use assets, ending balance 15 20
Vehicles    
Right-Of-Use Assets [Roll Forward]    
Right-of-use assets, beginning balance 1 1
Additions 1 0
Acquisitions   0
Depreciation 0 0
Disposal of assets   0
Transfers   0
Change in foreign exchange rates 0  
Right-of-use assets, ending balance 2 1
Equipment    
Right-Of-Use Assets [Roll Forward]    
Right-of-use assets, beginning balance 6 16
Additions 3 0
Acquisitions   0
Depreciation (2) (2)
Disposal of assets   0
Transfers   (8)
Change in foreign exchange rates 0  
Right-of-use assets, ending balance 7 6
Pipeline    
Right-Of-Use Assets [Roll Forward]    
Right-of-use assets, beginning balance 0 42
Additions 0 0
Acquisitions   0
Depreciation 0 (1)
Disposal of assets   (41)
Transfers   0
Change in foreign exchange rates 0  
Right-of-use assets, ending balance $ 0 $ 0