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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Right-Of-Use Assets [Roll Forward]      
Right-of-use assets, beginning balance $ 146 $ 52  
Transfers to right-of-use assets   (1)  
Additions to right-of-use assets 16 81  
Depreciation, right-of-use assets (21) (18)  
Changes in foreign exchange rates   (1)  
Right-of-use assets, ending balance 141 146 $ 52
Land      
Right-Of-Use Assets [Roll Forward]      
Right-of-use assets, beginning balance 58 29  
Transfers to right-of-use assets   0  
Additions to right-of-use assets 3 32  
Depreciation, right-of-use assets (3) (1)  
Changes in foreign exchange rates   (1)  
Right-of-use assets, ending balance 58 58 29
Buildings      
Right-Of-Use Assets [Roll Forward]      
Right-of-use assets, beginning balance 16 22  
Transfers to right-of-use assets   0  
Additions to right-of-use assets 13 2  
Depreciation, right-of-use assets (5) (4)  
Changes in foreign exchange rates   0  
Right-of-use assets, ending balance 24 16 22
Vehicles      
Right-Of-Use Assets [Roll Forward]      
Right-of-use assets, beginning balance 2 1  
Transfers to right-of-use assets   0  
Additions to right-of-use assets 0 0  
Depreciation, right-of-use assets (1) (2)  
Changes in foreign exchange rates   0  
Right-of-use assets, ending balance 1 2 1
Equipment      
Right-Of-Use Assets [Roll Forward]      
Right-of-use assets, beginning balance 25 0  
Transfers to right-of-use assets   (1)  
Additions to right-of-use assets 0 2  
Depreciation, right-of-use assets (9) (11)  
Changes in foreign exchange rates   0  
Right-of-use assets, ending balance 16 25 0
Pipeline      
Right-Of-Use Assets [Roll Forward]      
Right-of-use assets, beginning balance 45 0  
Transfers to right-of-use assets   0  
Additions to right-of-use assets 0 45  
Depreciation, right-of-use assets (3) 0  
Changes in foreign exchange rates   0  
Right-of-use assets, ending balance $ 42 45 0
IFRS 16      
Right-Of-Use Assets [Roll Forward]      
Right-of-use assets, beginning balance   85  
Adjustments on recognition     (5)
Transfers to right-of-use assets     (38)
Right-of-use assets, ending balance     85
IFRS 16 | Land      
Right-Of-Use Assets [Roll Forward]      
Right-of-use assets, beginning balance   28  
Adjustments on recognition     (1)
Transfers to right-of-use assets     0
Right-of-use assets, ending balance     28
IFRS 16 | Buildings      
Right-Of-Use Assets [Roll Forward]      
Right-of-use assets, beginning balance   18  
Adjustments on recognition     (4)
Transfers to right-of-use assets     0
Right-of-use assets, ending balance     18
IFRS 16 | Vehicles      
Right-Of-Use Assets [Roll Forward]      
Right-of-use assets, beginning balance   4  
Adjustments on recognition     0
Transfers to right-of-use assets     (3)
Right-of-use assets, ending balance     4
IFRS 16 | Equipment      
Right-Of-Use Assets [Roll Forward]      
Right-of-use assets, beginning balance   35  
Adjustments on recognition     0
Transfers to right-of-use assets     (35)
Right-of-use assets, ending balance     35
IFRS 16 | Pipeline      
Right-Of-Use Assets [Roll Forward]      
Right-of-use assets, beginning balance   $ 0  
Adjustments on recognition     0
Transfers to right-of-use assets     0
Right-of-use assets, ending balance     $ 0