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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2019
Disclosure of quantitative information about right-of-use assets [line items]        
Right-of-use assets $ 146 $ 0    
Property, plant and equipment 6,207 6,164 $ 6,578  
Change in foreign exchange rates 0 5 (7)  
Land        
Disclosure of quantitative information about right-of-use assets [line items]        
Property, plant and equipment 91 94 $ 95  
IFRS 16        
Disclosure of quantitative information about right-of-use assets [line items]        
Right-of-use assets 146 52   $ 85
Right-of-use assets, increase (decrease) in revaluation surplus   (5)    
Property, plant and equipment   38    
Additions to right-of-use assets 81      
Depreciation, right-of-use assets (18)      
Change in foreign exchange rates (1)      
Right-Of-Use Assets, Transfer (1)      
IFRS 16 | Land        
Disclosure of quantitative information about right-of-use assets [line items]        
Right-of-use assets 58 29   28
Right-of-use assets, increase (decrease) in revaluation surplus   (1)    
Property, plant and equipment   0    
Additions to right-of-use assets 32      
Depreciation, right-of-use assets (1)      
Change in foreign exchange rates (1)      
Right-Of-Use Assets, Transfer 0      
IFRS 16 | Buildings        
Disclosure of quantitative information about right-of-use assets [line items]        
Right-of-use assets 16 22   18
Right-of-use assets, increase (decrease) in revaluation surplus   (4)    
Property, plant and equipment   0    
Additions to right-of-use assets 2      
Depreciation, right-of-use assets (4)      
Change in foreign exchange rates 0      
Right-Of-Use Assets, Transfer 0      
IFRS 16 | Vehicles        
Disclosure of quantitative information about right-of-use assets [line items]        
Right-of-use assets 2 1   4
Right-of-use assets, increase (decrease) in revaluation surplus   0    
Property, plant and equipment   3    
Additions to right-of-use assets 0      
Depreciation, right-of-use assets (2)      
Change in foreign exchange rates 0      
Right-Of-Use Assets, Transfer 0      
IFRS 16 | Equipment        
Disclosure of quantitative information about right-of-use assets [line items]        
Right-of-use assets 25 0   35
Right-of-use assets, increase (decrease) in revaluation surplus   0    
Property, plant and equipment   35    
Additions to right-of-use assets 2      
Depreciation, right-of-use assets (11)      
Change in foreign exchange rates 0      
Right-Of-Use Assets, Transfer (1)      
IFRS 16 | Pipeline        
Disclosure of quantitative information about right-of-use assets [line items]        
Right-of-use assets 45 0   $ 0
Right-of-use assets, increase (decrease) in revaluation surplus   0    
Property, plant and equipment   $ 0    
Additions to right-of-use assets 45      
Depreciation, right-of-use assets 0      
Change in foreign exchange rates 0      
Right-Of-Use Assets, Transfer $ 0