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Right of Use Assets - Narrative (Details)
$ in Millions
 1 Months Ended 12 Months Ended
Nov. 30, 2019
contractRenewal
Dec. 31, 2020
CAD ($)
Dec. 31, 2019
CAD ($)
Dec. 31, 2018
CAD ($)
Disclosure of quantitative information about right-of-use assets [line items]        
Contract for transporting natural gas, initial term 15 years      
Number of contract renewals | contractRenewal 8      
Renewal period 24 months      
Right-of-use assets   $ 141 $ 146 $ 52
Payments of lease liabilities, classified as financing activities   33 25  
Interest expense on lease liabilities   8 4 3
Repayments of principal on lease liabilities   25 21  
Expense relating to short-term leases for which recognition exemption has been used   0 2  
Expense relating to leases of low-value assets for which recognition exemption has been used   0 1  
Expense relating to variable lease payments not included in measurement of lease liabilities   $ 7 6  
Pioneer Pipeline | Alberta Thermal        
Disclosure of quantitative information about right-of-use assets [line items]        
Proportion of ownership interest in joint operation   50.00%    
IFRS 16        
Disclosure of quantitative information about right-of-use assets [line items]        
Right-of-use assets       $ 85
IFRS 16 | Wind Farms        
Disclosure of quantitative information about right-of-use assets [line items]        
Right-of-use assets     31  
Lease liabilities     $ 31