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Short-Term Borrowings - Additional Information (Details)
Dec. 31, 2020
CAD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
CAD ($)
Disclosure of detailed information about borrowings [line items]      
Uncommitted demand facilities $ 1,100,000,000    
Amount of drawn facility 0    
Outstanding letters of credit 441,000,000   $ 364,000,000
Cenovus Energy Inc. [Member]      
Disclosure of detailed information about borrowings [line items]      
Amount of drawn facility 121,000,000 $ 95,000,000  
WRB [Member]      
Disclosure of detailed information about borrowings [line items]      
Uncommitted demand facilities   55,000,000  
Amount of drawn facility   190,000,000  
Top of Range [Member]      
Disclosure of detailed information about borrowings [line items]      
Uncommitted demand facilities 1,600,000,000    
Amount of undrawn facilities for general purposes $ 600,000,000    
Top of Range [Member] | WRB [Member]      
Disclosure of detailed information about borrowings [line items]      
Borrowing facilities   300,000,000  
Top of Range [Member] | WRB [Member] | Cenovus Energy Inc. [Member]      
Disclosure of detailed information about borrowings [line items]      
Borrowing facilities   $ 150,000,000