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Other Long-Term Assets - Narrative (Details)
 12 Months Ended
Dec. 31, 2019
CAD ($)
bbl
Dec. 31, 2018
CAD ($)
Dec. 31, 2017
CAD ($)
Dec. 31, 2013
Jun. 01, 2018
Disclosure of joint ventures [line items]          
North West Redwater Partnership subordinated debt $ 652,000,000 $ 591,000,000      
Prepaid cost of service toll 130,000,000 62,000,000      
Borrowings 20,982,000,000 20,623,000,000      
Net earnings 5,416,000,000 2,591,000,000 $ 2,397,000,000    
Non-revolving term credit facility maturing February 2021          
Disclosure of joint ventures [line items]          
Maximum credit facility $ 750,000,000        
North West Redwater Partnership          
Disclosure of joint ventures [line items]          
Company's voting percent interest in joint venture 50.00%        
Processing agreement, barrels of bitumen feedstock per day | bbl 50,000        
Processing agreement, barrels of bitumen feedstock per date for the Company | bbl 12,500        
Processing agreement, barrels of bitumen feedstock per date for others | bbl 37,500        
Company's ownership interest in joint venture 50.00%     50.00%  
Subordinated debt interest rate variable       6.00%  
Debt to equity ratio       400.00%  
Subordinated debt contributed before accrued interest $ 439,000,000        
Accrued interest 213,000,000        
North West Redwater Partnership subordinated debt $ 652,000,000        
Percent of pro rata share of debt company has committed paying to joint venture 25.00%       25.00%
Term of commitment to joint venture 30 years        
Net earnings $ (346,000,000) (5,000,000)      
Recognized share of losses of joint ventures 287,000,000        
Investments in joint ventures 0        
Unrecognised share of losses of joint ventures $ 59,000,000 0      
North West Redwater Partnership          
Disclosure of joint ventures [line items]          
Processing agreement, barrels of bitumen feedstock per day | bbl 50,000        
Processing agreement term 30 years        
Facility capital cost budget for the Project $ 10,000,000,000        
Net earnings (692,000,000) $ (10,000,000)      
North West Redwater Partnership | Syndicated credit facility          
Disclosure of joint ventures [line items]          
Maximum credit facility 3,500,000,000        
Borrowings 2,715,000,000        
North West Redwater Partnership | Non-revolving term credit facility maturing February 2021          
Disclosure of joint ventures [line items]          
Maximum credit facility 1,500,000,000        
Major Borrowings Transactions | North West Redwater Partnership | Syndicated credit facility          
Disclosure of joint ventures [line items]          
Maximum credit facility $ 2,000,000,000