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Other Long-Term Assets - Narrative (Details)
 12 Months Ended
Dec. 31, 2024
CAD ($)
bbl
Dec. 31, 2023
CAD ($)
Dec. 31, 2022
CAD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Disclosure of joint ventures [line items]          
Borrowings, interest rate 3.80%     3.80%  
Borrowings $ 18,819,000,000 $ 10,799,000,000      
Commercial Paper          
Disclosure of joint ventures [line items]          
Maximum credit facility       $ 2,500,000,000  
Borrowings $ 672,000,000     $ 467,000,000 $ 0
North West Redwater Partnership          
Disclosure of joint ventures [line items]          
Toll payer percent for others 75.00%        
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 date for the Company | bbl 12,500        
Percent of pro rata share of debt company has committed paying to joint venture, toll payer percent 25.00%        
Processing agreement, barrels of bitumen feedstock per date for others | bbl 37,500        
Term of commitment to joint venture 40 years        
Investments in joint ventures $ 0        
Cumulative unrecognised share of losses of joint ventures 509,000,000 555,000,000      
Recovery of unrecognised share of losses of joint ventures $ 46,000,000   $ 11,000,000    
Unrecognised share of losses of joint ventures   4,000,000      
North West Redwater Partnership | North West Redwater Partnership          
Disclosure of joint ventures [line items]          
Barrels of bitumen feedstock processed per day | bbl 50,000        
Maximum credit facility $ 2,150,000,000 3,115,000,000      
Borrowings 8,750,000,000 7,950,000,000      
North West Redwater Partnership | North West Redwater Partnership | Series A Bonds          
Disclosure of joint ventures [line items]          
Repayments of credit facility $ 500,000,000        
Borrowings, interest rate 3.20%     3.20%  
North West Redwater Partnership | North West Redwater Partnership | Series P Bonds Due June 2034          
Disclosure of joint ventures [line items]          
Borrowings, interest rate 4.85%     4.85%  
Maximum credit facility $ 700,000,000        
North West Redwater Partnership | North West Redwater Partnership | Series Q Bonds Due June 2054          
Disclosure of joint ventures [line items]          
Borrowings, interest rate 5.08%     5.08%  
Maximum credit facility $ 600,000,000        
North West Redwater Partnership | North West Redwater Partnership | Commercial Paper          
Disclosure of joint ventures [line items]          
Unsecured revolving credit facility 2,000,000,000        
Borrowings 1,459,000,000 0      
North West Redwater Partnership | North West Redwater Partnership | Revolving Credit Facility          
Disclosure of joint ventures [line items]          
Maximum credit facility 1,900,000,000 2,175,000,000      
North West Redwater Partnership | North West Redwater Partnership | Non-Revolving Credit Facility          
Disclosure of joint ventures [line items]          
Maximum credit facility 250,000,000 940,000,000      
North West Redwater Partnership | North West Redwater Partnership | Syndicated Credit Facility          
Disclosure of joint ventures [line items]          
Maximum credit facility 1,900,000,000        
Reduction in maximum borrowing capacity 275,000,000        
Borrowings 251,000,000 2,559,000,000      
North West Redwater Partnership | North West Redwater Partnership | Syndicated Credit Facility, Non-Revolving          
Disclosure of joint ventures [line items]          
Maximum credit facility 250,000,000        
Repayments of line of credit facility 657,000,000        
North West Redwater Partnership | North West Redwater Partnership | Short term demand operating facility          
Disclosure of joint ventures [line items]          
Maximum credit facility 300,000,000 300,000,000      
Borrowings 103,000,000 77,000,000      
North West Redwater Partnership | North West Redwater Partnership | Bilateral Facilities          
Disclosure of joint ventures [line items]          
Maximum credit facility $ 300,000,000 $ 150,000,000