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Accounting Policies - Narrative (Details)
 12 Months Ended
Dec. 31, 2023
Performance Share Units  
Disclosure of detailed information about property, plant and equipment [line items]  
Vesting term (in years) 3 years
Bottom of range | Midstream and Refining  
Disclosure of detailed information about property, plant and equipment [line items]  
Estimated useful life (in years) 5 years
Top of range | Midstream and Refining  
Disclosure of detailed information about property, plant and equipment [line items]  
Estimated useful life (in years) 30 years
Other equipment | Bottom of range | Oil Sands Mining and Upgrading  
Disclosure of detailed information about property, plant and equipment [line items]  
Estimated useful life (in years) 2 years
Other equipment | Top of range | Oil Sands Mining and Upgrading  
Disclosure of detailed information about property, plant and equipment [line items]  
Estimated useful life (in years) 20 years