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Segmented Information - Segmented Assets (Details) - CAD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Disclosure of operating segments [line items]    
Assets $ 85,359 $ 75,955
Operating segments | North America    
Disclosure of operating segments [line items]    
Assets 32,670 30,058
Operating segments | North Sea    
Disclosure of operating segments [line items]    
Assets 702 602
Operating segments | Offshore Africa    
Disclosure of operating segments [line items]    
Assets 1,412 1,380
Operating segments | Other    
Disclosure of operating segments [line items]    
Assets 31 32
Operating segments | Oil Sands Mining and Upgrading    
Disclosure of operating segments [line items]    
Assets 49,221 42,865
Operating segments | Midstream and Refining    
Disclosure of operating segments [line items]    
Assets 1,099 856
Head Office    
Disclosure of operating segments [line items]    
Assets $ 224 $ 162