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Segmented Information - Segmented Assets (Details) - CAD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Disclosure of operating segments [line items]    
Assets $ 75,955 $ 76,142
Operating segments | North America    
Disclosure of operating segments [line items]    
Assets 30,058 31,135
Operating segments | North Sea    
Disclosure of operating segments [line items]    
Assets 602 378
Operating segments | Offshore Africa    
Disclosure of operating segments [line items]    
Assets 1,380 1,322
Operating segments | Other    
Disclosure of operating segments [line items]    
Assets 32 54
Operating segments | Oil Sands Mining and Upgrading    
Disclosure of operating segments [line items]    
Assets 42,865 42,102
Operating segments | Midstream and Refining    
Disclosure of operating segments [line items]    
Assets 856 979
Head Office    
Disclosure of operating segments [line items]    
Assets $ 162 $ 172