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Segmented Information - Segmented Assets (Details) - CAD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Disclosure of operating segments [line items]    
Assets $ 76,142 $ 76,665
Operating segments | North America    
Disclosure of operating segments [line items]    
Assets 31,135 30,645
Operating segments | North Sea    
Disclosure of operating segments [line items]    
Assets 378 1,561
Operating segments | Offshore Africa    
Disclosure of operating segments [line items]    
Assets 1,322 1,332
Operating segments | Other    
Disclosure of operating segments [line items]    
Assets 54 40
Operating segments | Oil Sands Mining and Upgrading    
Disclosure of operating segments [line items]    
Assets 42,102 42,016
Operating segments | Midstream and Refining    
Disclosure of operating segments [line items]    
Assets 979 886
Head Office    
Disclosure of operating segments [line items]    
Assets $ 172 $ 185