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Segmented Information - Segmented Assets (Details) - CAD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Disclosure of operating segments [line items]    
Assets $ 76,665 $ 75,276
Head office    
Disclosure of operating segments [line items]    
Assets 185 202
North America | Operating segments    
Disclosure of operating segments [line items]    
Assets 30,645 29,094
North Sea | Operating segments    
Disclosure of operating segments [line items]    
Assets 1,561 1,624
Offshore Africa | Operating segments    
Disclosure of operating segments [line items]    
Assets 1,332 1,407
Other | Operating segments    
Disclosure of operating segments [line items]    
Assets 40 81
Oil Sands Mining and Upgrading | Operating segments    
Disclosure of operating segments [line items]    
Assets 42,016 41,567
Midstream and Refining | Operating segments    
Disclosure of operating segments [line items]    
Assets $ 886 $ 1,301