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Segmented Information - Segmented Assets (Details) - CAD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure of operating segments [line items]    
Assets $ 75,276 $ 78,121
Head office    
Disclosure of operating segments [line items]    
Assets 202 227
North America | Operating segments    
Disclosure of operating segments [line items]    
Assets 29,094 30,963
North Sea | Operating segments    
Disclosure of operating segments [line items]    
Assets 1,624 1,948
Offshore Africa | Operating segments    
Disclosure of operating segments [line items]    
Assets 1,407 1,529
Other | Operating segments    
Disclosure of operating segments [line items]    
Assets 81 30
Oil Sands Mining and Upgrading | Operating segments    
Disclosure of operating segments [line items]    
Assets 41,567 42,006
Midstream and Refining | Operating segments    
Disclosure of operating segments [line items]    
Assets $ 1,301 $ 1,418