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Segmented Information - Segmented Assets (Details) - CAD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Disclosure of operating segments [line items]    
Assets $ 78,121 $ 71,559
Head office    
Disclosure of operating segments [line items]    
Assets 227 110
North America | Operating segments    
Disclosure of operating segments [line items]    
Assets 30,963 27,199
North Sea | Operating segments    
Disclosure of operating segments [line items]    
Assets 1,948 1,699
Offshore Africa | Operating segments    
Disclosure of operating segments [line items]    
Assets 1,529 1,471
Other | Operating segments    
Disclosure of operating segments [line items]    
Assets 30 33
Oil Sands Mining and Upgrading | Operating segments    
Disclosure of operating segments [line items]    
Assets 42,006 39,634
Midstream and Refining | Operating segments    
Disclosure of operating segments [line items]    
Assets $ 1,418 $ 1,413