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SEGMENTED INFORMATION - Segmented Assets (Details) - CAD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Disclosure of operating segments [line items]    
Assets $ 73,867 $ 58,648
Non-segmented    
Disclosure of operating segments [line items]    
Assets 110 114
North America | Operating segments    
Disclosure of operating segments [line items]    
Assets 28,705 28,892
North Sea | Operating segments    
Disclosure of operating segments [line items]    
Assets 1,854 2,269
Offshore Africa | Operating segments    
Disclosure of operating segments [line items]    
Assets 1,331 1,580
Other | Operating segments    
Disclosure of operating segments [line items]    
Assets 29 29
Oil Sands Mining and Upgrading | Operating segments    
Disclosure of operating segments [line items]    
Assets 40,559 24,852
Midstream | Operating segments    
Disclosure of operating segments [line items]    
Assets $ 1,279 $ 912