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EXPLORATION AND EVALUATION ASSETS - Detailed information about exploration and evaluation assets (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Detailed Information About Exploration For And Evaluation Of Mineral Resources [Line Items]    
Beginning balance $ 2,632 $ 2,382
Additions 502 159
Acquisition of AOSP and other assets (note 7)   290
Transfers to property, plant and equipment (397) (198)
Disposals/derecognitions (100) (1)
Ending balance 2,637 2,632
North America    
Disclosure Of Detailed Information About Exploration For And Evaluation Of Mineral Resources [Line Items]    
Beginning balance 2,282 2,306
Additions 245 144
Acquisition of AOSP and other assets (note 7)   31
Transfers to property, plant and equipment (175) (198)
Disposals/derecognitions (4) (1)
Ending balance 2,348 2,282
North Sea    
Disclosure Of Detailed Information About Exploration For And Evaluation Of Mineral Resources [Line Items]    
Beginning balance 0 0
Additions 0 0
Acquisition of AOSP and other assets (note 7)   0
Transfers to property, plant and equipment 0 0
Disposals/derecognitions 0 0
Ending balance 0 0
Offshore Africa    
Disclosure Of Detailed Information About Exploration For And Evaluation Of Mineral Resources [Line Items]    
Beginning balance 91 76
Additions 35 15
Acquisition of AOSP and other assets (note 7)   0
Transfers to property, plant and equipment 0 0
Disposals/derecognitions (89) 0
Ending balance 37 91
Oil Sands Mining and Upgrading    
Disclosure Of Detailed Information About Exploration For And Evaluation Of Mineral Resources [Line Items]    
Beginning balance 259 0
Additions 222 0
Acquisition of AOSP and other assets (note 7)   259
Transfers to property, plant and equipment (222) 0
Disposals/derecognitions (7) 0
Ending balance $ 252 $ 259