XML 84 R54.htm IDEA: XBRL DOCUMENT v3.8.0.1
EXPLORATION AND EVALUATION ASSETS - Detailed information about exploration and evaluation assets (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure Of Detailed Information About Exploration For And Evaluation Of Mineral Resources [Line Items]    
Beginning balance $ 2,382 $ 2,586
Additions 159 29
Acquisition of AOSP and other assets (note 7) 290  
Transfers to property, plant and equipment (198) (211)
Disposals/derecognitions (1) (21)
Foreign exchange adjustments   (1)
Ending balance 2,632 2,382
North America    
Disclosure Of Detailed Information About Exploration For And Evaluation Of Mineral Resources [Line Items]    
Beginning balance 2,306 2,500
Additions 144 20
Acquisition of AOSP and other assets (note 7) 31  
Transfers to property, plant and equipment (198) (211)
Disposals/derecognitions (1) (3)
Foreign exchange adjustments   0
Ending balance 2,282 2,306
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
Foreign exchange adjustments   0
Ending balance 0 0
Offshore Africa    
Disclosure Of Detailed Information About Exploration For And Evaluation Of Mineral Resources [Line Items]    
Beginning balance 76 86
Additions 15 9
Acquisition of AOSP and other assets (note 7) 0  
Transfers to property, plant and equipment 0 0
Disposals/derecognitions 0 (18)
Foreign exchange adjustments   (1)
Ending balance 91 76
Oil Sands Mining and Upgrading    
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) 259  
Transfers to property, plant and equipment 0 0
Disposals/derecognitions 0 0
Foreign exchange adjustments   0
Ending balance $ 259 $ 0