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PROPERTY, PLANT AND EQUIPMENT - Detailed information about property, plant and equipment (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning Balance $ 50,910  
Ending Balance 65,170 $ 50,910
Project costs not subject to depletion and depreciation 944 846
Cost    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning Balance 101,826 98,425
Additions 5,232 4,609
Transfers from E&E assets 198 211
Disposals/derecognitions (827) (1,042)
Foreign exchange adjustments and other (861) (377)
Ending Balance 119,749 101,826
Accumulated depletion and depreciation    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning Balance (50,916) (46,950)
Expense (5,186) (4,840)
Disposals/derecognitions 827 641
Foreign exchange adjustments and other 696 233
Ending Balance (54,579) (50,916)
Operating segments | North America    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning Balance 23,336  
Ending Balance 23,665 23,336
Operating segments | North America | Cost    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning Balance 61,647 60,540
Additions 3,003 1,462
Transfers from E&E assets 198 211
Disposals/derecognitions (381) (566)
Foreign exchange adjustments and other 0 0
Ending Balance 64,816 61,647
Operating segments | North America | Accumulated depletion and depreciation    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning Balance (38,311) (35,347)
Expense (3,220) (3,440)
Disposals/derecognitions 381 486
Foreign exchange adjustments and other (1) (10)
Ending Balance (41,151) (38,311)
Operating segments | North Sea    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning Balance 1,796  
Ending Balance 1,473 1,796
Operating segments | North Sea | Cost    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning Balance 7,380 7,414
Additions 255 186
Transfers from E&E assets 0 0
Disposals/derecognitions 0 0
Foreign exchange adjustments and other (509) (220)
Ending Balance 7,126 7,380
Operating segments | North Sea | Accumulated depletion and depreciation    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning Balance (5,584) (5,264)
Expense (509) (457)
Disposals/derecognitions 0 0
Foreign exchange adjustments and other 440 137
Ending Balance (5,653) (5,584)
Operating segments | Offshore Africa    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning Balance 1,335  
Ending Balance 1,162 1,335
Operating segments | Offshore Africa | Cost    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning Balance 5,132 5,173
Additions 101 116
Transfers from E&E assets 0 0
Disposals/derecognitions 0 0
Foreign exchange adjustments and other (352) (157)
Ending Balance 4,881 5,132
Operating segments | Offshore Africa | Accumulated depletion and depreciation    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning Balance (3,797) (3,659)
Expense (205) (243)
Disposals/derecognitions 0 0
Foreign exchange adjustments and other 283 105
Ending Balance (3,719) (3,797)
Operating segments | Oil Sands Mining and Upgrading    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning Balance 24,210  
Ending Balance 38,456 24,210
Operating segments | Oil Sands Mining and Upgrading | Cost    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning Balance 27,038 24,343
Additions 1,660 2,822
Transfers from E&E assets 0 0
Disposals/derecognitions (446) (127)
Foreign exchange adjustments and other 0 0
Ending Balance 42,084 27,038
Operating segments | Oil Sands Mining and Upgrading | Accumulated depletion and depreciation    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning Balance (2,828) (2,294)
Expense (1,220) (662)
Disposals/derecognitions 446 127
Foreign exchange adjustments and other (26) 1
Ending Balance (3,628) (2,828)
Operating segments | Midstream    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning Balance 119  
Ending Balance 304 119
Operating segments | Midstream | Cost    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning Balance 234 577
Additions 194 6
Transfers from E&E assets 0 0
Disposals/derecognitions 0 (349)
Foreign exchange adjustments and other 0 0
Ending Balance 428 234
Operating segments | Midstream | Accumulated depletion and depreciation    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning Balance (115) (132)
Expense (9) (11)
Disposals/derecognitions 0 28
Foreign exchange adjustments and other 0 0
Ending Balance (124) (115)
Head office    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning Balance 114  
Ending Balance 110 114
Head office | Cost    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning Balance 395 378
Additions 19 17
Transfers from E&E assets 0 0
Disposals/derecognitions 0 0
Foreign exchange adjustments and other 0 0
Ending Balance 414 395
Head office | Accumulated depletion and depreciation    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning Balance (281) (254)
Expense (23) (27)
Disposals/derecognitions 0 0
Foreign exchange adjustments and other 0 0
Ending Balance (304) $ (281)
AOSP | Cost    
Reconciliation of changes in property, plant and equipment [abstract]    
Acquisition of AOSP and other assets (note 7) 14,181  
AOSP | Operating segments | North America | Cost    
Reconciliation of changes in property, plant and equipment [abstract]    
Acquisition of AOSP and other assets (note 7) 349  
AOSP | Operating segments | North Sea | Cost    
Reconciliation of changes in property, plant and equipment [abstract]    
Acquisition of AOSP and other assets (note 7) 0  
AOSP | Operating segments | Offshore Africa | Cost    
Reconciliation of changes in property, plant and equipment [abstract]    
Acquisition of AOSP and other assets (note 7) 0  
AOSP | Operating segments | Oil Sands Mining and Upgrading | Cost    
Reconciliation of changes in property, plant and equipment [abstract]    
Acquisition of AOSP and other assets (note 7) 13,832  
AOSP | Operating segments | Midstream | Cost    
Reconciliation of changes in property, plant and equipment [abstract]    
Acquisition of AOSP and other assets (note 7) 0  
AOSP | Head office | Cost    
Reconciliation of changes in property, plant and equipment [abstract]    
Acquisition of AOSP and other assets (note 7) $ 0