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PROPERTY, PLANT AND EQUIPMENT - Detailed information about property, plant and equipment (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance $ (65,170)  
Ending balance (64,559) $ (65,170)
Revaluation pre-tax gain 19 114
Project costs not subject to depletion and depreciation 1,424 944
Cost    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance (119,749) (101,826)
Additions 3,961 5,232
Acquisition of AOSP and other assets (note 7)   14,181
Transfers from E&E assets 397 198
Disposals/derecognitions (1,394) (827)
Foreign exchange adjustments and other (1,109) 861
Ending balance (123,822) (119,749)
Accumulated depletion and depreciation    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 54,579 50,916
Disposals/derecognitions 1,375 827
Foreign exchange adjustments and other 898 (696)
Expense 5,161 5,186
Ending balance 59,263 54,579
North Sea    
Reconciliation of changes in property, plant and equipment [abstract]    
Additions 108  
Revaluation pre-tax gain 19  
Midstream    
Reconciliation of changes in property, plant and equipment [abstract]    
Revaluation pre-tax gain 114 114
Operating segments | North America    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance (23,665)  
Ending balance (23,126) (23,665)
Operating segments | North America | Cost    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance (64,816) (61,647)
Additions 2,428 3,003
Acquisition of AOSP and other assets (note 7)   349
Transfers from E&E assets 175 198
Disposals/derecognitions (412) (381)
Foreign exchange adjustments and other 0 0
Ending balance (67,007) (64,816)
Operating segments | North America | Accumulated depletion and depreciation    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 41,151 38,311
Disposals/derecognitions 393 381
Foreign exchange adjustments and other 12 1
Expense 3,111 3,220
Ending balance 43,881 41,151
Operating segments | North Sea    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance (1,473)  
Ending balance (1,586) (1,473)
Operating segments | North Sea | Cost    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance (7,126) (7,380)
Additions 237 255
Acquisition of AOSP and other assets (note 7)   0
Transfers from E&E assets 0 0
Disposals/derecognitions (703) 0
Foreign exchange adjustments and other (661) 509
Ending balance (7,321) (7,126)
Operating segments | North Sea | Accumulated depletion and depreciation    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 5,653 5,584
Disposals/derecognitions 703 0
Foreign exchange adjustments and other 528 (440)
Expense 257 509
Ending balance 5,735 5,653
Operating segments | Offshore Africa    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance (1,162)  
Ending balance (1,268) (1,162)
Operating segments | Offshore Africa | Cost    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance (4,881) (5,132)
Additions 212 101
Acquisition of AOSP and other assets (note 7)   0
Transfers from E&E assets 0 0
Disposals/derecognitions (70) 0
Foreign exchange adjustments and other (448) 352
Ending balance (5,471) (4,881)
Operating segments | Offshore Africa | Accumulated depletion and depreciation    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 3,719 3,797
Disposals/derecognitions 70 0
Foreign exchange adjustments and other 353 (283)
Expense 201 205
Ending balance 4,203 3,719
Operating segments | Oil Sands Mining and Upgrading    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance (38,456)  
Ending balance (38,166) (38,456)
Operating segments | Oil Sands Mining and Upgrading | Cost    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance (42,084) (27,038)
Additions 1,050 1,660
Acquisition of AOSP and other assets (note 7)   13,832
Transfers from E&E assets 222 0
Disposals/derecognitions (209) (446)
Foreign exchange adjustments and other 0 0
Ending balance (43,147) (42,084)
Operating segments | Oil Sands Mining and Upgrading | Accumulated depletion and depreciation    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 3,628 2,828
Disposals/derecognitions 209 446
Foreign exchange adjustments and other 5 26
Expense 1,557 1,220
Ending balance 4,981 3,628
Operating segments | Midstream    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance (304)  
Ending balance (303) (304)
Operating segments | Midstream | Cost    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance (428) (234)
Additions 13 194
Acquisition of AOSP and other assets (note 7)   0
Transfers from E&E assets 0 0
Disposals/derecognitions 0 0
Foreign exchange adjustments and other 0 0
Ending balance (441) (428)
Operating segments | Midstream | Accumulated depletion and depreciation    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 124 115
Disposals/derecognitions 0 0
Foreign exchange adjustments and other 0 0
Expense 14 9
Ending balance 138 124
Head office    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance (110)  
Ending balance (110) (110)
Head office | Cost    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance (414) (395)
Additions 21 19
Acquisition of AOSP and other assets (note 7)   0
Transfers from E&E assets 0 0
Disposals/derecognitions 0 0
Foreign exchange adjustments and other 0 0
Ending balance (435) (414)
Head office | Accumulated depletion and depreciation    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 304 281
Disposals/derecognitions 0 0
Foreign exchange adjustments and other 0 0
Expense 21 23
Ending balance $ 325 $ 304