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Property, Plant and Equipment - Detailed information about property, plant and equipment (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance $ (64,559)    
Ending balance (68,043) $ (64,559)  
Revaluation pre-tax gain   19  
Cost      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance (123,822) (119,749)  
Additions 5,393 3,961  
Acquisition of Devon assets 3,325    
Transfers from E&E assets 219 397  
Disposals/derecognitions (2,340) (1,394)  
Foreign exchange adjustments and other 630 (1,109)  
Ending balance (129,789) (123,822) $ (119,749)
Accumulated depletion and depreciation      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance 59,263 54,579  
Disposals/derecognitions 2,340 1,375  
Foreign exchange adjustments and other (464) 898  
Expense 5,287 5,161  
Ending balance 61,746 59,263 54,579
North Sea      
Reconciliation of changes in property, plant and equipment [abstract]      
Additions   108  
Revaluation pre-tax gain   19  
Midstream and Refining      
Reconciliation of changes in property, plant and equipment [abstract]      
Revaluation pre-tax gain     114
Operating segments | North America      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance (23,126)    
Ending balance (26,050) (23,126)  
Operating segments | North America | Cost      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance (67,007) (64,816)  
Additions 2,613 2,428  
Acquisition of Devon assets 3,325    
Transfers from E&E assets 219 175  
Disposals/derecognitions (537) (412)  
Foreign exchange adjustments and other 0 0  
Ending balance (72,627) (67,007) (64,816)
Operating segments | North America | Accumulated depletion and depreciation      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance 43,881 41,151  
Disposals/derecognitions 537 393  
Foreign exchange adjustments and other 18 12  
Expense 3,215 3,111  
Ending balance 46,577 43,881 41,151
Operating segments | North Sea      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance (1,586)    
Ending balance (1,584) (1,586)  
Operating segments | North Sea | Cost      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance (7,321) (7,126)  
Additions 349 237  
Acquisition of Devon assets 0    
Transfers from E&E assets 0 0  
Disposals/derecognitions 0 (703)  
Foreign exchange adjustments and other 374 (661)  
Ending balance (7,296) (7,321) (7,126)
Operating segments | North Sea | Accumulated depletion and depreciation      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance 5,735 5,653  
Disposals/derecognitions 0 703  
Foreign exchange adjustments and other (279) 528  
Expense 256 257  
Ending balance 5,712 5,735 5,653
Operating segments | Offshore Africa      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance (1,268)    
Ending balance (1,221) (1,268)  
Operating segments | Offshore Africa | Cost      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance (5,471) (4,881)  
Additions 233 212  
Acquisition of Devon assets 0    
Transfers from E&E assets 0 0  
Disposals/derecognitions (1,515) (70)  
Foreign exchange adjustments and other 256 (448)  
Ending balance (3,933) (5,471) (4,881)
Operating segments | Offshore Africa | Accumulated depletion and depreciation      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance 4,203 3,719  
Disposals/derecognitions 1,515 70  
Foreign exchange adjustments and other (190) 353  
Expense 214 201  
Ending balance 2,712 4,203 3,719
Operating segments | Oil Sands Mining and Upgrading      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance (38,166)    
Ending balance (38,769) (38,166)  
Operating segments | Oil Sands Mining and Upgrading | Cost      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance (43,147) (42,084)  
Additions 2,154 1,050  
Acquisition of Devon assets 0    
Transfers from E&E assets 0 222  
Disposals/derecognitions (285) (209)  
Foreign exchange adjustments and other 0 0  
Ending balance (45,016) (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 4,981 3,628  
Disposals/derecognitions 285 209  
Foreign exchange adjustments and other (13) 5  
Expense 1,564 1,557  
Ending balance 6,247 4,981 3,628
Operating segments | Midstream and Refining      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance (303)    
Ending balance (298) (303)  
Operating segments | Midstream and Refining | Cost      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance (441) (428)  
Additions 10 13  
Acquisition of Devon assets 0    
Transfers from E&E assets 0 0  
Disposals/derecognitions 0 0  
Foreign exchange adjustments and other 0 0  
Ending balance (451) (441) (428)
Operating segments | Midstream and Refining | Accumulated depletion and depreciation      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance 138 124  
Disposals/derecognitions 0 0  
Foreign exchange adjustments and other 0 0  
Expense 15 14  
Ending balance 153 138 124
Head office      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance (110)    
Ending balance (121) (110)  
Head office | Cost      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance (435) (414)  
Additions 34 21  
Acquisition of Devon assets 0    
Transfers from E&E assets 0 0  
Disposals/derecognitions (3) 0  
Foreign exchange adjustments and other 0 0  
Ending balance (466) (435) (414)
Head office | Accumulated depletion and depreciation      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance 325 304  
Disposals/derecognitions 3 0  
Foreign exchange adjustments and other 0 0  
Expense 23 21  
Ending balance 345 $ 325 $ 304
GABON | Operating segments | Offshore Africa      
Reconciliation of changes in property, plant and equipment [abstract]      
Disposals/derecognitions $ 1,515