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Property, Plant and Equipment - Detailed information about property, plant and equipment (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance $ (68,043)    
Ending balance (65,752) $ (68,043)  
Cost      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance (129,789) (123,822)  
Additions 3,340 5,393  
Acquisition of Devon assets   3,325  
Transfers from E&E assets 194 219  
Derecognitions 1,158 2,340  
Disposals (92)    
Foreign exchange adjustments and other 178 630  
Ending balance (131,895) (129,789) $ (123,822)
Accumulated depletion and depreciation      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance 61,746 59,263  
Derecognitions (1,158) (2,340)  
Disposals 63    
Foreign exchange adjustments and other (174) (464)  
Expense 5,792 5,287  
Ending balance 66,143 61,746 59,263
North Sea      
Reconciliation of changes in property, plant and equipment [abstract]      
Additions     108
Operating segments | North America      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance (26,050)    
Ending balance (24,356) (26,050)  
Operating segments | North America | Cost      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance (72,627) (67,007)  
Additions 1,789 2,613  
Acquisition of Devon assets   3,325  
Transfers from E&E assets 194 219  
Derecognitions 521 537  
Disposals (92)    
Foreign exchange adjustments and other 0 0  
Ending balance (73,997) (72,627) (67,007)
Operating segments | North America | Accumulated depletion and depreciation      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance 46,577 43,881  
Derecognitions (521) (537)  
Disposals 63    
Foreign exchange adjustments and other (28) 18  
Expense 3,676 3,215  
Ending balance 49,641 46,577 43,881
Operating segments | North Sea      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance (1,584)    
Ending balance (1,430) (1,584)  
Operating segments | North Sea | Cost      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance (7,296) (7,321)  
Additions 104 349  
Acquisition of Devon assets   0  
Transfers from E&E assets 0 0  
Derecognitions 3 0  
Disposals 0    
Foreign exchange adjustments and other 114 374  
Ending balance (7,283) (7,296) (7,321)
Operating segments | North Sea | Accumulated depletion and depreciation      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance 5,712 5,735  
Derecognitions (3) 0  
Disposals 0    
Foreign exchange adjustments and other (103) (279)  
Expense 247 256  
Ending balance 5,853 5,712 5,735
Operating segments | Offshore Africa      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance (1,221)    
Ending balance (1,141) (1,221)  
Operating segments | Offshore Africa | Cost      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance (3,933) (5,471)  
Additions 94 233  
Acquisition of Devon assets   0  
Transfers from E&E assets 0 0  
Derecognitions 0 1,515  
Disposals 0    
Foreign exchange adjustments and other 64 256  
Ending balance (3,963) (3,933) (5,471)
Operating segments | Offshore Africa | Accumulated depletion and depreciation      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance 2,712 4,203  
Derecognitions 0 (1,515)  
Disposals 0    
Foreign exchange adjustments and other (51) (190)  
Expense 161 214  
Ending balance 2,822 2,712 4,203
Operating segments | Oil Sands Mining and Upgrading      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance (38,769)    
Ending balance (38,421) (38,769)  
Operating segments | Oil Sands Mining and Upgrading | Cost      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance (45,016) (43,147)  
Additions 1,328 2,154  
Acquisition of Devon assets   0  
Transfers from E&E assets 0 0  
Derecognitions 634 285  
Disposals 0    
Foreign exchange adjustments and other 0 0  
Ending balance (45,710) (45,016) (43,147)
Operating segments | Oil Sands Mining and Upgrading | Accumulated depletion and depreciation      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance 6,247 4,981  
Derecognitions (634) (285)  
Disposals 0    
Foreign exchange adjustments and other 8 (13)  
Expense 1,668 1,564  
Ending balance 7,289 6,247 4,981
Operating segments | Midstream and Refining      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance (298)    
Ending balance (289) (298)  
Operating segments | Midstream and Refining | Cost      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance (451) (441)  
Additions 6 10  
Acquisition of Devon assets   0  
Transfers from E&E assets 0 0  
Derecognitions 0 0  
Disposals 0    
Foreign exchange adjustments and other 0 0  
Ending balance (457) (451) (441)
Operating segments | Midstream and Refining | Accumulated depletion and depreciation      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance 153 138  
Derecognitions 0 0  
Disposals 0    
Foreign exchange adjustments and other 0 0  
Expense 15 15  
Ending balance 168 153 138
Head office      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance (121)    
Ending balance (115) (121)  
Head office | Cost      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance (466) (435)  
Additions 19 34  
Acquisition of Devon assets   0  
Transfers from E&E assets 0 0  
Derecognitions 0 3  
Disposals 0    
Foreign exchange adjustments and other 0 0  
Ending balance (485) (466) (435)
Head office | Accumulated depletion and depreciation      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance 345 325  
Derecognitions 0 (3)  
Disposals 0    
Foreign exchange adjustments and other 0 0  
Expense 25 23  
Ending balance $ 370 345 $ 325
GABON | Operating segments | Offshore Africa      
Reconciliation of changes in property, plant and equipment [abstract]      
Disposals   $ (1,515)