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Property, Plant and Equipment - Detailed information about property, plant and equipment (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of period $ 66,400  
Property, plant and equipment at end of period 64,859 $ 66,400
Operating segments | North America    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of period 25,102  
Property, plant and equipment at end of period 25,240 25,102
Operating segments | North Sea    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of period 1,487  
Property, plant and equipment at end of period 152 1,487
Operating segments | Offshore Africa    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of period 1,057  
Property, plant and equipment at end of period 1,055 1,057
Operating segments | Oil Sands Mining and Upgrading    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of period 38,357  
Property, plant and equipment at end of period 38,020 38,357
Operating segments | Midstream and Refining    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of period 283  
Property, plant and equipment at end of period 276 283
Head Office    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of period 114  
Property, plant and equipment at end of period 116 114
Cost    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of period 137,082 131,895
Additions/Acquisitions 5,356 5,960
Transfers from exploration and evaluation assets 71 223
Derecognitions (864) (909)
Disposals (35)  
Foreign exchange adjustments and other (797) 87
Property, plant and equipment at end of period 142,407 137,082
Cost | Operating segments | North America    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of period 77,834 73,997
Additions/Acquisitions 3,564 4,146
Transfers from exploration and evaluation assets 71 73
Derecognitions (394) (382)
Disposals 0  
Foreign exchange adjustments and other 0 0
Property, plant and equipment at end of period 81,075 77,834
Cost | Operating segments | North Sea    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of period 7,438 7,283
Additions/Acquisitions 304 208
Transfers from exploration and evaluation assets 0 0
Derecognitions (1) 3
Disposals 0  
Foreign exchange adjustments and other (517) 56
Property, plant and equipment at end of period 8,258 7,438
Cost | Operating segments | Offshore Africa    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of period 3,980 3,963
Additions/Acquisitions 75 48
Transfers from exploration and evaluation assets 0 0
Derecognitions 0 0
Disposals 0  
Foreign exchange adjustments and other (277) 31
Property, plant and equipment at end of period 4,332 3,980
Cost | Operating segments | Oil Sands Mining and Upgrading    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of period 46,856 45,710
Additions/Acquisitions 1,380 1,526
Transfers from exploration and evaluation assets 0 150
Derecognitions (469) (530)
Disposals (35)  
Foreign exchange adjustments and other 0 0
Property, plant and equipment at end of period 47,732 46,856
Cost | Operating segments | Midstream and Refining    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of period 466 457
Additions/Acquisitions 8 9
Transfers from exploration and evaluation assets 0 0
Derecognitions 0 0
Disposals 0  
Foreign exchange adjustments and other 0 0
Property, plant and equipment at end of period 474 466
Cost | Head Office    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of period 508 485
Additions/Acquisitions 25 23
Transfers from exploration and evaluation assets 0 0
Derecognitions 0 0
Disposals 0  
Foreign exchange adjustments and other (3) 0
Property, plant and equipment at end of period 536 508
Accumulated depletion and depreciation    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of period (70,682) (66,143)
Expense 5,489 5,508
Derecognitions 864 909
Disposals 2  
Recoverability charge 1,620  
Foreign exchange adjustments and other 623 (60)
Property, plant and equipment at end of period (77,548) (70,682)
Accumulated depletion and depreciation | Operating segments | North America    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of period (52,732) (49,641)
Expense 3,502 3,468
Derecognitions 394 382
Disposals 0  
Recoverability charge 0  
Foreign exchange adjustments and other (5) 5
Property, plant and equipment at end of period (55,835) (52,732)
Accumulated depletion and depreciation | Operating segments | North Sea    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of period (5,951) (5,853)
Expense 117 149
Derecognitions 1 (3)
Disposals 0  
Recoverability charge 1,620  
Foreign exchange adjustments and other 419 (54)
Property, plant and equipment at end of period (8,106) (5,951)
Accumulated depletion and depreciation | Operating segments | Offshore Africa    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of period (2,923) (2,822)
Expense 148 118
Derecognitions 0 0
Disposals 0  
Recoverability charge 0  
Foreign exchange adjustments and other 206 (17)
Property, plant and equipment at end of period (3,277) (2,923)
Accumulated depletion and depreciation | Operating segments | Oil Sands Mining and Upgrading    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of period (8,499) (7,289)
Expense 1,684 1,733
Derecognitions 469 530
Disposals 2  
Recoverability charge 0  
Foreign exchange adjustments and other 0 7
Property, plant and equipment at end of period (9,712) (8,499)
Accumulated depletion and depreciation | Operating segments | Midstream and Refining    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of period (183) (168)
Expense 15 15
Derecognitions 0 0
Disposals 0  
Recoverability charge 0  
Foreign exchange adjustments and other 0 0
Property, plant and equipment at end of period (198) (183)
Accumulated depletion and depreciation | Head Office    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of period (394) (370)
Expense 23 25
Derecognitions 0 0
Disposals 0  
Recoverability charge 0  
Foreign exchange adjustments and other 3 (1)
Property, plant and equipment at end of period $ (420) $ (394)