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Segmented Information - Capital Expenditures (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Exploration and evaluation assets    
Net expenditures $ 44 $ 33
Non-cash and fair value changes (61) (59)
Capitalized  costs (17) (26)
Property, plant and equipment    
Net expenditures 4,865 5,103
Non-cash and fair value changes (29) (575)
Capitalized  costs 4,836 4,528
Net expenditures 4,909 5,136
Total non-cash and fair value changes (90) (634)
Total capitalised costs 4,819 4,502
Operating segments | Exploration and    Production    
Property, plant and equipment    
Net expenditures 2,931 3,350
Non-cash and fair value changes 222 269
Capitalized  costs 3,153 3,619
Operating segments | North America    
Exploration and evaluation assets    
Net expenditures 41 28
Non-cash and fair value changes (36) (59)
Capitalized  costs 5 (31)
Property, plant and equipment    
Net expenditures 2,729 3,105
Non-cash and fair value changes (321) 136
Capitalized  costs 2,408 3,241
Operating segments | North Sea    
Property, plant and equipment    
Net expenditures 33 126
Non-cash and fair value changes 525 177
Capitalized  costs 558 303
Operating segments | Offshore Africa    
Exploration and evaluation assets    
Net expenditures 3 5
Non-cash and fair value changes 0 0
Capitalized  costs 3 5
Property, plant and equipment    
Net expenditures 169 119
Non-cash and fair value changes 18 (44)
Capitalized  costs 187 75
Operating segments | Oil Sands Mining and Upgrading    
Exploration and evaluation assets    
Net expenditures 0 0
Non-cash and fair value changes (25) 0
Capitalized  costs (25) 0
Property, plant and equipment    
Net expenditures 1,894 1,719
Non-cash and fair value changes (251) (843)
Capitalized  costs 1,643 876
Operating segments | Midstream and Refining    
Property, plant and equipment    
Net expenditures 10 9
Non-cash and fair value changes 0 (1)
Capitalized  costs 10 8
Head Office    
Property, plant and equipment    
Net expenditures 30 25
Non-cash and fair value changes 0 0
Capitalized  costs $ 30 $ 25