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Segmented Information - Capital Expenditures (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Exploration and evaluation assets    
Net expenditures $ 33 $ 1
Non-cash and fair value changes (59) (186)
Capitalized  costs (26) (185)
Property, plant and equipment    
Net expenditures 5,103 4,492
Non-cash and fair value changes (575) 782
Capitalized  costs 4,528 5,274
Net expenditures 5,136 4,493
Total non-cash and fair value changes (634) 596
Total capitalised costs 4,502 $ 5,089
Percentage of net carried interest   5.00%
STORM Resources Ltd    
Property, plant and equipment    
Total purchase consideration   $ 771
Operating segments | Exploration and    Production    
Property, plant and equipment    
Net expenditures 3,350 2,713
Non-cash and fair value changes 269 1,383
Capitalized  costs 3,619 4,096
Operating segments | North America    
Exploration and evaluation assets    
Net expenditures 28 (7)
Non-cash and fair value changes (59) (36)
Capitalized  costs (31) (43)
Property, plant and equipment    
Net expenditures 3,105 2,486
Non-cash and fair value changes 136 1,351
Capitalized  costs 3,241 3,837
Operating segments | North Sea    
Property, plant and equipment    
Net expenditures 126 173
Non-cash and fair value changes 177 38
Capitalized  costs 303 211
Operating segments | Offshore Africa    
Exploration and evaluation assets    
Net expenditures 5 8
Non-cash and fair value changes 0 0
Capitalized  costs 5 8
Property, plant and equipment    
Net expenditures 119 54
Non-cash and fair value changes (44) (6)
Capitalized  costs 75 48
Operating segments | Oil Sands Mining and Upgrading    
Exploration and evaluation assets    
Net expenditures 0 0
Non-cash and fair value changes 0 (150)
Capitalized  costs 0 (150)
Property, plant and equipment    
Net expenditures 1,719 1,747
Non-cash and fair value changes (843) (601)
Capitalized  costs 876 1,146
Operating segments | Midstream and Refining    
Property, plant and equipment    
Net expenditures 9 9
Non-cash and fair value changes (1) 0
Capitalized  costs 8 9
Head Office    
Property, plant and equipment    
Net expenditures 25 23
Non-cash and fair value changes 0 0
Capitalized  costs $ 25 $ 23