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Impairment Charges and Reversals - Sensitivity (Details) - CAD ($)
$ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2020
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Clearwater        
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]        
Increase through change in discount rate, impairments       $ 7
Decrease through change in discount rate, impairments       (7)
Five percent increase through change in forward price estimates, Impairments       (68)
Five percent decrease through change in forward price estimates, Impairments       128
Elmworth-Wapiti        
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]        
Increase through change in discount rate, impairments       10
Decrease through change in discount rate, impairments       (10)
Five percent increase through change in forward price estimates, Impairments       (71)
Five percent decrease through change in forward price estimates, Impairments       126
Kaybob-Edson        
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]        
Increase through change in discount rate, impairments       17
Decrease through change in discount rate, impairments       (19)
Five percent increase through change in forward price estimates, Impairments       (71)
Five percent decrease through change in forward price estimates, Impairments       $ 140
Borger, Wood River, and Lima CGUs        
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]        
Increase through change in discount rate, impairments   $ 69 $ 251  
Decrease through change in discount rate, impairments   (65) (283)  
Five percent increase through change in forward price estimates, Impairments   (268) (990)  
Five percent decrease through change in forward price estimates, Impairments   268 $ 996  
One percent increase through change in discount rate, impairment reversal   (72)    
One percent decrease through change in discount rate, impairment reversal   14    
Five percent increase through change in forward price estimates, impairment reversal   168    
Five percent decrease through change in forward price estimates, impairment reversal   $ (342)    
Borger CGU        
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]        
Increase through change in discount rate, impairments $ 89      
Decrease through change in discount rate, impairments (110)      
Five percent increase through change in forward price estimates, Impairments (348)      
Five percent decrease through change in forward price estimates, Impairments $ 342