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Impairment Charges and Reversals - Sensitivity (Details) - CAD ($)
$ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2020
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   $ (13) $ (5)
Decrease through change in discount rate, Impairments   13 6
Five percent increase through change in forward price estimates, Impairments   55 52
Five percent decrease through change in forward price estimates, Impairments   (54) (97)
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   (27) (7)
Decrease through change in discount rate, Impairments   28 8
Five percent increase through change in forward price estimates, Impairments   84 54
Five percent decrease through change in forward price estimates, Impairments   (81) (96)
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   (26) (13)
Decrease through change in discount rate, Impairments   26 14
Five percent increase through change in forward price estimates, Impairments   98 54
Five percent decrease through change in forward price estimates, Impairments   (97) $ (106)
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 $ (71)    
Decrease through change in discount rate, Impairments 81    
Five percent increase through change in forward price estimates, Impairments 263    
Five percent decrease through change in forward price estimates, Impairments $ (264)    
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   (190)  
Decrease through change in discount rate, Impairments   214  
Five percent increase through change in forward price estimates, Impairments   749  
Five percent decrease through change in forward price estimates, Impairments   $ (754)