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Impairment Charges and Reversals - Summary of Impairment Losses and Estimated Recoverable Amounts (Detail)
$ in Millions
 12 Months Ended
Dec. 31, 2020
CAD ($)
Clearwater [Member]  
Disclosure Of Information For Each Material Impairment Loss Recognised Or Reversed For Individual Asset Or Cashgenerating Unit [Line Items]  
Impairment amount $ 260
Recoverable amount 160
Elmworth-Wapiti [Member]  
Disclosure Of Information For Each Material Impairment Loss Recognised Or Reversed For Individual Asset Or Cashgenerating Unit [Line Items]  
Impairment amount 120
Recoverable amount 259
Kaybob-Edson [Member]  
Disclosure Of Information For Each Material Impairment Loss Recognised Or Reversed For Individual Asset Or Cashgenerating Unit [Line Items]  
Impairment amount 175
Recoverable amount $ 384