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Impairment Charges and Reversals - Summary of Impairment Losses and Estimated Recoverable Amounts (Detail) - CAD ($)
$ in Millions
 12 Months Ended
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]    
Reversal of impairment loss recognised in profit or loss $ 145  
Recoverable Amount 427 $ 160
CGU Impairments   260
Elmworth-Wapiti    
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]    
Reversal of impairment loss recognised in profit or loss 115  
Recoverable Amount 747 259
CGU Impairments   120
Kaybob-Edson    
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]    
Reversal of impairment loss recognised in profit or loss 118  
Recoverable Amount $ 837 384
CGU Impairments   $ 175