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Other Liabilities - Summary of Other Liabilities (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of non-current liabilities [Line Items]    
Pension and Other Post-Employment Benefit Plans $ 288 $ 91
Provision for West White Rose Expansion Project (1) 259 0
Provisions for Onerous and Unfavourable Contracts 99 39
Employee Long-Term Incentives 74 33
Drilling Provisions 56 0
Deferred Revenue 41 0
Other 112 18
Other Liabilities 929 $ 181
Acquisition 37  
Take-or-Pay Payments Received $ 4  
West White Rose Expansion Project    
Disclosure of non-current liabilities [Line Items]    
Percentage of working interest acquired 69.00%