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Other Liabilities - Summary of Other Liabilities (Detail) - CAD ($)
$ in Millions
 12 Months Ended
May 31, 2022
Dec. 31, 2022
Dec. 31, 2021
Disclosure of non-current liabilities [Line Items]      
Pension and Other Post-Employment Benefit Plan   $ 201 $ 288
Provision for West White Rose Expansion Project (1)   204 259
Provisions for Onerous and Unfavourable Contracts   95 99
Employee Long-Term Incentives   245 74
Drilling Provisions   31 56
Deferred Revenue   45 41
Other (2)   221 112
Other Liabilities   1,042 $ 929
Adjustment to West White Rose expansion project provision $ 47    
West white rose expansion project, expected draw down to provision   58  
RVO included in other liabilities, net   101  
RVO included in other liabilities, gross   1,100  
RINs included in other liabilities, gross   $ 1,000  
West White Rose Expansion Project      
Disclosure of non-current liabilities [Line Items]      
Percentage of working interest acquired 1250.00%