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Other Liabilities - Summary of Other Liabilities (Detail) - CAD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Miscellaneous non-current liabilities [abstract]    
Pension and Other Post-Employment Benefit Plan $ 309 $ 91
Provision for West White Rose Expansion Project 259 0
Provisions for Onerous Contracts 109 39
Employee Long-Term Incentives 108 33
Drilling Provisions 56 0
Deferred Revenue 42 0
Other 96 18
Other Liabilities $ 979 $ 181