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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

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