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Decommissioning Liabilities - Additional Information (Detail) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2022 CAD ($) | Dec. 31, 2021 CAD ($)
Provision for decommissioning, restoration and rehabilitation costs [abstract] |  |
Credit-adjusted risk-free rate | 6.20% | 4.40%
Restricted Cash | $ 213 | $ 186
Inflation rate | 0.02 | 0.02

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