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Decommissioning Liabilities - Additional Information (Detail) - CAD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020
Disclosure of other provisions [line items] |  |
Estimated future cash flows required to settle the obligation | $ 14,000 | $ 5,000
Credit-adjusted risk-free rate | 4.40% | 5.00%
Inflation Rate | 2.00% | 2.00%
Restricted Cash | $ 186 | $ 0
Bottom of range |  |
Disclosure of other provisions [line items] |  |
Expected settlement of decommissioning liabilities | $ 230 |

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