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Asset Retirement Obligations - Additional Information (Details) - Asset retirement obligation - CAD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure of other provisions [line items] |  |  |
Estimated cash flows, undiscounted amount | $ 721,700 | $ 721,000 |
Estimated inflation rate | 1.80% | 1.50% |
Estimated risk free rate | 1.70% | 1.20% |
Other provisions | $ 743,683 | $ 760,383 | $ 667,974
Other provisions, period of costs being incurred | 60 years |  |

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