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Other Income (Loss), Net (Details) - CAD ($) $ in Millions | 12 Months Ended | 48 Months Ended
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2021
Disclosure of attribution of expenses by nature to their function [line items] |  |  |  |
Insurance proceeds | $ 0 |  |  | $ 135
Decommissioning Liabilities | 3,559 | $ 3,906 | $ 1,248 | 3,906
Site Rehabilitation Program |  |  |  |
Disclosure of attribution of expenses by nature to their function [line items] |  |  |  |
Decommissioning Liabilities | 65 | 42 | 0 | $ 42
2018 Atlantic Region Incident |  |  |  |
Disclosure of attribution of expenses by nature to their function [line items] |  |  |  |
Insurance proceeds | $ 328 | $ 120 | $ 0 |

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