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Other Long-Term Liabilities - Segmented Asset Retirement Obligations (Details) - CAD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | ---
Disclosure of operating segments [line items] |  |  |  |
Asset retirement obligations | $ 7,690 | $ 6,908 | $ 6,806 | $ 5,861
North America |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Asset retirement obligations | 4,471 | 4,326 |  |
North Sea |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Asset retirement obligations | 1,441 | 1,011 |  |
Offshore Africa |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Asset retirement obligations | 165 | 143 |  |
Oil Sands Mining and Upgrading |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Asset retirement obligations | 1,612 | 1,427 |  |
Midstream and Refining |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Asset retirement obligations | $ 1 | $ 1 |  |

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