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Other Long-Term Liabilities - Segmented Asset Retirement Obligations (Details) - CAD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
Disclosure of operating segments [line items] |  |  |  |
Asset retirement obligations | $ 6,806 | $ 5,861 | $ 5,771 | $ 3,886
North America |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Asset retirement obligations | 4,021 | 2,899 |  |
North Sea |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Asset retirement obligations | 821 | 787 |  |
Offshore Africa |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Asset retirement obligations | 170 | 174 |  |
Oil Sands Mining and Upgrading |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Asset retirement obligations | 1,793 | 1,999 |  |
Midstream and Refining |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Asset retirement obligations | $ 1 | $ 2 |  |

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