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Segmented Information - Segmented Assets (Details) - CAD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Disclosure of operating segments [line items] |  |
Assets | $ 76,665 | $ 75,276
Head office |  |
Disclosure of operating segments [line items] |  |
Assets | 185 | 202
North America | Operating segments |  |
Disclosure of operating segments [line items] |  |
Assets | 30,645 | 29,094
North Sea | Operating segments |  |
Disclosure of operating segments [line items] |  |
Assets | 1,561 | 1,624
Offshore Africa | Operating segments |  |
Disclosure of operating segments [line items] |  |
Assets | 1,332 | 1,407
Other | Operating segments |  |
Disclosure of operating segments [line items] |  |
Assets | 40 | 81
Oil Sands Mining and Upgrading | Operating segments |  |
Disclosure of operating segments [line items] |  |
Assets | 42,016 | 41,567
Midstream and Refining | Operating segments |  |
Disclosure of operating segments [line items] |  |
Assets | $ 886 | $ 1,301

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