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Segmented Information - Segmented Assets (Details) - CAD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Disclosure of operating segments [line items] |  |
Assets | $ 78,121 | $ 71,559
Head office |  |
Disclosure of operating segments [line items] |  |
Assets | 227 | 110
North America | Operating segments |  |
Disclosure of operating segments [line items] |  |
Assets | 30,963 | 27,199
North Sea | Operating segments |  |
Disclosure of operating segments [line items] |  |
Assets | 1,948 | 1,699
Offshore Africa | Operating segments |  |
Disclosure of operating segments [line items] |  |
Assets | 1,529 | 1,471
Other | Operating segments |  |
Disclosure of operating segments [line items] |  |
Assets | 30 | 33
Oil Sands Mining and Upgrading | Operating segments |  |
Disclosure of operating segments [line items] |  |
Assets | 42,006 | 39,634
Midstream and Refining | Operating segments |  |
Disclosure of operating segments [line items] |  |
Assets | $ 1,418 | $ 1,413

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