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SEGMENTED INFORMATION - Segmented Assets (Details) - CAD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Disclosure of operating segments [line items] |  |
Assets | $ 73,867 | $ 58,648
Non-segmented |  |
Disclosure of operating segments [line items] |  |
Assets | 110 | 114
North America | Operating segments |  |
Disclosure of operating segments [line items] |  |
Assets | 28,705 | 28,892
North Sea | Operating segments |  |
Disclosure of operating segments [line items] |  |
Assets | 1,854 | 2,269
Offshore Africa | Operating segments |  |
Disclosure of operating segments [line items] |  |
Assets | 1,331 | 1,580
Other | Operating segments |  |
Disclosure of operating segments [line items] |  |
Assets | 29 | 29
Oil Sands Mining and Upgrading | Operating segments |  |
Disclosure of operating segments [line items] |  |
Assets | 40,559 | 24,852
Midstream | Operating segments |  |
Disclosure of operating segments [line items] |  |
Assets | $ 1,279 | $ 912

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