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SEGMENTED INFORMATION - Geographical information (Details) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Disclosure of operating segments [line items] |  |
Operating revenues, net of royalties | $ 24,662 | $ 38,344
Non-current assets excluding deferred income tax assets | 75,021 | 79,320
Canada |  |
Disclosure of operating segments [line items] |  |
Operating revenues, net of royalties | 20,588 | 31,157
Non-current assets excluding deferred income tax assets | 71,040 | 75,190
United States |  |
Disclosure of operating segments [line items] |  |
Operating revenues, net of royalties | 3,312 | 5,737
Non-current assets excluding deferred income tax assets | 1,856 | 1,957
Other foreign |  |
Disclosure of operating segments [line items] |  |
Operating revenues, net of royalties | 762 | 1,450
Non-current assets excluding deferred income tax assets | $ 2,125 | $ 2,173

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