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SEGMENTED INFORMATION - Geographical information (Details) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Disclosure of operating segments [line items] |  |
Operating revenues, net of royalties | $ 38,344.0 | $ 38,542.0
Non-current assets excluding deferred income tax assets | 79,320.0 | 80,751.0
Canada |  |
Disclosure of operating segments [line items] |  |
Operating revenues, net of royalties | 31,157.0 | 30,813.0
Non-current assets excluding deferred income tax assets | 75,190.0 | 76,708.0
United States |  |
Disclosure of operating segments [line items] |  |
Operating revenues, net of royalties | 5,737.0 | 5,999.0
Non-current assets excluding deferred income tax assets | 1,957.0 | 1,889.0
Other foreign |  |
Disclosure of operating segments [line items] |  |
Operating revenues, net of royalties | 1,450.0 | 1,730.0
Non-current assets excluding deferred income tax assets | $ 2,173.0 | $ 2,154.0

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