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FINANCIAL INSTRUMENTS AND RISK MANAGEMENT - Non Derivative Financial Instruments (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 CAD ($) | Dec. 31, 2019 CAD ($)
Non Derivative Financial Instruments |  |
Partnership liability | $ 445 | $ 455
East Tank Farm Development | Fort McKay First Nation and the Mikisew Cree First Nation Partnership |  |
Non Derivative Financial Instruments |  |
Percentage of ownership interest acquired | 49 |
Fixed Term Notes |  |
Non Derivative Financial Instruments |  |
Borrowings excluding short term debt | $ 15,279 | 12,927
Fair value of fixed term debt | $ 18,800 | $ 16,100

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