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FINANCIAL INSTRUMENTS AND RISK MANAGEMENT - Non Designated Derivative Financial Instruments (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Derivative financial instrument assets and liabilities and assets available for sale measured at fair value |  |
Fair value outstanding, beginning of year | $ 89,435 |
Fair value outstanding, end of year | 84,616 | $ 89,435
At fair value |  |
Derivative financial instrument assets and liabilities and assets available for sale measured at fair value |  |
Fair value outstanding, beginning of year | (39) |
Cash Settlements - received during the year | (257) | (254)
Fair value outstanding, end of year | (121) | (39)
Fair value outstanding, beginning of year |  | 60
Changes in fair value recognized in earnings during the year (note 7) | $ 175 | $ 155

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