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FINANCIAL INSTRUMENTS AND RISK MANAGEMENT - Non Designated Derivative Financial Instruments (Details) - Non-Designated Derivative Financial Instruments - At fair value - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Derivative Financial Instrument |  |
Fair value outstanding, beginning of year | $ (121) | $ (39)
Cash settlements - paid (received) during the year | 178 | (257)
Changes in fair value recognized in earnings during the year (note 7) | (155) | 175
Fair value outstanding, end of year | $ (98) | $ (121)

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