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SHARE BASED COMPENSATION (Details) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
SHARE BASED COMPENSATION |  |
Equity-settled plans | $ 32 | $ 50
Cash-settled plans | (28) | 274
Total share-based compensation expense | $ 4 | $ 324

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