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SHARE BASED COMPENSATION - Liability Recognized For Share-Based Compensation - (Details) - CAD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
SHARE BASED COMPENSATION    
Current Liability $ 117 $ 242
Long-Term Liability (note 21) 143 289
Total Liability 260 531
Intrinsic value of vested awards $ 149 $ 300