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SHARE BASED COMPENSATION - Liability Recognized For Share-Based Compensation - (Details) - CAD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
SHARE BASED COMPENSATION    
Current Liability $ 242 $ 286
Long-Term Liability (note 21) 289 259
Total Liability 531 545
Intrinsic value of vested awards $ 300 $ 328