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STOCK OPTION AND STOCK UNIT PLANS - PSUs AND RSUs (Details) - CAD
shares in Thousands, CAD in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Stock units, additional disclosures      
Compensation expense CAD 165 CAD 130 CAD 97
Restricted Stock Units (RSU)      
STOCK OPTION AND STOCK UNIT PLANS      
Vesting period 35 months    
Period prior to the maturity of the grant for which weighted average share price is used to calculate cash awards 20 days    
Number      
Units outstanding at beginning of year (in shares) 1,854    
Units granted (in shares) 741    
Units cancelled (in shares) (186)    
Units matured (in shares) (839)    
Dividend reinvestment (in shares) 123    
Units outstanding at end of year (in shares) 1,693 1,854  
Weighted Average Remaining Contractual Life (years)      
Units outstanding at end of year 1 year 4 months 24 days    
Aggregate Intrinsic Value      
Units outstanding at end of year CAD 83    
Stock units, additional disclosures      
Total amount paid 39 CAD 56 45
Compensation expense 46 CAD 51 CAD 47
Unrecognized compensation expense related to non-vested units granted CAD 48    
Weighted average period over which compensation cost is expected to be recognized 1 year