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STOCK OPTION AND STOCK UNIT PLANS - PSUs AND RSUs (Details) - CAD ($)
shares in Thousands, $ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Stock units, additional disclosures      
Compensation expense $ 106 $ 165 $ 130
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) 1,693    
Units granted (in shares) 542    
Units cancelled (in shares) (191)    
Units matured (in shares) (971)    
Dividend reinvestment (in shares) 140    
Units outstanding at end of year (in shares) 1,213 1,693  
Weighted Average Remaining Contractual Life (years)      
Units outstanding at end of year 1 year 3 months 19 days    
Aggregate Intrinsic Value      
Units outstanding at end of year $ 52    
Stock units, additional disclosures      
Total amount paid 41 $ 39 56
Compensation expense 32 $ 46 $ 51
Unrecognized compensation expense related to non-vested units granted $ 26    
Weighted average period over which compensation cost is expected to be recognized 2 years