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STOCK OPTION AND STOCK UNIT PLANS - PSUs AND RSUs (Details)
shares in Thousands, CAD in Millions
12 Months Ended
Dec. 31, 2016
CAD
item
shares
Dec. 31, 2015
CAD
shares
Dec. 31, 2014
CAD
PERFORMANCE STOCK UNITS      
STOCK OPTION AND STOCK UNIT PLANS      
Vesting period 3 years    
Period prior to the maturity of the grant for which weighted average share price is used to calculate cash awards 20 days    
Performance multiplier | item 2    
Number      
Units outstanding at beginning of year (in shares) 536    
Units granted (in shares) 294    
Units cancelled (in shares) (14)    
Units matured (in shares) (295)    
Dividend reinvestment (in shares) 35    
Units outstanding at end of year (in shares) 556 536  
Weighted Average Remaining Contractual Life (years)      
Units outstanding at end of year 1 year 6 months    
Aggregate Intrinsic Value      
Units outstanding at end of year (in Canadian dollars) | CAD CAD 54    
Stock units, additional disclosures      
Total amount paid (in Canadian dollars) | CAD 22 CAD 35 CAD 36
Compensation expense (in Canadian dollars) | CAD 33 CAD 12 40
Unrecognized compensation expense related to non-vested units granted (in Canadian dollars) | CAD CAD 30    
Weighted average period over which compensation cost is expected to be recognized 2 years    
PERFORMANCE STOCK UNITS | Minimum      
STOCK OPTION AND STOCK UNIT PLANS      
Performance multiplier | item 0    
PERFORMANCE STOCK UNITS | Maximum      
STOCK OPTION AND STOCK UNIT PLANS      
Performance multiplier | item 2    
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) 1,906    
Units granted (in shares) 972    
Units cancelled (in shares) (154)    
Units matured (in shares) (992)    
Dividend reinvestment (in shares) 122    
Units outstanding at end of year (in shares) 1,854 1,906  
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 (in Canadian dollars) | CAD CAD 105    
Stock units, additional disclosures      
Total amount paid (in Canadian dollars) | CAD 56 CAD 45 45
Compensation expense (in Canadian dollars) | CAD 51 CAD 47 CAD 44
Unrecognized compensation expense related to non-vested units granted (in Canadian dollars) | CAD CAD 62    
Weighted average period over which compensation cost is expected to be recognized 1 year