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STOCK OPTION AND STOCK UNIT PLANS - PERFORMANCE STOCK UNITS (Details)
shares in Thousands, CAD in Millions
12 Months Ended
Dec. 31, 2015
CAD
item
shares
Dec. 31, 2014
CAD
shares
Dec. 31, 2013
CAD
PERFORMANCE STOCK UNITS      
STOCK OPTION AND STOCK UNIT PLANS      
Period of performance cycle 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    
Outstanding stock units      
Units outstanding at beginning of year (in shares) 555    
Units granted (in shares) 244    
Units cancelled (in shares) (9)    
Units matured (in shares) (282)    
Dividend reinvestment (in shares) 28    
Units outstanding at end of year (in shares) 536 555  
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 47    
Stock units, additional disclosures      
Total amount paid (in Canadian dollars) | CAD 35 CAD 36 CAD 48
Compensation expense (in Canadian dollars) | CAD 12 CAD 40 25
Unrecognized compensation expense related to non-vested units granted (in Canadian dollars) | CAD CAD 28    
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      
STOCK OPTION AND STOCK UNIT PLANS      
Maturity 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    
Outstanding stock units      
Units outstanding at beginning of year (in shares) 1,959    
Units granted (in shares) 854    
Units cancelled (in shares) (101)    
Units matured (in shares) (904)    
Dividend reinvestment (in shares) 98    
Units outstanding at end of year (in shares) 1,906 1,959  
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 88    
Stock units, additional disclosures      
Total amount paid (in Canadian dollars) | CAD 45 CAD 45 41
Compensation expense (in Canadian dollars) | CAD 47 CAD 44 CAD 36
Unrecognized compensation expense related to non-vested units granted (in Canadian dollars) | CAD CAD 64    
Weighted average period over which compensation cost is expected to be recognized   1 year