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STOCK OPTION AND STOCK UNIT PLANS - WEIGHTED AVERAGE ASSUMPTIONS (Details)
CAD / shares in Units, CAD in Millions
12 Months Ended
Dec. 31, 2016
CAD
Dec. 31, 2015
CAD
CAD / shares
Dec. 31, 2014
CAD
CAD / shares
Dec. 31, 2016
$ / shares
Dec. 31, 2016
CAD
CAD / shares
Dec. 31, 2015
$ / shares
Dec. 31, 2014
$ / shares
INCENTIVE STOCK OPTIONS              
Weighted average assumptions used to determine the fair value of options              
Fair value per option (in Canadian or US dollars) | CAD / shares   CAD 6.48 CAD 5.53   CAD 7.37    
Expected option term (in years) 5 years 5 years 5 years        
Expected volatility (as a percent) 25.10% 19.90% 16.90%        
Expected dividend yield (as a percent) 4.40% 3.20% 2.90%        
Risk-free interest rate (as a percent) 0.80% 0.90% 1.60%        
Expected option term based on historical practice 6 years            
Expected option term based on historical practice for retirement eligible employees 3 years            
Compensation expense (in Canadian dollars) CAD 43 CAD 35 CAD 29        
Unrecognized compensation cost related to non-vested share-based compensation arrangements granted (in Canadian dollars)         CAD 50    
Weighted average period over which compensation cost is expected to be recognized 2 years            
INCENTIVE STOCK OPTIONS | Canadian employees              
Weighted average assumptions used to determine the fair value of options              
Fair value per option (in Canadian or US dollars) | CAD / shares   CAD 6.22 CAD 5.45   CAD 7.01    
INCENTIVE STOCK OPTIONS | United States employees              
Weighted average assumptions used to determine the fair value of options              
Fair value per option (in Canadian or US dollars) | $ / shares       $ 6.60   $ 6.16 $ 5.35
PERFORMANCE STOCK OPTIONS              
Weighted average assumptions used to determine the fair value of options              
Fair value per option (in Canadian or US dollars) | CAD / shares     CAD 5.77        
Expected option term (in years)     6 years 6 months        
Expected volatility (as a percent)     15.00%        
Expected dividend yield (as a percent)     2.80%        
Risk-free interest rate (as a percent)     1.70%        
Compensation expense (in Canadian dollars) CAD 3 CAD 3 CAD 3        
Unrecognized compensation cost related to non-vested share-based compensation arrangements granted (in Canadian dollars)         CAD 2    
Weighted average period over which compensation cost is expected to be recognized 1 year