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STOCK OPTION AND STOCK UNIT PLANS - STOCK OPTION ACTIVITY (Details) - CAD
CAD / shares in Units, shares in Thousands, CAD in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2012
Dec. 31, 2008
Dec. 31, 2007
INCENTIVE STOCK OPTIONS            
STOCK OPTION AND STOCK UNIT PLANS            
Vesting period 4 years          
Expiration term 10 years          
Number            
Options outstanding at beginning of year (in shares) 32,788          
Options granted (in shares) 6,373          
Options exercised (in shares) (5,364)          
Options cancelled or expired (in shares) (888)          
Options outstanding at end of year (in shares) 32,909 32,788        
Options vested at end of year (in shares) 18,355          
Weighted Average Exercise Price            
Options outstanding at beginning of year (in Canadian dollars per share) CAD 40.31          
Options granted (in Canadian dollars per share) 44.05          
Options exercised (in Canadian dollars per share) 29.73          
Options cancelled or expired (in Canadian dollars per share) 49.26          
Options outstanding at end of year (in Canadian dollars per share) 42.51 CAD 40.31        
Options vested at end of year (in Canadian dollars per share) CAD 37.11          
Weighted Average Remaining Contractual Life (years)            
Options outstanding at end of year 6 years 3 months 18 days          
Options vested at end of year 4 years 10 months 24 days          
Aggregate Intrinsic Value            
Options outstanding at end of year (in Canadian dollars) CAD 335          
Options vested at end of year (in Canadian dollars) 286          
Stock options, additional disclosures            
Total intrinsic value of awards exercised (in Canadian dollars) 123 CAD 126 CAD 117      
Cash received on exercise of awards (in Canadian dollars) 37 43 37      
Total fair value of options vested (in Canadian dollars) CAD 36 CAD 34 CAD 26      
PERFORMANCE STOCK OPTIONS            
STOCK OPTION AND STOCK UNIT PLANS            
Vesting period     4 years 5 years 5 years 5 years
Number            
Options outstanding at beginning of year (in shares) 3,217          
Options exercised (in shares) (335)          
Options outstanding at end of year (in shares) 2,882 3,217        
Options vested at end of year (in shares) 2,409          
Weighted Average Exercise Price            
Options outstanding at beginning of year (in Canadian dollars per share) CAD 39.75          
Options exercised (in Canadian dollars per share) 41.29          
Options outstanding at end of year (in Canadian dollars per share) 39.57 CAD 39.75        
Options vested at end of year (in Canadian dollars per share) CAD 39.34          
Weighted Average Remaining Contractual Life (years)            
Options outstanding at end of year 3 years 2 months 12 days          
Options vested at end of year 3 years 2 months 12 days          
Aggregate Intrinsic Value            
Options outstanding at end of year (in Canadian dollars) CAD 38          
Options vested at end of year (in Canadian dollars) 32          
Stock options, additional disclosures            
Total intrinsic value of awards exercised (in Canadian dollars) 7 CAD 43 CAD 0      
Cash received on exercise of awards (in Canadian dollars) 3 13 0      
Total fair value of options vested (in Canadian dollars) CAD 2 CAD 6 CAD 5