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RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - MARKET RISK (Details)
CAD in Millions
6 Months Ended
Jun. 30, 2016
CAD
item
Dec. 31, 2015
CAD
Fair Value Hedges    
Fair value hedges | CAD CAD 0 CAD 0
Maximum    
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS    
Floating rate debt as a percentage of total debt outstanding 25.00%  
Foreign Exchange Risk    
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS    
Period to hedge a minimum level of foreign currency denominated earnings exposures 5 years  
Interest rate contracts - short-term borrowings    
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS    
Average swap rate (as a percent) 2.20%  
Interest rate contracts - long-term debt    
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS    
Average swap rate (as a percent) 3.40%  
Equity contracts    
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS    
Number of forms of stock-based compensation with equity price risk | item 1