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RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Counterparty Credit Risk (Details)
CAD in Millions, $ in Millions
12 Months Ended
Dec. 31, 2016
USD ($)
Dec. 31, 2016
CAD
Dec. 31, 2015
USD ($)
Dec. 31, 2015
CAD
Concentration Risk [Line Items]        
Financing receivable, recorded investment, past due   CAD 0    
Provision for other credit losses   0    
Customer Concentration Risk        
Concentration Risk [Line Items]        
Credit risk concentration $ 149 CAD 200 $ 179 CAD 248