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FINANCIAL RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Interest Rate Risk (Details)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2018
CAD ($)
Dec. 31, 2017
CAD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Senior notes        
Disclosure of nature and extent of risks arising from financial instruments [line items]        
Notional amount     $ 750 $ 0
Equity price risk        
Disclosure of nature and extent of risks arising from financial instruments [line items]        
Impact on net income $ 0 $ 0    
Impact on other comprehensive income 14 14    
Currency risk        
Disclosure of nature and extent of risks arising from financial instruments [line items]        
Impact on net income 0 0    
Impact on other comprehensive income 8 9    
Interest rate risk | Short-term borrowings        
Disclosure of nature and extent of risks arising from financial instruments [line items]        
Impact on net income 17 12    
Impact on other comprehensive income $ 0 $ 0    
Fixed interest rate | Interest rate risk        
Disclosure of nature and extent of risks arising from financial instruments [line items]        
Percent of borrowings 85.30%   85.30% 89.50%
Cost prior to impairment losses | Floating interest rate | Senior Notes Due 2017        
Disclosure of nature and extent of risks arising from financial instruments [line items]        
Notional amount $ 250