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FINANCIAL RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Interest Rate Risk (Details) - CAD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Equity price risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Share price of publicly traded investments, change $ 1  
Impact on net income 0 $ 0
Impact on other comprehensive income $ 14,000,000 14,000,000
Currency risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Expenditure derivatives - change in foreign exchange rate, change in Cdn% relative to US$ (in dollars per share) $ 0.01  
Impact on net income $ 0 0
Impact on other comprehensive income $ 12,000,000 7,000,000
Interest rate risk | Short-term borrowings    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Short-term borrowings, percent change in interest rates 1.00%  
Impact on net income $ 9,000,000 17,000,000
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 93.60% 87.20%
Floating interest rate | Interest rate risk | Senior Notes Due 2022    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Short-term borrowings, percent change in interest rates 1.00%  
Impact on net income $ 7,000,000 $ 0
Impact on other comprehensive income $ 0 $ 0