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CAPITAL STOCK (Details) - $ / shares
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Common shares    
Disclosure of classes of share capital [line items]    
Number of shares issued (shares) 1,167,158,762  
Par value per share (in dollars per share) $ 0  
Preferred shares | First Preferred Shares, Series A    
Disclosure of classes of share capital [line items]    
Number of shares issued (shares) 0  
Number of shares authorized (shares) 10,000,000  
Preferred shares | First Preference Shares, Series B    
Disclosure of classes of share capital [line items]    
Number of shares issued (shares) 0  
Number of shares authorized (shares) 10,000,000  
Preferred shares | First Preferred Shares, Series C Special Voting Share    
Disclosure of classes of share capital [line items]    
Number of shares issued (shares) 0  
Number of shares authorized (shares) 1  
Preferred shares | Second Preferred Shares, Series A    
Disclosure of classes of share capital [line items]    
Number of shares issued (shares) 0  
Number of shares authorized (shares) 15,000,000  
Capital stock    
Disclosure of classes of share capital [line items]    
Number of Shares Issued in Dividend Reinvestment Plan with Owners 571,284 429,000