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CAPITAL STOCK (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of classes of share capital [line items]    
Dividends paid $ 125 $ 86
Common shares    
Disclosure of classes of share capital [line items]    
Number of shares issued (shares) 1,166,577,478  
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]    
Dividends reinvested $ 16 $ 8