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STOCK-BASED COMPENSATION - Employee Stock Options (Details)
shares in Millions
 12 Months Ended
Dec. 31, 2017
CAD ($)
shares
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2016
CAD ($)
shares
Dec. 31, 2016
USD ($)
shares
Canada        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Number of options at January 1 (shares) | shares 0.3 0.3 0.3 0.3
Number of options granted (shares) | shares 0.0 0.0 0.0 0.0
Number of options cancelled/expired (shares) | shares 0.0 0.0 0.0 0.0
Number of options at December 31 (shares) | shares 0.3 0.3 0.3 0.3
Average price of stock options outstanding at January 1 (in dollars per share) | $ $ 13   $ 13  
Average price of options granted (in dollars per share) | $ 0   0  
Average price of options cancelled/expired (in dollars per share) | $ 0   0  
Average price of stock options outstanding at December 31 (in dollars per share) | $ $ 13   $ 13  
United States        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Number of options at January 1 (shares) | shares 1.8 1.8 2.6 2.6
Number of options forfeited (shares) | shares (0.7) (0.7) (0.4) (0.4)
Number of options cancelled/expired (shares) | shares (0.4) (0.4) (0.4) (0.4)
Number of options at December 31 (shares) | shares 0.7 0.7 1.8 1.8
Average price of stock options outstanding at January 1 (in dollars per share) | $   $ 42   $ 42
Average price of options forfeited (in dollars per share) | $   40   45
Average price of options cancelled/expired (in dollars per share) | $   45   39
Average price of stock options outstanding at December 31 (in dollars per share) | $   $ 40   $ 42