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STOCK-BASED COMPENSATION - Stock Options (Details)
$ / shares in Units, $ / shares in Units, shares in Millions
Dec. 31, 2018
CAD ($)
shares
year
$ / shares
Dec. 31, 2018
USD ($)
shares
year
$ / shares
Dec. 31, 2017
CAD ($)
shares
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2016
CAD ($)
shares
Dec. 31, 2016
USD ($)
shares
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]            
Closing market share price (in dollars per share) | (per share) $ 18.43 $ 13.54        
Canada            
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]            
Stock options outstanding (shares) | shares 0.3 0.3 0.3 0.3 0.3 0.3
Stock options outstanding, average price (in dollars per share) $ 13   $ 13   $ 13  
Stock options outstanding, average life | year 2.9 2.9        
Stock options outstanding, intrinsic value $ 0          
Stock options exercisable (in shares) | shares 0.2 0.2        
Stock options exercisable, average price (in dollars per option) $ 13          
Stock options exercisable, intrinsic value $ 0          
United States            
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]            
Stock options outstanding (shares) | shares 0.5 0.5 0.7 0.7 1.8 1.8
Stock options outstanding, average price (in dollars per share)   $ 37   $ 40   $ 42
Stock options outstanding, average life | year 0.8 0.8        
Stock options outstanding, intrinsic value   $ 0        
Stock options exercisable (in shares) | shares 0.5 0.5        
Stock options exercisable, average price (in dollars per option)   $ 37        
Stock options exercisable, intrinsic value   $ 0        
$9 - $17 | Minimum            
Disclosure of range of exercise prices of outstanding share options [line items]            
Exercise price of outstanding options (in dollars per share) $ 9          
$9 - $17 | Maximum            
Disclosure of range of exercise prices of outstanding share options [line items]            
Exercise price of outstanding options (in dollars per share) $ 17          
$9 - $17 | Canada            
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]            
Stock options outstanding (shares) | shares 0.2 0.2        
Stock options outstanding, average price (in dollars per share) $ 10          
Stock options outstanding, average life | year 3.6 3.6        
Stock options outstanding, intrinsic value $ 0          
Stock options exercisable (in shares) | shares 0.1 0.1        
Stock options exercisable, average price (in dollars per option) $ 10          
Stock options exercisable, intrinsic value 0          
$18 - $21 | Minimum            
Disclosure of range of exercise prices of outstanding share options [line items]            
Exercise price of outstanding options (in dollars per share) 18          
$18 - $21 | Maximum            
Disclosure of range of exercise prices of outstanding share options [line items]            
Exercise price of outstanding options (in dollars per share) $ 21          
$18 - $21 | Canada            
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]            
Stock options outstanding (shares) | shares 0.1 0.1        
Stock options outstanding, average price (in dollars per share) $ 18          
Stock options outstanding, average life | year 1.6 1.6        
Stock options outstanding, intrinsic value $ 0          
Stock options exercisable (in shares) | shares 0.1 0.1        
Stock options exercisable, average price (in dollars per option) $ 18          
Stock options exercisable, intrinsic value $ 0          
$32 - $41 | Minimum            
Disclosure of range of exercise prices of outstanding share options [line items]            
Exercise price of outstanding options (in dollars per share)   $ 32        
$32 - $41 | Maximum            
Disclosure of range of exercise prices of outstanding share options [line items]            
Exercise price of outstanding options (in dollars per share)   $ 41        
$32 - $41 | United States            
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]            
Stock options outstanding (shares) | shares 0.4 0.4        
Stock options outstanding, average price (in dollars per share)   $ 32        
Stock options outstanding, average life | year 1.0 1.0        
Stock options outstanding, intrinsic value   $ 0        
Stock options exercisable (in shares) | shares 0.4 0.4        
Stock options exercisable, average price (in dollars per option)   $ 32        
Stock options exercisable, intrinsic value   0        
$42 - $55 | Minimum            
Disclosure of range of exercise prices of outstanding share options [line items]            
Exercise price of outstanding options (in dollars per share)   42        
$42 - $55 | Maximum            
Disclosure of range of exercise prices of outstanding share options [line items]            
Exercise price of outstanding options (in dollars per share)   $ 55        
$42 - $55 | United States            
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]            
Stock options outstanding (shares) | shares 0.1 0.1        
Stock options outstanding, average price (in dollars per share)   $ 48        
Stock options outstanding, average life | year 0.1 0.1        
Stock options outstanding, intrinsic value   $ 0        
Stock options exercisable (in shares) | shares 0.1 0.1        
Stock options exercisable, average price (in dollars per option)   $ 48        
Stock options exercisable, intrinsic value   $ 0