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STOCK-BASED COMPENSATION - Narrative (Details)
12 Months Ended
Dec. 31, 2018
CAD ($)
shares
Dec. 31, 2017
CAD ($)
shares
Dec. 31, 2016
shares
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Liabilities from share-based payment transactions $ 252,000,000 $ 223,000,000  
Current liabilities from share-based payment transactions 186,000,000 157,000,000  
Non-current liabilities from share-based payment transactions 66,000,000 66,000,000  
Intrinsic value of liabilities from share-based payment transactions 112,000,000 69,000,000  
Expense from cash-settled share-based payment transactions 69,000,000 107,000,000  
Weighted average exercise price of share options exercised in share-based payment arrangement 45.20 42.10  
Unrecognized stock-based compensation expense, stock options 8,000,000 6,000,000  
Stock-based compensation 65,000,000 61,000,000  
Cash-settled stock options      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Weighted average exercise price of share options exercised in share-based payment arrangement $ 61.84 59.68  
Stock options      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Share conversion ratio 1    
Awards authorized (in shares) | shares 65,000,000    
Award vesting term 4 years    
Grant exercise price determination term 5 days    
Unrecognized stock-based compensation expense, period of recognition 4 years    
Stock-based compensation $ 17,000,000 $ 33,000,000  
Stock options | Minimum      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Award term 7 years    
Stock options | Maximum      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Award term 10 years    
Performance Options      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Number of other equity instruments granted in share-based payment arrangement (in shares) | shares 439,435 489,835  
Number of other equity instruments outstanding in share-based payment arrangement (in shares) | shares 1,575,605 1,540,158  
Performance-based RSUs      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Award vesting term 3 years    
Number of other equity instruments granted in share-based payment arrangement (in shares) | shares 263,239 133,559  
Unrecognized stock-based compensation expense, period of recognition 3 years    
Performance-based RSUs | Minimum      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Performance vesting rights 50.00%    
Performance-based RSUs | Maximum      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Performance vesting rights 150.00%    
Restricted share units      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Share conversion ratio 1    
Award vesting term 3 years    
Common Stock, Capital Shares Reserved for Future Issuance | shares 4,000,000    
Number of other equity instruments granted in share-based payment arrangement (in shares) | shares 1,217,487 826,081  
Number of other equity instruments outstanding in share-based payment arrangement (in shares) | shares 2,218,925.000000 1,811,845.000000 2,237,085
Unrecognized stock-based compensation expense, other than options | shares 59,000,000 41,000,000  
Stock-based compensation $ 51,000,000 $ 51,000,000  
Performance-based DSUs      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Award vesting term 3 years    
Number of other equity instruments granted in share-based payment arrangement (in shares) | shares 40,269 191,875  
Unrecognized stock-based compensation expense, period of recognition 3 years    
Performance-based DSUs | Minimum      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Performance vesting rights 50.00%    
Performance-based DSUs | Maximum      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Performance vesting rights 150.00%    
Deferred share units      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Award vesting term 3 years    
Number of other equity instruments granted in share-based payment arrangement (in shares) | shares 131,051 735,117  
Number of other equity instruments outstanding in share-based payment arrangement (in shares) | shares 2,004,440.00000 2,327,647.000000 2,396,458
Unrecognized stock-based compensation expense, other than options | shares 7,000,000 22,000,000  
Stock-based compensation $ 30,000,000 $ 51,000,000  
Employee Share Accumulation Plan      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Maximum employee contribution percentage 10.00%    
Amount of maximum annual employee contribution $ 25,000    
Stock-based compensation $ 46,000,000 43,000,000  
Employee Share Accumulation Plan | Minimum      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Employer percentage, matching contribution 25.00%    
Employee Share Accumulation Plan | Maximum      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Employer percentage, matching contribution 50.00%    
Equity derivatives      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Stock-based compensation $ (33,000,000) $ (74,000,000)