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STOCK-BASED COMPENSATION - Narrative (Details)
 12 Months Ended
Dec. 31, 2019
CAD ($)
shares
$ / shares
Dec. 31, 2018
CAD ($)
shares
$ / shares
Dec. 31, 2017
shares
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Liabilities from share-based payment transactions $ 220,000,000 $ 252,000,000  
Current liabilities from share-based payment transactions 173,000,000 186,000,000  
Non-current liabilities from share-based payment transactions 47,000,000 66,000,000  
Intrinsic value of liabilities from share-based payment transactions 106,000,000 112,000,000  
Expense from cash-settled share-based payment transactions $ 84,000,000 $ 69,000,000  
Weighted average exercise price of share options exercised in share-based payment arrangement (in dollars per share) | $ / shares $ 46.56 $ 45.20  
Unrecognized stock-based compensation expense, stock options $ 6,000,000 $ 8,000,000  
Stock-based compensation expense (recovery) $ 70,000,000 $ 65,000,000  
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 (in dollars per share) | $ / shares $ 70.97 $ 61.84  
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 expense (recovery) $ 1,000,000 $ 17,000,000  
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]      
Award vesting term 4 years    
Number of other equity instruments granted in share-based payment arrangement (in shares) | shares 0 439,435  
Number of other equity instruments outstanding in share-based payment arrangement (in shares) | shares 1,068,776 1,575,605  
Restricted share units      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Share conversion ratio 1    
Award vesting term 3 years    
Number of other equity instruments granted in share-based payment arrangement (in shares) | shares 1,013,900 1,217,487  
Number of other equity instruments outstanding in share-based payment arrangement (in shares) | shares 2,472,774 2,218,925 1,811,845
Unrecognized stock-based compensation expense, period of recognition 3 years    
Shares reserved for issue (in shares) | shares 4,000,000    
Unrecognized stock-based compensation expense, other than options (in shares) | shares 56,000,000 59,000,000  
Stock-based compensation expense (recovery) $ 47,000,000 $ 51,000,000  
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 180,896 263,239  
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%    
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 110,003 131,051  
Number of other equity instruments outstanding in share-based payment arrangement (in shares) | shares 1,741,884 2,004,440 2,327,647
Unrecognized stock-based compensation expense, period of recognition 3 years    
Unrecognized stock-based compensation expense, other than options (in shares) | shares 1,000,000 7,000,000  
Stock-based compensation expense (recovery) $ 4,000,000 $ 30,000,000  
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 29,300 40,269  
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%    
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 expense (recovery) $ 51,000,000 $ 46,000,000  
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 expense (recovery) $ 18,000,000 $ (33,000,000)