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STOCK-BASED COMPENSATION - Narrative (Details)
 12 Months Ended
Dec. 31, 2020
CAD ($)
shares
$ / shares
Dec. 31, 2019
CAD ($)
shares
$ / shares
Dec. 31, 2018
shares
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Liabilities from share-based payment transactions $ 204,000,000 $ 220,000,000  
Current liabilities from share-based payment transactions 165,000,000 173,000,000  
Non-current liabilities from share-based payment transactions 39,000,000 47,000,000  
Intrinsic value of liabilities from share-based payment transactions 103,000,000 106,000,000  
Expense from cash-settled share-based payment transactions $ 60,000,000 $ 84,000,000  
Weighted average exercise price of share options exercised in share-based payment arrangement (in dollars per share) | $ / shares $ 54.80 $ 46.56  
Unrecognized stock-based compensation expense, stock options $ 5,000,000 $ 6,000,000  
Stock-based compensation expense (recovery) $ 60,000,000 $ 70,000,000  
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 0 0  
Award vesting term 4 years    
Number of other equity instruments outstanding in share-based payment arrangement (in shares) | shares 1,068,776 1,068,776  
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 $ 60.00 $ 70.97  
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) $ 1,000,000  
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    
Restricted share units      
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 1,026,067 1,013,900  
Share conversion ratio 1    
Award vesting term 3 years    
Number of other equity instruments outstanding in share-based payment arrangement (in shares) | shares 2,573,894 2,472,774 2,218,925
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 50,000,000 56,000,000  
Stock-based compensation expense (recovery) $ 49,000,000 $ 47,000,000  
Performance-based RSUs      
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 219,493 180,896  
Award vesting term 3 years    
Performance-based RSUs | Minimum      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Performance vesting rights 30.00%    
Performance-based RSUs | Maximum      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Performance vesting rights 170.00%    
Deferred share units      
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 80,252 110,003  
Award vesting term 3 years    
Number of other equity instruments outstanding in share-based payment arrangement (in shares) | shares 1,619,941 1,741,884 2,004,440
Unrecognized stock-based compensation expense, period of recognition 3 years    
Unrecognized stock-based compensation expense, other than options (in shares) | shares 0 1,000,000  
Stock-based compensation expense (recovery) $ (3,000,000) $ 4,000,000  
Performance-based DSUs      
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 10,513 29,300  
Award vesting term 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%    
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 $ 51,000,000  
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) $ 15,000,000 $ 18,000,000