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STOCK-BASED COMPENSATION - Narrative (Details)
 12 Months Ended
Dec. 31, 2022
CAD ($)
shares
$ / shares
Dec. 31, 2021
CAD ($)
shares
$ / shares
Dec. 31, 2020
shares
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Liabilities from share-based payment transactions $ 229,000,000 $ 199,000,000  
Current liabilities from share-based payment transactions 169,000,000 150,000,000  
Non-current liabilities from share-based payment transactions 60,000,000 49,000,000  
Intrinsic value of liabilities from share-based payment transactions 85,000,000 95,000,000  
Expense from cash-settled share-based payment transactions $ 72,000,000 $ 76,000,000  
Weighted average exercise price of share options exercised in share-based payment arrangement (in dollars per share) | $ / shares $ 50.87 $ 58.45  
Unrecognized stock-based compensation expense, stock options $ 14,000,000 $ 11,000,000  
Stock-based compensation expense (recovery) $ 67,000,000 $ 60,000,000  
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 2,469,014 2,469,014  
Award vesting term (in years) 4 years    
Number of other equity instruments outstanding in share-based payment arrangement (in shares) | shares 3,159,161 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 $ 65.44 $ 57.52  
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 (in years) 4 years    
Grant exercise price determination term 5 days    
Unrecognized stock-based compensation expense, period of recognition (in years) 4 years    
Stock-based compensation expense (recovery) $ 28,000,000 $ 3,000,000  
Stock options | Minimum      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Award term (in years) 7 years    
Stock options | Maximum      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Award term (in years) 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 990,702 1,341,801  
Share conversion ratio 1    
Award vesting term (in years) 3 years    
Number of other equity instruments outstanding in share-based payment arrangement (in shares) | shares 2,402,489 2,691,288 2,573,894
Unrecognized stock-based compensation expense, period of recognition (in years) 3 years    
Shares reserved for issue (in shares) | shares 4,000,000    
Unrecognized stock-based compensation expense, other than options (in shares) | shares 48,000,000 64,000,000  
Stock-based compensation expense (recovery) $ 51,000,000 $ 57,000,000  
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 206,719 295,958  
Award vesting term (in years) 3 years    
Performance-based RSUs | Minimum      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Performance vesting rights 0.00%    
Performance-based RSUs | Maximum      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Performance vesting rights 100.00%    
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 70,692 78,939  
Award vesting term (in years) 3 years    
Number of other equity instruments outstanding in share-based payment arrangement (in shares) | shares 1,139,884 1,421,342 1,619,941
Unrecognized stock-based compensation expense, other than options (in shares) | shares 0 0  
Stock-based compensation expense (recovery) $ 9,000,000 $ 6,000,000  
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 6,934 7,517  
Employee Share Accumulation Plan      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Maximum employee contribution percentage 15.00%    
Amount of maximum annual employee contribution $ 25,000    
Stock-based compensation expense (recovery) $ 55,000,000 $ 52,000,000  
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) $ (21,000,000) $ (6,000,000)