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FINANCIAL RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Derivative Instruments - Net Asset (Liability) Position (Details)
$ in Millions, $ in Millions
Dec. 31, 2023
CAD ($)
$ / $
Dec. 31, 2023
USD ($)
$ / $
Dec. 31, 2022
CAD ($)
$ / $
Dec. 31, 2022
USD ($)
$ / $
Dec. 31, 2021
CAD ($)
Disclosure of detailed information about hedging instruments [line items]          
Fair value, assets $ (538)   $ 1,136   $ 895
Current portion of derivative instruments 80   689    
Derivative instruments 571   861    
Net mark-to-market asset (538)   1,136    
Net mark-to-market asset (54)   673    
Net mark-to-market asset (484)   463    
Derivative instruments (1,055)   (398)    
Debt derivatives          
Disclosure of detailed information about hedging instruments [line items]          
Notional amount, assets     $ 1,517 $ 1,173  
Exchange rate, assets | $ / $     1.2930 1.2930  
Fair value, assets $ (571)   $ 988    
Exchange rate, liabilities | $ / $ 1.3526 1.3526      
Derivative financial liabilities $ 101   (72)    
Notional amount, liabilities 4,537 $ 3,354      
Current portion of derivative instruments (98)   525    
Derivative instruments (473)   463    
Debt derivatives | Cash flow hedges          
Disclosure of detailed information about hedging instruments [line items]          
Notional amount, assets $ 5,278 $ 4,557 $ 9,180 $ 7,834  
Exchange rate, assets | $ / $ 1.1583 1.1583 1.1718 1.1718  
Fair value, assets $ (470)   $ 916   1,110
Notional amount, liabilities $ 13,773 $ 10,550 $ 9,738 $ 7,491  
Exchange rate, liabilities | $ / $ 1.3055 1.3055 1.3000 1.3000  
Interest rate derivatives          
Disclosure of detailed information about hedging instruments [line items]          
Derivative financial liabilities     $ 0    
Interest rate derivatives | Cash flow hedges          
Disclosure of detailed information about hedging instruments [line items]          
Fair value, assets     0    
Expenditure derivatives | Cash flow hedges          
Disclosure of detailed information about hedging instruments [line items]          
Notional amount, assets $ 789 $ 600 $ 1,200 $ 960  
Exchange rate, assets | $ / $ 1.3147 1.3147 1.2500 1.2500  
Fair value, assets     $ 94   (19)
Notional amount, liabilities $ 1,398 $ 1,050      
Exchange rate, liabilities | $ / $ 1.3315 1.3315      
Derivative financial liabilities $ 15   94    
Current portion of derivative instruments     94    
Current derivative financial liabilities (4)        
Derivative instruments     0    
Derivative instruments (11)        
Equity derivatives          
Disclosure of detailed information about hedging instruments [line items]          
Notional amount, assets 324   295    
Fair value, assets 48   54   36
Current portion of derivative instruments 48        
Derivative instruments 0        
Before Offset Amount          
Disclosure of detailed information about hedging instruments [line items]          
Fair value, assets 651   1,550    
Derivative financial liabilities 1,189   414    
Before Offset Amount | Debt derivatives          
Disclosure of detailed information about hedging instruments [line items]          
Fair value, assets 0   72    
Derivative financial liabilities 101   0   $ 11
Current portion of derivative instruments     72    
Current derivative financial liabilities (101)        
Derivative instruments     0    
Derivative instruments 0        
Before Offset Amount | Debt derivatives | Cash flow hedges          
Disclosure of detailed information about hedging instruments [line items]          
Fair value, assets 599   1,330    
Derivative financial liabilities 1,069   414    
Current portion of derivative instruments 29   469    
Current derivative financial liabilities (26)   (16)    
Derivative instruments 570   861    
Derivative instruments (1,043)   (398)    
Before Offset Amount | Interest rate derivatives          
Disclosure of detailed information about hedging instruments [line items]          
Derivative financial liabilities     0    
Before Offset Amount | Interest rate derivatives | Cash flow hedges          
Disclosure of detailed information about hedging instruments [line items]          
Fair value, assets     0    
Derivative financial liabilities     243    
Before Offset Amount | Expenditure derivatives | Cash flow hedges          
Disclosure of detailed information about hedging instruments [line items]          
Fair value, assets 4   94    
Derivative financial liabilities 19   0    
Current portion of derivative instruments 3   94    
Current derivative financial liabilities (7)        
Derivative instruments 1   0    
Derivative instruments (12)        
Before Offset Amount | Equity derivatives          
Disclosure of detailed information about hedging instruments [line items]          
Fair value, assets 48   54    
Derivative financial liabilities 0   0    
Current portion of derivative instruments 48   54    
Derivative instruments $ 0   $ 0