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FINANCIAL RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Derivative Instruments - Net Asset (Liability) Position (Details)
$ in Millions, $ in Millions
Dec. 31, 2022
CAD ($)
$ / $
Dec. 31, 2022
USD ($)
$ / $
Dec. 31, 2021
CAD ($)
$ / $
Dec. 31, 2021
USD ($)
$ / $
Dec. 31, 2020
CAD ($)
Disclosure of detailed information about hedging instruments [line items]          
Fair value, assets $ 1,136   $ 895   $ 1,011
Current portion of derivative instruments 689   120    
Derivative instruments 861   1,431    
Net mark-to-market asset (liability) 1,136   895    
Net mark-to-market asset (liability) 673   (347)    
Net mark-to-market asset (liability) 463   1,242    
Derivative instruments (398)   (189)    
Debt derivatives          
Disclosure of detailed information about hedging instruments [line items]          
Notional amount, assets $ 1,517 $ 1,173 $ 1,389 $ 1,104  
Exchange rate, assets | $ / $ 1.2930 1.2930 1.2578 1.2578  
Fair value, assets $ 988   $ 1,121    
Derivative financial liabilities (72)   (11)    
Current portion of derivative instruments 525   (117)    
Derivative instruments 463   1,238    
Debt derivatives | Cash flow hedges          
Disclosure of detailed information about hedging instruments [line items]          
Notional amount, assets $ 9,180 $ 7,834 $ 6,661 $ 5,859  
Exchange rate, assets | $ / $ 1.1718 1.1718 1.1369 1.1369  
Fair value, assets $ 916   $ 1,110   1,098
Notional amount, liabilities $ 9,738 $ 7,491 $ 7,011 $ 5,383  
Exchange rate, liabilities | $ / $ 1.3000 1.3000 1.3025 1.3025  
Interest rate derivatives          
Disclosure of detailed information about hedging instruments [line items]          
Derivative financial liabilities $ 0   $ 243    
Current derivative financial liabilities     (243)    
Derivative instruments     0    
Interest rate derivatives | Cash flow hedges          
Disclosure of detailed information about hedging instruments [line items]          
Notional amount, assets     3,250    
Derivative financial liabilities 0   243   0
Interest rate derivatives | Cash flow hedges | United States of America, Dollars          
Disclosure of detailed information about hedging instruments [line items]          
Notional amount, assets       $ 2,000  
Interest rate derivatives | Cash flow hedges | Canada, Dollars          
Disclosure of detailed information about hedging instruments [line items]          
Notional amount, liabilities     500    
Expenditure derivatives | Cash flow hedges          
Disclosure of detailed information about hedging instruments [line items]          
Notional amount, assets $ 1,200 $ 960 $ 545 $ 438  
Exchange rate, assets | $ / $ 1.2500 1.2500 1.2453 1.2453  
Fair value, assets     $ (19)   (109)
Notional amount, liabilities     $ 829 $ 630  
Exchange rate, liabilities | $ / $     1.3151 1.3151  
Derivative financial liabilities $ (94)   $ (19)    
Current portion of derivative instruments     (23)    
Current derivative financial liabilities 94        
Derivative instruments     4    
Derivative instruments 0        
Equity derivatives          
Disclosure of detailed information about hedging instruments [line items]          
Notional amount, assets 295   265    
Fair value, assets 54   36   34
Current portion of derivative instruments 54        
Derivative instruments 0        
Before Offset Amount          
Disclosure of detailed information about hedging instruments [line items]          
Fair value, assets 1,550   1,551    
Derivative financial liabilities 414   656    
Before Offset Amount | Debt derivatives          
Disclosure of detailed information about hedging instruments [line items]          
Fair value, assets (72)   11   $ (12)
Derivative financial liabilities 0   0    
Current portion of derivative instruments (72)   11    
Derivative instruments 0   0    
Before Offset Amount | Debt derivatives | Cash flow hedges          
Disclosure of detailed information about hedging instruments [line items]          
Fair value, assets 1,330   1,453    
Derivative financial liabilities 414   343    
Current portion of derivative instruments 469   26    
Current derivative financial liabilities (16)   (154)    
Derivative instruments 861   1,427    
Derivative instruments (398)   (189)    
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   40    
Derivative financial liabilities     283    
Current portion of derivative instruments     40    
Derivative instruments     0    
Before Offset Amount | Interest rate derivatives | Cash flow hedges | United States of America, Dollars          
Disclosure of detailed information about hedging instruments [line items]          
Derivative financial liabilities     277    
Current derivative financial liabilities     (277)    
Derivative instruments     0    
Before Offset Amount | Interest rate derivatives | Cash flow hedges | Canada, Dollars          
Disclosure of detailed information about hedging instruments [line items]          
Derivative financial liabilities     (6)    
Current derivative financial liabilities     (6)    
Derivative instruments     0    
Before Offset Amount | Expenditure derivatives | Cash flow hedges          
Disclosure of detailed information about hedging instruments [line items]          
Fair value, assets 94   11    
Derivative financial liabilities 0   30    
Current portion of derivative instruments 94   7    
Current derivative financial liabilities     (30)    
Derivative instruments 0   4    
Derivative instruments     0    
Before Offset Amount | Equity derivatives          
Disclosure of detailed information about hedging instruments [line items]          
Fair value, assets 54   36    
Derivative financial liabilities 0   0    
Current portion of derivative instruments 54   36    
Derivative instruments $ 0   $ 0