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FINANCIAL RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Derivative Instruments - Net Asset (Liability) Position (Details)
$ in Millions
Dec. 31, 2019
CAD ($)
$ / $
Dec. 31, 2019
USD ($)
$ / $
Dec. 31, 2018
CAD ($)
$ / $
Dec. 31, 2018
USD ($)
$ / $
Dec. 31, 2017
CAD ($)
Disclosure of detailed information about hedging instruments [line items]          
Derivative financial assets $ 1,439,000,000   $ 1,500,000,000   $ 1,094,000,000
Debt derivatives          
Disclosure of detailed information about hedging instruments [line items]          
Notional amount, assets     $ 1,564,000,000 $ 1,178  
Exchange rate, assets | $ / $     1.3276 1.3276  
Derivative financial assets 1,383,000,000   $ 1,373,000,000    
Notional amount, liabilities $ 1,618,000,000 $ 1,223      
Exchange rate, liabilities | $ / $ 1.3227 1.3227      
Derivative financial liabilities $ (29,000,000)       (23,000,000)
Debt derivatives | Cash flow hedges          
Disclosure of detailed information about hedging instruments [line items]          
Notional amount, assets $ 6,587,000,000 $ 5,800 $ 6,184,000,000 $ 5,500  
Exchange rate, assets | $ / $ 1.1357 1.1357 1.1243 1.1243  
Derivative financial assets $ 1,412,000,000   $ 1,332,000,000   1,152,000,000
Notional amount, liabilities $ 3,409,000,000 $ 2,570 $ 736,000,000 $ 550  
Exchange rate, liabilities | $ / $ 1.3263 1.3263 1.3389 1.3389  
Bond forwards | Cash flow hedges          
Disclosure of detailed information about hedging instruments [line items]          
Notional amount, liabilities     $ 900,000,000    
Derivative financial liabilities $ 0   (87,000,000)   (64,000,000)
Expenditure derivatives | Cash flow hedges          
Disclosure of detailed information about hedging instruments [line items]          
Notional amount, assets $ 335,000,000 $ 270 $ 1,341,000,000 $ 1,080  
Exchange rate, assets | $ / $ 1.2391 1.2391 1.2413 1.2413  
Derivative financial assets $ 1,000,000   $ 122,000,000    
Notional amount, liabilities $ 952,000,000 $ 720      
Exchange rate, liabilities | $ / $ 1.3228 1.3228      
Derivative financial liabilities         (39,000,000)
Equity derivatives          
Disclosure of detailed information about hedging instruments [line items]          
Notional amount, assets $ 223,000,000   258,000,000    
Derivative financial assets 55,000,000   92,000,000   $ 68,000,000
Before Offset Amount          
Disclosure of detailed information about hedging instruments [line items]          
Derivative financial assets 1,579,000,000   1,609,000,000    
Derivative financial liabilities (140,000,000)   (109,000,000)    
Before Offset Amount | Debt derivatives          
Disclosure of detailed information about hedging instruments [line items]          
Derivative financial assets 0   41,000,000    
Derivative financial liabilities (29,000,000)        
Before Offset Amount | Debt derivatives | Cash flow hedges          
Disclosure of detailed information about hedging instruments [line items]          
Derivative financial assets 1,508,000,000   1,354,000,000    
Derivative financial liabilities (96,000,000)   (22,000,000)    
Before Offset Amount | Bond forwards | Cash flow hedges          
Disclosure of detailed information about hedging instruments [line items]          
Derivative financial liabilities 0   (87,000,000)    
Before Offset Amount | Expenditure derivatives | Cash flow hedges          
Disclosure of detailed information about hedging instruments [line items]          
Derivative financial assets 16,000,000   122,000,000    
Derivative financial liabilities (15,000,000)        
Before Offset Amount | Equity derivatives          
Disclosure of detailed information about hedging instruments [line items]          
Derivative financial assets $ 55,000,000   $ 92,000,000