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FINANCIAL RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Financial Instruments at Fair Value (Details) - CAD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about financial instruments [line items]      
Investments in publicly traded companies $ 1,535 $ 1,831  
Derivative financial assets 1,011 1,439 $ 1,500
Total financial assets 2,974 3,410  
Total financial liabilities 428 140  
Long-term debt (including current portion) 18,201 15,967 14,290
Debt derivatives      
Disclosure of detailed information about financial instruments [line items]      
Derivative financial assets 1,086 1,383  
Equity derivatives      
Disclosure of detailed information about financial instruments [line items]      
Derivative financial assets 34 55 92
Cash flow hedges | Debt derivatives      
Disclosure of detailed information about financial instruments [line items]      
Derivative financial assets 1,098 1,412 1,332
Cash flow hedges | Expenditure derivatives      
Disclosure of detailed information about financial instruments [line items]      
Derivative financial assets   1 122
Fair value      
Disclosure of detailed information about financial instruments [line items]      
Long-term debt (including current portion) 22,006 18,354  
Fair value (Level 1) | Fair value      
Disclosure of detailed information about financial instruments [line items]      
Investments in publicly traded companies 1,535 1,831  
Total financial assets 1,535 1,831  
Total financial liabilities 0 0  
Fair value (Level 1) | Fair value | Debt derivatives      
Disclosure of detailed information about financial instruments [line items]      
Derivative financial liabilities 0 0  
Fair value (Level 1) | Fair value | Equity derivatives      
Disclosure of detailed information about financial instruments [line items]      
Derivative financial assets 0 0  
Fair value (Level 1) | Fair value | Cash flow hedges | Debt derivatives      
Disclosure of detailed information about financial instruments [line items]      
Derivative financial assets 0 0  
Derivative financial liabilities 0 0  
Fair value (Level 1) | Fair value | Cash flow hedges | Expenditure derivatives      
Disclosure of detailed information about financial instruments [line items]      
Derivative financial assets 0 0  
Derivative financial liabilities 0 0  
Fair value (Level 2) | Fair value      
Disclosure of detailed information about financial instruments [line items]      
Investments in publicly traded companies 0 0  
Total financial assets 1,439 1,579  
Total financial liabilities 428 140  
Fair value (Level 2) | Fair value | Debt derivatives      
Disclosure of detailed information about financial instruments [line items]      
Derivative financial liabilities 12 29  
Fair value (Level 2) | Fair value | Equity derivatives      
Disclosure of detailed information about financial instruments [line items]      
Derivative financial assets 34 55  
Fair value (Level 2) | Fair value | Cash flow hedges | Debt derivatives      
Disclosure of detailed information about financial instruments [line items]      
Derivative financial assets 1,405 1,508  
Derivative financial liabilities 307 96  
Fair value (Level 2) | Fair value | Cash flow hedges | Expenditure derivatives      
Disclosure of detailed information about financial instruments [line items]      
Derivative financial assets 0 16  
Derivative financial liabilities 109 15  
Before Offset Amount      
Disclosure of detailed information about financial instruments [line items]      
Derivative financial assets 1,439 1,579  
Before Offset Amount | Debt derivatives      
Disclosure of detailed information about financial instruments [line items]      
Derivative financial assets 0 0 $ 41
Derivative financial liabilities 12 29  
Before Offset Amount | Equity derivatives      
Disclosure of detailed information about financial instruments [line items]      
Derivative financial assets 34 55  
Before Offset Amount | Cash flow hedges | Debt derivatives      
Disclosure of detailed information about financial instruments [line items]      
Derivative financial assets 1,405 1,508  
Derivative financial liabilities 307 96  
Before Offset Amount | Cash flow hedges | Expenditure derivatives      
Disclosure of detailed information about financial instruments [line items]      
Derivative financial assets 0 16  
Derivative financial liabilities $ 109 $ 15