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FINANCIAL RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Financial Instruments at Fair Value (Details) - CAD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about financial instruments [line items]      
Investments in publicly traded companies $ 1,831 $ 1,051  
Derivative financial assets 1,439 1,500 $ 1,094
Total financial assets 3,410 2,660  
Total financial liabilities 140 109  
Long-term debt (including current portion) 15,967 14,290 14,448
Debt derivatives      
Disclosure of detailed information about financial instruments [line items]      
Derivative financial assets 1,383 1,373  
Equity derivatives      
Disclosure of detailed information about financial instruments [line items]      
Derivative financial assets 55 92 68
Cash flow hedges | Debt derivatives      
Disclosure of detailed information about financial instruments [line items]      
Derivative financial assets 1,412 1,332 $ 1,152
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) 18,354 15,110  
Fair value (Level 1) | Fair value      
Disclosure of detailed information about financial instruments [line items]      
Investments in publicly traded companies 1,831 1,051  
Total financial assets 1,831 1,051  
Total financial liabilities 0 0  
Fair value (Level 1) | Fair value | 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 | 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 | Bond forwards      
Disclosure of detailed information about financial instruments [line items]      
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 1,579 1,609  
Total financial liabilities 140 109  
Fair value (Level 2) | Fair value | Debt derivatives      
Disclosure of detailed information about financial instruments [line items]      
Derivative financial assets 0 41  
Derivative financial liabilities 29 0  
Fair value (Level 2) | Fair value | Equity derivatives      
Disclosure of detailed information about financial instruments [line items]      
Derivative financial assets 55 92  
Fair value (Level 2) | Fair value | Cash flow hedges | Debt derivatives      
Disclosure of detailed information about financial instruments [line items]      
Derivative financial assets 1,508 1,354  
Derivative financial liabilities 96 22  
Fair value (Level 2) | Fair value | Cash flow hedges | Bond forwards      
Disclosure of detailed information about financial instruments [line items]      
Derivative financial liabilities 0 87  
Fair value (Level 2) | Fair value | Cash flow hedges | Expenditure derivatives      
Disclosure of detailed information about financial instruments [line items]      
Derivative financial assets 16 122  
Derivative financial liabilities 15 0  
Before Offset Amount      
Disclosure of detailed information about financial instruments [line items]      
Derivative financial assets 1,579 1,609  
Before Offset Amount | Debt derivatives      
Disclosure of detailed information about financial instruments [line items]      
Derivative financial assets 0 41  
Derivative financial liabilities 29 0  
Before Offset Amount | Equity derivatives      
Disclosure of detailed information about financial instruments [line items]      
Derivative financial assets 55 92  
Before Offset Amount | Cash flow hedges | Debt derivatives      
Disclosure of detailed information about financial instruments [line items]      
Derivative financial assets 1,508 1,354  
Derivative financial liabilities 96 22  
Before Offset Amount | Cash flow hedges | Bond forwards      
Disclosure of detailed information about financial instruments [line items]      
Derivative financial liabilities 0 87  
Before Offset Amount | Cash flow hedges | Expenditure derivatives      
Disclosure of detailed information about financial instruments [line items]      
Derivative financial assets 16 122  
Derivative financial liabilities $ 15 $ 0