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FINANCIAL RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Changes in Fair Value of Derivatives (Details) - CAD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of detailed information about financial instruments [line items]    
Derivative financial assets, beginning of year $ 1,439,000,000 $ 1,500,000,000
Proceeds received from settlement of derivatives (8,166,000,000) (18,829,000,000)
Payment on derivatives settled 8,047,000,000 18,865,000,000
Increase (decrease) in fair value of derivatives (309,000,000) (97,000,000)
Derivative financial assets, end of year 1,011,000,000 1,439,000,000
Debt derivatives    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial assets, beginning of year 1,383,000,000  
Derivative financial liabilities, beginning of year (29,000,000)  
Proceeds received from settlement of derivatives (6,906,000,000) (17,620,000,000)
Payment on derivatives settled 6,826,000,000 17,630,000,000
Increase (decrease) in fair value of derivatives 97,000,000 (80,000,000)
Derivative financial assets, end of year 1,086,000,000 1,383,000,000
Derivative financial liabilities, end of year (12,000,000) (29,000,000)
Equity derivatives    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial assets, beginning of year 55,000,000 92,000,000
Proceeds received from settlement of derivatives 1,000,000 (15,000,000)
Payment on derivatives settled 0 0
Increase (decrease) in fair value of derivatives (22,000,000) (22,000,000)
Derivative financial assets, end of year 34,000,000 55,000,000
Cash flow hedges | Debt derivatives    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial assets, beginning of year 1,412,000,000 1,332,000,000
Proceeds received from settlement of derivatives 0 0
Payment on derivatives settled 0 0
Increase (decrease) in fair value of derivatives (314,000,000) 80,000,000
Derivative financial assets, end of year 1,098,000,000 1,412,000,000
Cash flow hedges | Bond forwards    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial liabilities, beginning of year 0 (87,000,000)
Proceeds received from settlement of derivatives   0
Payment on derivatives settled   111,000,000
Increase (decrease) in fair value of derivatives   (24,000,000)
Derivative financial liabilities, end of year 0 0
Cash flow hedges | Expenditure derivatives    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial assets, beginning of year 1,000,000 122,000,000
Proceeds received from settlement of derivatives (1,261,000,000) (1,194,000,000)
Payment on derivatives settled 1,221,000,000 1,124,000,000
Increase (decrease) in fair value of derivatives (70,000,000) (51,000,000)
Derivative financial assets, end of year   1,000,000
Derivative financial liabilities, end of year (109,000,000)  
Before Offset Amount    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial assets, beginning of year 1,579,000,000  
Derivative financial liabilities, beginning of year (140,000,000)  
Derivative financial assets, end of year 1,439,000,000 1,579,000,000
Derivative financial liabilities, end of year (428,000,000) (140,000,000)
Before Offset Amount | Debt derivatives    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial assets, beginning of year 0 41,000,000
Derivative financial liabilities, beginning of year (29,000,000)  
Derivative financial assets, end of year 0 0
Derivative financial liabilities, end of year (12,000,000) (29,000,000)
Before Offset Amount | Bond forwards    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial assets, beginning of year 0  
Derivative financial assets, end of year   0
Before Offset Amount | Equity derivatives    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial assets, beginning of year 55,000,000  
Derivative financial liabilities, beginning of year 0  
Derivative financial assets, end of year 34,000,000 55,000,000
Derivative financial liabilities, end of year 0 0
Before Offset Amount | Cash flow hedges | Debt derivatives    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial assets, beginning of year 1,508,000,000  
Derivative financial liabilities, beginning of year (96,000,000)  
Derivative financial assets, end of year 1,405,000,000 1,508,000,000
Derivative financial liabilities, end of year (307,000,000) (96,000,000)
Before Offset Amount | Cash flow hedges | Bond forwards    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial liabilities, beginning of year 0  
Derivative financial liabilities, end of year   0
Before Offset Amount | Cash flow hedges | Expenditure derivatives    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial assets, beginning of year 16,000,000  
Derivative financial liabilities, beginning of year (15,000,000)  
Derivative financial assets, end of year 0 16,000,000
Derivative financial liabilities, end of year $ (109,000,000) $ (15,000,000)