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LONG-TERM DEBT - Long-Term Debt Activity (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2020
CAD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
CAD ($)
Dec. 31, 2019
USD ($)
Disclosure of detailed information about borrowings [line items]        
Repayment of long-term debt $ 2,540,000,000   $ 2,184,000,000  
Net issuance of long-term debt 2,540,000,000   2,184,000,000  
Long-term debt net of transaction costs, beginning of year 15,967,000,000   14,290,000,000  
Net issuance of long-term debt 2,540,000,000   2,184,000,000  
Gain on foreign exchange (297,000,000)   (458,000,000)  
Deferred transaction costs incurred (23,000,000)   (61,000,000)  
Amortization of deferred transaction costs 14,000,000   12,000,000  
Long-term debt net of transaction costs, end of year 18,201,000,000   15,967,000,000  
Bank credit facilities        
Disclosure of detailed information about borrowings [line items]        
Net issuance of long-term debt 21,000,000   0  
Net issuance of long-term debt 21,000,000   0  
Bank Credit Facilities, US Portion        
Disclosure of detailed information about borrowings [line items]        
Proceeds on issuance of long-term debt $ 1,385,000,000 $ 970 $ 0 $ 0
Exchange rate on proceeds from non-current borrowings 1.428 1.428 0 0
Repayment of long-term debt $ (1,364,000,000) $ (970) $ 0 $ 0
Exchange rate on repayments of non-current borrowings 1.406 1.406 0 0
Senior notes        
Disclosure of detailed information about borrowings [line items]        
Proceeds on issuance of long-term debt $ 2,519,000,000   $ 3,984,000,000  
Net issuance of long-term debt 2,519,000,000   2,184,000,000  
Net issuance of long-term debt 2,519,000,000   2,184,000,000  
Senior Notes, Canadian Portion        
Disclosure of detailed information about borrowings [line items]        
Proceeds on issuance of long-term debt 1,500,000,000   1,000,000,000  
Repayment of long-term debt 0   (1,800,000,000)  
Senior Notes, US Portion        
Disclosure of detailed information about borrowings [line items]        
Proceeds on issuance of long-term debt $ 1,019,000,000   $ 2,984,000,000  
Exchange rate on proceeds from non-current borrowings 1.359 1.359 1.326 1.326
Principal amount   $ 750   $ 2,250