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LONG-TERM DEBT - Senior Notes and Debentures (Details)
 1 Months Ended 12 Months Ended
Jun. 22, 2020
CAD ($)
Mar. 31, 2020
CAD ($)
Nov. 12, 2019
CAD ($)
Apr. 30, 2019
CAD ($)
Nov. 30, 2019
CAD ($)
Mar. 31, 2019
CAD ($)
Dec. 31, 2020
CAD ($)
Dec. 31, 2019
CAD ($)
Dec. 31, 2020
USD ($)
Jun. 22, 2020
USD ($)
Dec. 31, 2019
USD ($)
Nov. 12, 2019
USD ($)
Apr. 30, 2019
USD ($)
Disclosure of detailed information about borrowings [line items]                          
Repayment of long-term debt             $ (2,540,000,000) $ (2,184,000,000)          
Loss on repayment of long-term debt             0 19,000,000          
Senior notes                          
Disclosure of detailed information about borrowings [line items]                          
Total gross proceeds             2,519,000,000 3,984,000,000          
Senior Notes Due 2027 | Fixed interest rate                          
Disclosure of detailed information about borrowings [line items]                          
Principal amount   $ 1,500,000,000         $ 1,500,000,000            
Interest rate   3.65%         3.65%   3.65%        
Discount / premium at issuance   99.511%                      
Total gross proceeds   $ 1,500,000,000                      
Transaction costs and discounts   $ 16,000,000                      
Senior Notes Due 2022 | Fixed interest rate                          
Disclosure of detailed information about borrowings [line items]                          
Principal amount             $ 600,000,000            
Interest rate             4.00%   4.00%        
Senior Notes Due 2022 | Floating interest rate                          
Disclosure of detailed information about borrowings [line items]                          
Principal amount                 $ 750,000,000 $ 750,000,000      
Spread on variable rate                   0.60%      
Discount / premium at issuance                   100.00%      
Total gross proceeds $ 1,019,000,000                        
Transaction costs and discounts $ 5,000,000                        
Senior Notes Due 2049 - 4.350% | Fixed interest rate                          
Disclosure of detailed information about borrowings [line items]                          
Principal amount                 $ 1,250,000,000   $ 1,250,000,000   $ 1,250,000,000
Interest rate             4.35%   4.35%       4.35%
Discount / premium at issuance                         99.667%
Total gross proceeds       $ 1,676,000,000                  
Transaction costs and discounts       $ 20,000,000                  
Senior Notes Due 2049 - 3.700% | Fixed interest rate                          
Disclosure of detailed information about borrowings [line items]                          
Principal amount                 $ 1,000,000,000   $ 1,000,000,000 $ 1,000,000,000  
Interest rate             3.70%   3.70%     3.70%  
Discount / premium at issuance                       98.926%  
Total gross proceeds     $ 1,308,000,000                    
Transaction costs and discounts     $ 25,000,000                    
Senior Notes, Canadian Portion                          
Disclosure of detailed information about borrowings [line items]                          
Total gross proceeds             $ 1,500,000,000 1,000,000,000          
Repayment of long-term debt             $ 0 $ 1,800,000,000          
Senior Notes, Canadian Portion | March 2019                          
Disclosure of detailed information about borrowings [line items]                          
Repayment of long-term debt           $ 400,000,000              
Senior Notes, Canadian Portion | November 2019                          
Disclosure of detailed information about borrowings [line items]                          
Repayment of long-term debt         $ 500,000,000                
Senior Notes, Canadian Portion | September 2020, repaid November 2019                          
Disclosure of detailed information about borrowings [line items]                          
Repayment of long-term debt         900,000,000                
Senior Notes Due 2020                          
Disclosure of detailed information about borrowings [line items]                          
Principal amount         $ 900,000,000                
Senior Notes Due 2020 | Fixed interest rate                          
Disclosure of detailed information about borrowings [line items]                          
Interest rate         4.70%