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LONG-TERM DEBT - Senior Notes and Debentures (Details)
 1 Months Ended 12 Months Ended
Nov. 12, 2019
CAD ($)
Apr. 30, 2019
CAD ($)
Feb. 08, 2018
CAD ($)
Nov. 30, 2019
CAD ($)
Nov. 30, 2019
USD ($)
Mar. 31, 2019
CAD ($)
Mar. 31, 2019
USD ($)
Apr. 30, 2018
CAD ($)
Apr. 30, 2018
USD ($)
Dec. 31, 2019
CAD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
CAD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2019
USD ($)
Nov. 12, 2019
USD ($)
Apr. 30, 2019
USD ($)
Apr. 30, 2018
USD ($)
Feb. 08, 2018
USD ($)
Disclosure of detailed information about borrowings [line items]                                    
Loss on repayment of long-term debt                   $ 19,000,000   $ 28,000,000            
Repayment of long-term debt               $ 1,500,000,000   (2,184,000,000)   823,000,000            
Debt derivatives                                    
Disclosure of detailed information about borrowings [line items]                                    
Total proceeds on debt derivatives               326,000,000   17,620,000,000   21,129,000,000            
Senior notes                                    
Disclosure of detailed information about borrowings [line items]                                    
Total gross proceeds                   3,984,000,000   938,000,000            
Repayment of long-term debt                   1,800,000,000   1,761,000,000            
Senior notes | Debt derivatives                                    
Disclosure of detailed information about borrowings [line items]                                    
Total proceeds on debt derivatives                   0   1,761,000,000            
Senior Notes Due 2029                                    
Disclosure of detailed information about borrowings [line items]                                    
Principal amount   $ 1,000,000,000                                
Interest rate   3.25%                           3.25%    
Discount / premium at issuance   99.746%                           99.746%    
Total gross proceeds   $ 1,000,000,000                                
Transaction costs and discounts   $ 7,000,000                                
Senior Notes Due 2029 | Fixed interest rate                                    
Disclosure of detailed information about borrowings [line items]                                    
Principal amount                   $ 1,000,000,000                
Interest rate                   3.25%       3.25%        
Senior Notes Due 2049 - 4.350%                                    
Disclosure of detailed information about borrowings [line items]                                    
Principal amount                               $ 1,250,000,000    
Interest rate   4.35%                           4.35%    
Discount / premium at issuance   99.667%                           99.667%    
Transaction costs and discounts   $ 20,000,000                                
Senior Notes Due 2049 - 4.350% | Fixed interest rate                                    
Disclosure of detailed information about borrowings [line items]                                    
Principal amount                           $ 1,250,000,000        
Interest rate                   4.35%       4.35%        
Senior Notes Due 2049 - 3.700%                                    
Disclosure of detailed information about borrowings [line items]                                    
Principal amount                             $ 1,000,000,000      
Interest rate                             3.70%      
Discount / premium at issuance                             98.926%      
Total gross proceeds $ 1,308,000,000                                  
Transaction costs and discounts $ 25,000,000                                  
Senior Notes Due 2049 - 3.700% | Fixed interest rate                                    
Disclosure of detailed information about borrowings [line items]                                    
Principal amount                           $ 1,000,000,000        
Interest rate                   3.70%       3.70%        
Senior Notes Due 2048                                    
Disclosure of detailed information about borrowings [line items]                                    
Principal amount                                   $ 750,000,000
Interest rate                                   4.30%
Discount / premium at issuance                                   99.398%
Transaction costs and discounts     $ 16,000,000                              
Senior Notes Due 2048 | Fixed interest rate                                    
Disclosure of detailed information about borrowings [line items]                                    
Principal amount                           $ 750,000,000        
Interest rate                   4.30%       4.30%        
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]                                    
Principal amount                   $ 900,000,000                
Interest rate       4.70%           4.70%       4.70%        
Senior Notes Due 2018                                    
Disclosure of detailed information about borrowings [line items]                                    
Principal amount               $ 1,800,000,000                 $ 1,400,000,000  
Senior Notes Due 2018 | Fixed interest rate                                    
Disclosure of detailed information about borrowings [line items]                                    
Interest rate               6.80%                 6.80%  
Senior Notes, US Portion                                    
Disclosure of detailed information about borrowings [line items]                                    
Principal amount                         $ 750,000,000 $ 2,250,000,000        
Total gross proceeds                   $ 2,984,000,000   938,000,000            
Repayment of long-term debt                   0 $ 0 1,761,000,000 $ 1,400,000,000          
Senior Notes, US Portion | March 2019                                    
Disclosure of detailed information about borrowings [line items]                                    
Repayment of long-term debt             $ 0                      
Senior Notes, US Portion | November 2019                                    
Disclosure of detailed information about borrowings [line items]                                    
Repayment of long-term debt         $ 0                          
Senior Notes, US Portion | September 2020, repaid November 2019                                    
Disclosure of detailed information about borrowings [line items]                                    
Repayment of long-term debt         $ 0                          
Senior Notes, US Portion | August 2018, repaid April 2018                                    
Disclosure of detailed information about borrowings [line items]                                    
Repayment of long-term debt                 $ 1,400,000,000                  
Senior Notes, Canadian Portion                                    
Disclosure of detailed information about borrowings [line items]                                    
Total gross proceeds                   1,000,000,000   0            
Repayment of long-term debt                   $ 1,800,000,000   $ 0            
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, Canadian Portion | August 2018, repaid April 2018                                    
Disclosure of detailed information about borrowings [line items]                                    
Repayment of long-term debt               $ 1,761,000,000