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LONG-TERM DEBT - Senior Notes and Debentures (Details)
$ in Millions, $ in Millions
 1 Months Ended 12 Months Ended
Nov. 04, 2016
CAD ($)
Apr. 30, 2018
CAD ($)
Apr. 30, 2018
USD ($)
Jun. 30, 2017
CAD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
CAD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2018
CAD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
CAD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
Feb. 08, 2018
Disclosure of detailed information about borrowings [line items]                          
Loss on repayment of long-term debt $ 16                        
Repayment of long-term debt   $ 1,500           $ 823   $ 1,034      
Senior notes                          
Disclosure of detailed information about borrowings [line items]                          
Principal amount                     $ 0 $ 750  
Proceeds on issuance of long-term debt               938   0      
Repayment of long-term debt               1,761   750      
Senior Notes Due 2018                          
Disclosure of detailed information about borrowings [line items]                          
Principal amount               1,800       1,400  
Senior Notes Due 2026                          
Disclosure of detailed information about borrowings [line items]                          
Principal amount                       750  
Interest rate                         4.30%
Discount / premium at issuance 99.398%                        
Senior Notes, US Portion                          
Disclosure of detailed information about borrowings [line items]                          
Repayment of long-term debt     $ 1,400   $ 0   $ 0 1,761 $ 1,400 0 $ 0    
Senior Notes, Canadian Portion                          
Disclosure of detailed information about borrowings [line items]                          
Repayment of long-term debt   1,761   $ 500   $ 250   $ 0   750      
Fixed interest rate | Senior Notes Due 2018                          
Disclosure of detailed information about borrowings [line items]                          
Principal amount                       $ 1,400  
Interest rate               6.80%       6.80%  
Fixed interest rate | Senior Notes Due 2026                          
Disclosure of detailed information about borrowings [line items]                          
Principal amount                       $ 500  
Interest rate               2.90%       2.90% 4.193%
Fixed interest rate | Senior Notes Due 2048                          
Disclosure of detailed information about borrowings [line items]                          
Principal amount                       $ 750  
Interest rate               4.30%       4.30%  
Debt derivatives                          
Disclosure of detailed information about borrowings [line items]                          
Total proceeds on debt derivatives   $ 326                      
Debt derivatives | Senior notes                          
Disclosure of detailed information about borrowings [line items]                          
Total proceeds on debt derivatives               $ 1,761   $ 0