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BORROWINGS - Additional Information (Details)
$ in Millions, $ in Millions
 6 Months Ended
May 15, 2018
USD ($)
Jun. 30, 2018
USD ($)
extension
Dec. 31, 2017
USD ($)
Apr. 17, 2017
CAD ($)
Feb. 22, 2017
CAD ($)
Corporate revolving credit facility          
Disclosure of detailed information about borrowings [line items]          
Credit facility, maximum borrowing capacity   $ 1,975      
Subsidiary and corporate borrowings   0 $ 789    
Letter of credit outstanding amount   $ 59 106    
Corporate revolving credit facility | Floating interest rate          
Disclosure of detailed information about borrowings [line items]          
Borrowings, adjustment to interest rate basis   1.20%      
Medium-Term Notes, Public - Canadian - Maturing February 22, 2024          
Disclosure of detailed information about borrowings [line items]          
Subsidiary and corporate borrowings   $ 228 239    
Medium-Term Notes, Public - Canadian - Maturing February 22, 2024 | CAD          
Disclosure of detailed information about borrowings [line items]          
Face amount       $ 400 $ 300
Medium-Term Notes, Public - Canadian - Maturing February 22, 2024 | Fixed interest rate          
Disclosure of detailed information about borrowings [line items]          
Borrowings, interest rate   3.30%   3.30%  
Medium-Term Notes, Public - Canadian - Maturing February 22, 2024 | Fixed interest rate | CAD          
Disclosure of detailed information about borrowings [line items]          
Borrowings, interest rate       3.10%  
Medium-Term Notes, Public - Canadian - Maturing February 22, 2024 | Fixed interest rate | USD          
Disclosure of detailed information about borrowings [line items]          
Borrowings, interest rate       4.00% 4.10%
Medium Term Notes, Public - Canadian - Maturing February 22, 2024          
Disclosure of detailed information about borrowings [line items]          
Subsidiary and corporate borrowings   $ 305 318    
Medium Term Notes, Public - Canadian - Maturing February 22, 2024 | Fixed interest rate          
Disclosure of detailed information about borrowings [line items]          
Borrowings, interest rate   3.30%     3.30%
Revolving credit facility with Brookfield          
Disclosure of detailed information about borrowings [line items]          
Credit facility, maximum borrowing capacity   $ 500      
Subsidiary and corporate borrowings   $ 0 0    
Borrowings, number of extensions | extension   4      
Revolving credit facility with Brookfield | Floating interest rate          
Disclosure of detailed information about borrowings [line items]          
Borrowings, adjustment to interest rate basis   2.00%      
Commitment fees   $ 0      
Corporate borrowings          
Disclosure of detailed information about borrowings [line items]          
Subsidiary and corporate borrowings   1,256 2,101    
Increase (decrease) through effect of changes in foreign exchange rates, liabilities arising from financing activities   (56)      
Non-recourse borrowings          
Disclosure of detailed information about borrowings [line items]          
Subsidiary and corporate borrowings   9,689 $ 8,063    
Increase in borrowings   1,600      
Increase (decrease) through financing cash flows, liabilities arising from financing activities   $ 100      
Brazilian Regulated Gas Transmission Operation [Member] | Senior secured notes [Member]          
Disclosure of detailed information about borrowings [line items]          
Subsidiary and corporate borrowings $ 1,500        
Debt Instrument, Period Term 5 years        
Brazilian Regulated Gas Transmission Operation [Member] | Senior secured notes [Member] | Fixed interest rate          
Disclosure of detailed information about borrowings [line items]          
Borrowings, interest rate 7.10%