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BORROWINGS - Additional Information (Details)
$ in Millions
 12 Months Ended
Oct. 30, 2018
USD ($)
Oct. 30, 2018
CAD ($)
May 15, 2018
USD ($)
Dec. 31, 2018
USD ($)
extension
Sep. 10, 2018
USD ($)
Sep. 10, 2018
CAD ($)
Dec. 31, 2017
USD ($)
Apr. 17, 2017
CAD ($)
Feb. 22, 2017
CAD ($)
Disclosure of detailed information about borrowings [line items]                  
Letter of credit outstanding amount       $ 47,000,000     $ 106,000,000    
Increase (decrease) in corporate borrowings       (108,000,000)          
Corporate revolving credit facility                  
Disclosure of detailed information about borrowings [line items]                  
Credit facility, maximum borrowing capacity       1,975,000,000.000          
Non-recourse borrowings       510,000,000     789,000,000    
Increase (decrease) in corporate borrowings       $ (279,000,000)          
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage       0.18%          
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, Maturing October 30, 2018                  
Disclosure of detailed information about borrowings [line items]                  
Non-recourse borrowings       $ 0     99,000,000    
Medium Term Notes, Maturing October 30, 2018 | Debt Issuers                  
Disclosure of detailed information about borrowings [line items]                  
Amount repaid   $ 125              
Medium Term Notes, Maturing October 30, 2018 | Debt Issuers | USD                  
Disclosure of detailed information about borrowings [line items]                  
Amount repaid $ 94,000,000                
Medium Term Notes, Maturing October 30, 2018 | Fixed interest rate                  
Disclosure of detailed information about borrowings [line items]                  
Borrowings, interest rate       3.00%          
Medium-term Notes, Maturing September 11, 2028 [Domain]                  
Disclosure of detailed information about borrowings [line items]                  
Non-recourse borrowings       $ 365,000,000     0    
Face amount           $ 500      
Medium-term Notes, Maturing September 11, 2028 [Domain] | USD                  
Disclosure of detailed information about borrowings [line items]                  
Face amount         $ 377,000,000        
Medium-term Notes, Maturing September 11, 2028 [Domain] | Fixed interest rate                  
Disclosure of detailed information about borrowings [line items]                  
Borrowings, interest rate       4.20% 4.20% 4.20%      
Medium-term Notes, Maturing September 11, 2028 [Domain] | Fixed interest rate | USD                  
Disclosure of detailed information about borrowings [line items]                  
Borrowings, interest rate         4.70% 4.70%      
Medium-term notes, maturing February 22, 2024                  
Disclosure of detailed information about borrowings [line items]                  
Non-recourse borrowings       $ 220,000,000     239,000,000    
Face amount               $ 400 $ 300
Medium-term notes, maturing February 22, 2024 | Debt Issuers                  
Disclosure of detailed information about borrowings [line items]                  
Face amount                 $ 300
Medium-term notes, maturing February 22, 2024 | Fixed interest rate                  
Disclosure of detailed information about borrowings [line items]                  
Borrowings, interest rate       3.30%       3.30% 3.30%
Medium-term notes, maturing February 22, 2024 | Fixed interest rate | CAD                  
Disclosure of detailed information about borrowings [line items]                  
Borrowings, interest rate               3.10%  
Medium-term notes, 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, maturing February 22, 2024 | Fixed interest rate | Debt Issuers | CAD                  
Disclosure of detailed information about borrowings [line items]                  
Borrowings, interest rate                 3.30%
Medium-term notes, maturing February 22, 2024 | Fixed interest rate | Debt Issuers | USD                  
Disclosure of detailed information about borrowings [line items]                  
Borrowings, interest rate                 4.10%
Non-recourse borrowings                  
Disclosure of detailed information about borrowings [line items]                  
Non-recourse borrowings       $ 13,113,000,000     8,063,000,000    
Increase in borrowings       5,100,000,000          
Increase (decrease) through financing cash flows, liabilities arising from financing activities       4,000,000,000          
Non-recourse borrowings | CAD                  
Disclosure of detailed information about borrowings [line items]                  
Non-recourse borrowings       1,388,000,000     397,000,000    
Non-recourse borrowings | USD                  
Disclosure of detailed information about borrowings [line items]                  
Non-recourse borrowings       5,317,000,000     3,087,000,000    
Revolving credit facility with Brookfield                  
Disclosure of detailed information about borrowings [line items]                  
Credit facility, maximum borrowing capacity       $ 500,000,000          
Borrowings, number of extensions | extension       4          
Non-recourse borrowings       $ 0     $ 0    
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          
Senior secured notes | Brazilian regulated gas transmission operation                  
Disclosure of detailed information about borrowings [line items]                  
Non-recourse borrowings     $ 1,500,000,000            
Debt Instrument, Period Term     5 years