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BORROWINGS - Additional Information (Details)
$ in Millions, $ in Millions
 6 Months Ended
Nov. 06, 2019
CAD ($)
Jun. 30, 2020
USD ($)
extension
Apr. 07, 2020
CAD ($)
Dec. 31, 2019
USD ($)
Oct. 07, 2019
CAD ($)
Sep. 10, 2018
CAD ($)
Corporate revolving credit facility            
Disclosure of detailed information about borrowings [line items]            
Credit facility, maximum borrowing capacity   $ 1,975        
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage   13        
Subsidiary and corporate borrowings   $ 1,210   $ 820    
Letter of credit outstanding amount   55   54    
Increase (decrease) in corporate borrowings   $ 390        
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 September 11, 2028 [Domain]            
Disclosure of detailed information about borrowings [line items]            
Subsidiary and corporate borrowings   $ 516   384    
Medium-term Notes, Maturing September 11, 2028 [Domain] | Fixed interest rate            
Disclosure of detailed information about borrowings [line items]            
Borrowings, interest rate   4.20%        
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        
Commitment fees   $ 0        
Revolving credit facility with Brookfield | Floating interest rate            
Disclosure of detailed information about borrowings [line items]            
Borrowings, adjustment to interest rate basis   1.80%        
Non-recourse borrowings            
Disclosure of detailed information about borrowings [line items]            
Subsidiary and corporate borrowings   $ 17,860   18,544    
Increase in borrowings   (700)        
Proceeds from non-current borrowings   200        
Syndicated Revolving Credit Facility [Member]            
Disclosure of detailed information about borrowings [line items]            
Credit facility, maximum borrowing capacity   $ 1,000        
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage   42        
Subsidiary and corporate borrowings   $ 0   0    
Syndicated Revolving Credit Facility [Member] | Floating interest rate            
Disclosure of detailed information about borrowings [line items]            
Borrowings, adjustment to interest rate basis   2.10%        
Medium-term Notes, Maturing October 9, 2029 [Domain]            
Disclosure of detailed information about borrowings [line items]            
Subsidiary and corporate borrowings   $ 516   $ 386    
Medium-term Notes, Maturing October 9, 2029 [Domain] | Fixed interest rate            
Disclosure of detailed information about borrowings [line items]            
Borrowings, interest rate   3.40%        
Brookfield Infrastructure Finance ULC, Brookfield Infrastructure Finance LLC, Brookfield Infrastructure Finance Pty Ltd and Brookfield Infrastructure Finance Limited (Debt Issuers) [Member] | Medium-term Notes, Maturing September 11, 2028 [Domain]            
Disclosure of detailed information about borrowings [line items]            
Notional amount     $ 200     $ 500
Brookfield Infrastructure Finance ULC, Brookfield Infrastructure Finance LLC, Brookfield Infrastructure Finance Pty Ltd and Brookfield Infrastructure Finance Limited (Debt Issuers) [Member] | Medium-term Notes, Maturing September 11, 2028 [Domain] | Fixed interest rate | Canada, Dollars            
Disclosure of detailed information about borrowings [line items]            
Borrowings, interest rate     4.20%     4.20%
Borrowings, Effective Interest Rate     4.10%      
Brookfield Infrastructure Finance ULC, Brookfield Infrastructure Finance LLC, Brookfield Infrastructure Finance Pty Ltd and Brookfield Infrastructure Finance Limited (Debt Issuers) [Member] | Medium-term Notes, Maturing September 11, 2028 and October 9, 2029, Combined [Domain] [Member]            
Disclosure of detailed information about borrowings [line items]            
Notional amount     $ 400      
Brookfield Infrastructure Finance ULC, Brookfield Infrastructure Finance LLC, Brookfield Infrastructure Finance Pty Ltd and Brookfield Infrastructure Finance Limited (Debt Issuers) [Member] | Medium-term Notes, Maturing October 9, 2029 [Domain]            
Disclosure of detailed information about borrowings [line items]            
Notional amount     $ 200   $ 500  
Brookfield Infrastructure Finance ULC, Brookfield Infrastructure Finance LLC, Brookfield Infrastructure Finance Pty Ltd and Brookfield Infrastructure Finance Limited (Debt Issuers) [Member] | Medium-term Notes, Maturing October 9, 2029 [Domain] | Fixed interest rate | Canada, Dollars            
Disclosure of detailed information about borrowings [line items]            
Borrowings, interest rate     3.40%   3.40%  
Borrowings, Effective Interest Rate     4.10%      
Brookfield Infrastructure Finance ULC, Brookfield Infrastructure Finance LLC, Brookfield Infrastructure Finance Pty Ltd and Brookfield Infrastructure Finance Limited (Debt Issuers) [Member] | Medium Term Notes, Maturing October 30, 2020 [Member]            
Disclosure of detailed information about borrowings [line items]            
Extinguishment of Debt, Amount $ 375          
Pro Forma [Member] | Syndicated Revolving Credit Facility [Member]            
Disclosure of detailed information about borrowings [line items]            
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage   44        
Pro Forma [Member] | Syndicated Revolving Credit Facility [Member] | Floating interest rate            
Disclosure of detailed information about borrowings [line items]            
Borrowings, adjustment to interest rate basis   2.20%