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BORROWINGS - Weighted Average Interest Rate (Details) - Interest on non-recourse borrowings - Weighted average
Dec. 31, 2020
Dec. 31, 2019
Disclosure of detailed information about borrowings [line items]    
Borrowings, interest rate 5.00% 5.00%
Utilities    
Disclosure of detailed information about borrowings [line items]    
Borrowings, interest rate 4.00% 5.00%
Transport    
Disclosure of detailed information about borrowings [line items]    
Borrowings, interest rate 5.00% 5.00%
Midstream    
Disclosure of detailed information about borrowings [line items]    
Borrowings, interest rate 6.00% 6.00%
Data    
Disclosure of detailed information about borrowings [line items]    
Borrowings, interest rate 6.00% 6.00%