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BORROWINGS - Repayments on Non-Recourse Borrowings (Details) - Non-recourse borrowings (current and non-current) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure of detailed information about borrowings [line items]    
Borrowings $ 3,477 $ 3,526
Gross    
Disclosure of detailed information about borrowings [line items]    
Borrowings 3,486  
Deferred financing costs and other    
Disclosure of detailed information about borrowings [line items]    
Borrowings (9)  
2021 | Gross    
Disclosure of detailed information about borrowings [line items]    
Borrowings 12  
2022 | Gross    
Disclosure of detailed information about borrowings [line items]    
Borrowings 0  
2023 | Gross    
Disclosure of detailed information about borrowings [line items]    
Borrowings 1,335  
2024 | Gross    
Disclosure of detailed information about borrowings [line items]    
Borrowings 109  
2025 | Gross    
Disclosure of detailed information about borrowings [line items]    
Borrowings 157  
Thereafter | Gross    
Disclosure of detailed information about borrowings [line items]    
Borrowings $ 1,873