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BORROWINGS - Non-Recourse Borrowings (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure of detailed information about borrowings [line items]    
Current $ 11 $ 0
Non-current 3,466 3,526
Non-recourse borrowings (current and non-current)    
Disclosure of detailed information about borrowings [line items]    
Total $ 3,477 $ 3,526