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BORROWINGS - Non-Recourse Borrowings (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Disclosure of detailed information about borrowings [line items]    
Current Non-recourse Borrowings And Current Portion Of Non-current Non-recourse Borrowings $ 12 $ 11
Non-current Portion Of Non-current Non-recourse Borrowings 3,728 3,466
Non-recourse borrowings    
Disclosure of detailed information about borrowings [line items]    
Borrowings $ 3,740 $ 3,477