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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 $ 1,551 $ 1,381
Non-current 18,469 17,163
Non-recourse borrowings    
Disclosure of detailed information about borrowings [line items]    
Total $ 20,020 $ 18,544