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BORROWINGS - Non-Recourse Borrowings (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Disclosure of detailed information about borrowings [line items]    
Current Non-recourse Borrowings And Current Portion of Non-current Non-recourse Borrowings $ 1,453 $ 1,381
Non-current Portion Of Non-current Non-recourse Borrowings 16,407 17,163
Non-recourse borrowings    
Disclosure of detailed information about borrowings [line items]    
Total $ 17,860 $ 18,544