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BORROWINGS - Non-Recourse Borrowings (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about borrowings [line items]    
Current $ 1,381 $ 985
Non-current 17,163 12,128
Non-recourse borrowings    
Disclosure of detailed information about borrowings [line items]    
Total $ 18,544 $ 13,113