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BORROWINGS - Narrative (Details)
$ in Millions
12 Months Ended
Dec. 31, 2020
USD ($)
Disclosure of detailed information about borrowings [line items]  
Increase (decrease) through financing cash flows, liabilities arising from financing activities $ 171
Non-recourse borrowings (current and non-current)  
Disclosure of detailed information about borrowings [line items]  
Decrease in borrowings $ (49)