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BORROWINGS - Supplemental Cash Flows (Details)
$ in Millions
12 Months Ended
Dec. 31, 2018
USD ($)
Corporate borrowings  
Disclosure of reconciliation of liabilities arising from financing activities [abstract]  
Beginning Balance $ 2,101
Cash Flows 4
Acquisition 0
Foreign Exchange Movement (112)
Ending Balance 1,993
Non-recourse borrowings  
Disclosure of reconciliation of liabilities arising from financing activities [abstract]  
Beginning Balance 8,063
Cash Flows 3,951
Acquisition 1,484
Foreign Exchange Movement (385)
Ending Balance $ 13,113