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BORROWINGS - Supplemental Cash Flows (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of reconciliation of liabilities arising from financing activities [abstract]    
Cash Flows $ 171  
Non-recourse borrowings (current and non-current)    
Disclosure of reconciliation of liabilities arising from financing activities [abstract]    
Beginning balance 3,526 $ 3,246
Cash Flows 171 261
Foreign Exchange Movement (220) 19
Ending balance $ 3,477 $ 3,526