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BORROWINGS - Borrowings by Currency (Details) - Interest on non-recourse borrowings £ in Millions, R$ in Millions, $ in Millions | Dec. 31, 2020 USD ($) | Dec. 31, 2020 GBP (£) | Dec. 31, 2020 BRL (R$) | Dec. 31, 2019 USD ($) | Dec. 31, 2019 GBP (£) | Dec. 31, 2019 BRL (R$)
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Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Borrowings | $ 3,477 |  |  | $ 3,526 |  |
U.S. dollars |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Borrowings | 300 |  |  | 300 |  |
Local Currency | 300 |  |  | 300 |  |
British pounds |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Borrowings | 2,174 |  |  | 1,936 |  |
Local Currency | £ |  | £ 1,590 |  |  | £ 1,460 |
Brazilian real |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Borrowings | $ 1,012 |  |  | $ 1,290 |  |
Local Currency | R$ |  |  | R$ 5,260 |  |  | R$ 5,200

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