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LOANS, FINANCING AND DEBENTURES - Breakdown by currency (Details) - BRL (R$) R$ in Thousands | Jun. 30, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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LOANS, FINANCING AND DEBENTURES |  |  |
Amount of borrowings outstanding intended to pay | R$ 80,628,577 | R$ 63,684,326 | R$ 35,737,509
Brazilian Reais |  |  |
LOANS, FINANCING AND DEBENTURES |  |  |
Amount of borrowings outstanding intended to pay | 16,751,206 | 18,170,261 |
USD |  |  |
LOANS, FINANCING AND DEBENTURES |  |  |
Amount of borrowings outstanding intended to pay | 63,817,265 | 45,460,138 |
Currency basket |  |  |
LOANS, FINANCING AND DEBENTURES |  |  |
Amount of borrowings outstanding intended to pay | R$ 60,106 | R$ 53,927 |

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