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11 BORROWINGS, FINANCING AND DEBENTURES (Details 2) - BRL (R$) R$ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Disclosure of detailed information about borrowings [line items] |  |
Long-term liabilities | R$ 22,841,193 | R$ 23,173,635
2021 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Long-term liabilities | 3,576,306 |
2022 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Long-term liabilities | 3,311,843 |
2023 [Member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Long-term liabilities | 7,378,252 |
2024 [Member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Long-term liabilities | 1,640,183 |
After 2025 [Member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Long-term liabilities | 2,932,590 |
Perpetual Bonds [Member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Long-term liabilities | 4,030,700 |
2025 [Member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Long-term liabilities | 68,595 |
Bank Loans [Member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Long-term liabilities | 10,105,678 |
Bank Loans [Member] | 2021 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Long-term liabilities | 2,884,003 |
Bank Loans [Member] | 2022 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Long-term liabilities | 2,700,341 |
Bank Loans [Member] | 2023 [Member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Long-term liabilities | 2,945,897 |
Bank Loans [Member] | 2024 [Member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Long-term liabilities | 1,575,437 |
Capital Markets [Member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Long-term liabilities | 12,020,851 |
Capital Markets [Member] | 2021 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Long-term liabilities | 636,667 |
Capital Markets [Member] | 2022 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Long-term liabilities | 556,666 |
Capital Markets [Member] | 2023 [Member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Long-term liabilities | 4,378,398 |
Capital Markets [Member] | After 2025 [Member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Long-term liabilities | 2,418,420 |
Capital Markets [Member] | Perpetual Bonds [Member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Long-term liabilities | 4,030,700 |
Development Agencies [Member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Long-term liabilities | 811,940 |
Development Agencies [Member] | 2021 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Long-term liabilities | 55,636 |
Development Agencies [Member] | 2022 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Long-term liabilities | 54,836 |
Development Agencies [Member] | 2023 [Member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Long-term liabilities | 53,957 |
Development Agencies [Member] | 2024 [Member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Long-term liabilities | 64,746 |
Development Agencies [Member] | After 2025 [Member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Long-term liabilities | 514,170 |
Development Agencies [Member] | 2025 [Member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Long-term liabilities | R$ 68,595 |

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