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14. FINANCIAL INSTRUMENTS (Details 19) - BRL (R$) R$ / shares in Units, R$ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Shareholder's equity (equity) | R$ 11,251,505 | R$ 11,361,932 | R$ 10,013,440 | R$ 8,288,229
Capital Management [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Shareholder's equity (equity) | 11,251,505 | 11,361,932 |  |
Borrowings and Financing (Third-party capital) | R$ 35,270,653 | R$ 27,967,036 |  |
Gross Debit/Shareholder's equity | R$ 3.13 | R$ 2.46 |  |

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