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12. FINANCIAL INSTRUMENTS (Details 16) - BRL (R$) R$ / shares in Units, R$ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Shareholder's equity (equity) | R$ 11,361,932 | R$ 10,013,440 | R$ 8,288,229 | R$ 7,384,521
Capital Management [Member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Shareholder's equity (equity) | 11,361,932 | 10,013,440 |  |
Borrowings and Financing (Third-party capital) | R$ 27,967,036 | R$ 28,827,074 |  |
Gross Debit/Shareholder's equity | R$ 2.46 | R$ 2.88 |  |

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