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INCOME AND SOCIAL CONTRIBUTION TAXES - Estimated recovery and reversal of income and social contributions tax assets and liabilities (Details) - BRL (R$) R$ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
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Deferred income and social contribution tax assets and liabilities at statutory tax rates |  |  |  |
Non-current assets | R$ 3,393,354 | R$ 4,071,219 | R$ 3,874,054 | R$ 3,054,393
Non-current liabilities | (61,562) | (517,413) | R$ (118,368) | R$ (82,686)
2020 |  |  |  |
Deferred income and social contribution tax assets and liabilities at statutory tax rates |  |  |  |
Non-current assets |  | 605,657 |  |
2021 |  |  |  |
Deferred income and social contribution tax assets and liabilities at statutory tax rates |  |  |  |
Non-current assets | 616,409 | 467,153 |  |
Non-current liabilities | (8,558) | (98,449) |  |
2022 |  |  |  |
Deferred income and social contribution tax assets and liabilities at statutory tax rates |  |  |  |
Non-current assets | 399,248 | 422,863 |  |
Non-current liabilities | (8,192) | (110,031) |  |
2023 |  |  |  |
Deferred income and social contribution tax assets and liabilities at statutory tax rates |  |  |  |
Non-current assets | 391,610 | 464,514 |  |
Non-current liabilities | (14,815) | (90,703) |  |
2024 |  |  |  |
Deferred income and social contribution tax assets and liabilities at statutory tax rates |  |  |  |
Non-current assets | 348,139 | 472,734 |  |
Non-current liabilities | (3,145) | (79,022) |  |
2025 and after |  |  |  |
Deferred income and social contribution tax assets and liabilities at statutory tax rates |  |  |  |
Non-current assets | 1,637,948 | 1,638,298 |  |
Non-current liabilities | R$ (26,852) | R$ (139,208) |  |

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- Definition The amounts of income taxes recoverable in future periods in respect of: (a) deductible temporary differences; (b) the carryforward of unused tax losses; and (c) the carryforward of unused tax credits. [Refer: Temporary differences [member]; Unused tax credits [member]; Unused tax losses [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2020-01-01 -Paragraph 81 -Subparagraph g -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2020-en-r&anchor=para_81_g_i&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 54 -Subparagraph o -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_54_o&doctype=Standard -URIDate 2020-01-01 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 56 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_56&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amounts of income taxes payable in future periods in respect of taxable temporary differences. [Refer: Temporary differences [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2020-01-01 -Paragraph 81 -Subparagraph g -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2020-en-r&anchor=para_81_g_i&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 54 -Subparagraph o -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_54_o&doctype=Standard -URIDate 2020-01-01 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 56 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_56&doctype=Standard -URIDate 2020-01-01 + Details
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