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10. INCOME AND SOCIAL CONTRIBUTION TAXES (Details 4) - BRL (R$) R$ in Millions |  | 12 Months Ended
--- | --- | ---
Jan. 02, 2019 | [1] | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
DisclosureOfIncomeAndSocialContributionTaxesLineItems [Line Items] |  |  |  |  |  |
Profit before income tax and social contribution tax |  | R$ 3,800 |  |  |  |
Income tax and social contribution tax - nominal expense (34%) |  | (1,292) |  |  |  |
Tax effects applicable to: |  |  |  |  |  |
Gain (loss) in subsidiaries by equity method |  | 93 |  |  |  |
Interest on Equity |  | 188 |  |  |  |
Non-deductible contributions and donations |  | (10) |  |  |  |
Tax incentives |  | 39 |  |  |  |
Effects from subsidiaries taxed based on gross revenues |  | 97 |  |  |  |
Non-deductible penalties |  | (25) |  |  |  |
Impairment of accounts receivable from related parties |  | (13) |  |  |  |
Others |  | (13) |  |  |  |
Income tax and social contribution tax - effective expense |  | (936) | R$ (1,599) |  | R$ (610) |
Current tax |  | (684) |  |  |  |
Deferred tax |  | (252) |  |  |  |
Income tax and social contribution tax - effective expense |  | R$ 936 | 1,599 |  | 610 |
Effective rate |  | 24.63% |  |  |  |
Restated [member] |  |  |  |  |  |
DisclosureOfIncomeAndSocialContributionTaxesLineItems [Line Items] |  |  |  |  |  |
Profit before income tax and social contribution tax |  |  | 4,570 |  | 2,011 |
Income tax and social contribution tax - nominal expense (34%) |  |  | (1,554) |  | (683) |
Tax effects applicable to: |  |  |  |  |  |
Gain (loss) in subsidiaries by equity method |  |  | 8 |  | (61) |
Interest on Equity |  |  | 136 |  | 71 |
Non-deductible contributions and donations |  |  | (13) |  | (6) |
Tax incentives |  |  | 66 |  | 29 |
Effects from subsidiaries taxed based on gross revenues |  |  | 89 |  | 89 |
Non-deductible penalties |  |  | (135) |  | (12) |
Impairment of accounts receivable from related parties |  |  | (234) |  |  |
Others |  |  | 38 |  | (37) |
Income tax and social contribution tax - effective expense |  |  | (1,599) |  | (610) |
Current tax | R$ (583) |  | (1,454) | [2] | (583) | [2]
Deferred tax | R$ (27) |  | (145) | [2],[3] | (27) | [2]
Income tax and social contribution tax - effective expense |  |  | R$ 1,599 |  | R$ 610 |
Effective rate |  |  | 35.00% |  | 30.33% |
[1] | See note 2.8.
[2] | For further details of restatement of comparative balances, see Note 2.8
[3] | The basic and diluted earnings per share for the years ended in December 31, 2019 and 2018 were also adjusted retrospectively in order to reflect the increase in the number of shares in 2021. For more information, see Note 26.

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