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10. DEFERRED INCOME TAXES (Details 2)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
BRL (R$)
DisclosureOfDeferredIncomeTaxesLineItems [Line Items]  
Deferred tax R$ 2,833,129
2021 [member]  
DisclosureOfDeferredIncomeTaxesLineItems [Line Items]  
Deferred tax 55,306
2022 [member]  
DisclosureOfDeferredIncomeTaxesLineItems [Line Items]  
Deferred tax 140,612
2023 [member]  
DisclosureOfDeferredIncomeTaxesLineItems [Line Items]  
Deferred tax 231,408
2024 [member]  
DisclosureOfDeferredIncomeTaxesLineItems [Line Items]  
Deferred tax 291,677
2025 [member]  
DisclosureOfDeferredIncomeTaxesLineItems [Line Items]  
Deferred tax 335,681
2026 to 2028 [member]  
DisclosureOfDeferredIncomeTaxesLineItems [Line Items]  
Deferred tax 1,035,323
2029 onwards [member]  
DisclosureOfDeferredIncomeTaxesLineItems [Line Items]  
Deferred tax R$ 743,122