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11. INCOME AND SOCIAL CONTRIBUTION TAXES (Details 3) - BRL (R$)
R$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Future Taxable Profits Enable Deferred Tax Assets [line items]    
Deferred tax assets future taxable profits R$ 4,028 R$ 3,471
2020 [Member]    
Disclosure Of Future Taxable Profits Enable Deferred Tax Assets [line items]    
Deferred tax assets future taxable profits 659  
2021 [Member]    
Disclosure Of Future Taxable Profits Enable Deferred Tax Assets [line items]    
Deferred tax assets future taxable profits 571  
2024 [Member]    
Disclosure Of Future Taxable Profits Enable Deferred Tax Assets [line items]    
Deferred tax assets future taxable profits 571  
2022 [Member]    
Disclosure Of Future Taxable Profits Enable Deferred Tax Assets [line items]    
Deferred tax assets future taxable profits 572  
2023 [Member]    
Disclosure Of Future Taxable Profits Enable Deferred Tax Assets [line items]    
Deferred tax assets future taxable profits 571  
2025 To 2027 [Member]    
Disclosure Of Future Taxable Profits Enable Deferred Tax Assets [line items]    
Deferred tax assets future taxable profits 659  
2028 To 2029 [Member]    
Disclosure Of Future Taxable Profits Enable Deferred Tax Assets [line items]    
Deferred tax assets future taxable profits R$ 425