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23. FINANCIAL INSTRUMENTS AND RISK MANAGEMENT (Details 1) - BRL (R$)
R$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
DisclosureOfFinancialInstrumentsAndRisksManagementLineItems [Line Items]    
Book value R$ 727 R$ 3
Liquidity risk [member]    
DisclosureOfFinancialInstrumentsAndRisksManagementLineItems [Line Items]    
Book value (727)  
Liquidity risk [member] | Loans and borrowings [member]    
DisclosureOfFinancialInstrumentsAndRisksManagementLineItems [Line Items]    
Book value 22,404,426  
Cash flow contracted 34,310,033  
Liquidity risk [member] | Loans and borrowings [member] | 2021 [member]    
DisclosureOfFinancialInstrumentsAndRisksManagementLineItems [Line Items]    
Book value 1,731,718  
Liquidity risk [member] | Loans and borrowings [member] | 2022 [member]    
DisclosureOfFinancialInstrumentsAndRisksManagementLineItems [Line Items]    
Book value 3,405,806  
Liquidity risk [member] | Loans and borrowings [member] | 2023 [member]    
DisclosureOfFinancialInstrumentsAndRisksManagementLineItems [Line Items]    
Book value 3,491,994  
Liquidity risk [member] | Loans and borrowings [member] | 2024 [member]    
DisclosureOfFinancialInstrumentsAndRisksManagementLineItems [Line Items]    
Book value 2,668,153  
Liquidity risk [member] | Loans and borrowings [member] | 2025 [member]    
DisclosureOfFinancialInstrumentsAndRisksManagementLineItems [Line Items]    
Book value 1,418,320  
Liquidity risk [member] | Loans and borrowings [member] | 2026 onwards [member]    
DisclosureOfFinancialInstrumentsAndRisksManagementLineItems [Line Items]    
Book value 21,594,042  
Liquidity risk [member] | Trade accounts payable [member]    
DisclosureOfFinancialInstrumentsAndRisksManagementLineItems [Line Items]    
Book value 9,009,987  
Cash flow contracted 9,098,376  
Liquidity risk [member] | Trade accounts payable [member] | 2021 [member]    
DisclosureOfFinancialInstrumentsAndRisksManagementLineItems [Line Items]    
Book value 9,084,595  
Liquidity risk [member] | Trade accounts payable [member] | 2022 [member]    
DisclosureOfFinancialInstrumentsAndRisksManagementLineItems [Line Items]    
Book value 5,499  
Liquidity risk [member] | Trade accounts payable [member] | 2023 [member]    
DisclosureOfFinancialInstrumentsAndRisksManagementLineItems [Line Items]    
Book value 5,433  
Liquidity risk [member] | Trade accounts payable [member] | 2024 [member]    
DisclosureOfFinancialInstrumentsAndRisksManagementLineItems [Line Items]    
Book value 2,849  
Liquidity risk [member] | Trade accounts payable [member] | 2025 [member]    
DisclosureOfFinancialInstrumentsAndRisksManagementLineItems [Line Items]    
Book value  
Liquidity risk [member] | Trade accounts payable [member] | 2026 onwards [member]    
DisclosureOfFinancialInstrumentsAndRisksManagementLineItems [Line Items]    
Book value  
Liquidity risk [member] | Supply chain finance [member]    
DisclosureOfFinancialInstrumentsAndRisksManagementLineItems [Line Items]    
Book value 1,452,637  
Cash flow contracted 1,474,227  
Liquidity risk [member] | Supply chain finance [member] | 2021 [member]    
DisclosureOfFinancialInstrumentsAndRisksManagementLineItems [Line Items]    
Book value 1,474,227  
Liquidity risk [member] | Supply chain finance [member] | 2022 [member]    
DisclosureOfFinancialInstrumentsAndRisksManagementLineItems [Line Items]    
Book value  
Liquidity risk [member] | Supply chain finance [member] | 2023 [member]    
DisclosureOfFinancialInstrumentsAndRisksManagementLineItems [Line Items]    
Book value  
Liquidity risk [member] | Supply chain finance [member] | 2024 [member]    
DisclosureOfFinancialInstrumentsAndRisksManagementLineItems [Line Items]    
Book value  
Liquidity risk [member] | Supply chain finance [member] | 2025 [member]    
DisclosureOfFinancialInstrumentsAndRisksManagementLineItems [Line Items]    
Book value  
Liquidity risk [member] | Supply chain finance [member] | 2026 onwards [member]    
DisclosureOfFinancialInstrumentsAndRisksManagementLineItems [Line Items]    
Book value  
Liquidity risk [member] | Lease liabilities [member]    
DisclosureOfFinancialInstrumentsAndRisksManagementLineItems [Line Items]    
Book value 2,536,681  
Cash flow contracted 3,277,861  
Liquidity risk [member] | Lease liabilities [member] | 2021 [member]    
DisclosureOfFinancialInstrumentsAndRisksManagementLineItems [Line Items]    
Book value 409,409  
Liquidity risk [member] | Lease liabilities [member] | 2022 [member]    
DisclosureOfFinancialInstrumentsAndRisksManagementLineItems [Line Items]    
Book value 542,947  
Liquidity risk [member] | Lease liabilities [member] | 2023 [member]    
DisclosureOfFinancialInstrumentsAndRisksManagementLineItems [Line Items]    
Book value 448,295  
Liquidity risk [member] | Lease liabilities [member] | 2024 [member]    
DisclosureOfFinancialInstrumentsAndRisksManagementLineItems [Line Items]    
Book value 377,710  
Liquidity risk [member] | Lease liabilities [member] | 2025 [member]    
DisclosureOfFinancialInstrumentsAndRisksManagementLineItems [Line Items]    
Book value 283,917  
Liquidity risk [member] | Lease liabilities [member] | 2026 onwards [member]    
DisclosureOfFinancialInstrumentsAndRisksManagementLineItems [Line Items]    
Book value 1,215,583  
Liquidity risk [member] | Currency derivatives (NDF) [member] | Designated as cash flow hedge [member]    
DisclosureOfFinancialInstrumentsAndRisksManagementLineItems [Line Items]    
Book value 81,650  
Cash flow contracted 81,650  
Liquidity risk [member] | Currency derivatives (NDF) [member] | 2021 [member] | Designated as cash flow hedge [member]    
DisclosureOfFinancialInstrumentsAndRisksManagementLineItems [Line Items]    
Book value 81,650  
Liquidity risk [member] | Currency derivatives (NDF) [member] | 2022 [member] | Designated as cash flow hedge [member]    
DisclosureOfFinancialInstrumentsAndRisksManagementLineItems [Line Items]    
Book value  
Liquidity risk [member] | Currency derivatives (NDF) [member] | 2022 [member] | Non-designated as cash flow hedge [member]    
DisclosureOfFinancialInstrumentsAndRisksManagementLineItems [Line Items]    
Book value  
Liquidity risk [member] | Currency derivatives (NDF) [member] | 2023 [member] | Designated as cash flow hedge [member]    
DisclosureOfFinancialInstrumentsAndRisksManagementLineItems [Line Items]    
Book value  
Liquidity risk [member] | Currency derivatives (NDF) [member] | 2023 [member] | Non-designated as cash flow hedge [member]    
DisclosureOfFinancialInstrumentsAndRisksManagementLineItems [Line Items]    
Book value  
Liquidity risk [member] | Currency derivatives (NDF) [member] | 2024 [member] | Designated as cash flow hedge [member]    
DisclosureOfFinancialInstrumentsAndRisksManagementLineItems [Line Items]    
Book value  
Liquidity risk [member] | Currency derivatives (NDF) [member] | 2024 [member] | Non-designated as cash flow hedge [member]    
DisclosureOfFinancialInstrumentsAndRisksManagementLineItems [Line Items]    
Book value  
Liquidity risk [member] | Currency derivatives (NDF) [member] | 2025 [member] | Designated as cash flow hedge [member]    
DisclosureOfFinancialInstrumentsAndRisksManagementLineItems [Line Items]    
Book value  
Liquidity risk [member] | Currency derivatives (NDF) [member] | 2025 [member] | Non-designated as cash flow hedge [member]    
DisclosureOfFinancialInstrumentsAndRisksManagementLineItems [Line Items]    
Book value  
Liquidity risk [member] | Currency derivatives (NDF) [member] | 2026 onwards [member] | Designated as cash flow hedge [member]    
DisclosureOfFinancialInstrumentsAndRisksManagementLineItems [Line Items]    
Book value  
Liquidity risk [member] | Currency derivatives (NDF) [member] | 2026 onwards [member] | Non-designated as cash flow hedge [member]    
DisclosureOfFinancialInstrumentsAndRisksManagementLineItems [Line Items]    
Book value  
Liquidity risk [member] | Commodities derivatives [member] | Designated as cash flow hedge [member]    
DisclosureOfFinancialInstrumentsAndRisksManagementLineItems [Line Items]    
Book value 269,361  
Cash flow contracted 269,361  
Liquidity risk [member] | Commodities derivatives [member] | Non-designated as cash flow hedge [member]    
DisclosureOfFinancialInstrumentsAndRisksManagementLineItems [Line Items]    
Book value 20,036  
Cash flow contracted 20,036  
Liquidity risk [member] | Commodities derivatives [member] | 2021 [member] | Designated as cash flow hedge [member]    
DisclosureOfFinancialInstrumentsAndRisksManagementLineItems [Line Items]    
Book value 268,634  
Liquidity risk [member] | Commodities derivatives [member] | 2021 [member] | Non-designated as cash flow hedge [member]    
DisclosureOfFinancialInstrumentsAndRisksManagementLineItems [Line Items]    
Book value 20,036  
Liquidity risk [member] | Commodities derivatives [member] | 2022 [member] | Designated as cash flow hedge [member]    
DisclosureOfFinancialInstrumentsAndRisksManagementLineItems [Line Items]    
Book value 727  
Liquidity risk [member] | Commodities derivatives [member] | 2022 [member] | Non-designated as cash flow hedge [member]    
DisclosureOfFinancialInstrumentsAndRisksManagementLineItems [Line Items]    
Book value  
Liquidity risk [member] | Commodities derivatives [member] | 2023 [member] | Designated as cash flow hedge [member]    
DisclosureOfFinancialInstrumentsAndRisksManagementLineItems [Line Items]    
Book value  
Liquidity risk [member] | Commodities derivatives [member] | 2023 [member] | Non-designated as cash flow hedge [member]    
DisclosureOfFinancialInstrumentsAndRisksManagementLineItems [Line Items]    
Book value  
Liquidity risk [member] | Commodities derivatives [member] | 2024 [member] | Designated as cash flow hedge [member]    
DisclosureOfFinancialInstrumentsAndRisksManagementLineItems [Line Items]    
Book value  
Liquidity risk [member] | Commodities derivatives [member] | 2024 [member] | Non-designated as cash flow hedge [member]    
DisclosureOfFinancialInstrumentsAndRisksManagementLineItems [Line Items]    
Book value  
Liquidity risk [member] | Commodities derivatives [member] | 2025 [member] | Designated as cash flow hedge [member]    
DisclosureOfFinancialInstrumentsAndRisksManagementLineItems [Line Items]    
Book value  
Liquidity risk [member] | Commodities derivatives [member] | 2025 [member] | Non-designated as cash flow hedge [member]    
DisclosureOfFinancialInstrumentsAndRisksManagementLineItems [Line Items]    
Book value  
Liquidity risk [member] | Commodities derivatives [member] | 2026 onwards [member] | Designated as cash flow hedge [member]    
DisclosureOfFinancialInstrumentsAndRisksManagementLineItems [Line Items]    
Book value  
Liquidity risk [member] | Commodities derivatives [member] | 2026 onwards [member] | Non-designated as cash flow hedge [member]    
DisclosureOfFinancialInstrumentsAndRisksManagementLineItems [Line Items]    
Book value  
Liquidity risk [member] | Interestrate derivatives [member] | Non-designated as cash flow hedge [member]    
DisclosureOfFinancialInstrumentsAndRisksManagementLineItems [Line Items]    
Book value 14,649  
Cash flow contracted 14,649  
Liquidity risk [member] | Interestrate derivatives [member] | 2021 [member] | Non-designated as cash flow hedge [member]    
DisclosureOfFinancialInstrumentsAndRisksManagementLineItems [Line Items]    
Book value R$ 14,649