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Financial instruments and risk management (Details 2) - BRL (R$)
R$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
IfrsStatementLineItems [Line Items]    
Cash flow contracted R$ 59,819 R$ 174,699
Liquidity risk [member]    
IfrsStatementLineItems [Line Items]    
Cash flow contracted 470,011  
Loans and Borrowings [Member] | Liquidity risk [member]    
IfrsStatementLineItems [Line Items]    
Book value 20,095,548  
Cash flow contracted 29,239,484  
Loans and Borrowings [Member] | Liquidity risk [member] | Not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Cash flow contracted 3,360,512  
Loans and Borrowings [Member] | Liquidity risk [member] | Later than one year and not later than two years [member]    
IfrsStatementLineItems [Line Items]    
Cash flow contracted 2,381,197  
Loans and Borrowings [Member] | Liquidity risk [member] | Later than two years and not later than three years [member]    
IfrsStatementLineItems [Line Items]    
Cash flow contracted 3,865,863  
Loans and Borrowings [Member] | Liquidity risk [member] | Later than three years and not later than four years [member]    
IfrsStatementLineItems [Line Items]    
Cash flow contracted 3,784,178  
Loans and Borrowings [Member] | Liquidity risk [member] | Later than four years and not later than five years [member]    
IfrsStatementLineItems [Line Items]    
Cash flow contracted 1,507,940  
Loans and Borrowings [Member] | Liquidity risk [member] | Later than five years [member]    
IfrsStatementLineItems [Line Items]    
Cash flow contracted 14,339,794  
Principal [Member] | Liquidity risk [member]    
IfrsStatementLineItems [Line Items]    
Cash flow contracted 19,856,354  
Principal [Member] | Liquidity risk [member] | Not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Cash flow contracted 2,073,011  
Principal [Member] | Liquidity risk [member] | Later than one year and not later than two years [member]    
IfrsStatementLineItems [Line Items]    
Cash flow contracted 1,355,195  
Principal [Member] | Liquidity risk [member] | Later than two years and not later than three years [member]    
IfrsStatementLineItems [Line Items]    
Cash flow contracted 2,929,729  
Principal [Member] | Liquidity risk [member] | Later than three years and not later than four years [member]    
IfrsStatementLineItems [Line Items]    
Cash flow contracted 2,984,936  
Principal [Member] | Liquidity risk [member] | Later than four years and not later than five years [member]    
IfrsStatementLineItems [Line Items]    
Cash flow contracted 939,150  
Principal [Member] | Liquidity risk [member] | Later than five years [member]    
IfrsStatementLineItems [Line Items]    
Cash flow contracted 9,574,333  
Interest [Member] | Liquidity risk [member]    
IfrsStatementLineItems [Line Items]    
Cash flow contracted 9,383,130  
Interest [Member] | Liquidity risk [member] | Not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Cash flow contracted 1,287,501  
Interest [Member] | Liquidity risk [member] | Later than one year and not later than two years [member]    
IfrsStatementLineItems [Line Items]    
Cash flow contracted 1,026,002  
Interest [Member] | Liquidity risk [member] | Later than two years and not later than three years [member]    
IfrsStatementLineItems [Line Items]    
Cash flow contracted 936,134  
Interest [Member] | Liquidity risk [member] | Later than three years and not later than four years [member]    
IfrsStatementLineItems [Line Items]    
Cash flow contracted 799,242  
Interest [Member] | Liquidity risk [member] | Later than four years and not later than five years [member]    
IfrsStatementLineItems [Line Items]    
Cash flow contracted 568,790  
Interest [Member] | Liquidity risk [member] | Later than five years [member]    
IfrsStatementLineItems [Line Items]    
Cash flow contracted 4,765,461  
Trade Accounts Payable [Member] | Liquidity risk [member]    
IfrsStatementLineItems [Line Items]    
Book value 12,592,428  
Trade Accounts Payable [Member] | Liquidity risk [member] | Not Designated Cash Flow Hedges [Member]    
IfrsStatementLineItems [Line Items]    
Cash flow contracted 12,757,347  
Trade Accounts Payable [Member] | Liquidity risk [member] | Not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Cash flow contracted 12,758,551  
Trade Accounts Payable [Member] | Liquidity risk [member] | Later than one year and not later than two years [member]    
IfrsStatementLineItems [Line Items]    
Cash flow contracted 175  
Trade Accounts Payable [Member] | Liquidity risk [member] | Later than two years and not later than three years [member]    
IfrsStatementLineItems [Line Items]    
Cash flow contracted 1,029  
Trade Accounts Payable [Member] | Liquidity risk [member] | Later than three years and not later than four years [member]    
IfrsStatementLineItems [Line Items]    
Cash flow contracted  
Trade Accounts Payable [Member] | Liquidity risk [member] | Later than four years and not later than five years [member]    
IfrsStatementLineItems [Line Items]    
Cash flow contracted  
Trade Accounts Payable [Member] | Liquidity risk [member] | Later than five years [member]    
IfrsStatementLineItems [Line Items]    
Cash flow contracted  
Lease liabilities [member] | Liquidity risk [member]    
IfrsStatementLineItems [Line Items]    
Book value 3,721,847  
Cash flow contracted 4,661,489  
Lease liabilities [member] | Liquidity risk [member] | Not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Cash flow contracted 1,009,012  
Lease liabilities [member] | Liquidity risk [member] | Later than one year and not later than two years [member]    
IfrsStatementLineItems [Line Items]    
Cash flow contracted 784,287  
Lease liabilities [member] | Liquidity risk [member] | Later than two years and not later than three years [member]    
IfrsStatementLineItems [Line Items]    
Cash flow contracted 622,935  
Lease liabilities [member] | Liquidity risk [member] | Later than three years and not later than four years [member]    
IfrsStatementLineItems [Line Items]    
Cash flow contracted 554,953  
Lease liabilities [member] | Liquidity risk [member] | Later than four years and not later than five years [member]    
IfrsStatementLineItems [Line Items]    
Cash flow contracted 398,258  
Lease liabilities [member] | Liquidity risk [member] | Later than five years [member]    
IfrsStatementLineItems [Line Items]    
Cash flow contracted 1,292,044  
Foreign Exchange Risk [Member] | Liquidity risk [member]    
IfrsStatementLineItems [Line Items]    
Book value 59,749  
Cash flow contracted 59,749  
Foreign Exchange Risk [Member] | Liquidity risk [member] | Not later than one year [member] | Cash Flow Hedges Derivative Instruments [Member]    
IfrsStatementLineItems [Line Items]    
Cash flow contracted 59,749  
Foreign Exchange Risk [Member] | Liquidity risk [member] | Later than one year and not later than two years [member] | Cash Flow Hedges Derivative Instruments [Member]    
IfrsStatementLineItems [Line Items]    
Cash flow contracted  
Foreign Exchange Risk [Member] | Liquidity risk [member] | Later than three years and not later than four years [member] | Cash Flow Hedges Derivative Instruments [Member]    
IfrsStatementLineItems [Line Items]    
Cash flow contracted  
Foreign Exchange Risk [Member] | Liquidity risk [member] | Later than four years and not later than five years [member] | Cash Flow Hedges Derivative Instruments [Member]    
IfrsStatementLineItems [Line Items]    
Cash flow contracted  
Foreign Exchange Risk [Member] | Liquidity risk [member] | Later than five years [member] | Cash Flow Hedges Derivative Instruments [Member]    
IfrsStatementLineItems [Line Items]    
Cash flow contracted  
Foreign Exchange Risk [Member] | Liquidity risk [member] | Later than one year and not later than three years [member] | Cash Flow Hedges Derivative Instruments [Member]    
IfrsStatementLineItems [Line Items]    
Cash flow contracted  
Commodities Price Risk [Member] | Liquidity risk [member]    
IfrsStatementLineItems [Line Items]    
Book value 14,363  
Cash flow contracted 14,363  
Commodities Price Risk [Member] | Liquidity risk [member] | Not later than one year [member] | Cash Flow Hedges Derivative Instruments [Member]    
IfrsStatementLineItems [Line Items]    
Cash flow contracted 14,363  
Commodities Price Risk [Member] | Liquidity risk [member] | Later than one year and not later than two years [member] | Cash Flow Hedges Derivative Instruments [Member]    
IfrsStatementLineItems [Line Items]    
Cash flow contracted  
Commodities Price Risk [Member] | Liquidity risk [member] | Later than three years and not later than four years [member] | Cash Flow Hedges Derivative Instruments [Member]    
IfrsStatementLineItems [Line Items]    
Cash flow contracted  
Commodities Price Risk [Member] | Liquidity risk [member] | Later than four years and not later than five years [member] | Cash Flow Hedges Derivative Instruments [Member]    
IfrsStatementLineItems [Line Items]    
Cash flow contracted  
Commodities Price Risk [Member] | Liquidity risk [member] | Later than five years [member] | Cash Flow Hedges Derivative Instruments [Member]    
IfrsStatementLineItems [Line Items]    
Cash flow contracted  
Commodities Price Risk [Member] | Liquidity risk [member] | Later than one year and not later than three years [member] | Cash Flow Hedges Derivative Instruments [Member]    
IfrsStatementLineItems [Line Items]    
Cash flow contracted  
Foreign Exchange Risks [Member] | Liquidity risk [member]    
IfrsStatementLineItems [Line Items]    
Book value 62,647  
Cash flow contracted 18,732  
Foreign Exchange Risks [Member] | Liquidity risk [member] | Not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Cash flow contracted  
Foreign Exchange Risks [Member] | Liquidity risk [member] | Later than one year and not later than two years [member]    
IfrsStatementLineItems [Line Items]    
Cash flow contracted  
Foreign Exchange Risks [Member] | Liquidity risk [member] | Later than three years and not later than four years [member]    
IfrsStatementLineItems [Line Items]    
Cash flow contracted 18,732  
Foreign Exchange Risks [Member] | Liquidity risk [member] | Later than four years and not later than five years [member]    
IfrsStatementLineItems [Line Items]    
Cash flow contracted  
Foreign Exchange Risks [Member] | Liquidity risk [member] | Later than five years [member]    
IfrsStatementLineItems [Line Items]    
Cash flow contracted  
Foreign Exchange Risks [Member] | Liquidity risk [member] | Later than one year and not later than three years [member]    
IfrsStatementLineItems [Line Items]    
Cash flow contracted