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Schedule of liquidity risk (Details) - Liquidity risk [member]
R$ in Thousands
Dec. 31, 2021
BRL (R$)
IfrsStatementLineItems [Line Items]  
Total financial liabilities under undiscounted cash flow R$ 26,772,677
Loans And Financing [Member]  
IfrsStatementLineItems [Line Items]  
Total financial liabilities under undiscounted cash flow 5,146,307
Changes in Actuarial Assets  
IfrsStatementLineItems [Line Items]  
Total financial liabilities under undiscounted cash flow 11,242,276
Payable Related To Concession [Member]  
IfrsStatementLineItems [Line Items]  
Total financial liabilities under undiscounted cash flow 3,042,370
Accounts Payable To Suppliers [Member]  
IfrsStatementLineItems [Line Items]  
Total financial liabilities under undiscounted cash flow 2,710,984
Ordinary financing of taxes with the federal tax authorities  
IfrsStatementLineItems [Line Items]  
Total financial liabilities under undiscounted cash flow 3,363,440
Special Tax Regularization Program Pert [Member]  
IfrsStatementLineItems [Line Items]  
Total financial liabilities under undiscounted cash flow 544,992
Sectorial Financial Liabilities [Member]  
IfrsStatementLineItems [Line Items]  
Total financial liabilities under undiscounted cash flow 330,748
Lease Liability [Member]  
IfrsStatementLineItems [Line Items]  
Total financial liabilities under undiscounted cash flow 391,560
Not later than one month [member]  
IfrsStatementLineItems [Line Items]  
Total financial liabilities under undiscounted cash flow 2,489,258
Not later than one month [member] | Loans And Financing [Member]  
IfrsStatementLineItems [Line Items]  
Total financial liabilities under undiscounted cash flow 37,039
Not later than one month [member] | Changes in Actuarial Assets  
IfrsStatementLineItems [Line Items]  
Total financial liabilities under undiscounted cash flow 65,956
Not later than one month [member] | Payable Related To Concession [Member]  
IfrsStatementLineItems [Line Items]  
Total financial liabilities under undiscounted cash flow 8,948
Not later than one month [member] | Accounts Payable To Suppliers [Member]  
IfrsStatementLineItems [Line Items]  
Total financial liabilities under undiscounted cash flow 2,355,760
Not later than one month [member] | Ordinary financing of taxes with the federal tax authorities  
IfrsStatementLineItems [Line Items]  
Total financial liabilities under undiscounted cash flow
Not later than one month [member] | Special Tax Regularization Program Pert [Member]  
IfrsStatementLineItems [Line Items]  
Total financial liabilities under undiscounted cash flow 4,375
Not later than one month [member] | Sectorial Financial Liabilities [Member]  
IfrsStatementLineItems [Line Items]  
Total financial liabilities under undiscounted cash flow 11,736
Not later than one month [member] | Lease Liability [Member]  
IfrsStatementLineItems [Line Items]  
Total financial liabilities under undiscounted cash flow 5,444
Later than one month and not later than three months [member]  
IfrsStatementLineItems [Line Items]  
Total financial liabilities under undiscounted cash flow 452,074
Later than one month and not later than three months [member] | Loans And Financing [Member]  
IfrsStatementLineItems [Line Items]  
Total financial liabilities under undiscounted cash flow 97,025
Later than one month and not later than three months [member] | Changes in Actuarial Assets  
IfrsStatementLineItems [Line Items]  
Total financial liabilities under undiscounted cash flow 56,696
Later than one month and not later than three months [member] | Payable Related To Concession [Member]  
IfrsStatementLineItems [Line Items]  
Total financial liabilities under undiscounted cash flow 17,904
Later than one month and not later than three months [member] | Accounts Payable To Suppliers [Member]  
IfrsStatementLineItems [Line Items]  
Total financial liabilities under undiscounted cash flow 236,941
Later than one month and not later than three months [member] | Ordinary financing of taxes with the federal tax authorities  
IfrsStatementLineItems [Line Items]  
Total financial liabilities under undiscounted cash flow
Later than one month and not later than three months [member] | Special Tax Regularization Program Pert [Member]  
IfrsStatementLineItems [Line Items]  
Total financial liabilities under undiscounted cash flow 8,829
Later than one month and not later than three months [member] | Sectorial Financial Liabilities [Member]  
IfrsStatementLineItems [Line Items]  
Total financial liabilities under undiscounted cash flow 23,760
Later than one month and not later than three months [member] | Lease Liability [Member]  
IfrsStatementLineItems [Line Items]  
Total financial liabilities under undiscounted cash flow 10,919
Later than three months and not later than one year [member]  
IfrsStatementLineItems [Line Items]  
Total financial liabilities under undiscounted cash flow 3,794,578
Later than three months and not later than one year [member] | Loans And Financing [Member]  
IfrsStatementLineItems [Line Items]  
Total financial liabilities under undiscounted cash flow 729,794
Later than three months and not later than one year [member] | Changes in Actuarial Assets  
IfrsStatementLineItems [Line Items]  
Total financial liabilities under undiscounted cash flow 2,727,331
Later than three months and not later than one year [member] | Payable Related To Concession [Member]  
IfrsStatementLineItems [Line Items]  
Total financial liabilities under undiscounted cash flow 82,977
Later than three months and not later than one year [member] | Accounts Payable To Suppliers [Member]  
IfrsStatementLineItems [Line Items]  
Total financial liabilities under undiscounted cash flow 51,322
Later than three months and not later than one year [member] | Ordinary financing of taxes with the federal tax authorities  
IfrsStatementLineItems [Line Items]  
Total financial liabilities under undiscounted cash flow
Later than three months and not later than one year [member] | Special Tax Regularization Program Pert [Member]  
IfrsStatementLineItems [Line Items]  
Total financial liabilities under undiscounted cash flow 41,411
Later than three months and not later than one year [member] | Sectorial Financial Liabilities [Member]  
IfrsStatementLineItems [Line Items]  
Total financial liabilities under undiscounted cash flow 112,857
Later than three months and not later than one year [member] | Lease Liability [Member]  
IfrsStatementLineItems [Line Items]  
Total financial liabilities under undiscounted cash flow 48,886
Later than one year and not later than five years [member]  
IfrsStatementLineItems [Line Items]  
Total financial liabilities under undiscounted cash flow 12,901,790
Later than one year and not later than five years [member] | Loans And Financing [Member]  
IfrsStatementLineItems [Line Items]  
Total financial liabilities under undiscounted cash flow 2,047,981
Later than one year and not later than five years [member] | Changes in Actuarial Assets  
IfrsStatementLineItems [Line Items]  
Total financial liabilities under undiscounted cash flow 6,362,806
Later than one year and not later than five years [member] | Payable Related To Concession [Member]  
IfrsStatementLineItems [Line Items]  
Total financial liabilities under undiscounted cash flow 500,875
Later than one year and not later than five years [member] | Accounts Payable To Suppliers [Member]  
IfrsStatementLineItems [Line Items]  
Total financial liabilities under undiscounted cash flow 66,961
Later than one year and not later than five years [member] | Ordinary financing of taxes with the federal tax authorities  
IfrsStatementLineItems [Line Items]  
Total financial liabilities under undiscounted cash flow 3,363,440
Later than one year and not later than five years [member] | Special Tax Regularization Program Pert [Member]  
IfrsStatementLineItems [Line Items]  
Total financial liabilities under undiscounted cash flow 258,120
Later than one year and not later than five years [member] | Sectorial Financial Liabilities [Member]  
IfrsStatementLineItems [Line Items]  
Total financial liabilities under undiscounted cash flow 182,395
Later than one year and not later than five years [member] | Lease Liability [Member]  
IfrsStatementLineItems [Line Items]  
Total financial liabilities under undiscounted cash flow 119,212
Later than five years [member]  
IfrsStatementLineItems [Line Items]  
Total financial liabilities under undiscounted cash flow 7,134,977
Later than five years [member] | Loans And Financing [Member]  
IfrsStatementLineItems [Line Items]  
Total financial liabilities under undiscounted cash flow 2,234,468
Later than five years [member] | Changes in Actuarial Assets  
IfrsStatementLineItems [Line Items]  
Total financial liabilities under undiscounted cash flow 2,029,487
Later than five years [member] | Payable Related To Concession [Member]  
IfrsStatementLineItems [Line Items]  
Total financial liabilities under undiscounted cash flow 2,431,666
Later than five years [member] | Accounts Payable To Suppliers [Member]  
IfrsStatementLineItems [Line Items]  
Total financial liabilities under undiscounted cash flow
Later than five years [member] | Ordinary financing of taxes with the federal tax authorities  
IfrsStatementLineItems [Line Items]  
Total financial liabilities under undiscounted cash flow
Later than five years [member] | Special Tax Regularization Program Pert [Member]  
IfrsStatementLineItems [Line Items]  
Total financial liabilities under undiscounted cash flow 232,257
Later than five years [member] | Sectorial Financial Liabilities [Member]  
IfrsStatementLineItems [Line Items]  
Total financial liabilities under undiscounted cash flow
Later than five years [member] | Lease Liability [Member]  
IfrsStatementLineItems [Line Items]  
Total financial liabilities under undiscounted cash flow R$ 207,099