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Pension plan obligations (Details 10) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
IfrsStatementLineItems [Line Items]      
Subtotal R$ 116,162 R$ 112,400 R$ 158,344
Expenses capitalized in assets (3,359) (4,118) (4,904)
Other 5,684 5,527 5,841
Pension plan obligations (Note 29) 118,487 113,809 159,281
G 1 Plan [Member]      
IfrsStatementLineItems [Line Items]      
Subtotal 11,686 23,247 25,776
G 0 Plan [Member]      
IfrsStatementLineItems [Line Items]      
Subtotal 78,779 66,587 110,810
Sabesprev Mais Plan [Member]      
IfrsStatementLineItems [Line Items]      
Subtotal 25,371 22,406 21,700
V I V E S T Plan [Member]      
IfrsStatementLineItems [Line Items]      
Subtotal R$ 326 R$ 160 R$ 58