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Pension plan obligations (Details 1) - BRL (R$)
R$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
IfrsStatementLineItems [Line Items]    
Subtotal R$ 55,818 R$ 58,608
Capitalized (1,150) (764)
Reimbursement of additional retirement and pension benefits paid (G0) (28,040) (24,622)
Other 1,508 1,441
Pension plan obligations (Note 29) 28,136 34,663
G 1 Plan [Member]    
IfrsStatementLineItems [Line Items]    
Subtotal 1,560 (4,384)
G 0 Plan [Member]    
IfrsStatementLineItems [Line Items]    
Subtotal 47,319 56,305
Sabesprev Mais Plan [Member]    
IfrsStatementLineItems [Line Items]    
Subtotal 6,750 6,603
VIVEST Plan [Member]    
IfrsStatementLineItems [Line Items]    
Subtotal R$ 189 R$ 84