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Pension plan obligations (Details 10) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
IfrsStatementLineItems [Line Items]      
Subtotal R$ 103,188 R$ 159,305 R$ 116,162
Expenses capitalized in assets (7,884) (3,303) (3,359)
Other 10,653 6,603 5,684
Pension plan obligations (Note 29) 105,957 162,605 118,487
G1 Plan [Member]      
IfrsStatementLineItems [Line Items]      
Subtotal 6,252 18,986 11,686
G0 Plan [Member]      
IfrsStatementLineItems [Line Items]      
Subtotal 69,768 112,396 78,779
Sabesprev Mais Plan [Member]      
IfrsStatementLineItems [Line Items]      
Subtotal 26,198 27,403 25,371
VIVEST Plan [Member]      
IfrsStatementLineItems [Line Items]      
Subtotal R$ 970 R$ 520 R$ 326