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Pension plan obligations (Details 4)
R$ in Thousands
 12 Months Ended
Dec. 31, 2024
BRL (R$)
G1 Plan [Member]  
IfrsStatementLineItems [Line Items]  
Payment of benefits expected in 2025 R$ 242,375
Payment of benefits expected in 2026 183,508
Payment of benefits expected in 2027 170,984
Payment of benefits expected in 2028 158,676
Payment of benefits expected in 2029 or after 1,580,395
Payment of benefits expected R$ 2,335,938
Duration 11 years 3 months 7 days
G0 Plan [Member]  
IfrsStatementLineItems [Line Items]  
Payment of benefits expected in 2025 R$ 202,302
Payment of benefits expected in 2026 183,508
Payment of benefits expected in 2027 170,985
Payment of benefits expected in 2028 158,676
Payment of benefits expected in 2029 or after 1,215,674
Payment of benefits expected R$ 1,931,145
Duration 9 years 7 months 28 days