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Retirement plans libilities (Details 1) - BRL (R$)
R$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Disclosure of defined benefit plans [table]    
Net defined benefit liability R$ 93,023,422 R$ 66,224,387
Without insurance risk [Member]    
Disclosure of defined benefit plans [table]    
Net defined benefit liability 84,446,347 66,104,805
Insurance risk [member]    
Disclosure of defined benefit plans [table]    
Net defined benefit liability 8,260,312 0
Insurance liabilities [Member]    
Disclosure of defined benefit plans [table]    
Net defined benefit liability R$ 316,763 R$ 119,582