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POST-EMPLOYMENT BENEFIT - Social security plans (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Social Security Plans      
Balance Sheet      
Present value of partially or fully covered actuarial obligations R$ 24,356,024 R$ 29,632,116  
Asset ceiling 1,766,372 1,782,006  
Debt contract 687,956    
Fair value of plan assets (23,278,847) (25,989,959)  
Immediate Available Values 1,337 3,801  
Realizable assets 546,132 520,777  
Fixed Income Investments 27,835,826 30,720,143  
Variable Income Investments 2,268,799 3,110,626  
Real Estate Investments 493,307 650,284  
Structured Investments 1,281,812 855,390  
Loans and Financing 396,303 505,226  
Pension fund - Reserve allocation 103,483 92,504  
Others 815 227,507  
Defined contribution plan assets (8,422,867) (9,443,800)  
Operating liabilities (139,415) (176,996)  
Contingent Liabilities (205,646) (228,196)  
Investment Funds (204,902) (222,948)  
Administrative Funds (546,132) (520,777)  
Pension Funds (130,005) (103,582)  
Net liabilities 3,531,505 5,424,163  
Other post-employment benefit obligations      
Income Statement      
Current service cost 40,101 39,001 R$ 42,245
Net interest cost 2,559,602 2,703,475 2,622,700
Actuarial expense / (revenue) recognized in the year R$ 2,599,703 R$ 2,742,476 R$ 2,664,945