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POST-EMPLOYMENT BENEFIT - Fair value of plan assets (Details) - Plan assets - Social security defined benefit plans - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Defined Pension Benefits    
Fair value of assets at the beginning of the year R$ 25,989,959 R$ 23,780,227
Benefits paid during the fiscal year (2,910,322) (2,635,428)
Participant contributions made during the financial year 9,592  
Employer contributions paid during the fiscal year 441,038 476,899
Gain/Loss on plan assets (excluding interest income) 666,993 2,012,962
Expected return on assets in the year 918,413 (2,355,299)
Fair value of assets at the end of the year R$ 23,278,847 R$ 25,989,959