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POST-EMPLOYMENT BENEFIT - Conciliation of the liabilities of other retirement benefits (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Other post-employment benefit obligations    
Amounts recognized in balance sheet and statement of income for the year    
Current service cost R$ 39,001 R$ 42,245
Net interest cost 2,703,475 2,622,700
Actuarial expense / (revenue) recognized in the year 2,742,476 2,664,945
Health and life insurance plans    
Amounts recognized in balance sheet and statement of income for the year    
The Actuarial Present Value obligations 162,635 255,181
Net liabilities / (assets) 162,635 255,181
Current service cost 9,652 757
Net interest cost 16,404 20,741
Actuarial expense / (revenue) recognized in the year R$ 26,057 R$ 21,498