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POST-EMPLOYMENT OBLIGATIONS (Details 2) - BRL (R$)
R$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
IfrsStatementLineItems [Line Items]        
Return on investments R$ (1,004)      
Pension plans and retirement supplement plans [member]        
IfrsStatementLineItems [Line Items]        
Beginning balance 9,198 R$ 9,378 R$ 10,420 R$ 10,366
Return on investments R$ (1,004) 633 (298) 757
Contributions from employer   272 236 211
Benefits paid   (1,085) (980) (914)
Ending balance   R$ 9,198 R$ 9,378 R$ 10,420