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EMPLOYEE BENEFITS - Net Liability for Defined Benefit Plans (Details) - BRL (R$)
R$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
IfrsStatementLineItems [Line Items]      
Present value of funded obligations R$ (5,476.5) R$ (7,354.3) R$ (7,582.0)
Fair value of plan assets 4,543.3 5,638.0 5,533.3
Present value of net obligations (933.2) (1,716.3) (2,048.7)
Present value of unfunded obligations (921.0) (1,165.4) (1,195.6)
Present value of net obligations  (1,854.2) (2,881.7) (3,244.3)
Asset ceiling (163.3) (180.1) (160.5)
Net liabilities (2,017.5) (3,061.8) (3,404.8)
Other long term employee benefits (87.1) (104.3) (105.5)
Net liabilities (2,104.6) (3,166.1) (3,510.3)
Total employee benefit 2,104.6 3,166.1 3,510.3
Employee benefits assets [member]      
IfrsStatementLineItems [Line Items]      
Net liabilities (56.6) (27.9) (33.6)
Total employee benefit 56.6 27.9 33.6
Employee benefit liabilities [member]      
IfrsStatementLineItems [Line Items]      
Net liabilities 2,161.2 3,194.0 3,543.9
Total employee benefit R$ (2,161.2) R$ (3,194.0) R$ (3,543.9)