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EMPLOYEE BENEFITS (Details 7)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
IfrsStatementLineItems [Line Items]    
Actuarial financing method Projected unit credit Projected unit credit
Functional currency Real (R$) Real (R$)
Recognition of plan assets Fair value Fair value
Inflation rate 3.90% 5.31%
Nominal salary increase rate 1.00% 1.00%
Nominal benefit increase rate 3.90% 5.31%
Retirement age  100% on the first date he/she becomes eligible for programmed retirement benefit under the plan   100% on the first date he/she becomes eligible for programmed retirement benefit under the plan 
Household of active participants  90% will be married at the time of retirement for the Mauá Prev and ACT Plans, and 95% for the other Plans. The wife being 4 years younger than her husband.   95% will be married at the time of retirement, with the wife being 4 years younger than the husband 
Millennium Plan [Member]    
IfrsStatementLineItems [Line Items]    
Nominal discount rate Millennium Plan: 5.36% Millennium Plan: 6.14%
Rate of return on investments Millennium Plan: 5.36% Millennium Plan: 6.14%
General mortality table Millennium Plan: AT-2012 segregated by gender Millennium Plan: AT-2012 segregated by gender
Disability table Millennium Plan: AT-2012 segregated by gender Millennium Plan: Prudential (Ferr Apos) unaggravated by 10%
Disability mortality table Millennium Plan: AT 71 Millennium Plan: AT 71
Turnover table Millennium Plan 5% per year Millennium Plan 5% per year
Plan [Member]    
IfrsStatementLineItems [Line Items]    
Nominal discount rate Plan 35%: 5.32% Plan 35%: 6.10%
Rate of return on investments Plan 35%: 5,32% Plan 35%: 6.10%
General mortality table Plans 35% : AT-2000 Male, aggravated by 15% Plans 35% : AT-2000 Male, aggravated by 15%
Disability table   Plan 35%: Medium Light
Disability mortality table Plans 35%: MI-2006 - 10% M&F Plans 35%: MI-2006 - 10% M&F
Supplementation [Member]    
IfrsStatementLineItems [Line Items]    
Nominal discount rate Supplementation: 5.33% Supplementation: 6.10%
Rate of return on investments Supplementation : 5.33% Supplementation : 6.10%
General mortality table Supplementation: AT-2000 segregated by gender, aggravated by 10% Supplementation: AT-2000 segregated by gender, aggravated by 10%
Disability table   Supplementation: Not applied
Disability mortality table Supplementation: Winklevoss - 10% Supplementation: Winklevoss - 10%
Turnover table   Null for 35% Plans and Supplementation
Maua Prev [Member]    
IfrsStatementLineItems [Line Items]    
Nominal discount rate Mauá Prev: 5.34% Mauá Prev: 6.10%
Rate of return on investments Mauá Prev: 5.34% Mauá Prev: 6.10%
General mortality table Mauá Prev: AT-2012 segregated by gender Mauá Prev: AT-2000 segregated by gender
Disability table Mauá Prev and ACT: IAPB57 Mauá Prev: Mercer Disability
Disability mortality table Mauá Prev E ACT: Álvaro Vindas smoothed by 50% Mauá Prev: IAPB-57
Turnover table Maua Prev: MercerService Maua Prev: up to 10 minimum wages 20%, up to 20 minimum wages 15% and above 20 minimum wages 10%
Other Plans [Member]    
IfrsStatementLineItems [Line Items]    
Disability table Other Plans: Not applicable  
Turnover table Other Plans: Not applicable