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EMPLOYEE BENEFITS (Details 7)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
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 4.96% 3.90%
Nominal salary increase rate 1.00% 1.00%
Nominal benefit increase rate 4.96% 3.90%
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  For the Mauá Prev and ACT Plans, 90% of participants are expected to be married at retirement, while this figure is 95% for other Plans. Female spouses are assumed to be 4 years younger than male participants.   For the Mauá Prev and ACT Plans, 90% of participants are expected to be married at retirement, while this figure is 95% for other Plans. Female spouses are assumed to be 4 years younger than male participants. 
Millennium Plan [Member]    
IfrsStatementLineItems [Line Items]    
Nominal discount rate Millennium Plan: 7.12% Millennium Plan: 5.36%
Rate of return on investments Millennium Plan: 7.12% Millennium Plan: 5.36%
General mortality table Millennium Plan: AT-2012 segregated by gender Millennium Plan: AT-2012 segregated by gender
Disability table Millennium Plan: Easy light Millennium Plan: AT-2012 segregated by gender
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%: 7.46% Plan 35%: 5.32%
Rate of return on investments Plan 35%: 7.46% Plan 35%: 5.32%
General mortality table Plans 35% : AT-2000 Male, aggravated by 15% Plans 35% : AT-2000 Male, aggravated by 15%
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: 7.43% Supplementation: 5.33%
Rate of return on investments Supplementation : 7.43% Supplementation : 5.33%
General mortality table Supplementation: AT-2000 segregated by gender, aggravated by 10% Supplementation: AT-2000 segregated by gender, aggravated by 10%
Disability mortality table Supplementation: Winklevoss - 10% Supplementation: Winklevoss - 10%
Maua Prev [Member]    
IfrsStatementLineItems [Line Items]    
Nominal discount rate Mauá Prev: 7.34% Mauá Prev: 5.34%
Rate of return on investments Mauá Prev: 7.34% Mauá Prev: 5.34%
General mortality table Mauá Prev: AT-2000 segregated by gender Mauá Prev: AT-2000 segregated by gender
Disability table Mauá Prev and ACT: ALVARO VINDAS (D50%) Mauá Prev and ACT: IAPB57
Disability mortality table Mauá Prev and ACT: IAPB-57 Mauá Prev E ACT: Álvaro Vindas smoothed by 50%
Turnover table Maua Prev: MercerService Maua Prev: MercerService
Other Plans [Member]    
IfrsStatementLineItems [Line Items]    
Disability table Other Plans: Not applicable Other Plans: Not applicable
Turnover table Other Plans: Not applicable Other Plans: Not applicable