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EMPLOYEE BENEFITS (Tables)
 12 Months Ended
Dec. 31, 2024
Employee Benefits  
Schedule of actuarial employee benefit assets and liabilities
               
              Consolidated
  12/31/2024   12/31/2023   12/31/2024   12/31/2023
  Actuarial asset   Actuarial liabilities
Benefits of pension plans  (47,708)   (39,530)    18,884    22,771
Post-employment healthcare benefits          454,162    481,118
   (47,708)   (39,530)    473,046    503,889
Schedule of reconciliation of employee benefits' assets and liabilities
           
          Consolidated
  12/31/2024   12/31/2023   12/31/2022
Present value of defined benefit obligation 2,904,023   3,329,075   3,151,609
Fair value of plan assets  (3,683,575)    (3,713,099)    (3,584,244)
Deficit(Surplus) (779,552)   (384,024)   (432,635)
Restriction to actuarial assets due to recovery limitation  750,728    367,265    373,524
Liabilities (Assets), net  (28,824)   (16,759)   (59,111)
Schedule of defined benefit obligation
           
          Consolidated
  12/31/2024   12/31/2023   12/31/2022
Present value of obligations at the beginning of the year 3,329,075   3,117,307   3,151,609
Consolidation of CSN Cimentos Brazil          78,066
Cost of service 1,509    1,152   1,629
Interest cost  298,872    347,297   324,955
Participant contributions made in the year 1,348    1,404   1,382
Benefits paid (334,094)   (324,750)   (312,301)
Actuarial loss/(gain) (392,687)    186,665   (128,033)
Present value of obligations at the end of the year 2,904,023   3,329,075   3,117,307
Schedule of changes in fair value of the plan assets
           
          Consolidated
  12/31/2024   12/31/2023   12/31/2022
Fair value of plan assets at the beginning of the year  (3,713,099)    (3,572,869)   (3,584,244)
Consolidation of CSN Cimentos Brazil         (63,292)
Interest income (335,322)   (401,054)   (369,488)
Benefits Paid  333,037    324,750   310,471
Participant contributions made in the year  (1,348)   (1,404)   (1,382)
Employer contributions made in the year (165)   (184)   (144)
Return on plan assets (less interest income)  33,322   (62,338)   135,210
Fair value of plan assets at the end of the year  (3,683,575)    (3,713,099)   (3,572,869)
Schedule of employee benefits recognized in the income statement
           
          Consolidated
  12/31/2024   12/31/2023   12/31/2022
Cost of current service 1,509   1,152   1,629
Interest cost  298,872    347,297   324,955
Expected return on plan assets (335,322)   (401,054)   (369,488)
Interest on the asset ceiling effect 34,663    50,076   39,416
Total costs / (income), net (278)   (2,529)   (3,488)
Schedule of actuarial gains and losses
           
          Consolidated
  12/31/2024   12/31/2023   12/31/2022
Actuarial losses and (gains) (392,687)    186,665   (444,480)
Return on plan assets (less interest income) 33,322   (62,338)    138,489
Change in the asset’s limit (excluding interest income)  348,800   (109,355)    175,440
Total cost of actuarial losses and (gains)  (10,565)    14,972   (130,551)
Schedule of breakdown of actuarial gains or losses
         
          Consolidated
  12/31/2024   12/31/2023   12/31/2022
Loss due to change in financial assumptions  (448,752)    194,988   (647,564)
Loss due to experience adjustments 60,215   (13,933)    203,084
Loss due to changes in assumptions  (4,150)   5,610    
Return on plan assets (less interest income) 33,322   (62,338)    138,489
Change in the asset’s limit (excluding interest income)  348,800   (109,355)    175,440
Actuarial losses and (gains) (10,565)    14,972   (130,551)
Schedule of actuarial assumptions used
       
  12/31/2024   12/31/2023
Actuarial financing method Projected unit credit   Projected unit credit
Functional currency Real (R$)   Real (R$)
Recognition of plan assets Fair value   Fair value
Real discount rate Millennium Plan: 7.12%   Millennium Plan: 5.36%
Plan 35%: 7.46%
   Plan 35%: 5.32%
Supplementation: 7.43%    Supplementation: 5.33% 
Mauá Prev: 7.34%   Mauá Prev: 5.34%
Inflation rate 4.96%   3.90%
Nominal salary increase rate 1.00%   1.00%
Nominal benefit increase rate 4.96%   3.90%
Rate of return on investments Millennium Plan: 7.12%   Millennium Plan: 5.36%
Plan 35%: 7.46%   Plan 35%: 5.32%
Supplementation : 7.43%   Supplementation : 5.33%
Mauá Prev: 7.34%   Mauá Prev: 5.34%
General mortality table Millennium Plan: AT-2012 segregated by gender   Millennium Plan: AT-2012 segregated by gender
Plans 35% : AT-2000 Male, aggravated by 15%   Plans 35% : AT-2000 Male, aggravated by 15%
Supplementation: AT-2000 segregated by gender, aggravated by 10%   Supplementation: AT-2000 segregated by gender, aggravated by 10%
Mauá Prev: AT-2000 segregated by gender   Mauá Prev: AT-2000 segregated by gender
  Millennium Plan: Easy light   Millennium Plan: AT-2012 segregated by gender
Disability table Mauá Prev and ACT: ALVARO VINDAS (D50%)   Mauá Prev and ACT: IAPB57
Other Plans: Not applicable   Other Plans: Not applicable
Disability mortality table Millennium Plan: AT 71   Millennium Plan: AT 71
Plans 35%: MI-2006 - 10% M&F   Plans 35%: MI-2006 - 10% M&F
Supplementation: Winklevoss - 10%   Supplementation: Winklevoss - 10%
Mauá Prev and ACT: IAPB-57   Mauá Prev E ACT: Álvaro Vindas smoothed by 50%
Turnover table Millennium Plan 5% per year   Millennium Plan 5% per year
Maua Prev: MercerService   Maua Prev: MercerService
Other Plans: Not applicable   Other Plans: Not applicable
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. 
Schedule of average life expectancy
                             
  Plan covering 35% of the average salary   Average salary supplementation plan   Mixed supplementary benefit plan (Milênio Plan)    Plan ACT   Mauá Prev
Longevity at age of 65 for current participants 12/31/2024 12/31/2023   12/31/2024 12/31/2023   12/31/2024 12/31/2023   12/31/2024 12/31/2023   12/31/2024 12/31/2023
Male  18.38  18.38    18.75  18.75    21.47  21.47    21.47  21.47    21.47  20.24
Female  18.38  18.38    21.41  21.41    23.34  23.34    23.34  23.34    23.34  20.24
                             
Longevity at age of 40 for current participants                            
Male  40.15  40.15    40.60  40.60    44.07  44.07    44.07  44.07    44.07  42.74
Female  40.15  40.15    44.41  44.41    46.68  46.68    46.68  46.68    46.68  42.74
Schedule of allocation of plan assets
                   
      12/31/2024     12/31/2023       12/31/2022
Variable income  358,124   9.72%  190,455   5.13%    193,948   5.43%
Fixed income 2,916,385   79.17% 3,143,056   84.65%    3,106,206   86.94%
Real estate  225,421   6.12%  201,870   5.44%    207,223   5.80%
Others  183,645   4.99%  177,718   4.78%    65,492   1.83%
Total 3,683,575   100.00% 3,713,099   100.00%    3,572,869   100.00%
Schedule of sensitivity analysis
     
      12/31/2024
    Consolidated Effect of Plans
Assumption: Discount rate      
Sensitivity level   0.5% -0.5%
Effect on current service cost and on interest on actuarial obligations    (12,231) 13,065
Effect on present value of obligations    (97,251)  103,859
       
Assumption: Salary growth      
Sensitivity level   0.5% -0.5%
Effect on current service cost and on interest on actuarial obligations    160 (154)
Effect on present value of obligations   1,093  (1,048)
       
Assumption: Mortality table      
Sensitivity level   0.5% -0.5%
Effect on current service cost and on interest on actuarial obligations   1,763  (1,763)
Effect on present value of obligations   13,886  (13,886)
       
Assumption: Benefit adjustment      
Sensitivity level   +1 year - 1 year
Effect on current service cost and on interest on actuarial obligations   8,375  (8,505)
Effect on present value of obligations   66,060  (67,101)
Schedule of forecast benefit payments of the defined benefit plans
     
Forecast payments 2024   2023
Year 1 349,582    339,223
Year 2 325,518    316,898
Year 3 316,201    309,058
Year 4 306,861    299,948
Year 5 296,668    291,230
Next 5 years  1,323,196   1,307,118
Total forecast payments  2,918,026   2,863,475
Schedule of post-employment health care plan amounts
       
  12/31/2024 12/31/2023   12/31/2022
Present value of obligations  454,161  481,118    537,290
Liabilities  454,161  481,118    537,290
Schedule of reconciliation of the healthcare liabilities
       
  12/31/2024 12/31/2023   12/31/2022
Actuarial liability at the beginning of the year  481,118  537,290    584,288
Expenses recognized in income for the year 42,749 58,737   57,926
Sponsor’s contributions transferred in prior year  (51,884)  (51,788)    (62,213)
Recognition of actuarial loss/(gain)   (17,822)  (63,121)    (42,711)
Actuarial liability at the end of the year   454,161  481,118    537,290
         
Schedule of actuarial gains and losses recognized in shareholders' equity
       
  12/31/2024 12/31/2023   12/31/2022
Actuarial gain (loss) on obligation  (17,822)  (63,121)    (42,711)
Gain/(loss) recognized in shareholders' equity   (17,822)  (63,121)    (42,711)
Schedule of weighted average life
         
  12/31/2024   12/31/2023   12/31/2022
Longevity at age of 65 for current participants          
Male 20.24   20.24   20.24
Female 20.24   20.24   20.24
           
Longevity at age of 40 for current participants          
Male 42.74   42.74   42.74
Female 42.74   42.74   42.74
Schedule of actuarial assumptions used for calculating postemployment healthcare benefits
           
  12/31/2024   12/31/2023   12/31/2022
Biometric and Demographic          
General mortality table AT 2000 separated by gender 20%   AT 2000 segregated by gender 20%   AT 2000 segregated by gender 20%
Financial          
Actuarial nominal discount rate 13.01%   5.33%   6.10%
Inflation 4.96%   3.90%   5.31%
Real increase in medical costs based on age (Aging Factor)  0.5% - 3.00% real a.a.   0.5% - 3.00% real a.a.   0,5% - 3,00% real a.a.
Nominal increase medical costs growth rate  4.10%   4.10%   4.10%
Average medical cost (Claim cost)  1,320.89    1,204.48    1,084.14
Schedule of quantitative sensitivity analysis for significant assumptions
     
      12/31/2024
    Healthcare Plan
    Assumption: Discount rate
Sensitivity level   0.5% -0.5%
Effect on current service cost and on interest on actuarial obligations    (1,653,603) 1,759,748
Effect on present value of obligations    (12,709,824) 13,525,671
       
    Assumption: Medical Inflation
Sensitivity level   1.0% -1.0%
Effect on current service cost and on interest on actuarial obligations   4,032,880  (3,612,889)
Effect on present value of obligations   30,997,282  (27,769,167)
       
    Assumption: Benefit adjustment
Sensitivity level   +1 year - 1 year
Effect on current service cost and on interest on actuarial obligations    (3,191,999) 3,354,304
Effect on present value of obligations    (24,534,152) 25,781,654
Schedule of forecast benefit payments of the postemployment healthcare plans
       
Forecast benefit payments   12/31/2024   12/31/2023
Year 1   66,468    57,627
Year 2   62,452    54,710
Year 3   58,572    51,820
Year 4   54,760    48,925
Year 5   51,020    46,015
Next 5 years    202,310    187,093
Total forecast payments    495,582    446,190