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EQUITY - Ownership of shares (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2023
Mar. 21, 2023
Dec. 31, 2022
Dec. 31, 2021
EQUITY        
Shares subscribed and paid up 1,757,067,050 1,757,067,050 1,673,397,190 1,719,658,728
Ownership of shares, as a percentage of total issued shares 100.00%   100.00% 100.00%
Total capital R$ 20,215,343   R$ 19,249,181  
Common shares        
EQUITY        
Shares subscribed and paid up 600,526,442 600,526,442 571,929,945 573,627,483
Ownership of shares, as a percentage of total issued shares 100.00%   100.00% 100.00%
Preferred shares        
EQUITY        
Shares subscribed and paid up 1,156,540,608 1,156,540,608 1,101,467,245 1,146,031,245
Ownership of shares, as a percentage of total issued shares 100.00%   100.00% 100.00%
Treasury Stocks        
EQUITY        
Shares subscribed and paid up 7,544,641   9,836,850 13,911,882
Ownership of shares, as a percentage of total issued shares 0.40%   0.70% 0.80%
Treasury Stocks | Common shares        
EQUITY        
Shares subscribed and paid up       1,697,538
Ownership of shares, as a percentage of total issued shares 0.00%   0.00% 0.20%
Treasury Stocks | Preferred shares        
EQUITY        
Shares subscribed and paid up 7,544,641   9,836,850 12,214,344
Ownership of shares, as a percentage of total issued shares 0.70%   0.80% 1.10%
Metalurgica Gerdau S.A.        
EQUITY        
Shares subscribed and paid up 585,793,846   557,898,901 557,898,901
Ownership of shares, as a percentage of total issued shares 33.30%   33.30% 32.40%
Metalurgica Gerdau S.A. | Common shares        
EQUITY        
Shares subscribed and paid up 585,793,846   557,898,901 557,898,901
Ownership of shares, as a percentage of total issued shares 97.50%   97.50% 97.30%
Metalurgica Gerdau S.A. | Preferred shares        
EQUITY        
Ownership of shares, as a percentage of total issued shares 0.00%   0.00% 0.00%
Brazilian institutional investors        
EQUITY        
Shares subscribed and paid up 120,232,304   161,312,577 236,785,217
Ownership of shares, as a percentage of total issued shares 6.80%   9.60% 13.80%
Brazilian institutional investors | Common shares        
EQUITY        
Shares subscribed and paid up 2,442,108   4,292,172 4,363,438
Ownership of shares, as a percentage of total issued shares 0.40%   0.80% 0.80%
Brazilian institutional investors | Preferred shares        
EQUITY        
Shares subscribed and paid up 117,790,196   157,020,405 232,421,779
Ownership of shares, as a percentage of total issued shares 10.20%   14.30% 20.30%
Foreign institutional investors        
EQUITY        
Shares subscribed and paid up 547,646,333   522,514,717 492,705,610
Ownership of shares, as a percentage of total issued shares 31.20%   31.20% 28.70%
Foreign institutional investors | Common shares        
EQUITY        
Shares subscribed and paid up 1,425,937   1,529,109 1,895,038
Ownership of shares, as a percentage of total issued shares 0.20%   0.30% 0.30%
Foreign institutional investors | Preferred shares        
EQUITY        
Shares subscribed and paid up 546,220,396   520,985,608 490,810,572
Ownership of shares, as a percentage of total issued shares 47.20%   47.30% 42.80%
Other shareholders        
EQUITY        
Shares subscribed and paid up 495,849,926   421,834,145 418,357,118
Ownership of shares, as a percentage of total issued shares 28.30%   25.20% 24.30%
Other shareholders | Common shares        
EQUITY        
Shares subscribed and paid up 10,864,551   8,209,763 7,772,568
Ownership of shares, as a percentage of total issued shares 1.90%   1.40% 1.40%
Other shareholders | Preferred shares        
EQUITY        
Shares subscribed and paid up 484,985,375   413,624,382 410,584,550
Ownership of shares, as a percentage of total issued shares 41.90%   37.60% 35.80%