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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
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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%

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