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EQUITY - Ownership of shares (Details) - BRL (R$) R$ in Thousands | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
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EQUITY |  |  |
Shares subscribed and paid up | 1,673,397,190 | 1,719,658,728 | 1,719,658,728
Ownership of shares, as a percentage of total issued shares | 100.00% | 100.00% | 100.00%
Total capital | R$ 19,249,181 | R$ 19,249,181 |
Common shares |  |  |
EQUITY |  |  |
Shares subscribed and paid up | 571,929,945 | 573,627,483 | 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 | 1,101,467,245 | 1,146,031,245 | 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 | 9,836,850 | 13,911,882 | 18,497,296
Ownership of shares, as a percentage of total issued shares | 0.70% | 0.80% | 1.10%
Treasury Stocks | Common shares |  |  |
EQUITY |  |  |
Shares subscribed and paid up |  | 1,697,538 | 1,697,538
Ownership of shares, as a percentage of total issued shares | 0.00% | 0.20% | 0.30%
Treasury Stocks | Preferred shares |  |  |
EQUITY |  |  |
Shares subscribed and paid up | 9,836,850 | 12,214,344 | 16,799,758
Ownership of shares, as a percentage of total issued shares | 0.80% | 1.10% | 1.50%
Metalurgica Gerdau S.A. |  |  |
EQUITY |  |  |
Shares subscribed and paid up | 557,898,901 | 557,898,901 | 560,046,701
Ownership of shares, as a percentage of total issued shares | 33.30% | 32.40% | 32.60%
Metalurgica Gerdau S.A. | Common shares |  |  |
EQUITY |  |  |
Shares subscribed and paid up | 557,898,901 | 557,898,901 | 557,898,901
Ownership of shares, as a percentage of total issued shares | 97.50% | 97.30% | 97.30%
Metalurgica Gerdau S.A. | Preferred shares |  |  |
EQUITY |  |  |
Shares subscribed and paid up |  |  | 2,147,800
Ownership of shares, as a percentage of total issued shares | 0.00% |  | 0.20%
Brazilian institutional investors |  |  |
EQUITY |  |  |
Shares subscribed and paid up | 161,312,577 | 236,785,217 | 230,660,486
Ownership of shares, as a percentage of total issued shares | 9.60% | 13.80% | 13.40%
Brazilian institutional investors | Common shares |  |  |
EQUITY |  |  |
Shares subscribed and paid up | 4,292,172 | 4,363,438 | 3,397,955
Ownership of shares, as a percentage of total issued shares | 0.80% | 0.80% | 0.60%
Brazilian institutional investors | Preferred shares |  |  |
EQUITY |  |  |
Shares subscribed and paid up | 157,020,405 | 232,421,779 | 227,262,531
Ownership of shares, as a percentage of total issued shares | 14.30% | 20.30% | 19.80%
Foreign institutional investors |  |  |
EQUITY |  |  |
Shares subscribed and paid up | 522,514,717 | 492,705,610 | 495,218,544
Ownership of shares, as a percentage of total issued shares | 31.20% | 28.70% | 28.80%
Foreign institutional investors | Common shares |  |  |
EQUITY |  |  |
Shares subscribed and paid up | 1,529,109 | 1,895,038 | 3,142,148
Ownership of shares, as a percentage of total issued shares | 0.30% | 0.30% | 0.50%
Foreign institutional investors | Preferred shares |  |  |
EQUITY |  |  |
Shares subscribed and paid up | 520,985,608 | 490,810,572 | 492,076,396
Ownership of shares, as a percentage of total issued shares | 47.30% | 42.80% | 42.90%
Other shareholders |  |  |
EQUITY |  |  |
Shares subscribed and paid up | 421,834,145 | 418,357,118 | 415,235,701
Ownership of shares, as a percentage of total issued shares | 25.20% | 24.30% | 24.10%
Other shareholders | Common shares |  |  |
EQUITY |  |  |
Shares subscribed and paid up | 8,209,763 | 7,772,568 | 7,490,941
Ownership of shares, as a percentage of total issued shares | 1.40% | 1.40% | 1.30%
Other shareholders | Preferred shares |  |  |
EQUITY |  |  |
Shares subscribed and paid up | 413,624,382 | 410,584,550 | 407,744,760
Ownership of shares, as a percentage of total issued shares | 37.60% | 35.80% | 35.60%

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