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EQUITY - Ownership of shares (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
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%