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EQUITY - Ownership of shares (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
EQUITY      
Shares subscribed and paid up 1,719,658,728 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 573,627,483 573,627,483 573,627,483
Ownership of shares, as a percentage of total issued shares 100.00% 100.00% 100.00%
Preferred shares      
EQUITY      
Shares subscribed and paid up 1,146,031,245 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 18,497,296 20,717,956 23,495,028
Ownership of shares, as a percentage of total issued shares 1.10% 1.20% 1.40%
Treasury Stocks | Common shares      
EQUITY      
Shares subscribed and paid up 1,697,538 1,697,538 1,697,538
Ownership of shares, as a percentage of total issued shares 0.30% 0.30% 0.30%
Treasury Stocks | Preferred shares      
EQUITY      
Shares subscribed and paid up 16,799,758 19,020,418 21,797,490
Ownership of shares, as a percentage of total issued shares 1.50% 1.70% 1.90%
Metalurgica Gerdau S.A.      
EQUITY      
Shares subscribed and paid up 560,046,701 627,751,085 653,368,823
Ownership of shares, as a percentage of total issued shares 32.60% 36.50% 38.00%
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 97.30% 97.30% 97.30%
Metalurgica Gerdau S.A. | Preferred shares      
EQUITY      
Shares subscribed and paid up 2,147,800 69,852,184 95,469,922
Ownership of shares, as a percentage of total issued shares 0.20% 6.10% 8.30%
Brazilian institutional investors      
EQUITY      
Shares subscribed and paid up 230,660,486 244,766,757 226,456,754
Ownership of shares, as a percentage of total issued shares 13.40% 14.20% 13.20%
Brazilian institutional investors | Common shares      
EQUITY      
Shares subscribed and paid up 3,397,955 3,068,614 2,383,207
Ownership of shares, as a percentage of total issued shares 0.60% 0.50% 0.40%
Brazilian institutional investors | Preferred shares      
EQUITY      
Shares subscribed and paid up 227,262,531 241,698,143 224,073,547
Ownership of shares, as a percentage of total issued shares 19.80% 21.10% 19.60%
Foreign institutional investors      
EQUITY      
Shares subscribed and paid up 495,218,544 431,611,203 415,223,778
Ownership of shares, as a percentage of total issued shares 28.80% 25.10% 24.10%
Foreign institutional investors | Common shares      
EQUITY      
Shares subscribed and paid up 3,142,148 3,875,655 4,836,488
Ownership of shares, as a percentage of total issued shares 0.50% 0.70% 0.80%
Foreign institutional investors | Preferred shares      
EQUITY      
Shares subscribed and paid up 492,076,396 427,735,548 410,387,290
Ownership of shares, as a percentage of total issued shares 42.90% 37.30% 35.80%
Other shareholders      
EQUITY      
Shares subscribed and paid up 415,235,701 394,811,727 401,114,345
Ownership of shares, as a percentage of total issued shares 24.10% 23.00% 23.30%
Other shareholders | Common shares      
EQUITY      
Shares subscribed and paid up 7,490,941 7,086,775 6,811,349
Ownership of shares, as a percentage of total issued shares 1.30% 1.20% 1.20%
Other shareholders | Preferred shares      
EQUITY      
Shares subscribed and paid up 407,744,760 387,724,952 394,302,996
Ownership of shares, as a percentage of total issued shares 35.60% 33.80% 34.40%