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EQUITY - Ownership of shares (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
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 13,911,882 18,497,296 20,717,956
Ownership of shares, as a percentage of total issued shares 0.80% 1.10% 1.20%
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 0.20% 0.30% 0.30%
Treasury Stocks | Preferred shares      
EQUITY      
Shares subscribed and paid up 12,214,344 16,799,758 19,020,418
Ownership of shares, as a percentage of total issued shares 1.10% 1.50% 1.70%
Metalurgica Gerdau S.A.      
EQUITY      
Shares subscribed and paid up 557,898,901 560,046,701 627,751,085
Ownership of shares, as a percentage of total issued shares 32.40% 32.60% 36.50%
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
Ownership of shares, as a percentage of total issued shares   0.20% 6.10%
Brazilian institutional investors      
EQUITY      
Shares subscribed and paid up 236,785,217 230,660,486 244,766,757
Ownership of shares, as a percentage of total issued shares 13.80% 13.40% 14.20%
Brazilian institutional investors | Common shares      
EQUITY      
Shares subscribed and paid up 4,363,438 3,397,955 3,068,614
Ownership of shares, as a percentage of total issued shares 0.80% 0.60% 0.50%
Brazilian institutional investors | Preferred shares      
EQUITY      
Shares subscribed and paid up 232,421,779 227,262,531 241,698,143
Ownership of shares, as a percentage of total issued shares 20.30% 19.80% 21.10%
Foreign institutional investors      
EQUITY      
Shares subscribed and paid up 492,705,610 495,218,544 431,611,203
Ownership of shares, as a percentage of total issued shares 28.70% 28.80% 25.10%
Foreign institutional investors | Common shares      
EQUITY      
Shares subscribed and paid up 1,895,038 3,142,148 3,875,655
Ownership of shares, as a percentage of total issued shares 0.30% 0.50% 0.70%
Foreign institutional investors | Preferred shares      
EQUITY      
Shares subscribed and paid up 490,810,572 492,076,396 427,735,548
Ownership of shares, as a percentage of total issued shares 42.80% 42.90% 37.30%
Other shareholders      
EQUITY      
Shares subscribed and paid up 418,357,118 415,235,701 394,811,727
Ownership of shares, as a percentage of total issued shares 24.30% 24.10% 23.00%
Other shareholders | Common shares      
EQUITY      
Shares subscribed and paid up 7,772,568 7,490,941 7,086,775
Ownership of shares, as a percentage of total issued shares 1.40% 1.30% 1.20%
Other shareholders | Preferred shares      
EQUITY      
Shares subscribed and paid up 410,584,550 407,744,760 387,724,952
Ownership of shares, as a percentage of total issued shares 35.80% 35.60% 33.80%