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EARNINGS (LOSS) PER SHARE (EPS) - Diluted (Details) - BRL (R$)
R$ / shares in Units, R$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Allocated net income available to Common and Preferred shareholders      
Net income R$ 15,494,111 R$ 2,365,763 R$ 1,203,736
Weighted - average number of shares outstanding      
Earnings per share - Diluted (Common and Preferred Shares) R$ 9.04 R$ 1.38 R$ 0.70
Common shares      
Allocated net income available to Common and Preferred shareholders      
Net income R$ 5,198,011 R$ 795,617 R$ 405,607
Adjustment to net income allocated to preferred shareholders in respect to the potential increase in number of preferred shares outstanding, as a result of long-term incentive plans of Gerdau. (26,192) (4,782) (2,884)
Net income available to owners of parent including effects of dilutive shares R$ 5,171,819 R$ 790,835 R$ 402,723
Weighted - average number of shares outstanding      
Weighted-average number of shares outstanding 571,929,945 571,929,945 571,929,945
Preferred shares      
Allocated net income available to Common and Preferred shareholders      
Net income R$ 10,296,100 R$ 1,570,146 R$ 798,129
Adjustment to net income allocated to preferred shareholders in respect to the potential increase in number of preferred shares outstanding, as a result of long-term incentive plans of Gerdau. 26,192 5,524 2,884
Net income available to owners of parent including effects of dilutive shares R$ 10,322,292 R$ 1,575,670 R$ 801,013
Weighted - average number of shares outstanding      
Weighted-average number of shares outstanding 1,132,865,567 1,128,700,478 1,125,408,180
Potential increase in number of preferred shares outstanding in respect of long-term incentive plan of Gerdau 8,633,716 10,821,083 12,157,614
Total 1,141,499,283 1,139,521,561 1,137,565,794