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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

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