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CONSOLIDATED FINANCIAL STATEMENTS - Results in operations with subsidiary and joint ventures (Details) - BRL (R$)
R$ in Thousands
12 Months Ended
Dec. 01, 2021
Nov. 30, 2021
Dec. 31, 2022
Dec. 31, 2021
CONSOLIDATED FINANCIAL STATEMENTS        
Recycling to income of the cumulative translation adjustments     R$ (13,239) R$ (193,334)
Write-off of goodwill       (549,898)
Results in operations with subsidiary and joint ventures       (162,913)
North America Operation        
CONSOLIDATED FINANCIAL STATEMENTS        
Write-off of goodwill       549,898
Results in operations with subsidiary and joint ventures       162,913
Gerdau Corsa S.A.P.I de C.V.        
CONSOLIDATED FINANCIAL STATEMENTS        
Equity Interests (as a percent) 75.00% 70.00%    
Sidertul, S.A. de C.V.        
CONSOLIDATED FINANCIAL STATEMENTS        
Gain due to the fair value adjustment of the interest held       193,651
Recycling to income of the cumulative translation adjustments       R$ 193,334