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EQUITY - Ownership of shares (Details) - shares
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Capital      
Number of shares held 1,719,658,728 1,719,658,728 1,719,658,728
Shares Issued, Percentage 100.00% 100.00% 100.00%
Metalurgica Gerdau S.A.      
Capital      
Number of shares held 653,368,823 653,370,032 652,519,280
Shares Issued, Percentage 38.00% 38.00% 37.90%
Brazilian institutional investors      
Capital      
Number of shares held 226,456,754 155,482,209 134,604,327
Shares Issued, Percentage 13.20% 9.00% 7.80%
Foreign institutional investors      
Capital      
Number of shares held 415,223,778 715,363,943 716,775,213
Shares Issued, Percentage 24.10% 41.60% 41.80%
Other shareholders      
Capital      
Number of shares held 401,114,345 185,040,945 205,049,695
Shares Issued, Percentage 23.30% 10.80% 11.90%
Common shares      
Capital      
Number of shares held 573,627,483 573,627,483 573,627,483
Shares Issued, Percentage 100.00% 100.00% 100.00%
Common shares | Metalurgica Gerdau S.A.      
Capital      
Number of shares held 557,898,901 557,898,901 449,712,654
Shares Issued, Percentage 97.30% 97.30% 78.40%
Common shares | Brazilian institutional investors      
Capital      
Number of shares held 2,383,207 254,785 41,883,032
Shares Issued, Percentage 0.40% 0.00% 7.30%
Common shares | Foreign institutional investors      
Capital      
Number of shares held 4,836,488 7,254,556 11,122,498
Shares Issued, Percentage 0.80% 1.30% 1.90%
Common shares | Other shareholders      
Capital      
Number of shares held 6,811,349 6,521,703 69,211,761
Shares Issued, Percentage 1.20% 1.10% 12.10%
Preferred shares      
Capital      
Number of shares held 1,146,031,245 1,146,031,245 1,146,031,245
Shares Issued, Percentage 100.00% 100.00% 100.00%
Preferred shares | Metalurgica Gerdau S.A.      
Capital      
Number of shares held 95,469,922 95,471,131 202,806,626
Shares Issued, Percentage 8.30% 8.30% 17.70%
Preferred shares | Brazilian institutional investors      
Capital      
Number of shares held 224,073,547 155,227,424 92,721,295
Shares Issued, Percentage 19.60% 13.50% 8.10%
Preferred shares | Foreign institutional investors      
Capital      
Number of shares held 410,387,290 708,109,387 705,652,715
Shares Issued, Percentage 35.80% 61.80% 61.50%
Preferred shares | Other shareholders      
Capital      
Number of shares held 394,302,996 178,519,242 135,837,934
Shares Issued, Percentage 34.40% 15.60% 11.90%
Treasury Stocks      
Capital      
Number of shares held 23,495,028 10,401,599 10,710,213
Shares Issued, Percentage 1.40% 0.60% 0.60%
Treasury Stocks | Common shares      
Capital      
Number of shares held 1,697,538 1,697,538 1,697,538
Shares Issued, Percentage 0.30% 0.30% 0.30%
Treasury Stocks | Preferred shares      
Capital      
Number of shares held 21,797,490 8,704,061 9,012,675
Shares Issued, Percentage 1.90% 0.80% 0.80%