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RELATED-PARTY TRANSACTIONS - Intercompany loans (Details) - BRL (R$) R$ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
RELATED PARTY TRANSACTIONS |  |  |
Assets | R$ 2,678 | R$ 134,354 |
Liabilities | (24,648) | (22,855) |
Net financial income | 6,089 | 8,277 | R$ 4,767
Fundacao Gerdau |  |  |
RELATED PARTY TRANSACTIONS |  |  |
Assets | 2,678 | 17,262 |
Gerdau Corsa S.A.P.I de C.V. |  |  |
RELATED PARTY TRANSACTIONS |  |  |
Assets |  | 117,092 |
Bradley Steel Processors |  |  |
RELATED PARTY TRANSACTIONS |  |  |
Liabilities | R$ (24,648) | R$ (22,855) |

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