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RELATED-PARTY TRANSACTIONS - Guarantees granted (Details) - Joint-venture - Financial guarantees - BRL (R$) R$ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Gerdau Corsa S.A.P.I de C.V. |  |  |
Guarantees granted |  |  |
Original Amount | R$ 4,905,367 |  |
Carrying Amount | 2,157,290 | R$ 2,242,865 | R$ 1,784,868
Gerdau Summit Acos Fundidos e Forjados S.A. |  |  |
Guarantees granted |  |  |
Original Amount | 130,164 |  |
Carrying Amount |  | R$ 30,125 | 37,285
Gerdau Metaldom S.A; Aceros Corsa S.A De C.V |  |  |
Guarantees granted |  |  |
Original Amount | R$ 274,560 |  |
Carrying Amount |  |  | R$ 241,842

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