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OBLIGATIONS WITH FIDC - INVESTMENT FUND IN CREDIT RIGHTS (Details) - BRL (R$) R$ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
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OBLIGATIONS WITH FIDC - INVESTMENT FUND IN CREDIT RIGHTS |  |
Investment fund in credit rights | R$ 0 | R$ 45,497

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- Definition The amount of acquisition of book value of credit rights. + References No definition available. + Details
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Namespace Prefix: | ggb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition NA. + References No definition available. + Details
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Namespace Prefix: | ggb_
Data Type: | xbrli:stringItemType
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Period Type: | duration