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OBLIGATIONS WITH FIDC - INVESTMENT FUND IN CREDIT RIGHTS (Details) - BRL (R$) R$ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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OBLIGATIONS WITH FIDC - INVESTMENT FUND IN CREDIT RIGHTS |  |
Current obligations with FIDC | R$ 45,497 | R$ 944,513
Non-current obligations with FIDC | 0 | R$ 42,893
Book value of acquistion of credit rights | R$ 954,916 |

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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Current portion of amounts payable regarding repurchase receivables from the Credit Right Investment Fund. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Noncurrent portion of amounts payable regarding repurchase receivables from the Credit Right Investment Fund. + References No definition available. + Details
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Namespace Prefix: | ggb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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