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v3.23.1

SHORT-TERM DEBT AND LONG-TERM DEBT - Additional disclosures (Details) - Dec. 31, 2022 R$ in Millions, $ in Millions | USD ($) | BRL (R$)
--- | --- | ---
Global Credit Line |  |
LOANS AND FINANCING |  |
Maximum borrowing capacity | $ 875 | R$ 4,565

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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References No definition available. + Details
Name: | ggb_IfrsLineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | ggb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
Name: | ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_BorrowingsByNameAxis=ggb_GlobalCreditLineMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |