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

X

- Definition

The amount of acquisition of book value of credit rights.

+ References

No definition available.

+ Details

Name:	ggb_BookValueOfAcquisitionOfCreditRights
Namespace Prefix:	ggb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

NA.

+ References

No definition available.

+ Details

Name:	ggb_ObligationsWithSecuritiesAndExchangeCommissionOfBrazilAndInvestmentFundInCreditRightsAbstract
Namespace Prefix:	ggb_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration