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TAX, CIVIL AND LABOR CLAIMS AND CONTINGENT ASSETS - Contingent Assets (Details) R$ in Millions | 12 Months Ended
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Dec. 31, 2018 BRL (R$) kW
TAX, CIVIL AND LABOR CLAIMS AND CONTINGENT ASSETS |
Minimum industrial consumers monthly electricity consumption limit (in Kilo watt hour) | kW | 2,000
Maximum period to return the compulsory loan to taxpayers | 20 years
Claims receivable from monetary correction of principal, interest, moratory and others due to compulsory loans | R$ | R$ 1,260

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- Definition It represents the claims receivable from monetary correction of principal, interest, moratory and other accessory amounts owed due to compulsory loans. + References No definition available. + Details
Name: | ggb_ClaimsReceivableFromMonetaryCorrectionOfPrincipalInterestMoratoryAndOthers
Namespace Prefix: | ggb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | ggb_DisclosureOfTaxCivilAndLaborClaimsAndContingentAssetsAbstract
Namespace Prefix: | ggb_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition It represents the maximum Period for returning of compulsory loan + References No definition available. + Details
Name: | ggb_MaximumPeriodForReturningOfCompulsoryLoan
Namespace Prefix: | ggb_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition It represents the minimum Industrial consumers monthly electricity consumption limit for instituting compulsory loan. + References No definition available. + Details
Name: | ggb_MinimumIndustrialConsumersMonthlyElectricityConsumptionLimit
Namespace Prefix: | ggb_
Data Type: | num:powerItemType
Balance Type: | na
Period Type: | duration