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v3.21.1

TAX, CIVIL AND LABOR CLAIMS AND CONTINGENT ASSETS - Contingent Assets (Details) R$ in Millions |  |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 30, 2020 BRL (R$) | Dec. 22, 2020 BRL (R$) | Jul. 03, 2020 BRL (R$) | Jun. 30, 2020 BRL (R$) | Dec. 31, 2020 BRL (R$) kW
TAX, CIVIL AND LABOR CLAIMS AND CONTINGENT ASSETS |  |  |  |  |
Minimum industrial consumers monthly electricity consumption limit (in Kilo watt hour) | kW |  |  |  |  | 2,000
Maximum period to return the compulsory loan to taxpayers |  |  |  |  | 20 years
Claims receivable from monetary correction of principal, interest, moratory and others due to compulsory loans |  |  |  |  | R$ 113.0
Gain on settlement of litigation, net of expenses incurred |  |  |  | R$ 436.0 |
Amounts raised | R$ 43.6 | R$ 39.7 | R$ 206.0 |  |
Amount of other pending lawsuits |  |  |  |  | R$ 1,350.0

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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
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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
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- Definition The amount recognized upon the settlement of litigation, net of expenses incurred. + References No definition available. + Details
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Namespace Prefix: | ggb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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_
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Balance Type: | na
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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
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- Definition The amount of other pending lawsuits. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The cash inflow from the settlement of litigation. + References No definition available. + Details
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Namespace Prefix: | ggb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration