XML 136 R111.htm IDEA: XBRL DOCUMENT v3.24.1

FINANCIAL INSTRUMENTS - Sensitivity analysis (Details) - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Foreign currency risk
FINANCIAL INSTRUMENTS
Percentage of change	5.00%	5.00%
Foreign currency risk | Loans and Financing
FINANCIAL INSTRUMENTS
Percentage of change	5.00%	5.00%
Impact on income statement based on change in assumption	R$ 10,197	R$ (40,693)
Foreign currency risk | Imports/Exports
FINANCIAL INSTRUMENTS
Percentage of change	5.00%	5.00%
Impact on income statement based on change in assumption	R$ (28,929)	R$ (73,085)
Foreign currency risk | Swaps USD x DI
FINANCIAL INSTRUMENTS
Percentage of change	5.00%	5.00%
Impact on income statement based on change in assumption	R$ 7,604	R$ 0
Foreign currency risk | Swaps IPCA x DI
FINANCIAL INSTRUMENTS
Percentage of change	5.00%	5.00%
Impact on income statement based on change in assumption	R$ (152)	R$ 0
Foreign currency risk | Currency forward contracts
FINANCIAL INSTRUMENTS
Percentage of change	5.00%	5.00%
Impact on income statement based on change in assumption	R$ (8,311)	R$ 9,507
Interest rate risk
FINANCIAL INSTRUMENTS
Interest rate change (as a percent)	0.10%	0.10%
Impact on income statement based on change in assumption	R$ 29,939	R$ 32,377
Products sold price risk
FINANCIAL INSTRUMENTS
Percentage of change	1.00%	1.00%
Impact on income statement based on change in assumption	R$ 689,164	R$ 824,122
Raw materials and commodity price risk
FINANCIAL INSTRUMENTS
Percentage of change	1.00%	1.00%
Impact on income statement based on change in assumption	R$ 425,232	R$ 486,066
Commodity contracts
FINANCIAL INSTRUMENTS
Percentage of change	5.00%	5.00%
Impact on income statement based on change in assumption	R$ (2,850)	R$ 2,899

X

- Definition

Amount of impact on income statement based on the change in assumption in a sensitivity analysis.

+ References

No definition available.

+ Details

Name:	ggb_SensitivityAnalysisImpactOnIncomeStatementBasedOnChangeInAssumption
Namespace Prefix:	ggb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The interest rate change assumption used to calculate the income statement impact in a sensitivity analysis.

+ References

No definition available.

+ Details

Name:	ggb_SensitivityAnalysisInterestRateChangeAssumption
Namespace Prefix:	ggb_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The percentage of change assumption used to calculate the income statement impact in a sensitivity analysis.

+ References

No definition available.

+ Details

Name:	ggb_SensitivityAnalysisPercentageOfChangeAssumption
Namespace Prefix:	ggb_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- 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_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsLineItems
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	ifrs-full_TypesOfRisksAxis=ifrs-full_CurrencyRiskMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ClassesOfFinancialInstrumentsAxis=ggb_LoansAndFinancingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ClassesOfFinancialInstrumentsAxis=ggb_ImportsOrExportsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ClassesOfFinancialInstrumentsAxis=ggb_SwapContractUsDollarUsdXDiMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ClassesOfFinancialInstrumentsAxis=ggb_SwapContractBoardConsumerPriceIndexIpcaXDiMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ClassesOfFinancialAssetsAxis=ifrs-full_ForwardContractMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_TypesOfRisksAxis=ifrs-full_InterestRateRiskMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_TypesOfRisksAxis=ggb_ProductsSoldPriceRiskMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_TypesOfRisksAxis=ggb_RawMaterialsAndCommodityPriceRiskMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_TypesOfRisksAxis=ifrs-full_CommodityPriceRiskMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: