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EMPLOYEE BENEFITS - Defined benefit pension plan - Allocation of plan assets (Details) | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Brazilian Plans |  |
Allocation for plan assets |  |
Fixed income | 99.20% | 99.10%
Others | 0.80% | 0.90%
Total | 100.00% | 100.00%
American Plans |  |
Allocation for plan assets |  |
Fixed income | 50.40% | 46.60%
Variable income | 43.00% | 47.10%
Others | 6.60% | 6.30%
Total | 100.00% | 100.00%
Defined benefit pension plan |  |
Allocation for plan assets |  |
Target allocation of shares (as a percent) | 50.00% |
Target allocation of debt securities (as a percent) | 40.00% |
Target allocation of alternative securities (as a percent) | 10.00% |

X
- Definition Target allocation range in alternative securities, in a defined benefit plan, represented as a percentage. + References No definition available. + Details
Name: | ggb_AllocationForPlanAllocationRangeForAlternativeSecuritiesPercentage
Namespace Prefix: | ggb_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Target allocation range in debt securities, in a defined benefit plan, represented as a percentage. + References No definition available. + Details
Name: | ggb_AllocationForPlanAllocationRangeForDebtSecuritiesPercentage
Namespace Prefix: | ggb_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Target allocation range in shares, in a defined benefit plan, represented as a percentage. + References No definition available. + Details
Name: | ggb_AllocationForPlanAllocationRangeForSharesPercentage
Namespace Prefix: | ggb_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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

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- Definition Allocation of plan assets, in a defined benefit plan, represented by fixed income percentage. + References No definition available. + Details
Name: | ggb_AllocationForPlanFixedIncomePercentage
Namespace Prefix: | ggb_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Allocation of plan assets, in a defined benefit plan, represented by other percentages. + References No definition available. + Details
Name: | ggb_AllocationForPlanOthersPercentage
Namespace Prefix: | ggb_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Allocation of plan assets, in a defined benefit plan, represented as a percentage. + References No definition available. + Details
Name: | ggb_AllocationForPlanPercentage
Namespace Prefix: | ggb_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Allocation of plan assets, in a defined benefit plan, represented by variable income percentage. + References No definition available. + Details
Name: | ggb_AllocationForPlanVariableIncomePercentage
Namespace Prefix: | ggb_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_CharacteristicsOfDefinedBenefitPlansAxis=ggb_BrazilianPostEmploymentDefinedBenefitPensionPlansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_CharacteristicsOfDefinedBenefitPlansAxis=ggb_NorthAmericanPostEmploymentDefinedBenefitPensionPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_DefinedBenefitPlansAxis=ifrs-full_DefinedBenefitPlansOtherThanMultiemployerPlansStatePlansAndPlansThatShareRisksBetweenEntitiesUnderCommonControlMember
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Data Type: | na
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