XML 173 R151.htm IDEA: XBRL DOCUMENT
v3.23.1

EQUITY - Common and preferred shares outstanding (Details) - shares | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Common shares |  |  |
EQUITY |  |  |
Authorized capital | 1,500,000,000 |  |
Reconciliations of common and preferred outstanding shares |  |  |
Balance at beginning of the year | 571,929,945 | 571,929,945 | 571,929,945
Balance at end of year | 571,929,945 | 571,929,945 | 571,929,945
Preferred shares |  |  |
EQUITY |  |  |
Authorized capital | 3,000,000,000 |  |
Shares exercise period, excluding public offerings | 30 days |  |
Shares exercise period for public offering | 10 days |  |
Reconciliations of common and preferred outstanding shares |  |  |
Balance at beginning of the year | 1,133,816,901 | 1,129,231,487 | 1,127,010,827
Acquisition of Treasury shares | (44,564,000) |  |
Exercise of long-term incentive plan | 2,377,494 | 4,585,414 | 2,220,660
Balance at end of year | 1,091,630,395 | 1,133,816,901 | 1,129,231,487

X
- Definition The increase (decrease) in the number of shares outstanding resulting from exercise of stock options. + References No definition available. + Details
Name: | ggb_IncreaseDecreaseInNumberOfSharesOutstandingThroughExerciseOfStockOptions
Namespace Prefix: | ggb_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Maximum term of preference share rights for offering that is not a public offering. + References No definition available. + Details
Name: | ggb_PreferenceShareRightsExercisePeriodForOfferingThatIsNotPublic
Namespace Prefix: | ggb_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Term of preference share rights for public offering, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | ggb_PreferenceShareRightsExercisePeriodForPublicOffering
Namespace Prefix: | ggb_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The decrease in the number of shares outstanding resulting from purchase of treasury shares. + References No definition available. + Details
Name: | ggb_PurchaseOfTreasurySharesNumber
Namespace Prefix: | ggb_
Data Type: | xbrli:sharesItemType
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_DisclosureOfClassesOfShareCapitalLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of shares authorised. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2022-03-24 -Paragraph 79 -Subparagraph a -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_79_a_i&doctype=Standard -URIDate 2022-03-24 + Details
Name: | ifrs-full_NumberOfSharesAuthorised
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of shares that have been authorised and issued, reduced by treasury shares held. [Refer: Treasury shares] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2022-03-24 -Paragraph 79 -Subparagraph a -Clause iv -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_79_a_iv&doctype=Standard -URIDate 2022-03-24 + Details
Name: | ifrs-full_NumberOfSharesOutstanding
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- References No definition available. + Details
Name: | ifrs-full_ReconciliationOfNumberOfSharesOutstandingAbstract
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | ifrs-full_ClassesOfShareCapitalAxis=ifrs-full_OrdinarySharesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfShareCapitalAxis=ifrs-full_PreferenceSharesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |