XML 92 R67.htm IDEA: XBRL DOCUMENT
v3.22.1

CONSOLIDATED FINANCIAL STATEMENTS - Results in operations with subsidiary and joint ventures (Details) - BRL (R$) R$ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure of Significant Investments in Subsidiary and Joint Ventures [Line Items] |  |  |
Recycling to income of the cumulative translation adjustments | R$ (193,334) | R$ 0 | R$ 0
Write-off of goodwill | (549,898) |  |
Results in operations with subsidiary and joint ventures | (162,913) | R$ 0 | R$ 0
Gerdau Corsa S.A.P.I de C.V. | North America Operation |  |  |
Disclosure of Significant Investments in Subsidiary and Joint Ventures [Line Items] |  |  |
Write-off of goodwill | 549,898 |  |
Results in operations with subsidiary and joint ventures | R$ 162,913 |  |
Gerdau Corsa S.A.P.I de C.V. | Minimum |  |  |
Disclosure of Significant Investments in Subsidiary and Joint Ventures [Line Items] |  |  |
Equity Interests (as a percent) | 70.00% |  |
Gerdau Corsa S.A.P.I de C.V. | Maximum |  |  |
Disclosure of Significant Investments in Subsidiary and Joint Ventures [Line Items] |  |  |
Equity Interests (as a percent) | 75.00% |  |
Sidertul, S.A. de C.V. |  |  |
Disclosure of Significant Investments in Subsidiary and Joint Ventures [Line Items] |  |  |
Gain due to the fair value adjustment of the interest held | R$ 193,651 |  |
Recycling to income of the cumulative translation adjustments | R$ 193,334 |  |

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: | ggb_DisclosureOfSignificantInvestmentsInSubsidiaryAndJointVenturesLineItems
Namespace Prefix: | ggb_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The gains (losses) from changes in the fair value of equity method investments. + References No definition available. + Details
Name: | ggb_GainsLossesOnFairValueAdjustmentEquityMethodInvestments
Namespace Prefix: | ggb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of increase (decrease) through Results in Operations with Subsidiary and Joint Ventures, Goodwill. + References No definition available. + Details
Name: | ggb_IncreaseDecreaseThroughResultsInOperationsWithSubsidiaryAndJointVenturesGoodwill
Namespace Prefix: | ggb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The proportion of ownership interest in a joint operation attributable to the entity. [Refer: Joint operations [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2021-01-01 -Paragraph 21 -Subparagraph a -Clause iv -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2021-en-r&anchor=para_21_a_iv&doctype=Standard -URIDate 2021-03-24 + Details
Name: | ifrs-full_ProportionOfOwnershipInterestInJointOperation
Namespace Prefix: | ifrs-full_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of reclassification adjustments related to exchange differences when the financial statements of foreign operations are translated, net of tax. Reclassification adjustments are amounts reclassified to profit (loss) in the current period that were recognised in other comprehensive income in the current or previous periods. [Refer: Other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 21 -IssueDate 2021-01-01 -Paragraph 48 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=21&code=ifrs-tx-2021-en-r&anchor=para_48&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 92 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_92&doctype=Standard -URIDate 2021-03-24 + Details
Name: | ifrs-full_ReclassificationAdjustmentsOnExchangeDifferencesOnTranslationNetOfTax
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The entity's share of the profit (loss) of associates and joint ventures accounted for using the equity method. [Refer: Associates [member]; Investments accounted for using equity method; Joint ventures [member]; Profit (loss)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2021-01-01 -Paragraph 23 -Subparagraph g -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2021-en-r&anchor=para_23_g&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2021-01-01 -Paragraph 28 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2021-en-r&anchor=para_28_e&doctype=Standard -URIDate 2021-03-24 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Note Effective on first application of IFRS 9 -Name IFRS -Number 4 -IssueDate 2021-01-01 -Paragraph 39M -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=4&code=ifrs-tx-2021-en-b&anchor=para_39M_b&doctype=Standard -URIDate 2021-03-24 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 82 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_82_c&doctype=Standard -URIDate 2021-03-24 + Details
Name: | ifrs-full_ShareOfProfitLossOfAssociatesAndJointVenturesAccountedForUsingEquityMethod
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=ggb_GerdauCorsaSapiDeCvMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SegmentsAxis=ggb_NorthAmericaSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_RangeAxis=ifrs-full_BottomOfRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_RangeAxis=ifrs-full_TopOfRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=ggb_SidertulS.a.DeC.v.Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |