XML 107 R90.htm IDEA: XBRL DOCUMENT
v3.20.1

PROPERTY, PLANT AND EQUIPMENT - Cost (Details) - BRL (R$) R$ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
PROPERTY, PLANT AND EQUIPMENT |  |  |  |
Balance, beginning of period |  | R$ 15,546,481 | R$ 16,443,742 |
Impairment | R$ (265,369) | 0 | 0 |
Balance, end of period | 16,443,742 | 15,901,493 | 15,546,481 | R$ 16,443,742
Gross |  |  |  |
PROPERTY, PLANT AND EQUIPMENT |  |  |  |
Balance, beginning of period |  | 41,072,186 | 39,940,317 | 44,001,599
Additions |  | 1,746,600 | 1,194,934 | 873,329
Capitalized interest |  | 24,676 | 23,999 | 44,260
Disposals |  | (367,685) | (349,749) | (513,472)
Loss of control by selling of subsidiary |  |  |  | (1,091,705)
Impairment |  |  |  | (265,369)
Transfer to assets held for sale |  |  | (1,899,000) | (4,080,785)
Effects of IAS 29 adoption |  |  | 699,724 |
Foreign exchange effect |  | 816,060 | 1,461,961 | 972,460
Balance, end of period | 39,940,317 | 43,291,837 | 41,072,186 | 39,940,317
Land and buildings |  |  |  |
PROPERTY, PLANT AND EQUIPMENT |  |  |  |
Balance, beginning of period |  | 4,518,944 | 5,170,675 |
Balance, end of period | 5,170,675 | 4,399,481 | 4,518,944 | 5,170,675
Land and buildings | Gross |  |  |  |
PROPERTY, PLANT AND EQUIPMENT |  |  |  |
Balance, beginning of period |  | 8,700,749 | 9,085,698 | 9,483,753
Additions |  | 28,449 | 13,739 | 2,028
Transfers |  | 115,452 | 140,334 | 700,318
Disposals |  | (54,699) | (45,290) | (157,625)
Loss of control by selling of subsidiary |  |  |  | (119,928)
Impairment |  |  |  | (10,063)
Transfer to assets held for sale |  |  | (784,464) | (1,013,466)
Foreign exchange effect |  | 122,992 | 290,732 | 200,681
Balance, end of period | 9,085,698 | 8,912,943 | 8,700,749 | 9,085,698
Machines, equipment, and installations |  |  |  |
PROPERTY, PLANT AND EQUIPMENT |  |  |  |
Balance, beginning of period |  | 9,242,177 | 9,439,768 |
Balance, end of period | 9,439,768 | 9,189,797 | 9,242,177 | 9,439,768
Machines, equipment, and installations | Gross |  |  |  |
PROPERTY, PLANT AND EQUIPMENT |  |  |  |
Balance, beginning of period |  | 29,608,998 | 28,016,604 | 30,633,880
Additions |  | 76,756 | 66,764 | 124,136
Transfers |  | 884,161 | 802,664 | 716,685
Disposals |  | (165,139) | (285,860) | (232,771)
Loss of control by selling of subsidiary |  |  |  | (900,840)
Impairment |  |  |  | (255,293)
Transfer to assets held for sale |  |  | (749,425) | (2,734,923)
Effects of IAS 29 adoption |  |  | 699,724 |
Foreign exchange effect |  | 626,432 | 1,058,527 | 665,730
Balance, end of period | 28,016,604 | 31,031,208 | 29,608,998 | 28,016,604
Data electronic equipment |  |  |  |
PROPERTY, PLANT AND EQUIPMENT |  |  |  |
Balance, beginning of period |  | 66,132 | 89,404 |
Balance, end of period | 89,404 | 72,127 | 66,132 | 89,404
Data electronic equipment | Gross |  |  |  |
PROPERTY, PLANT AND EQUIPMENT |  |  |  |
Balance, beginning of period |  | 753,078 | 711,638 | 762,074
Additions |  | 13,955 | 11,811 | 1,770
Transfers |  | 24,037 | 457 | 19,340
Disposals |  | (1,890) | (5,641) | (12,963)
Loss of control by selling of subsidiary |  |  |  | (16,426)
Transfer to assets held for sale |  |  | (14,914) | (53,315)
Foreign exchange effect |  | 13,369 | 49,727 | 11,158
Balance, end of period | 711,638 | 802,549 | 753,078 | 711,638
Property, plant and equipment under construction |  |  |  |
PROPERTY, PLANT AND EQUIPMENT |  |  |  |
Balance, beginning of period |  | 1,021,247 | 950,680 |
Balance, end of period | 950,680 | 1,515,729 | 1,021,247 | 950,680
Property, plant and equipment under construction | Gross |  |  |  |
PROPERTY, PLANT AND EQUIPMENT |  |  |  |
Balance, beginning of period |  | 1,021,247 | 950,680 | 1,762,648
Additions |  | 1,506,343 | 983,519 | 687,019
Capitalized interest |  | 24,676 | 23,999 | 44,260
Transfers |  | (1,038,693) | (949,888) | (1,440,183)
Disposals |  | (40,314) | (3,352) | (60,151)
Loss of control by selling of subsidiary |  |  |  | (1,382)
Transfer to assets held for sale |  |  | (49,579) | (107,677)
Foreign exchange effect |  | 42,470 | 65,868 | 66,146
Balance, end of period | 950,680 | 1,515,729 | 1,021,247 | 950,680
Other |  |  |  |
PROPERTY, PLANT AND EQUIPMENT |  |  |  |
Balance, beginning of period |  | 697,981 | 793,215 |
Balance, end of period | 793,215 | 724,359 | 697,981 | 793,215
Other | Gross |  |  |  |
PROPERTY, PLANT AND EQUIPMENT |  |  |  |
Balance, beginning of period |  | 988,114 | 1,175,697 | 1,359,244
Additions |  | 121,097 | 119,101 | 58,376
Transfers |  | 15,043 | 6,433 | 3,840
Disposals |  | (105,643) | (9,606) | (49,962)
Loss of control by selling of subsidiary |  |  |  | (53,129)
Impairment |  |  |  | (13)
Transfer to assets held for sale |  |  | (300,618) | (171,404)
Foreign exchange effect |  | 10,797 | (2,893) | 28,745
Balance, end of period | R$ 1,175,697 | R$ 1,029,408 | R$ 988,114 | R$ 1,175,697

X
- Definition The decrease in plant, property and equipment through transfer to assets held for sale. + References No definition available. + Details
Name: | ggb_DecreaseThroughTransferToAssetsClassifiedAsHeldForSalePropertyPlantAndEquipment
Namespace Prefix: | ggb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The increase (decrease) in property, plant and equipment resulting from effects of IAS 29 adoption. + References No definition available. + Details
Name: | ggb_IncreaseDecreaseThroughEffectsOfIas29AdoptionPropertyPlantAndEquipment
Namespace Prefix: | ggb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of additions to property, plant and equipment other than those acquired through business combinations. [Refer: Business combinations [member]; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2019-01-01 -Paragraph 73 -Subparagraph e -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2019-en-r&anchor=para_73_e_i&doctype=Standard -URIDate 2019-03-27 + Details
Name: | ifrs-full_AdditionsOtherThanThroughBusinessCombinationsPropertyPlantAndEquipment
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The decrease in property, plant and equipment resulting from the loss of control of a subsidiary. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 16 -IssueDate 2019-01-01 -Paragraph 73 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2019-en-r&anchor=para_73_e&doctype=Standard -URIDate 2019-03-27 + Details
Name: | ifrs-full_DecreaseThroughLossOfControlOfSubsidiaryPropertyPlantAndEquipment
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
Name: | ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The decrease in property, plant and equipment resulting from disposals. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2019-01-01 -Paragraph 73 -Subparagraph e -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2019-en-r&anchor=para_73_e_ii&doctype=Standard -URIDate 2019-03-27 + Details
Name: | ifrs-full_DisposalsPropertyPlantAndEquipment
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of impairment loss recognised in profit or loss for property, plant and equipment. [Refer: Impairment loss recognised in profit or loss; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2019-01-01 -Paragraph 73 -Subparagraph e -Clause v -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2019-en-r&anchor=para_73_e_v&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 98 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_98_a&doctype=Standard -URIDate 2019-03-27 + Details
Name: | ifrs-full_ImpairmentLossRecognisedInProfitOrLossPropertyPlantAndEquipment
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- Definition The increase (decrease) in property, plant and equipment resulting from net exchange differences arising on the translation of the financial statements from the functional currency into a different presentation currency, including the translation of a foreign operation into the presentation currency of the reporting entity. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2019-01-01 -Paragraph 73 -Subparagraph e -Clause viii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2019-en-r&anchor=para_73_e_viii&doctype=Standard -URIDate 2019-03-27 + Details
Name: | ifrs-full_IncreaseDecreaseThroughNetExchangeDifferencesPropertyPlantAndEquipment
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The increase (decrease) in property, plant and equipment resulting from transfers. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 16 -IssueDate 2019-01-01 -Paragraph 73 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2019-en-r&anchor=para_73_e&doctype=Standard -URIDate 2019-03-27 + Details
Name: | ifrs-full_IncreaseDecreaseThroughTransfersPropertyPlantAndEquipment
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of interest costs that an entity incurs in connection with the borrowing of funds that are directly attributable to the acquisition, construction or production of a qualifying asset and which form part of the cost of that asset. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_112_c&doctype=Standard -URIDate 2019-03-27 + Details
Name: | ifrs-full_InterestCostsCapitalised
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of tangible assets that: (a) are held for use in the production or supply of goods or services, for rental to others, or for administrative purposes; and (b) are expected to be used during more than one period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2019-01-01 -Paragraph 73 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2019-en-r&anchor=para_73_e&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 54 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_54_a&doctype=Standard -URIDate 2019-03-27 + Details
Name: | ifrs-full_PropertyPlantAndEquipment
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis=ifrs-full_GrossCarryingAmountMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=ifrs-full_LandAndBuildingsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=ifrs-full_MachineryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=ggb_DataElectronicEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=ifrs-full_ConstructionInProgressMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=ifrs-full_OtherPropertyPlantAndEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |