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PROPERTY, PLANT AND EQUIPMENT - Impairment and non cash effect (Details) - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
PROPERTY, PLANT AND EQUIPMENT
Impairment of property, plant and equipment	R$ 0	R$ 0	R$ 0
Non cash effect on addition in Property Plant and Equipment	474,369
Land and buildings
PROPERTY, PLANT AND EQUIPMENT
Carrying value of impaired assets	281,560	316,348
Machines, equipment, and installations
PROPERTY, PLANT AND EQUIPMENT
Carrying value of impaired assets	339,236	476,602
Property, plant and equipment under construction
PROPERTY, PLANT AND EQUIPMENT
Carrying value of impaired assets	R$ 543,726	R$ 543,726

X

- Definition

The non cash effect due to asset additions during the period.

+ References

No definition available.

+ Details

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

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- 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

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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 2023-01-01
-Paragraph 73
-Subparagraph e
-Clause v
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=16&code=ifrs-tx-2023-en-r&anchor=para_73_e_v&doctype=Standard
-URIDate 2023-03-23

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2023-01-01
-Paragraph 98
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_98_a&doctype=Standard
-URIDate 2023-03-23

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X

- Definition

The amount of property, plant and equipment stated at revalued amounts. [Refer: Property, plant and equipment]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 16
-IssueDate 2023-01-01
-Paragraph 77
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=16&code=ifrs-tx-2023-en-r&anchor=para_77&doctype=Standard
-URIDate 2023-03-23

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- Details

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- Details

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X

- Details

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Namespace Prefix:
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