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SHORT-TERM DEBT AND LONG-TERM DEBT - Principal and Interest (Details) - BRL (R$) R$ in Thousands	Dec. 31, 2020	Dec. 31, 2019
SHORT-TERM DEBT AND LONG-TERM DEBT
Principal amount of loans and Financing	R$ 14,413,188	R$ 12,958,565
Interest accrued of loans and Financing	199,746	180,258
Total Loans and Financing	R$ 14,612,934	R$ 13,138,823

X

- Definition

The amount of outstanding funds that the entity is obligated to repay, excluding notes and debentures.

+ References

No definition available.

+ Details

Name:	ggb_BorrowingsExcludingNotesAndDebentures
Namespace Prefix:	ggb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of borrowings, excluding notes and debentures.

+ References

No definition available.

+ Details

Name:	ggb_BorrowingsExcludingNotesAndDebenturesGross
Namespace Prefix:	ggb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsAbstract
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of interest recognised as a liability.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2020-01-01
-Paragraph 112
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_112_c&doctype=Standard
-URIDate 2020-01-01

+ Details

Name:	ifrs-full_InterestPayable
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant