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EQUITY - Reserves (Details)	12 Months Ended
	Dec. 31, 2021
EQUITY.
Minimum legal reserve transfer as a percentage of net income	5.00%
Maximum legal reserve balance as a percentage of total paid-in capital	20.00%
Investments and working capital reserve, annual percentage	5.00%

X

- Definition

The percentage of annual profits which may be transferred to the Investments and Working Capital Reserve if proposed by the Board of Directors and approved by shareholders.

+ References

No definition available.

+ Details

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Namespace Prefix:	ggb_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The maximum amount of legal reserves, as a percentage of total paid-in capital.

+ References

No definition available.

+ Details

Name:	ggb_LegalReservesMaximumReserveBalanceAsPercentageOfTotalPaidInCapital
Namespace Prefix:	ggb_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The minimum mandatory amount of earnings to be transferred into legal reserves, as a percentage of annual net income.

+ References

No definition available.

+ Details

Name:	ggb_LegalReservesMinimumAnnualTransferAsPercentageOfAnnualNetIncome
Namespace Prefix:	ggb_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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