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Document and Entity Information
 12 Months Ended
Dec. 31, 2021
shares
Document and Entity Information  
Entity Registrant Name GERDAU S.A.
Document Type 20-F
Document Registration Statement false
Document Annual Report true
Current Fiscal Year End Date --12-31
Document Period End Date Dec. 31, 2021
Document Transition Report false
Document Shell Company Report false
Entity File Number 1-14878
Entity Incorporation, State or Country Code D5
Entity Address, Address Line One Av. Dra. Ruth Cardoso
Entity Address, Address Line Two 8,501 – 8° floor
Entity Address, City or Town São Paulo
Entity Address, Country BR
Entity Address, Postal Zip Code 05425-070
Security Exchange Name NYSE
Entity Common Stock, Shares Outstanding 573,627,483
Entity Well-known Seasoned Issuer Yes
Entity Voluntary Filers No
Entity Current Reporting Status Yes
Entity Interactive Data Current Yes
Entity Filer Category Large Accelerated Filer
Entity Emerging Growth Company false
ICFR Auditor Attestation Flag true
Document Accounting Standard International Financial Reporting Standards
Entity Shell Company false
Entity Central Index Key 0001073404
Document Fiscal Year Focus 2021
Document Fiscal Period Focus FY
Amendment Flag false
Auditor Name KPMG Auditores Independentes Ltda
Auditor Firm ID 1124
Auditor Location Porto Alegre, Brazil
American Depositary Shares  
Document and Entity Information  
Title of 12(b) Security AmericanDepositary Shares