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Cover
 12 Months Ended
Dec. 31, 2024
shares
Document Information [Line Items]  
Document Type 20-F
Document Registration Statement false
Document Annual Report true
Document Transition Report false
Document Financial Statement Error Correction [Flag] false
Document Shell Company Report false
Entity Interactive Data Current Yes
Document Accounting Standard International Financial Reporting Standards
ICFR Auditor Attestation Flag true
Amendment Flag false
Document Period End Date Dec. 31, 2024
Document Fiscal Year Focus 2024
Document Fiscal Period Focus FY
Entity Information [Line Items]  
Entity Registrant Name GRUPO SIMEC, S.A.B. de C.V.
Entity Central Index Key 0000887153
Entity File Number 1-11176
Entity Incorporation, State or Country Code O5
Current Fiscal Year End Date --12-31
Entity Well-known Seasoned Issuer No
Entity Voluntary Filers No
Entity Current Reporting Status No
Entity Shell Company false
Entity Filer Category Large Accelerated Filer
Entity Emerging Growth Company false
Entity Contact Personnel [Line Items]  
Entity Address, Address Line One Calzada Lázaro Cárdenas 601 Colonia La Nogalera
Entity Address, Address Line Two Guadalajara
Entity Address, City or Town Jalisco
Entity Address, Country MX
Entity Address, Postal Zip Code 44440
Entity Listings [Line Items]  
Entity Common Stock, Shares Outstanding 461,004,869
American Depositary Shares  
Entity Listings [Line Items]  
Title of 12(b) Security American Depositary Shares (each representing three Series B shares)
Trading Symbol SIM
Security Exchange Name NYSEAMER
Series B Common Stock  
Entity Listings [Line Items]  
Title of 12(b) Security Series B Common Stock
No Trading Symbol Flag true
Security Exchange Name NYSEAMER
Business Contact [Member]  
Entity Contact Personnel [Line Items]  
Contact Personnel Name Mario Moreno Cortez
Contact Personnel Email Address mmoreno@gruposimec.com.mx
Entity Address, Address Line One Calzada Lázaro Cárdenas 601Colonia La Nogalera
Entity Address, Address Line Two Guadalajara
Entity Address, City or Town Jalisco
Entity Address, Country MX
Entity Address, Postal Zip Code 44440
Entity Phone Fax Numbers [Line Items]  
City Area Code (5233)
Local Phone Number 3770-6700