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Document And Entity Information - shares
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Document Information [Line Items]    
Entity Registrant Name Tenaris SA  
Document Type 20-F  
Amendment Flag false  
Document Registration Statement false  
Document Annual Report true  
Document Transition Report false  
Document Shell Company Report false  
Entity File Number 001-31518  
Entity Central Index Key 0001190723  
Current Fiscal Year End Date --12-31  
Document Period End Date Dec. 31, 2024  
Document Fiscal Year Focus 2024  
Document Fiscal Period Focus FY  
Entity Incorporation, State or Country Code N4  
Entity Address, Address Line One 26, Boulevard Royal – 4th Floor  
Entity Address, Postal Zip Code L-2449  
Entity Address, City or Town Luxembourg  
Entity Address, Country LU  
Entity Common Stock, Shares Outstanding (in shares) 1,162,757,528  
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  
Auditor Name Ernst & Young PricewaterhouseCoopers
Auditor Firm ID 1367 1328
Auditor Location Luxembourg Luxembourg
Document Financial Statement Error Correction [Flag] false  
Ternium S.A. [member]    
Document Information [Line Items]    
Auditor Name PricewaterhouseCoopers  
Auditor Firm ID 1328  
Auditor Location Luxembourg  
Business Contact    
Document Information [Line Items]    
Contact Personnel Name Marcos Basaldella  
Entity Address, Address Line One 26, Boulevard Royal – 4th Floor  
Entity Address, Postal Zip Code L-2449  
Entity Address, City or Town Luxembourg  
Entity Address, Country LU  
City Area Code 352  
Local Phone Number 26 47 89 78  
Treasury shares    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding (in shares) 78,485,337  
American Depositary Shares (“ADSs”)    
Document Information [Line Items]    
Title of 12(b) Security American Depositary Shares  
Trading Symbol TS  
Security Exchange Name NYSE  
Ordinary shares [member]    
Document Information [Line Items]    
Title of 12(b) Security Ordinary Shares, par value $1.00 per share  
Trading Symbol TS  
Security Exchange Name NYSE