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Note 27 - Contingencies, commitments and restrictions on the distribution of profits (Details Textual)
R$ / shares in Units, R$ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2023
BRL (R$)
Dec. 31, 2022
Oct. 27, 2022
Oct. 09, 2018
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2023
USD ($)
Jun. 24, 2022
USD ($)
Oct. 10, 2018
BRL (R$)
Oct. 10, 2018
USD ($)
Jan. 31, 2012
Subsidiaries
R$ / shares
shares
Contingencies, commitments and restrictions on the distribution of profits                    
Performance Guarantees Issued           $ 3,600.0        
Praxair S.A. [member]                    
Contingencies, commitments and restrictions on the distribution of profits                    
Term of supply contract (Year)         14 years          
Purchase commitments           $ 32.7        
Techgen S.A. [member]                    
Contingencies, commitments and restrictions on the distribution of profits                    
Proportion of ownership interest in associate         22.00%          
Proportion of power generation capacity 22.00%         22.00%        
Usiminas [member]                    
Contingencies, commitments and restrictions on the distribution of profits                    
Proportion of ownership interest in associate         3.96%          
Ternium S.A. [member]                    
Contingencies, commitments and restrictions on the distribution of profits                    
Proportion of ownership interest in associate         11.46%          
Ternium S.A. [member] | Transportadora de Gas del Norte S.A. [member]                    
Contingencies, commitments and restrictions on the distribution of profits                    
Term of supply contract (Year)         25 years          
Brazil | Usiminas [member]                    
Contingencies, commitments and restrictions on the distribution of profits                    
Proportion of ownership interest in associate [1] 3.96% 3.07%                
Purchase commitments           $ 109.6        
Argentina                    
Contingencies, commitments and restrictions on the distribution of profits                    
Dumping rate imposed     78.30%              
Mexico                    
Contingencies, commitments and restrictions on the distribution of profits                    
Dumping rate imposed     44.93%              
Mexico | Techgen S.A. [member]                    
Contingencies, commitments and restrictions on the distribution of profits                    
Proportion of ownership interest in associate 22.00% 22.00%                
Luxembourg                    
Contingencies, commitments and restrictions on the distribution of profits                    
Percent of minimum transfer of net profit to legal reserve         5.00%          
Percent of minimum transfer of net profit until legal reserve equals issued share capital         10.00%          
Luxembourg | Ternium S.A. [member]                    
Contingencies, commitments and restrictions on the distribution of profits                    
Proportion of ownership interest in associate [2] 11.46% 11.46%                
Confab [member] | Chubb [member]                    
Contingencies, commitments and restrictions on the distribution of profits                    
Payments for settlement       $ 3.5            
Confab [member] | Veracel Celulose S.A. [member]                    
Contingencies, commitments and restrictions on the distribution of profits                    
Settlement, amount ordered to pay, insurance deductible               R$ 100.6 $ 20.8  
Settlement, amount ordered to pay, damages               R$ 86.4 $ 17.8  
Legal proceedings contingent liability [member]                    
Contingencies, commitments and restrictions on the distribution of profits                    
Payments for settlement         $ 9.5          
Tax contingent liability [member] | Petroleo Brasileiro S.A. [member]                    
Contingencies, commitments and restrictions on the distribution of profits                    
Estimated financial effect of contingent liabilities R$ 322.2         66.6        
Contingent liability for disgorgement and prejudgment interest [member]                    
Contingencies, commitments and restrictions on the distribution of profits                    
Settlement, amount ordered to pay             $ 53.1      
Contingent liability for civil penalty [member]                    
Contingencies, commitments and restrictions on the distribution of profits                    
Settlement, amount ordered to pay             $ 25.0      
TENARIS FINANCIAL SERVICES S.A. [member] | Onerous contracts contingent liability [member]                    
Contingencies, commitments and restrictions on the distribution of profits                    
Estimated financial effect of contingent liabilities           520.0        
CONFAB INDUSTRIAL S.A. and subsidiaries [member] | Companhia Siderúrgica Nacional [member]                    
Contingencies, commitments and restrictions on the distribution of profits                    
Percentage of interest payable per month         1.00%          
Percentage of compensation payable         10.00%          
Estimated financial effect of contingent liabilities 900.4         186.0        
Tag-along tender offer to non-controlling interests, percentage                   80.00%
Tag-along tender offer to non-controlling interests (in BRL per share) | R$ / shares                   R$ 28.8
Tag-along tender offer to non-controlling interests, shares (in shares) | shares                   182,609,851
Tag-along tender offer to non-controlling interests, contingent liability                   17.90%
CONFAB INDUSTRIAL S.A. and subsidiaries [member] | Tax contingent liability [member]                    
Contingencies, commitments and restrictions on the distribution of profits                    
Estimated financial effect of contingent liabilities R$ 60.7         $ 12.5        
Fine imposed, percentage of allegedly undue credits 75.00%         75.00%        
Ternium S.A. [member]                    
Contingencies, commitments and restrictions on the distribution of profits                    
Number of subsidiaries | Subsidiaries                   3
Ternium S.A. [member] | Techgen S.A. [member]                    
Contingencies, commitments and restrictions on the distribution of profits                    
Proportion of ownership interest in associate         48.00%          
IPSCO Tubulars, Inc. | Commitments and guarantees                    
Contingencies, commitments and restrictions on the distribution of profits                    
Term of supply contract (Year)         6 years          
Term of supply contract, available extension         12 months          
TENARIS BAY CITY, INC. [member] | Nucor Steel Memphis Inc. [member]                    
Contingencies, commitments and restrictions on the distribution of profits                    
Term of supply contract (Year)         3 years          
Purchase commitments           $ 73.7        
Purchase commitments percentage to be made 75.00%         75.00%        
JFE Steel Corporation [member]                    
Contingencies, commitments and restrictions on the distribution of profits                    
Purchase commitments           $ 30.9        
[1] At December 31, 2023 the voting rights were 6.76% and at December 31, 2022 were 5.19%.
[2] Including treasury shares.