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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
Apr. 30, 2024
shares
Oct. 27, 2022
Oct. 09, 2018
USD ($)
Dec. 31, 2024
BRL (R$)
Dec. 31, 2023
Dec. 31, 2024
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           $ 4,100.0        
Praxair S.A. [member]                    
Contingencies, commitments and restrictions on the distribution of profits                    
Term of supply contract (Year)       14 years            
Purchase commitments           28.1        
Vestas Group [member]                    
Contingencies, commitments and restrictions on the distribution of profits                    
Purchase commitments           $ 90.1        
Techgen S.A. [member]                    
Contingencies, commitments and restrictions on the distribution of profits                    
Proportion of ownership interest in associate       22.00% 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%            
Purchase commitments           $ 88.2        
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       3.96% 3.96%          
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%                
Luxembourg                    
Contingencies, commitments and restrictions on the distribution of profits                    
Cancellation of ordinary shares (in shares) | shares 17,779,302                  
Percent of minimum transfer of net profit to legal reserve       5.00%            
Percent of maximum issued share capital until which transfer of net profit to legal reserve       10.00%            
Luxembourg | Ternium S.A. [member]                    
Contingencies, commitments and restrictions on the distribution of profits                    
Proportion of ownership interest in associate       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$ 110.5 $ 17.8  
Settlement, amount ordered to pay, damages               R$ 94.8 $ 15.3  
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$ 193.2   31.2        
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      
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$ 62.1   $ 10.0        
Fine imposed, percentage of allegedly undue credits       75.00%   75.00%        
CONFAB INDUSTRIAL S.A. and Ternium Subsidiaries [member] | Companhia Siderúrgica Nacional [member]                    
Contingencies, commitments and restrictions on the distribution of profits                    
Professional fees expense | R$       R$ 5.0            
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
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           $ 57.7        
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           $ 25.1        
COARCO S.A. [member]                    
Contingencies, commitments and restrictions on the distribution of profits                    
Purchase commitments           39.9        
U.S. Steel Corporation [member]                    
Contingencies, commitments and restrictions on the distribution of profits                    
Term of supply contract (Year)       1 year            
Purchase commitments           31.2        
CONFAB INDUSTRIAL S.A. [member]                    
Contingencies, commitments and restrictions on the distribution of profits                    
Estimated financial effect of contingent liabilities       R$ 553.4   $ 89.4        
CONFAB INDUSTRIAL S.A. [member] | Companhia Siderúrgica Nacional [member]                    
Contingencies, commitments and restrictions on the distribution of profits                    
Tag-along tender offer to non-controlling interests, contingent liability                   17.90%