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Note 26 - Contingencies, Commitments and Restrictions On the Distribution of Profits (Details Textual)
$ / shares in Units, $ in Thousands, R$ in Millions
12 Months Ended
Oct. 27, 2022
Oct. 09, 2018
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
Dec. 31, 2022
BRL (R$)
Dec. 31, 2022
USD ($)
Jun. 24, 2022
USD ($)
Oct. 10, 2018
BRL (R$)
Oct. 10, 2018
USD ($)
Jan. 31, 2012
$ / shares
shares
Contingencies, commitments and restrictions on the distribution of profits                    
Performance Guarantees Issued           $ 3,600,000        
Praxair S.A. [member]                    
Contingencies, commitments and restrictions on the distribution of profits                    
Term of supply contract (Year)     14 years              
Purchase commitments           $ 36,400        
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%        
Techgen 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              
Usiminas [member]                    
Contingencies, commitments and restrictions on the distribution of profits                    
Proportion of ownership interest in associate     3.07%              
Ternium S.A. [member]                    
Contingencies, commitments and restrictions on the distribution of profits                    
Proportion of ownership interest in associate     11.46%              
Brazil | Usiminas [member]                    
Contingencies, commitments and restrictions on the distribution of profits                    
Proportion of ownership interest in associate [1]     3.07% 3.07%            
Argentina                    
Contingencies, commitments and restrictions on the distribution of profits                    
Dumping rate imposed 78.30%                  
Argentina | Usiminas [member] | Presidente Nestor Kirchner Gas Pipeline [member]                    
Contingencies, commitments and restrictions on the distribution of profits                    
Purchase commitments           $ 183,600        
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   $ 3,500                
Confab [member] | Veracel Celulose S.A. [member]                    
Contingencies, commitments and restrictions on the distribution of profits                    
Settlement, amount ordered to pay, insurance deductible               R$ 91.9 $ 17,400  
Settlement, amount ordered to pay, damages               R$ 78.8 $ 15,100  
Legal proceedings contingent liability [member]                    
Contingencies, commitments and restrictions on the distribution of profits                    
Payments for settlement     $ 9,500              
Commitments and guarantees | Voestalpine Grobblech GmbH [member]                    
Contingencies, commitments and restrictions on the distribution of profits                    
Purchase commitments           30,200        
Commitments and guarantees | Vestas Group [member]                    
Contingencies, commitments and restrictions on the distribution of profits                    
Purchase commitments           47,700        
Commitments and guarantees | Ternium USA, Inc. [member]                    
Contingencies, commitments and restrictions on the distribution of profits                    
Term of supply contract (Year)     1 year              
Purchase commitments           6,300        
Term of supply contract, available extension     1 year              
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$ 284.2 54,500        
Contingent liability for disgorgement and prejudgment interest [member]                    
Contingencies, commitments and restrictions on the distribution of profits                    
Settlement, amount ordered to pay             $ 53,100      
Contingent liability for civil penalty [member]                    
Contingencies, commitments and restrictions on the distribution of profits                    
Settlement, amount ordered to pay             $ 25,000      
CONFAB INDUSTRIAL S.A. and subsidiaries [member] | Companhia Siderúrgica Nacional [member]                    
Contingencies, commitments and restrictions on the distribution of profits                    
Tag-along tender offer to non-controlling interests, percentage                   80.00%
Tag-along tender offer to non-controlling interests (in BRL per share) | $ / shares                   $ 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$ 59.2 $ 11,300        
Fine imposed, percentage of allegedly undue credits         75.00% 75.00%        
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           $ 85,800        
Purchase commitments percentage to be made         75.00% 75.00%        
[1] At December 31,2022 and 2021the voting rights were 5.19%.
[2] Including treasury shares.