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II. ACCOUNTING POLICIES (Details Textual)
R$ / shares in Units, $ / shares in Units, $ in Thousands, R$ in Millions
 12 Months Ended
Dec. 31, 2024
USD ($)
Subsidiaries
$ / shares
shares
Dec. 31, 2023
USD ($)
$ / shares
shares
Dec. 31, 2022
USD ($)
$ / shares
shares
Dec. 31, 2021
Dec. 31, 2017
Apr. 30, 2024
$ / shares
shares
Jul. 03, 2023
shares
Jul. 03, 2023
Jul. 03, 2023
BRL (R$)
Jul. 03, 2023
d
Jul. 03, 2023
USD ($)
Jul. 03, 2023
$ / shares
Jul. 03, 2023
Officers
Jul. 03, 2023
Directors
Mar. 30, 2023
R$ / shares
shares
Disclosure of associates [line items]                              
Minimum applicable tax rate 15.00%                            
Number of subsidiaries acquired | Subsidiaries 2                            
Forecast period of revenue projections 3 years                            
Number of major business segments 1                            
Total intangible assets and goodwill | $ $ 1,357,749 $ 1,377,110 $ 1,332,508                        
Research and development expense | $ $ 74,200 $ 60,000 $ 50,700                        
Number of shares authorised (in shares) | shares 2,500,000,000 2,500,000,000 2,500,000,000                        
Par value per share (in dollars per share) | $ / shares $ 1 $ 1 $ 1     $ 1                  
Total number of shares issued (in shares) | shares 1,162,757,528 1,180,536,830 1,180,536,830     1,180,536,830                  
Number of votes, per share 1 1 1                        
Employee benefits, unit vesting period (Year)         4 years                    
Employee benefits, company redemption period (Year) 7 years       10 years                    
Employee benefits, early redemption period (Year)         7 years                    
Carrying value of units granted | $ $ 175,000 $ 144,000                          
Dilutive effect of share options on number of ordinary shares (in shares) | shares 0                            
Maximum period of lease term of short term leases 12 months                            
Forecast period of cash flow projections 5 years                            
Nominal growth rate 2.00%                            
Maximum maturity period of fair value through other comprehensive income instruments for short-term nature 12 months                            
Other current Non-current benefits | $ $ 148,000 119,600                          
Pillar two legislation description The group applies the IAS 12 exception regarding the recognition and disclosure of deferred tax assets and liabilities related to Pillar Two income taxes.                            
Information system projects [member]                              
Disclosure of associates [line items]                              
Total intangible assets and goodwill | $ $ 97,106 72,165                          
Licenses, patents, trademarks, and proprietary technology [member]                              
Disclosure of associates [line items]                              
Total intangible assets and goodwill | $ 86,700 86,700 $ 86,700                        
Customer-related intangible assets [member]                              
Disclosure of associates [line items]                              
Total intangible assets and goodwill | $ $ 11,328 $ 47,906                          
Customer-related intangible assets [member] | Maverick Tube Corporation [member]                              
Disclosure of associates [line items]                              
Finite-lived intangible asset, useful life (Year) 14 years                            
Customer-related intangible assets [member] | Hydrill Company [member]                              
Disclosure of associates [line items]                              
Finite-lived intangible asset, useful life (Year) 10 years                            
Customer-related intangible assets [member] | SAUDI STEEL PIPE CO. and subsidiaries [Member]                              
Disclosure of associates [line items]                              
Selling, general and administrative expenses, additional amortization of intangible assets | $     $ 4,100                        
Finite-lived intangible asset, useful life (Year) 9 years   3 years 5 years                      
Finite-lived intangible asset, residual value | $ $ 11,300                            
Finite-lived intangible asset, residual useful life (Year) 9 months                            
Customer-related intangible assets [member] | Ipsco Tubulars Inc [Member]                              
Disclosure of associates [line items]                              
Finite-lived intangible asset, useful life (Year) 3 years                            
Customer-related intangible assets [member] | Mattrs Pipe Coating Business Unit [Member]                              
Disclosure of associates [line items]                              
Finite-lived intangible asset, useful life (Year) 4 months                            
Top of range [member]                              
Disclosure of associates [line items]                              
Percentage of voting rights held in unconsolidated entities 50.00%                            
Top of range [member] | Information system projects [member]                              
Disclosure of associates [line items]                              
Finite-lived intangible asset, useful life (Year) 3 years                            
Top of range [member] | Licenses, patents, trademarks, and proprietary technology [member]                              
Disclosure of associates [line items]                              
Finite-lived intangible asset, residual useful life (Year) 20 years                            
Bottom of range [member]                              
Disclosure of associates [line items]                              
Percentage of voting rights held in unconsolidated entities 20.00%                            
Bottom of range [member] | Licenses, patents, trademarks, and proprietary technology [member]                              
Disclosure of associates [line items]                              
Finite-lived intangible asset, residual useful life (Year) 3 years                            
Usiminas [member]                              
Disclosure of associates [line items]                              
Proportion of voting rights held in associate 6.76%                            
Usiminas [member] | The new SHA [member]                              
Disclosure of associates [line items]                              
Shares bound to SHA (in shares) | shares 483,600,000                            
Percent of company voting capital 68.60%                            
T/T Group [member] | The new SHA [member]                              
Disclosure of associates [line items]                              
Percent of company voting capital 61.30%                            
Ternium entitites [member] | The new SHA [member]                              
Disclosure of associates [line items]                              
Percent of company voting capital 51.50%                            
Confab [member] | The new SHA [member]                              
Disclosure of associates [line items]                              
Percent of company voting capital 9.80%                            
NSSMC [member] | The new SHA [member]                              
Disclosure of associates [line items]                              
Percent of company voting capital 31.70%                            
Previdencia Usiminas [member] | The new SHA [member]                              
Disclosure of associates [line items]                              
Percent of company voting capital 7.00%                            
Preference shares [member] | Usiminas [member]                              
Disclosure of associates [line items]                              
Number of shares subscribed to (in shares) | shares 1,300,000                            
Ordinary shares [member] | Usiminas [member]                              
Disclosure of associates [line items]                              
Number of shares subscribed to (in shares) | shares 47,500,000                            
Usiminas [member]                              
Disclosure of associates [line items]                              
Proportion of voting rights held in associate 6.76% 6.76%                          
Proportion of ownership interest in associate 3.96%                            
Ternium S.A. [member]                              
Disclosure of associates [line items]                              
Percentage of Outstanding Shares in Associate 11.70%                            
Major purchases of assets [member] | Usiminas [member] | The new SHA [member]                              
Disclosure of associates [line items]                              
Majority percentage of control group shares               55.00%              
Major purchases of assets [member] | Usiminas [member] | T/T Group [member]                              
Disclosure of associates [line items]                              
Percentage of voting capital increased in control group               9.80%              
Major purchases of assets [member] | Usiminas [member] | T/T Group [member] | The new SHA [member]                              
Disclosure of associates [line items]                              
Number of Board members can be appointed through the shareholders agreement | Officers                         4    
Major purchases of assets [member] | Usiminas [member] | Tenaris [member] | The new SHA [member]                              
Disclosure of associates [line items]                              
Number of Board members can be appointed through the shareholders agreement                         1 1  
Major purchases of assets [member] | Usiminas [member] | Ordinary shares [member] | T/T Group [member] | The new SHA [member]                              
Disclosure of associates [line items]                              
Number of shares outstanding in control group | shares                             68,700,000
Number of shares subscribed to (in shares) | shares             11,000,000                
Shares subscribed to, price per share (in BRL per share) | R$ / shares                             R$ 10
Thresold number of trading days immediately prior to date of exercising option | d                   40          
Shares subscribed to, value                 R$ 110   $ 22,700        
Major purchases of assets [member] | Usiminas [member] | Ordinary shares [member] | T/T Group [member] | The new SHA [member] | From two years anniversary right to buy [Member]                              
Disclosure of associates [line items]                              
Shares subscribed to, price per share (in BRL per share) | $ / shares                       $ 2.0584      
Major purchases of assets [member] | Usiminas [member] | Ordinary shares [member] | NSSMC [member] | The new SHA [member]                              
Disclosure of associates [line items]                              
Number of trading days to calculate moving average share price | d                   40          
Major purchases of assets [member] | Usiminas [member] | Ordinary shares [member] | NSSMC [member] | The new SHA [member] | From two years anniversary right to buy [Member]                              
Disclosure of associates [line items]                              
Number of shares right purchase under agreement | shares             153,100,000                
Major purchases of assets [member] | Usiminas [member] | Ordinary shares [member] | NSSMC [member] | The new SHA [member] | From two years anniversary right to sell [Member]                              
Disclosure of associates [line items]                              
Shares subscribed to, price per share (in BRL per share) | $ / shares                       $ 2.0584