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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, 2023
USD ($)
Subsidiaries
$ / shares
shares
Dec. 31, 2023
USD ($)
Subsidiaries
$ / shares
shares
Dec. 31, 2022
USD ($)
$ / shares
shares
Dec. 31, 2021
USD ($)
$ / shares
shares
Dec. 31, 2017
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
Directors
Jul. 03, 2023
Officers
Mar. 30, 2023
R$ / shares
shares
Dec. 31, 2020
$ / shares
Disclosure of associates [line items]                              
Minimum applicable tax rate   15.00%                          
Number of subsidiaries acquired | Subsidiaries 2 2                          
Forecast period of revenue projections   3 years                          
Goodwill or intangible assets recognized in relation to investments in non consolidated companies under the equity method $ 0 $ 0                          
Number of major business segments 1 1                          
Total intangible assets and goodwill $ 1,377,110 $ 1,377,110 $ 1,332,508                        
Research and development expense   $ 60,000 $ 50,700 $ 45,300                      
Number of shares authorised (in shares) | shares 2,500,000,000 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                     $ 1
Total number of shares issued (in shares) | shares 1,180,536,830 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     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 $ 144,000 $ 144,000 $ 123,900                        
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% 2.00%                          
Maximum maturity period of fair value through other comprehensive income instruments for short-term nature   12 months                          
Other current Non-current benefits $ 119,600 $ 119,600 94,400                        
Information system projects [member]                              
Disclosure of associates [line items]                              
Total intangible assets and goodwill 72,165 72,165 53,355                        
Licenses, patents, trademarks, and proprietary technology [member]                              
Disclosure of associates [line items]                              
Total intangible assets and goodwill 86,700 86,700 86,700 $ 86,700                      
Customer-related intangible assets [member]                              
Disclosure of associates [line items]                              
Total intangible assets and goodwill $ 47,906 $ 47,906 41,527                        
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 useful life (Year) 1 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                          
Finite-lived intangible asset, residual value $ 26,400 $ 26,400                          
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                          
Finite-lived intangible asset, residual value $ 21,500 $ 21,500                          
Finite-lived intangible asset, residual useful life (Year) 3 months                            
Top of range [member]                              
Disclosure of associates [line items]                              
Discount rate used in current estimate of value in use 21.40% 21.40% 20.20% 18.80%                      
Percentage of voting rights held in unconsolidated entities 50.00% 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, useful life (Year)   20 years                          
Bottom of range [member]                              
Disclosure of associates [line items]                              
Discount rate used in current estimate of value in use 12.50% 12.50% 13.40% 10.90%                      
Percentage of voting rights held in unconsolidated entities 20.00% 20.00%                          
Bottom of range [member] | Licenses, patents, trademarks, and proprietary technology [member]                              
Disclosure of associates [line items]                              
Finite-lived intangible asset, useful life (Year)   3 years                          
Usiminas [member] | The new SHA [member]                              
Disclosure of associates [line items]                              
Shares bound to SHA (in shares) | shares 483,600,000 483,600,000                          
Percent of company voting capital 68.60% 68.60%                          
T/T Group [member] | The new SHA [member]                              
Disclosure of associates [line items]                              
Percent of company voting capital 61.30% 61.30%                          
Ternium entitites [member] | The new SHA [member]                              
Disclosure of associates [line items]                              
Percent of company voting capital 51.50% 51.50%                          
Confab [member] | The new SHA [member]                              
Disclosure of associates [line items]                              
Percent of company voting capital 9.80% 9.80%                          
NSSMC [member] | The new SHA [member]                              
Disclosure of associates [line items]                              
Percent of company voting capital 31.70% 31.70%                          
Previdencia Usiminas [member] | The new SHA [member]                              
Disclosure of associates [line items]                              
Percent of company voting capital 7.00% 7.00%                          
Usiminas [member]                              
Disclosure of associates [line items]                              
Proportion of voting rights held in associate   6.76% 5.19%                        
Usiminas [member] | Preference shares [member]                              
Disclosure of associates [line items]                              
Number of shares subscribed to (in shares) | shares 1,300,000 1,300,000                          
Usiminas [member] | Ordinary shares [member]                              
Disclosure of associates [line items]                              
Number of shares subscribed to (in shares) | shares 47,500,000 47,500,000                          
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                     $ 10        
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                     $ 10