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ACQUISITION OF BUSINESS – INCREASE OF THE PARTICIPATION IN USIMINAS CONTROL GROUP AND NEW GOVERNANCE STRUCTURE OF USIMINAS - Narrative (Details) $ in Thousands, shares in Millions |  |  |  |  | 6 Months Ended | 12 Months Ended |  |  |  |  |
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Jul. 03, 2023 USD ($) d officer shares | Jul. 02, 2023 | Jun. 30, 2023 group member vicePresident shares | Mar. 30, 2023 R$ / shares shares | Dec. 31, 2023 USD ($) | Jun. 30, 2023 group member vicePresident shares | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Jul. 03, 2023 R$ / shares | Jul. 19, 2016 shares | Apr. 20, 2016 shares | Oct. 30, 2014 shares | Jan. 16, 2012 shares
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of control group shares required for decision | 0.55 |  |  |  |  |  |  |  |  |  |  |  |  |
Quoted price (in BRL per share) | R$ / shares |  |  |  |  |  |  |  |  |  | R$ 7.36 |  |  |  |
Pro forma revenue as if combination occurred at beginning of the period |  |  |  |  |  |  | $ 5,517,000 |  |  |  |  |  |  |
Profit of combined entity as if combination occurred at beginning of period |  |  |  |  |  |  | 237,000 |  |  |  |  |  |  |
Financial liabilities |  |  |  |  | $ 5,043,160 |  | 5,043,160 | $ 2,438,751 |  |  |  |  |  |
Non-controlling interest |  |  |  |  | 4,393,264 |  | 4,393,264 | 1,922,434 |  |  |  |  |  |
Written put options |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial liabilities | $ 242,500 |  |  |  | 249,300 |  | 249,300 |  |  |  |  |  |  |
T/T Group |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of other board officers | officer | 4 |  |  |  |  |  |  |  |  |  |  |  |  |
Usiminas |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares acquired through business combination (in shares) | shares | 57.7 |  |  |  |  |  |  |  |  |  |  |  |  |
Cash transferred | $ 118,686 |  |  |  |  |  |  |  |  |  |  |  |  |
Remeasurement of previously held interest in Usiminas | 385,851 |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on the remeasurement of previously held interest in Usiminas | 441,410 |  |  |  |  |  |  |  |  |  |  |  |  |
Bargain purchase gain | 270,365 |  |  |  |  |  |  |  |  |  |  |  |  |
Effect Related To The Increase Of The Participation In Subsidiary | 171,045 |  |  |  |  |  | 171,045 | $ 0 | $ 0 |  |  |  |  |
Other comprehensive income that will be reclassified to profit or loss, before tax | 934,900 |  |  |  |  |  |  |  |  |  |  |  |  |
Non-controlling interest | 2,818,358 |  |  |  |  |  |  |  |  |  |  |  |  |
Non-controlling interest | $ 2,575,900 |  |  |  |  |  |  |  |  |  |  |  |  |
Usiminas | NSC Group |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of executive board members | member |  |  | 3 |  |  | 3 |  |  |  |  |  |  |  |
Nomination right for chief executive officer, alternation term |  |  | 4 years |  |  | 4 years |  |  |  |  |  |  |  |
Nomination right for board of directors, alternation term |  |  | 4 years |  |  | 4 years |  |  |  |  |  |  |  |
Usiminas | Ternium |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of executive board members | member |  |  | 3 |  |  | 3 |  |  |  |  |  |  |  |
Nomination right for chief executive officer, alternation term |  |  | 4 years |  |  | 4 years |  |  |  |  |  |  |  |
Nomination right for board of directors, alternation term |  |  | 4 years |  |  | 4 years |  |  |  |  |  |  |  |
Usiminas | T/T Group | Put And Call Option |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trading average price period | d | 40 |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative financial assets, share price (in BRL per share) | R$ / shares |  |  |  |  |  |  |  |  |  | R$ 10 |  |  |  |
Usiminas | Ordinary shares |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares to be acquired as per share purchase agreement (in shares) | shares |  |  |  | 68.7 |  |  |  |  |  |  |  |  |  |
Price per share as per share purchase agreement (in BRL per share) | R$ / shares |  |  |  | R$ 10 |  |  |  |  |  |  |  |  |  |
Ternium Investments | Usiminas |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Number of shares acquired through business combination (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 84.7
Ternium Argentina S.A. | Usiminas |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Number of shares acquired through business combination (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 30.0
Confab Industrial S.A. | Usiminas |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Number of shares acquired through business combination (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 25.0
Ternium Investments S.à.r.l. | Usiminas | Ordinary shares |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Number of shares acquired through business combination (in shares) | shares |  |  |  |  |  |  |  |  |  |  | 62.6 |  | 51.4 |
Ternium Investments S.à.r.l. | Usiminas | Preferred shares |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares acquired through business combination (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  | 7.0 |  |
Usiminas Control Group | Usiminas |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Number of shares held | shares |  |  | 483.6 |  |  | 483.6 |  |  |  |  |  |  |  |
Usiminas Control Group | Usiminas |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Proportion of voting rights held in associate |  |  | 68.60% |  |  |  |  |  |  |  |  |  |  |
The T/T Group, The NSC Group, And Previdência Usiminas |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of sub groups | group |  |  | 3 |  |  | 3 |  |  |  |  |  |  |  |
T/T Group | Usiminas Control Group |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of shares held |  |  | 0.471 |  |  |  |  |  |  |  |  |  |  |
T/T Group | Usiminas | Usiminas Control Group |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of shares held | 0.613 |  |  |  |  |  |  |  |  |  |  |  |  |
Ternium | Usiminas |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in associate (percent) |  | 20.40% |  |  |  |  |  |  |  |  |  |  |  |
Ternium | Usiminas Control Group |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Proportion of shares held |  |  | 0.395 |  |  |  |  |  |  |  |  |  |  |
Ternium | Usiminas |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in associate (percent) |  |  | 20.40% |  |  |  |  |  |  |  |  |  |  |
Effect Related To The Increase Of The Participation In Subsidiary |  |  |  |  |  |  | $ 171,045 |  |  |  |  |  |  |
Ternium | Usiminas | Usiminas Control Group |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of shares held | 0.515 |  |  |  |  |  |  |  |  |  |  |  |  |
Ternium | Usiminas | Ordinary shares |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares held | shares |  |  | 242.6 |  |  | 242.6 |  |  |  |  |  |  |  |
Proportion of shares held |  |  |  |  |  | 0.344 |  |  |  |  |  |  |  |
Ternium | Usiminas | Preferred shares |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares held | shares |  |  | 8.5 |  |  | 8.5 |  |  |  |  |  |  |  |
Proportion of shares held |  |  |  |  |  | 0.016 |  |  |  |  |  |  |  |
TenarisConfab | Usiminas Control Group |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Proportion of shares held |  |  | 0.076 |  |  |  |  |  |  |  |  |  |  |
NSC Group | Usiminas Control Group |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of shares held |  |  | 0.459 |  |  |  |  |  |  |  |  |  |  |
NSC Group | Usiminas | Usiminas Control Group |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of shares held | 0.317 |  |  |  |  |  |  |  |  |  |  |  |  |
NSC Group | Usiminas | T/T Group | Put And Call Option |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares held | shares | 153.1 |  |  |  |  |  |  |  |  |  |  |  |  |
Previdência Usiminas | Usiminas Control Group |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Proportion of shares held |  |  | 0.07 |  |  |  |  |  |  |  |  |  |  |
Previdência Usiminas | Usiminas | Usiminas Control Group |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Proportion of shares held | 0.071 |  |  |  |  |  |  |  |  |  |  |  |  |
Usiminas |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue of acquiree since acquisition date |  |  |  |  | 2,737,000 |  |  |  |  |  |  |  |  |
Loss on the remeasurement of previously held interest in Usiminas |  |  |  |  | $ 129,000 |  |  |  |  |  |  |  |  |
Usiminas | Usiminas |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of executive board members | member |  |  | 6 |  |  | 6 |  |  |  |  |  |  |  |
Number of vice-presidents | vicePresident |  |  | 5 |  |  | 5 |  |  |  |  |  |  |  |
Ternium Investments S.a.r.l. And Prosid | Usiminas | Ordinary shares |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares acquired through business combination (in shares) | shares |  |  |  |  |  |  |  |  |  |  | 13.8 |  |  |
Ternium Investments S.a.r.l. And Prosid | Usiminas | Preferred shares |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares acquired through business combination (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  | 1.5 |  |

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