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FOREIGN EXCHANGE RESTRICTIONS IN ARGENTINA - (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure of subsidiaries [line items] |  |  |  |
Net sales | $ 16,414,466 | $ 16,090,744 | $ 8,735,435 |
Assets | 17,491,548 | 17,097,907 |  |
Total Liabilities | 3,723,155 | 4,862,869 |  |
Usiminas' shareholders' equity | 13,768,393 | 12,235,038 | $ 8,443,153 | $ 7,714,873
Financial assets | 5,007,447 | 4,607,991 |  |
Financial liabilities | 2,438,751 | 2,875,591 |  |
Ternium Argentina S.A. |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Net sales | 3,830,000 | 3,425,000 |  |
Profit (loss) from continuing operations | 756,000 | 930,000 |  |
Assets | 5,258,000 | 4,798,000 |  |
Total Liabilities | 511,000 | 541,000 |  |
Usiminas' shareholders' equity | 4,747,000 | $ 4,257,000 |  |
Cash and cash equivalents and other investments | 1,363,000 |  |  |
Financial assets | 261,000 |  |  |
Financial liabilities | 254,000 |  |  |
Ternium Argentina S.A. | Argentine Pesos-Denominated Instruments |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Cash and cash equivalents and other investments | 145,000 |  |  |
Ternium Argentina S.A. | Deposit certificates |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Cash and cash equivalents and other investments | 66,000 |  |  |
Ternium Argentina S.A. | Sovereign Bonds |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Cash and cash equivalents and other investments | $ 1,152,000 |  |  |

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