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BORROWINGS (Significant Borrowings) (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | May 31, 2022 | Aug. 31, 2019 | Jul. 31, 2019
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Ternium Brazil Syndicated Loan Due August 2024 |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Original principal amount | $ 500 |  |  | $ 500 |
Usiminas Bonds Due July 2026 |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Original principal amount | 750 |  |  |  | $ 750
Usiminas Debentures -8th Emission Due May 2029 |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Original principal amount | 134 |  | $ 145 |  |
Usiminas Debentures -9th Emission Due December 2032 |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Original principal amount | $ 287 | $ 310 |  |  |

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