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DERIVATIVE FINANCIAL INSTRUMENTS (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2013
Disclosure of detailed information about financial instruments [line items] |  |
Other comprehensive loss that will be reclassified to profit or loss, before tax | $ 60 |
Interest rate swap contracts | Tenigal S. de R.L. de C.V. |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 6,300 | $ 100,000
Derivative, average fixed interest rate |  | 1.92%
Reserve of cash flow hedges, net of tax | (40) |
Non-deliverable forward contract | Ternium Argentina S.A. |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 100,000 |
Non-deliverable forward contract | Ternium Colombia S.A.S |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 87,800 |
Forward contract | Ternium Mexico S.A. de C.V. |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 44,000 |
Forward contract | Ternium Investments S.a.r.l. |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | $ 12,800 |

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