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BORROWINGS (Significant borrowings) (Details) - USD ($) | Dec. 31, 2018 | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Disclosure of detailed information about borrowings [line items] |  |  |
Borrowings | $ 2,036,957,000 |  | $ 3,221,907,000
Ternium Mexico Syndicated Loan Due November 2018 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Original principal amount | 800,000,000 |  |
Borrowings | 0 |  |
Tenigal Syndicated Loan Due July 2022 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Original principal amount | 200,000,000 |  |
Borrowings | 100,000,000 |  |
Ternium Investments S.à r.l Syndicated Loan Due September 2022 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Original principal amount | 1,500,000,000 |  |
Borrowings | 1,125,000,000 |  |
Ternium Mexico Syndicated Loan Due June 2023 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Original principal amount | 1,000,000,000 | $ 1,000,000,000 |
Borrowings | 400,000,000 |  |
Undrawn borrowing facilities | $ 600,000,000 |  |

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- Definition The amount of undrawn borrowing facilities that may be available for future operating activities and to settle capital commitments. [Refer: Capital commitments] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 7 -IssueDate 2017-01-01 -Paragraph 50 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2017-03-01&anchor=para_50_a&doctype=Standard -URIDate 2017-03-09 + Details
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