The amount of instruments issued by the entity that represent indebtedness.

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The fair value of investments in associates if there are quoted market prices for the investment. [Refer: Associates [member]; Investments in associates reported in separate financial statements]

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 12
-IssueDate 2023-01-01
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The gain (loss) recognised as result of remeasuring to fair value the equity interest in the acquiree held by the acquirer before the business combination. [Refer: Business combinations [member]]

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The amount of any gain recognised in a business combination in which the net of the identifiable assets acquired and the liabilities assumed exceeds the aggregate of the consideration transferred, non-controlling interest in the acquiree and fair value of the acquirer's previously held equity interest in the acquiree. [Refer: Business combinations [member]]

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The amount of investments in subsidiaries, joint ventures and associates in an entity's separate financial statements. [Refer: Associates [member]; Joint ventures [member]; Subsidiaries [member]; Investments in subsidiaries reported in separate financial statements]

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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The amount of non-derivative financial assets with fixed or determinable payments that are not quoted in an active market, other than: (a) those that the entity intends to sell immediately or in the near term, which shall be classified as held for trading, and those that the entity, upon initial recognition, designates as at fair value through profit or loss; (b) those that the entity, upon initial recognition, designates as available for sale; or (c) those for which the holder may not recover substantially all of its initial investment, other than because of credit deterioration, which shall be classified as available for sale. An interest acquired in a pool of assets that are not loans or receivables (for example, an interest in a mutual fund or a similar fund) is not a loan or receivable. [Refer: Derivative financial assets]

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Expired 2023-01-01
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The percentage of voting equity interests acquired in a business combination. [Refer: Business combinations [member]]

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-Name IFRS
-Number 3
-IssueDate 2023-01-01
-Paragraph B64
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The proportion of ownership interest in an associate attributable to the entity. [Refer: Associates [member]]

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Number 27
-IssueDate 2023-01-01
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The proportion of ownership interest in a subsidiary attributable to the entity. [Refer: Subsidiaries [member]]

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 27
-IssueDate 2023-01-01
-Paragraph 17
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The proportion of the voting rights in an associate held by the entity. [Refer: Associates [member]]

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The amount of a closing price per American Depositary Security (ADS) as quoted on the New York Stock Exchange. Each ADS equals two shares.

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The percent amount of covered debt service coverage ratio.

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Represents the amount of divdends declared by nonconsolidated companies.

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The amount of exposure to the purchase of clean energy certificates.

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The amount of impairment loss recognised in profit or loss in non-consolidated companies.

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Represents the proportion of a corporate guarantee that covers obligations made under a syndicated loan agreement.

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Note 14 - Investments in non-consolidated companies (Details Textual) $ / shares in Units, $ in Thousands		12 Months Ended
	May 17, 2023 USD ($)	Dec. 31, 2023 USD ($) $ / shares	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2023 R$ / shares	Feb. 13, 2019 USD ($)
Disclosure of unconsolidated structured entities [line items]
Total investments in subsidiaries, joint ventures and associates		$ 1,608,804	$ 1,540,646	$ 1,383,774
Bargain purchase gain		3,162
Impairment loss in non-consolidated companies			34,041
Dividends and distributions declared		$ 69,216	64,189
Proportion of ownership interest in subsidiary		50.00%
PAO Severstal [member]
Disclosure of unconsolidated structured entities [line items]
Impairment loss in non-consolidated companies		$ 14,900	14,900
Techgen S.A. [member]
Disclosure of unconsolidated structured entities [line items]
Total investments in subsidiaries, joint ventures and associates		$ 53,600
Ternium S.A. [member]
Disclosure of unconsolidated structured entities [line items]
Closing price, per ads (in dollars per share) \| $ / shares		$ 42.47
Ternium and Usiminas [member]
Disclosure of unconsolidated structured entities [line items]
Dividends and distributions declared		$ 68,800	$ 66,200
Usiminas [member]
Disclosure of unconsolidated structured entities [line items]
Proportion of voting rights held in associate		6.76%	5.19%
Fair value of investments in associates for which there are quoted market prices		$ 92,700
Total investments in subsidiaries, joint ventures and associates		$ 123,700
Proportion of ownership interest in associate		3.96%
Loss Recognised Due to Particiaption Increase in Nonconsolidated Companies	$ 25,500	$ 25,500
Impairment loss in non-consolidated companies		$ 19,100	$ 19,100
Usiminas [member] \| Ordinary shares [member]
Disclosure of unconsolidated structured entities [line items]
Closing price, per share (in BRL per share) \| (per share)		$ 1.9			R$ 9.2
Usiminas [member] \| Preference shares [member]
Disclosure of unconsolidated structured entities [line items]
Closing price, per share (in BRL per share) \| (per share)		$ 1.92			R$ 9.29
Ternium S.A. [member]
Disclosure of unconsolidated structured entities [line items]
Fair value of investments in associates for which there are quoted market prices		$ 975,600
Total investments in subsidiaries, joint ventures and associates		$ 1,430,600
Proportion of ownership interest in associate		11.46%
Techgen S.A. [member]
Disclosure of unconsolidated structured entities [line items]
Proportion of ownership interest in associate		22.00%
Exposure to transportation capacity agreements		$ 39,400
Exposure to the purchase of clean energy certificates		16,900
Techgen S.A. [member] \| Tenaris [member]
Disclosure of unconsolidated structured entities [line items]
Loans and receivables		$ 61,900
Proportion of corporate guarantee covering obligations		22.00%
Techgen S.A. [member] \| Several banks, to refinance obligations [member]
Disclosure of unconsolidated structured entities [line items]
Debt instruments issued						$ 640,000
Techgen S.A. [member] \| Tecpetrol International S.A. [member]
Disclosure of unconsolidated structured entities [line items]
Proportion of ownership interest in associate		30.00%
Techgen S.A. [member] \| Tenaris SA [member]
Disclosure of unconsolidated structured entities [line items]
Debt service coverage ratio, covered, percent		22.00%
Letters of credit, covered		$ 10,900
Techgen S.A. [member] \| Ternium S.A. [member]
Disclosure of unconsolidated structured entities [line items]
Proportion of ownership interest in associate		48.00%
Techgen S.A. [member] \| Ternium S.A. [member] \| Tecpetrol International S.A. [member] \| Tenaris [member]
Disclosure of unconsolidated structured entities [line items]
Loans and receivables		$ 281,300
Global Pipe Company [Member]
Disclosure of unconsolidated structured entities [line items]
Gain (loss) recognised as result of remeasuring to fair value equity interest in acquiree held by acquirer before business combination	4,500
Bargain purchase gain	$ 11,500
Global Pipe Company [Member] \| SAUDI STEEL PIPE CO. and subsidiaries [Member]
Disclosure of unconsolidated structured entities [line items]
Percentage of voting equity interests acquired	22.30%
Proportion of ownership interest in subsidiary	57.30%