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Note 31 - Principal Subsidiaries (Details Textual)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
HYDRIL COMPANY and subsidiaries [member]
Disclosure of subsidiaries [line items]
Proportion of ownership interest in subsidiary		100.00%
Technical Drilling & Production Services Nigeria. Ltd [member]
Disclosure of subsidiaries [line items]
Proportion of ownership interest in subsidiary		80.00%	80.00%
Tenaris Supply Chain S.A. [member]
Disclosure of subsidiaries [line items]
Proportion of ownership interest in subsidiary	97.50%
Tubular Technical Services and Pipe Coaters [member]
Disclosure of subsidiaries [line items]
Proportion of ownership interest in subsidiary	40.00%
Amaja Tubular Services Limited [member]
Disclosure of subsidiaries [line items]
Proportion of ownership interest in subsidiary	49.00%
Tubular Services Angola Lda. [member]
Disclosure of subsidiaries [line items]
Proportion of ownership interest in subsidiary	49.00%
Tenaris Baogang Baotou Steel Pipes Ltd [member]
Disclosure of subsidiaries [line items]
Proportion of ownership interest in subsidiary	60.00%

X

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

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- Definition

The proportion of ownership interest in a subsidiary attributable to the entity. [Refer: Subsidiaries [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 27
-IssueDate 2019-01-01
-Paragraph 17
-Subparagraph b
-Clause iii
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=27&code=ifrs-tx-2019-en-r&anchor=para_17_b_iii&doctype=Standard
-URIDate 2019-03-27

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 27
-IssueDate 2019-01-01
-Paragraph 16
-Subparagraph b
-Clause iii
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=27&code=ifrs-tx-2019-en-r&anchor=para_16_b_iii&doctype=Standard
-URIDate 2019-03-27

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 12
-IssueDate 2019-01-01
-Paragraph 19B
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2019-en-r&anchor=para_19B_c&doctype=Standard
-URIDate 2019-03-27

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