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Note 32 - Principal Subsidiaries - Percentage of Ownership of Each Controlled Company (Details)

12 Months Ended

Dec. 31, 2019

Dec. 31, 2018

Dec. 31, 2017

HYDRIL COMPANY and subsidiaries [member]

Statement Line Items [Line Items]

Percentage of ownership

100.00%

CANADA | ALGOMA TUBES INC. [member]

Statement Line Items [Line Items]

Percentage of ownership

^[1]

100.00%

100.00%

100.00%

CANADA | PRUDENTIAL STEEL LTD. [member]

Statement Line Items [Line Items]

Percentage of ownership

^[1]

100.00%

100.00%

100.00%

CANADA | TENARIS GLOBAL SERVICES (CANADA) INC. [member]

Statement Line Items [Line Items]

Percentage of ownership

^[1]

100.00%

100.00%

100.00%

BRAZIL | CONFAB INDUSTRIAL S.A. and subsidiaries [member]

Statement Line Items [Line Items]

Percentage of ownership

^[1]

100.00%

100.00%

100.00%

ITALY | DALMINE S.p.A. [member]

Statement Line Items [Line Items]

Percentage of ownership

^[1]

100.00%

100.00%

100.00%

UNITED STATES | HYDRIL COMPANY and subsidiaries [member]

Statement Line Items [Line Items]

Percentage of ownership

^[1],[2]

100.00%

100.00%

100.00%

UNITED STATES | MAVERICK TUBE CORPORATION and subsidiaries [member]

Statement Line Items [Line Items]

Percentage of ownership

^[1]

100.00%

100.00%

100.00%

UNITED STATES | TENARIS BAY CITY, INC. [member]

Statement Line Items [Line Items]

Percentage of ownership

^[1]

100.00%

100.00%

100.00%

UNITED STATES | TENARIS GLOBAL SERVICES (U.S.A.) CORPORATION [member]

Statement Line Items [Line Items]

Percentage of ownership

^[1]

100.00%

100.00%

100.00%

KAZAKHSTAN | Kazakhstan Pipe Threaders Limited [member]

Statement Line Items [Line Items]

Percentage of ownership

^[1]

100.00%

100.00%

100.00%

JAPAN | NKKTUBES [member]

Statement Line Items [Line Items]

Percentage of ownership

^[1]

51.00%

51.00%

51.00%

INDONESIA | PT SEAMLESS PIPE INDONESIA JAYA [member]

Statement Line Items [Line Items]

Percentage of ownership

^[1]

89.00%

89.00%

89.00%

ROMANIA | S.C. SILCOTUB S.A. [member]

Statement Line Items [Line Items]

Percentage of ownership

^[1]

100.00%

100.00%

100.00%

SAUDI ARABIA | Saudi Steel Pipe Company [member]

Statement Line Items [Line Items]

Percentage of ownership

^[1]

48.00%

ARGENTINA | SIAT SOCIEDAD ANONIMA [member]

Statement Line Items [Line Items]

Percentage of ownership

^[1]

100.00%

100.00%

100.00%

ARGENTINA | SIDERCA S.A.I.C. and subsidiaries [member]

Statement Line Items [Line Items]

Percentage of ownership

100.00%

100.00%

100.00%

PORTUGAL | TALTA—TRADING E MARKETING SOCIEDADE UNIPESSOAL LDA. [member]

Statement Line Items [Line Items]

Percentage of ownership

^[1]

100.00%

100.00%

100.00%

NETHERLANDS | TENARIS CONNECTIONS BV [member]

Statement Line Items [Line Items]

Percentage of ownership

^[1]

100.00%

100.00%

100.00%

NETHERLANDS | Tenaris Investments (NL) B.V. [member]

Statement Line Items [Line Items]

Percentage of ownership

^[1]

100.00%

URUGUAY | TENARIS FINANCIAL SERVICES S.A. [member]

Statement Line Items [Line Items]

Percentage of ownership

^[1]

100.00%

100.00%

100.00%

URUGUAY | TENARIS GLOBAL SERVICES S.A. and subsidiaries [member]

Statement Line Items [Line Items]

Percentage of ownership

^[1],[3]

100.00%

100.00%

100.00%

UNITED KINGDOM | TENARIS GLOBAL SERVICES (UK) LTD [member]

Statement Line Items [Line Items]

Percentage of ownership

^[1]

100.00%

100.00%

100.00%

LUXEMBOURG | TENARIS INVESTMENTS S.àr.l. [member]

Statement Line Items [Line Items]

Percentage of ownership

^[1]

100.00%

100.00%

100.00%

SWITZERLAND | TENARIS INVESTMENTS SWITZERLAND AG and subsidiaries [member]

Statement Line Items [Line Items]

Percentage of ownership

^[1]

100.00%

100.00%

100.00%

Colombia [member] | TENARIS TUBOCARIBE LTDA. [member]

Statement Line Items [Line Items]

Percentage of ownership

^[1]

100.00%

100.00%

100.00%

MEXICO | TUBOS DE ACERO DE MEXICO S.A. [member]

Statement Line Items [Line Items]

Percentage of ownership

^[1]

100.00%

100.00%

100.00%

[1]	All percentages rounded.
[2]	Tenaris Investments S.a.r.l. holds 100% of Hydril's subsidiaries shares except for Technical Drilling & Production Services Nigeria. Ltd where it holds 80%.
[3]	Tenaris holds 97,5% of Tenaris Supply Chain S.A. and 40% of Tubular Technical Services Ltd. and Pipe Coaters Nigeria Ltd., 49% of Amaja Tubular Services Limited, 49% Tubular Services Angola Lda.

X

- 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
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-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
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-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2019-en-r&anchor=para_19B_c&doctype=Standard
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- References

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- Details

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