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Note 8 - Income Tax (Details Textual) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of geographical areas [line items] |  |  |
After tax effect of expense not deductible in determining profit (loss) | $ 61 | $ 66 | $ 65
Charge related to withholding taxes for intra group international operations | $ 10 | $ 34 | $ 26

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. + Details
Name: | ifrs-full_DisclosureOfGeographicalAreasLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount represents the difference between the after tax expense (income) and the product of the accounting profit multiplied by the applicable tax rate(s) that relates to expenses not deductible in determining profit (loss). + References No definition available. + Details
Name: | ts_AfterTaxEffectOfExpenseNotDeductibleInDeterminingProfitLoss
Namespace Prefix: | ts_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the amount of charge related to withholding taxes for intra group international operations during the period. + References No definition available. + Details
Name: | ts_ChargeRelatedToWithholdingTaxesForIntraGroupInternationalOperations
Namespace Prefix: | ts_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration