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Note 36 - Climate change (Details Textual) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Feb. 28, 2021 | Dec. 31, 2025 USD ($) MW
Disclosure of climate change [line items] |  |
Investments in Windfarm | $ |  | $ 400
Capital expenditure budget allocated in past four years | $ |  | $ 700
Wind farm in Argentina [member] |  |
Disclosure of climate change [line items] |  |
Electric power generation capacity | MW |  | 103.2
Second wind farm in Argentina [member] |  |
Disclosure of climate change [line items] |  |
Electric power generation capacity | MW |  | 95
Medium term target [member] |  |
Disclosure of climate change [line items] |  |
Percentage of target for reducing carbon emissions intensity | 30.00% |
Period over climate-related target applies | 2030 |
Baseline from which progress for climate-related target is measured | 2018 |

X
- Definition The description of the baseline from which progress for climate-related target is measured. + References No definition available. + Details
Name: | ts_BaseLineFromWhichProgressForClimateRelatedTargetIsMeasured
Namespace Prefix: | ts_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of capital expenditure budget allocated in past four years. + References No definition available. + Details
Name: | ts_CapitalExpenditureBudgetAllocatedInPastFourYears
Namespace Prefix: | ts_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | ts_DisclosureOfClimateChangeLineItems
Namespace Prefix: | ts_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Measures unit of electic power generation capacity + References No definition available. + Details
Name: | ts_ElectricPowerGenerationCapacity
Namespace Prefix: | ts_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Definition The amount of investments made in a windfarm. + References No definition available. + Details
Name: | ts_InvestmentsInWindfarm
Namespace Prefix: | ts_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The percentage of the target for reducing the intensity of carbon emissions. + References No definition available. + Details
Name: | ts_PercentageOfTargetForReducingCarbonEmissionsIntensity
Namespace Prefix: | ts_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The description of the period over which the climate-related target applies. + References No definition available. + Details
Name: | ts_PeriodOverClimateRelatedTargetApplies
Namespace Prefix: | ts_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | ifrs-full_JointVenturesAxis=ts_WindFarmInArgentinaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_JointVenturesAxis=ts_SecondWindFarmInArgentinaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ts_TimeHorizonAxis=ts_MediumTermTargetMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |