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v3.20.1

Accounting Policies - Changes in Key Assumptions That Would Cause the Recoverable Amount to Equal the Carrying Value (Details) | Dec. 31, 2019
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Discount rate, measurement input [member] |
Statement Line Items [Line Items] |
Increase (decrease) in key assumption | 0.95%
Growth rate, measurement input [member] |
Statement Line Items [Line Items] |
Increase (decrease) in key assumption | (1.60%)
Projected change rate in future cash flows, measurement input [member] |
Statement Line Items [Line Items] |
Increase (decrease) in key assumption | (15.30%)

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- Definition The amount by which value that has been assigned to a key assumption must change in order for a unit's recoverable amount to be equal to its carrying amount, expressed as a percentage. + References No definition available. + Details
Name: | ts_AmountByWhichValueAssignedToKeyAssumptionMustChangeInOrderForUnitsRecoverableAmountToBeEqualToCarryingAmountPercentage
Namespace Prefix: | ts_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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

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- Details
Name: | ifrs-full_UnobservableInputsAxis=ifrs-full_DiscountRateMeasurementInputMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_UnobservableInputsAxis=ts_GrowthRateMeasurementInputMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_UnobservableInputsAxis=ts_ProjectedChangeRateInFutureCashFlowsMeasurementInputMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |