Cybersecurity Risk Management and Strategy Disclosure	12 Months Ended
Dec. 31, 2025
Cybersecurity Risk Management, Strategy, and Governance [Line Items]
Cybersecurity Risk Management Processes for Assessing, Identifying, and Managing Threats [Text Block]	Cybersecurity Risk Management, Strategy and Governance Under the Company’s articles of association, as supplemented by the audit committee’s charter, the audit committee assists the board of directors in fulfilling its oversight responsibilities relating to the effectiveness of the Company’s systems of internal control, risk management and internal audit over financial reporting. In addition, the Company has established a management-level Critical Risk Committee (“CRC”) that assists the Company’s board of directors, the audit committee and the chief executive officer in connection with the monitoring, assessment and review of risks to which Tenaris is exposed and in the oversight of the risk management framework and processes, with a focus on critical risks (including accidents, cybersecurity and obsolescence, commercial execution, environmental, health and safety, and regulatory risks), the development of mitigating actions and the monitoring of action plans. The CRC, which comprises several senior executives, the risk assurance manager and the general counsel, periodically reports to the Company’s board of directors, the audit committee and the chief executive officer on its activities. For more information on the audit committee and CRC, see “Risk Factors - Risks Relating to Our Business and Industry - Cyberattacks could have a material adverse impact on our business and results of operations”. In particular, with respect to cybersecurity risks, Tenaris has adopted a “Cybersecurity Risk Management Methodology”, which sets forth a procedure to monitor, identify, communicate, assess the impact and likelihood and report actual or potential risks affecting Tenaris’s information systems, including platform, networking and systems vulnerabilities, processes, and sensitive information leaks or losses. The objective of our Cybersecurity Risk Management Methodology is to reduce, accept, transfer, or avoid the effects of such risks thereby reducing accidents, harm, losses, disruption to services, or other negative impacts. Our risk assessment methodology considers the potential impact of cybersecurity risks with respect to continuity of operations, information security (including confidentiality, integrity and availability), financial performance, compliance or reputational effects, and health, safety and environment damages. In addition, the adopted methodology considers the probability of occurrence of each event based on factors that vary according to specific risks. A Cybersecurity Risk Catalog is used to register detected risks, document risk assessments, and adopt appropriate action plans and reporting measures. If deemed appropriate (for example, when specific knowledge is required) specialized consultants may be engaged in connection with cybersecurity risk processes. Tenaris has adopted certain other cybersecurity procedures that complement the above-mentioned Cybersecurity Risk Management Methodology and seek to effectively manage cybersecurity incidents by analyzing potential impacts, containing the attack, eradicating the threat, and recovering from the incident; instructing users of Tenaris’s information systems on how to respond to cybersecurity incidents involving or affecting Tenaris IT resources or devices through which users may access any Tenaris’s IT systems; and providing instructions and best practices to Tenaris’s personnel with system administrator roles in connection with cybersecurity incident prevention, detection and response. Tenaris has also adopted a “Ransomware Crisis Management Procedure” setting forth the procedure to timely and adequately respond to a ransomware incident. In addition, because a cybersecurity incident may escalate into a major company crisis, “Tenaris’s Crisis Management Procedure” is triggered and applied when certain events signal potential material impacts. Tenaris’s policies, processes and procedures established to detect and manage cybersecurity risks are monitored and coordinated by a team of experienced and recognized professionals, including a chief information security officer, a cybersecurity risk management director and a cybersecurity and security architecture director, with an average of more than 25 years of experience in the cybersecurity and information technology fields. The chief information security officer periodically reports on their activities to the CRC. During 2025, no risks from cybersecurity threats, including as a result of any previous cybersecurity incidents, or third-party cybersecurity incidents, led to known breaches of our business-critical IT systems and, as such, have not materially affected, and are not reasonably likely to materially affect, Tenaris, including its business strategy, results of operations, or financial condition. Tenaris has integrated cyber-resilience standards into its cybersecurity strategy and operational capabilities. In 2025, the Company conducted its annual Red Team / Blue Team exercise, simulating real-world attack scenarios to evaluate preparedness and validate detection and response mechanisms. The exercise successfully met its objectives by testing protection, defense and incident response processes, and demonstrated strong cross-team collaboration. For more information on cybersecurity risks, see “Risk Factors - Risks Relating to Our Business and Industry - Cyberattacks could have a material adverse impact on our business and results of operations”.
Cybersecurity Risk Management Processes Integrated [Flag]	true
Cybersecurity Risk Management Processes Integrated [Text Block]	Our risk assessment methodology considers the potential impact of cybersecurity risks with respect to continuity of operations, information security (including confidentiality, integrity and availability), financial performance, compliance or reputational effects, and health, safety and environment damages.
Cybersecurity Risk Management Third Party Engaged [Flag]	true
Cybersecurity Risk Third Party Oversight and Identification Processes [Flag]	true
Cybersecurity Risk Materially Affected or Reasonably Likely to Materially Affect Registrant [Flag]	false
Cybersecurity Risk Board of Directors Oversight [Text Block]	Under the Company’s articles of association, as supplemented by the audit committee’s charter, the audit committee assists the board of directors in fulfilling its oversight responsibilities relating to the effectiveness of the Company’s systems of internal control, risk management and internal audit over financial reporting. In addition, the Company has established a management-level Critical Risk Committee (“CRC”) that assists the Company’s board of directors, the audit committee and the chief executive officer in connection with the monitoring, assessment and review of risks to which Tenaris is exposed and in the oversight of the risk management framework and processes, with a focus on critical risks (including accidents, cybersecurity and obsolescence, commercial execution, environmental, health and safety, and regulatory risks), the development of mitigating actions and the monitoring of action plans. The CRC, which comprises several senior executives, the risk assurance manager and the general counsel, periodically reports to the Company’s board of directors, the audit committee and the chief executive officer on its activities. For more information on the audit committee and CRC, see “Risk Factors - Risks Relating to Our Business and Industry - Cyberattacks could have a material adverse impact on our business and results of operations”.
Cybersecurity Risk Board Committee or Subcommittee Responsible for Oversight [Text Block]	In addition, the Company has established a management-level Critical Risk Committee (“CRC”) that assists the Company’s board of directors, the audit committee and the chief executive officer in connection with the monitoring, assessment and review of risks to which Tenaris is exposed and in the oversight of the risk management framework and processes, with a focus on critical risks (including accidents, cybersecurity and obsolescence, commercial execution, environmental, health and safety, and regulatory risks), the development of mitigating actions and the monitoring of action plans.
Cybersecurity Risk Process for Informing Board Committee or Subcommittee Responsible for Oversight [Text Block]	In addition, the Company has established a management-level Critical Risk Committee (“CRC”) that assists the Company’s board of directors, the audit committee and the chief executive officer in connection with the monitoring, assessment and review of risks to which Tenaris is exposed and in the oversight of the risk management framework and processes, with a focus on critical risks (including accidents, cybersecurity and obsolescence, commercial execution, environmental, health and safety, and regulatory risks), the development of mitigating actions and the monitoring of action plans. The CRC, which comprises several senior executives, the risk assurance manager and the general counsel, periodically reports to the Company’s board of directors, the audit committee and the chief executive officer on its activities. For more information on the audit committee and CRC, see “Risk Factors - Risks Relating to Our Business and Industry - Cyberattacks could have a material adverse impact on our business and results of operations”.
Cybersecurity Risk Role of Management [Text Block]	Tenaris’s policies, processes and procedures established to detect and manage cybersecurity risks are monitored and coordinated by a team of experienced and recognized professionals, including a chief information security officer, a cybersecurity risk management director and a cybersecurity and security architecture director, with an average of more than 25 years of experience in the cybersecurity and information technology fields. The chief information security officer periodically reports on their activities to the CRC. During 2025, no risks from cybersecurity threats, including as a result of any previous cybersecurity incidents, or third-party cybersecurity incidents, led to known breaches of our business-critical IT systems and, as such, have not materially affected, and are not reasonably likely to materially affect, Tenaris, including its business strategy, results of operations, or financial condition. Tenaris has integrated cyber-resilience standards into its cybersecurity strategy and operational capabilities. In 2025, the Company conducted its annual Red Team / Blue Team exercise, simulating real-world attack scenarios to evaluate preparedness and validate detection and response mechanisms. The exercise successfully met its objectives by testing protection, defense and incident response processes, and demonstrated strong cross-team collaboration.
Cybersecurity Risk Management Positions or Committees Responsible [Flag]	true
Cybersecurity Risk Management Positions or Committees Responsible [Text Block]	Tenaris’s policies, processes and procedures established to detect and manage cybersecurity risks are monitored and coordinated by a team of experienced and recognized professionals, including a chief information security officer, a cybersecurity risk management director and a cybersecurity and security architecture director, with an average of more than 25 years of experience in the cybersecurity and information technology fields. The chief information security officer periodically reports on their activities to the CRC. During 2025, no risks from cybersecurity threats, including as a result of any previous cybersecurity incidents, or third-party cybersecurity incidents, led to known breaches of our business-critical IT systems and, as such, have not materially affected, and are not reasonably likely to materially affect, Tenaris, including its business strategy, results of operations, or financial condition. Tenaris has integrated cyber-resilience standards into its cybersecurity strategy and operational capabilities. In 2025, the Company conducted its annual Red Team / Blue Team exercise, simulating real-world attack scenarios to evaluate preparedness and validate detection and response mechanisms. The exercise successfully met its objectives by testing protection, defense and incident response processes, and demonstrated strong cross-team collaboration.
Cybersecurity Risk Management Expertise of Management Responsible [Text Block]	a chief information security officer, a cybersecurity risk management director and a cybersecurity and security architecture director, with an average of more than 25 years of experience in the cybersecurity and information technology fields.
Cybersecurity Risk Process for Informing Management or Committees Responsible [Text Block]	Tenaris has integrated cyber-resilience standards into its cybersecurity strategy and operational capabilities. In 2025, the Company conducted its annual Red Team / Blue Team exercise, simulating real-world attack scenarios to evaluate preparedness and validate detection and response mechanisms. The exercise successfully met its objectives by testing protection, defense and incident response processes, and demonstrated strong cross-team collaboration.
Cybersecurity Risk Management Positions or Committees Responsible Report to Board [Flag]	true

Cybersecurity Risk Management and Strategy Disclosure

12 Months Ended

Dec. 31, 2025

Cybersecurity Risk Management, Strategy, and Governance [Line Items]

Cybersecurity Risk Management Processes for Assessing, Identifying, and Managing Threats [Text Block]

Risk Management, Strategy and Governance

Under the Company’s articles of association, as supplemented by the audit committee’s charter, the audit committee assists the board of directors in fulfilling its oversight responsibilities relating to the effectiveness of the Company’s systems of internal control, risk management and internal audit over financial reporting. In addition, the Company has established a management-level Critical Risk Committee (“CRC”) that assists the Company’s board of directors, the audit committee and the chief executive officer in connection with the monitoring, assessment and review of risks to which Tenaris is exposed and in the oversight of the risk management framework and processes, with a focus on critical risks (including accidents, cybersecurity and obsolescence, commercial execution, environmental, health and safety, and regulatory risks), the development of mitigating actions and the monitoring of action plans. The CRC, which comprises several senior executives, the risk assurance manager and the general counsel, periodically reports to the Company’s board of directors, the audit committee and the chief executive officer on its activities. For more information on the audit committee and CRC, see “Risk Factors - Risks Relating to Our Business and Industry - Cyberattacks could have a material adverse impact on our business and results of operations”.

In particular, with respect to cybersecurity risks, Tenaris has adopted a “Cybersecurity Risk Management Methodology”, which sets forth a procedure to monitor, identify, communicate, assess the impact and likelihood and report actual or potential risks affecting Tenaris’s information systems, including platform, networking and systems vulnerabilities, processes, and sensitive information leaks or losses. The objective of our Cybersecurity Risk Management Methodology is to reduce, accept, transfer, or avoid the effects of such risks thereby reducing accidents, harm, losses, disruption to services, or other negative impacts. Our risk assessment methodology considers the potential impact of cybersecurity risks with respect to continuity of operations, information security (including confidentiality, integrity and availability), financial performance, compliance or reputational effects, and health, safety and environment damages. In addition, the adopted methodology considers the probability of occurrence of each event based on factors that vary according to specific risks. A Cybersecurity Risk Catalog is used to register detected risks, document risk assessments, and adopt appropriate action plans and reporting measures. If deemed appropriate (for example, when specific knowledge is required) specialized consultants may be engaged in connection with cybersecurity risk processes.

Tenaris has adopted certain other cybersecurity procedures that complement the above-mentioned Cybersecurity Risk Management Methodology and seek to effectively manage cybersecurity incidents by analyzing potential impacts, containing the attack, eradicating the threat, and recovering from the incident; instructing users of Tenaris’s information systems on how to respond to cybersecurity incidents involving or affecting Tenaris IT resources or devices through which users may access any Tenaris’s IT systems; and providing instructions and best practices to Tenaris’s personnel with system administrator roles in connection with cybersecurity incident prevention, detection and response.

Tenaris has also adopted a “Ransomware Crisis Management Procedure” setting forth the procedure to timely and adequately respond to a ransomware incident. In addition, because a cybersecurity incident may escalate into a major company crisis, “Tenaris’s Crisis Management Procedure” is triggered and applied when certain events signal potential material impacts.

Tenaris’s policies, processes and procedures established to detect and manage cybersecurity risks are monitored and coordinated by a team of experienced and recognized professionals, including a chief information security officer, a cybersecurity risk management director and a cybersecurity and security architecture director, with an average of more than 25 years of experience in the cybersecurity and information technology fields. The chief information security officer periodically reports on their activities to the CRC.

During 2025, no risks from cybersecurity threats, including as a result of any previous cybersecurity incidents, or third-party cybersecurity incidents, led to known breaches of our business-critical IT systems and, as such, have not materially affected, and are not reasonably likely to materially affect, Tenaris, including its business strategy, results of operations, or financial condition.

Tenaris has integrated cyber-resilience standards into its cybersecurity strategy and operational capabilities. In 2025, the Company conducted its annual Red Team / Blue Team exercise, simulating real-world attack scenarios to evaluate preparedness and validate detection and response mechanisms. The exercise successfully met its objectives by testing protection, defense and incident response processes, and demonstrated strong cross-team collaboration.

For more information on cybersecurity risks, see “Risk Factors - Risks Relating to Our Business and Industry - Cyberattacks could have a material adverse impact on our business and results of operations”.

Cybersecurity Risk Management Processes Integrated [Flag]

true

Cybersecurity Risk Management Processes Integrated [Text Block]

Our risk assessment methodology considers the potential impact of cybersecurity risks with respect to continuity of operations, information security (including confidentiality, integrity and availability), financial performance, compliance or reputational effects, and health, safety and environment damages.

Cybersecurity Risk Management Third Party Engaged [Flag]

true

Cybersecurity Risk Third Party Oversight and Identification Processes [Flag]

true

Cybersecurity Risk Materially Affected or Reasonably Likely to Materially Affect Registrant [Flag]

false

Cybersecurity Risk Board of Directors Oversight [Text Block]

Cybersecurity Risk Board Committee or Subcommittee Responsible for Oversight [Text Block]

Cybersecurity Risk Process for Informing Board Committee or Subcommittee Responsible for Oversight [Text Block]

In addition, the Company has established a management-level Critical Risk Committee (“CRC”) that assists the Company’s board of directors, the audit committee and the chief executive officer in connection with the monitoring, assessment and review of risks to which Tenaris is exposed and in the oversight of the risk management framework and processes, with a focus on critical risks (including accidents, cybersecurity and obsolescence, commercial execution, environmental, health and safety, and regulatory risks), the development of mitigating actions and the monitoring of action plans. The CRC, which comprises several senior executives, the risk assurance manager and the general counsel, periodically reports to the Company’s board of directors, the audit committee and the chief executive officer on its activities. For more information on the audit committee and CRC, see “Risk Factors - Risks Relating to Our Business and Industry - Cyberattacks could have a material adverse impact on our business and results of operations”.

Cybersecurity Risk Role of Management [Text Block]

Cybersecurity Risk Management Positions or Committees Responsible [Flag]

true

Cybersecurity Risk Management Positions or Committees Responsible [Text Block]

Cybersecurity Risk Management Expertise of Management Responsible [Text Block]

a chief information security officer, a cybersecurity risk management director and a cybersecurity and security architecture director, with an average of more than 25 years of experience in the cybersecurity and information technology fields.

Cybersecurity Risk Process for Informing Management or Committees Responsible [Text Block]

Cybersecurity Risk Management Positions or Committees Responsible Report to Board [Flag]

true