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Appendix I: Scope of Consolidation - Main Changes in the Scope of Consolidation for the Year (Details) | Dec. 31, 2024 | Dec. 31, 2023
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IPNET Serviços em Nuvem e Desenvolvimento de Sistemas Ltda Software and systems resale, professional services and project management |  |
Disclosure of subsidiaries [line items] |  |
% Acquisition | 88.24% |
IPNET USA, LLC Software and systems resale, professional services and project management |  |
Disclosure of subsidiaries [line items] |  |
% Acquisition | 88.24% |
Infrafibre Germany GmbH |  |
Disclosure of subsidiaries [line items] |  |
% Acquisition | 49.68% |
Compañía Mayorista de Fibra S.L. Provision of telecommunications services through FTTH network operation |  |
Disclosure of subsidiaries [line items] |  |
Ownership of incorporated company (in percentage) | 100.00% |
Gud Comercializadora de Energia S.A. |  |
Disclosure of subsidiaries [line items] |  |
Ownership of incorporated company (in percentage) | 38.24% |
TBSC Barcelona Producciones, SLU |  |
Disclosure of subsidiaries [line items] |  |
% sold | 100.00% |
O2 International Holdings Ltd. Holding company |  |
Disclosure of subsidiaries [line items] |  |
% sold | 100.00% |
Terra Networks Peru S.A. |  |
Disclosure of subsidiaries [line items] |  |
% sold | 100.00% |
Mobile Financial Services Holding SPRL Financial services |  |
Disclosure of subsidiaries [line items] |  |
% sold | 50.00% |
Cornerstone Telecommunications Infrastructure Limited |  |
Disclosure of subsidiaries [line items] |  |
% sold | 4.17% | 8.33%
Vale Saúde, Administradora de Cartões Ltda. Provision of health services |  |
Disclosure of subsidiaries [line items] |  |
% Acquisition |  | 75.29%
Telxius Telecom, S.A. |  |
Disclosure of subsidiaries [line items] |  |
% Acquisition |  | 40.00%
Cryptography & Security Systems S.L.U. Software programming activities |  |
Disclosure of subsidiaries [line items] |  |
% Acquisition |  | 100.00%
Telefónica Local Services GmbH Holding |  |
Disclosure of subsidiaries [line items] |  |
% Acquisition |  | 100.00%
BE-terna SRL |  |
Disclosure of subsidiaries [line items] |  |
Ownership of incorporated company (in percentage) |  | 100.00%
Telxius México, S.R.L. DE C.V |  |
Disclosure of subsidiaries [line items] |  |
Ownership of incorporated company (in percentage) |  | 70.00%
Utiq, S.A. |  |
Disclosure of subsidiaries [line items] |  |
Ownership of incorporated company (in percentage) |  | 25.00%
Pontel Participaciones, S.L. Holding company |  |
Disclosure of subsidiaries [line items] |  |
% sold |  | 13.35%
The Smart Steps Data Technology Company |  |
Disclosure of subsidiaries [line items] |  |
% sold |  | 33.75%
Kumo Analytics Limited |  |
Disclosure of subsidiaries [line items] |  |
% sold |  | 100.00%
iHackLabs Ltd. |  |
Disclosure of subsidiaries [line items] |  |
% sold |  | 100.00%
O2 (Netherlands) Holdings BV |  |
Disclosure of subsidiaries [line items] |  |
% sold |  | 100.00%
Telfin Ireland |  |
Disclosure of subsidiaries [line items] |  |
% sold |  | 100.00%
Unired Colombia S.A.S Service provider related to telecommunications |  |
Disclosure of subsidiaries [line items] |  |
Ownership of incorporated company (in percentage) | 33.75% |

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