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Appendix I: Scope of Consolidation - Main Consolidated Companies of the Telefonica Group (Details) € in Millions, ₨ in Millions, лв in Millions, дин in Millions, £ in Millions, kr in Millions, kr in Millions, kr in Millions, SFr in Millions, S/ in Millions, R$ in Millions, Bs.F in Millions, $ in Millions, $ in Millions, $ in Millions, $ in Millions, $ in Millions, $ in Millions | 12 Months Ended |  |  |  |
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Dec. 31, 2024 EUR (€) | Dec. 31, 2024 BRL (R$) | Dec. 31, 2024 USD ($) | Dec. 31, 2024 VEF (Bs.F) | Dec. 31, 2024 COP ($) | Dec. 31, 2024 MXN ($) | Dec. 31, 2024 ARS ($) | Dec. 31, 2024 CLP ($) | Dec. 31, 2024 PEN (S/) | Dec. 31, 2024 UYU ($) | Dec. 31, 2024 GBP (£) | Dec. 31, 2024 BGN (лв) | Dec. 31, 2024 INR (₨) | Dec. 31, 2024 SEK (kr) | Dec. 31, 2024 CHF (SFr) | Dec. 31, 2024 DKK (kr) | Dec. 31, 2024 NOK (kr) | Dec. 31, 2024 RSD (дин) | Dec. 31, 2023 EUR (€) | Dec. 31, 2022 EUR (€) | Dec. 31, 2021 EUR (€)
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | € 22,749 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 27,096 | € 31,708 | € 28,684
Investments accounted for by the equity method | 8,375 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 8,590 |  |
Telefónica de España, S.A.U. Telecommunications service provider |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | € 1,024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Móviles España, S.A.U. Wireless communications services provider |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | € 209 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Teleinformática y Comunicaciones, S.A.U. (Telyco) Promotion, marketing and distribution of telephone and telematic equipment and services |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | € 8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Soluciones de Informática y Com. de España S.A.U. Telecommunications systems, networks and infrastructure engineering |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | € 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Soluciones de Outsourcing, S.A.U. Promotion and networks management |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | € 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Servicios Integrales de Distribución S.A.U. Logistic service provider |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | € 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica España Filiales, S.A.U. Organization and operation of multimedia service-related business |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | € 226 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Servicios Audiovisuales, S.A.U. Provision of all type of audiovisual telecommunications services |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | € 6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Broadcast Services, S.L.U. DSNG-based transmission and operation services |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | € 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Audiovisual Digital, S.L.U. Provision of all type of audiovisual telecommunications services |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | € 46 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Global Technology, S.A.U. Global management and operation of IT systems |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | € 16 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Educación Digital, S.L.U. Vertical e-learning portal |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | € 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bluevia Fibra S.L.U. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | € 68 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 55.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bluevia Fibra S.L.U. | Telefónica España Filiales, S.A |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 30.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bluevia Fibra S.L.U. | Telefónica Infra, S.L.U. Holding company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 25.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Solar360 Soluciones de Instalacion y Mantenimiento S.L. Marketing and management in the installation, sale and maintenance of photovoltaic equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | € 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 51.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Ingeniería de Seguridad, S.A.U. Security services and systems |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | € 5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Compañía Mayorista de Fibra S.L. Provision of telecommunications services through FTTH network operation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | € 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Deutschland Holding, A.G. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | € 2,975 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 96.85% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Deutschland Holding, A.G. | Telefónica Germany Holdings Limited |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 69.22% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Deutschland Holding, A.G. | Telefónica, S.A. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 27.63% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Germany GmbH & Co. OHG Wireless communications services operator |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | € 51 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 96.85% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Germany GmbH & Co. OHG Wireless communications services operator | Telefónica Deutschland Holding A.G. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 96.84% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Germany GmbH & Co. OHG Wireless communications services operator | T Germany Management GmbH |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 0.01% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
E-Plus Service GmbH Wireless communications services operator |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | € 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 96.85% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Germany Business Sales GmbH Technological and consulting services in Big Data provider |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | € 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 96.85% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
O2 Telefónica Deutschland Finanzierungs GmbH Integrated cash management, consulting and financial support for Group companies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | € 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 96.85% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Germany 1. Beteiligungsgesellschaft mbH Holding company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | € 5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 96.85% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ortel Mobile GmbH Provision of international mobile communications services |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | € 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 96.85% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Germany Retail GmbH Office machinery, computers, peripheral equipment and software |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | € 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 96.85% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
AY YILDIZ Communications GmbH Telecommunications service provider |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | € 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 96.85% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
TCHIBO Mobilfunk GmbH & Co. Marketing and sales of mobile services |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | € 7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 48.42% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Brazil |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | R$ |  | R$ 62,071 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 76.49% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Brazil | Telefónica, S.A. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 38.90% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Brazil | Telefónica Latinoamérica Holding, S.L. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 37.34% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Brazil | Telefónica Chile, S.A. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 0.06% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Terra Networks Brasil, Ltda. ISP and portal |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | R$ |  | 317 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 76.49% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefônica Infraestructura e Segurança Ltda. Security services and systems |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | R$ |  | 321 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 76.49% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vivo ventures fundo de investimento em participacoes multiestrategia. Investment funds |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | R$ |  | 145 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 76.96% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vivo ventures fundo de investimento em participacoes multiestrategia. Investment funds | Telefônica Brasil, S.A. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 74.96% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vivo ventures fundo de investimento em participacoes multiestrategia. Investment funds | Telefonica Open Innovation S.L.U. Talent identification and development in ICT. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 2.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vale Saúde, Administradora de Cartões Ltda. Provision of health services |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | R$ |  | 7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 76.49% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefônica Cloud e Tecnologia do Brasil S.A. Cybersecurity, electronic information security and IT consultancy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | R$ |  | 104 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 88.24% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefônica Cloud e Tecnologia do Brasil S.A. Cybersecurity, electronic information security and IT consultancy | Telefônica Brasil, S.A. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 44.13% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefônica Cloud e Tecnologia do Brasil S.A. Cybersecurity, electronic information security and IT consultancy | Telefónica Cybersecurity & Cloud Tech S.L.U. Cybersecurity, electronic information security and IT consultancy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 44.11% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
IPNET Serviços em Nuvem e Desenvolvimento de Sistemas Ltda Software and systems resale, professional services and project management |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | R$ |  | 31 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 88.24% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
IPNET USA, LLC Software and systems resale, professional services and project management |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | $ |  |  | $ 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 88.24% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Hispanoamérica, S.A.U. Holding company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | € 108 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
TLH Holdco, S.L.U. Holding company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | € 87 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Venezolana, C.A. Wireless communications operator |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | Bs.F |  |  |  | Bs.F 1,905 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Venezolana, C.A. Wireless communications operator | Telefónica Hispanoamérica, S.A. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 97.13% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Venezolana, C.A. Wireless communications operator | Comtel Comunicaciones Telefónicas, S.A. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 2.87% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Colombia |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | $ |  |  |  |  | $ 3,410 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 67.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operaciones Tecnológicas y Comerciales S.A.S Communications services operator |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | $ |  |  |  |  | 3,330 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 67.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unired Colombia S.A.S Service provider related to telecommunications |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 33.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments accounted for by the equity method | $ |  |  |  |  | 12,826 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pegaso Pcs S.A. de C.V. Communications services operator |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | $ |  |  |  |  |  | $ 3,241 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pegaso Pcs S.A. de C.V. Communications services operator | Telefónica Hispanoamérica, S.A. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 99.98% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pegaso Pcs S.A. de C.V. Communications services operator | Celular de Telefonía S.A. de CV. Consulting services |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 0.02% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Celular de Telefonía S.A. de CV. Consulting services |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | $ |  |  |  |  |  | 2,650 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Celular de Telefonía S.A. de CV. Consulting services | Telefónica Hispanoamérica, S.A. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 32.35% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Celular de Telefonía S.A. de CV. Consulting services | Pegaso Pcs S.A. de C.V. Communications services operator |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 67.65% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Terra Networks México, S.A. de C.V. ISP, portal and real-time financial information services |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | $ |  |  |  |  |  | 305 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fisatel México, S.A. de C.V. SOFOM E.N.R. Integrated cash mangement, consulting and financial support for Group companies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | $ |  |  |  |  |  | 1,805 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fisatel México, S.A. de C.V. SOFOM E.N.R. Integrated cash mangement, consulting and financial support for Group companies | Telefónica Hispanoamérica, S.A. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 99.99% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fisatel México, S.A. de C.V. SOFOM E.N.R. Integrated cash mangement, consulting and financial support for Group companies | Pegaso Pcs S.A. de C.V. Communications services operator |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 0.01% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Otecel, S.A. Wireless communications services provider |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | $ |  |  | 183 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Móviles Argentina, S.A. Telecommunications service provider |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | $ |  |  |  |  |  |  | $ 188,019 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Móviles Chile, S.A. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | $ |  |  |  |  |  |  |  | $ 1,631,069 |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Móviles Chile, S.A. | Telefónica Hispanoamérica, S.A. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 0.86% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Móviles Chile, S.A. | Inversiones Telefónica Internacional Holding, SpA. Holding Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 99.14% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Chile, S.A. Local and international long distance telephony services provider |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | $ |  |  |  |  |  |  |  | 874,773 |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 99.39% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Chile Holdings, S.L.U. Holding Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | € 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Empresas Chile S.A. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | $ |  |  |  |  |  |  |  | 103,756 |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 99.39% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Chile Servicios Corporativos Limitada HUB service provider |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | $ |  |  |  |  |  |  |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 99.69% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Chile Servicios Corporativos Limitada HUB service provider | Telefónica Chile, S.A. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 49.54% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Chile Servicios Corporativos Limitada HUB service provider | Telefónica Empresas Chile S.A. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 1.30% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Chile Servicios Corporativos Limitada HUB service provider | Telefónica Móviles Chile, S.A. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 48.85% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Inversiones Telefónica Internacional Holding, SpA. Holding Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | $ |  |  |  |  |  |  |  | 511 |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica del Perú, S.A.A. Local, domestic and international long distance telephone service provider |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | S/ |  |  |  |  |  |  |  |  | S/ 831 |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 99.32% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Media Networks Latin America, S.A.C Telecommunications research activities and proyects |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | S/ |  |  |  |  |  |  |  |  | 158 |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pangeaco, S.A.C Fibre rollout and capacity service provision |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | S/ |  |  |  |  |  |  |  |  | 4 |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pangeaco, S.A.C Fibre rollout and capacity service provision | Telefónica Latinoamérica Holding, S.L. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 0.01% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pangeaco, S.A.C Fibre rollout and capacity service provision | Telefónica Hispanoamérica, S.A.U. Holding company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 99.99% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Móviles del Uruguay, S.A. Wireless communications and services operator |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | $ |  |  |  |  |  |  |  |  |  | $ 1,107 |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Infra, S.L.U. Holding company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | € 12 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Infra Germany GmbH Broadband telecommunications operator |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | € 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica O2 Holdings Ltd. Holding company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | £ |  |  |  |  |  |  |  |  |  |  | £ 9 |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica O2 Holdings Ltd. Holding company | Telefónica, S.A. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 99.99% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica O2 Holdings Ltd. Holding company | Telefónica Capital S.A. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 0.01% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
MmO2 Ltd. Holding company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | £ |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Germany Holdings Ltd. Holding company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | € 3,463 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
O2 (Europe) Ltd. Holding company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | € 6,895 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica International Holding, B.V Holding company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | € 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Latinoamérica Holding, S.L.U. Holding company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | € 291 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Global Solutions, S.L.U. International service provider |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | € 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefonica Global Solutions USA, Inc. Provision of telecommunications services |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | $ |  |  | 202 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Global Solutions Germany GmbH. International service provider |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | € 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Global Solutions México, S.A. de C.V. Carrying out research activities and projects in the field of telecommunications |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | $ |  |  |  |  |  | 67 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Innovación Digital, S.L.U. Carrying out research activities and services in the field of telecommunications. Holding company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | € 28 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Digital Ltd. Developer Telco Services |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | £ |  |  |  |  |  |  |  |  |  |  | 45 |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefonica Open Innovation S.L.U. Talent identification and development in ICT. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | € 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Wayra Chile Tecnología e Innovación SpA Technological innovation based business project development |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | $ |  |  |  |  |  |  |  | 29,899 |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Wayra Brasil Desenvolvedora e Apoiadora de Projetos Ltda Technological innovation based business project development |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | R$ |  | 52 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Wayra Brasil Desenvolvedora e Apoiadora de Projetos Ltda Technological innovation based business project development | Telefonica Open Innovation S.L.U. Talent identification and development in ICT. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 99.99% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Wayra Brasil Desenvolvedora e Apoiadora de Projetos Ltda Technological innovation based business project development | Telefónica Innovación Digital, S.L.U. Carrying out research activities and services in the field of telecommunications. Holding company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 0.01% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
WY Telecom, S.A. de C.V. Talent identification and development in ICT |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | $ |  |  |  |  |  | 134 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
WY Telecom, S.A. de C.V. Talent identification and development in ICT | Telefonica Open Innovation S.L.U. Talent identification and development in ICT. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 99.99% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
WY Telecom, S.A. de C.V. Talent identification and development in ICT | Telefónica Innovación Digital, S.L.U. Carrying out research activities and services in the field of telecommunications. Holding company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 0.01% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Wayra Argentina, S.A. Talent identification and development in ICT |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | $ |  |  |  |  |  |  | 7,607 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Wayra Argentina, S.A. Talent identification and development in ICT | Telefonica Open Innovation S.L.U. Talent identification and development in ICT. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 95.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Wayra Argentina, S.A. Talent identification and development in ICT | Telefónica Innovación Digital, S.L.U. Carrying out research activities and services in the field of telecommunications. Holding company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 5.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Wayra Colombia, S.A.S. Technological innovation based business project development |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | $ |  |  |  |  | 2,304 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proyecto Wayra, C.A. Commercial, industrial and mercantile activities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | Bs.F |  |  |  | Bs.F 13 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Wayra Perú Aceleradora de Proyectos, S.A.C. Technological innovation based business project development |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | S/ |  |  |  |  |  |  |  |  | 28 |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Wayra UK Ltd. Technological innovation based business project development |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | £ |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Terra Networks Argentina, S.A. ISP and portal |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | $ |  |  |  |  |  |  | $ 287 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Terra Networks Argentina, S.A. ISP and portal | Telefónica Latinoamérica Holding, S.L. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 99.99% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Terra Networks Argentina, S.A. ISP and portal | Telefónica International Holding, B.V. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 0.01% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telfisa Global, B.V. Integrated cash management, consulting and financial support for Group companies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | € 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Global Activities Holding, B.V. Holding Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | € 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Global Services, GmbH Purchasing services |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | € 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Global Roaming, GmbH Optimization of network traffic |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | € 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Group 3G UMTS Holding GmbH Holding Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | € 250 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
QUAM GmbH. IT facilities management activities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | € 250 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Compras Electrónicas, S.L.U. Development and provision of information Society services |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | € 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefonica Iot & Big Data Tech S.A.U. Provision of telemarketing services |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | € 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Geprom Software Engineering S.L.U. Technical engineering services and other consultancy activities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | € 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Geprom Software Engineering S.A. de C.V. Technical engineering services and other consultancy activities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | $ |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
TIS Hispanoamérica, S.L.U. Security services and systems |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | € 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Capital, S.A.U. Finance company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | € 7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lotca Servicios Integrales, S.L.U. Aircraft ownership and operation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | € 18 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fonditel Pensiones, Entidad Gestora de Fondos de Pensiones, S.A Administration of pension funds |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | € 16 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 70.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fonditel Gestión, Soc. Gestora de Instituciones de Inversión Colectiva, S.A.U. Administration and representation of collective investment schemes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | € 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Luxembourg Holding, S.à.r.L. Holding company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | € 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nova Casiopea RE S.A. Reinsurance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | € 15 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Seguros y Reaseguros Compañía Aseguradora, S.A.U. Conducting direct insurance business |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | € 24 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Finanzas, S.A.U. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | € 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Correduría de Seguros y Reaseguros Compañía de Mediación, S.A. Distribution, promotion or preparation of insurance contracts |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | € 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Correduría de Seguros y Reaseguros Compañía de Mediación, S.A. Distribution, promotion or preparation of insurance contracts | Telefónica, S.A. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 16.67% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Correduría de Seguros y Reaseguros Compañía de Mediación, S.A. Distribution, promotion or preparation of insurance contracts | Telefónica Finanzas, S.A.U. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 83.33% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Europe, B.V. Fund raising in capital markets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | € 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Participaciones, S.A.U. Financial debt instrument issuer |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | € 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Emisiones, S.A.U. Financial debt instrument issuer |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | € 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aliança Atlântica Holding B.V. Holding company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | € 40 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 88.24% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aliança Atlântica Holding B.V. Holding company | Telefónica, S.A. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aliança Atlântica Holding B.V. Holding company | Telefônica Brasil, S.A. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 38.24% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Serviços Empresariais do BRASIL, Ltda. Management and administrative services rendered |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | R$ |  | 63 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Gestión Integral de Edificios y Servicios S.L.U. Management and administrative services rendered |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | € 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
O2 Worldwide Limited Wireless telecommunications activities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | £ |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Servicios Globales, S.L.U. Holding company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | € 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Holding Atticus, B.V. Holding company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | € 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Soluciones de Criptografía, S.A.U. Engineering, research and development |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | € 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cryptography & Security Systems S.L.U. Software programming activities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | € 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Centroamérica Inversiones ,S.L. Communications services provider |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | € 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 60.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Tech S.L.U. Holding company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | € 67 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Cybersecurity & Cloud Tech S.L.U. Cybersecurity, electronic information security and IT consultancy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | € 34 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Cybersecurity & Cloud Tech Chile SpA. Cybersecurity, electronic information security and IT consulting |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | $ |  |  |  |  |  |  |  | 20,540 |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Tech Inc. Cybersecurity, electronic information security and IT consulting |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | $ |  |  | 7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Audertis Audit Services S.L.U. Provision of audit services in the areas of security, privacy and data protection |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | € 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Govertis Advisory Services S.L.U. Cybersecurity, electronic information security and IT consulting |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | € 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefonica Tech Colombia, SAS Cybersecurity, electronic information security and IT consulting |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | $ |  |  |  |  | 406 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefonica Cybersecurity Tech Mexico, S.A de C.V. Cybersecurity, electronic information security and IT consulting |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | $ |  |  |  |  |  | 80 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefonica Cybersecurity Tech Mexico, S.A de C.V. Cybersecurity, electronic information security and IT consulting | Telefónica Cybersecurity & Cloud Tech Chile SpA. Cybersecurity, electronic information security and IT consulting |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 60.47% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefonica Cybersecurity Tech Mexico, S.A de C.V. Cybersecurity, electronic information security and IT consulting | Telefonica Iot & Big Data Tech S.A.U. Provision of telemarketing services |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 39.53% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefônica Cibersegurança e Tecnología do Brasil Ltda Cybersecurity, electronic information security and IT consulting |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | R$ |  | 26 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Tech Perú S.A.C. Cybersecurity, electronic information security and IT consulting |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | S/ |  |  |  |  |  |  |  |  | 30 |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefonica Cybersecurity & Cloud Tech Deutschland GmbH |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | € 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acens Technologies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | € 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Altostratus Solutions, S.L. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | € 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefonica Tech UK & Ireland, Limited |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | £ |  |  |  |  |  |  |  |  |  |  | 14 |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefonica Tech UK Holdings Limited |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | £ |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefonica Tech UK TOG Limited |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | £ |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefonica Tech UK Managed Services Limited |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | £ |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefonica Tech UK Limited |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | £ |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefonica Tech Northern Ireland Holdings Limited |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | £ |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefonica Tech Communication & Collaboration Limited |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | £ |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefonica Tech Northern Ireland Limited |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | £ |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefonica Tech Ireland Limited |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | € 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefonica Tech Ocean Limited |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | £ |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Perpetual Topco Limited |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | £ |  |  |  |  |  |  |  |  |  |  | 4 |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Perpetual Midco Limited |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | £ |  |  |  |  |  |  |  |  |  |  | 4 |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Perpetual Bidco Limited |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | £ |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Incremental Group Holdings Limited |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | £ |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redspire Limited |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | £ |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Tech UK Business Applications Limited |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | £ |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adatis Group Limited |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | £ |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Tech UK Data & AI Limited |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | £ |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Tech Bulgaria Limited |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | лв |  |  |  |  |  |  |  |  |  |  |  | лв 0 |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Tech India Private Limited |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | ₨ |  |  |  |  |  |  |  |  |  |  |  |  | ₨ 0 |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Tech India Private Limited | Telefonica Tech UK & Ireland, Limited |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 99.99% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Tech India Private Limited | Telefonica Tech UK Limited |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 0.01% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Tech UK Data & AI MS Limited |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | £ |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
BE-terna Enhancement GmbH |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | € 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
BE-terna Germany GmbH |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | € 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
BE-terna AB (Sweden) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | kr |  |  |  |  |  |  |  |  |  |  |  |  |  | kr 0 |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
BE-Terna Automation AG |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | SFr |  |  |  |  |  |  |  |  |  |  |  |  |  |  | SFr 0 |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
BE-terna ApS (Denmark) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | kr |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | kr 0 |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
BE-terna B.V. (Netherlands) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | € 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
BE-terna GmbH (Leipzig) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | € 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
BE-terna Austria GmbH |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | € 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
BE-terna GmbH (Innsbruck) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | € 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pipol A/S |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | kr |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | kr 1 |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
BE-terna A/S (Norway) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | kr |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | kr 0 |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
BE-terna Business Solutions GmbH |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | € 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
BE-terna Industry Solutions GmbH |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | € 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
BE-terna AG (Switzerland) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | SFr |  |  |  |  |  |  |  |  |  |  |  |  |  |  | SFr 0 |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
BE-terna SRL |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | € 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
BE-terna Adriatic |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | € 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
BE-terna Belgrade (Serbia) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | дин |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | дин 14 |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
BE-terna Ljubijana (Slovenia) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | € 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
BE-terna Zagreb (Croatia) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | € 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telxius Telecom, S.A. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | € 260 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 70.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telxius Cable América, S.A. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | $ |  |  | 291 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 70.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telxius Cable España, S.L.U. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | € 5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 70.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telxius Cable República Dominicana, S.A.S. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | $ |  |  | 6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 70.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telxius Cable República Dominicana, S.A.S. | Telxius Cable América, S.A. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 69.30% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telxius Cable República Dominicana, S.A.S. | Telxius Cable España, S.L.U. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 0.70% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telxius Cable Argentina, S.A. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | $ |  |  | 78 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 70.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telxius Cable Argentina, S.A. | Telxius Cable América, S.A. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 66.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telxius Cable Argentina, S.A. | Telxius Cable España, S.L.U. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 3.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telxius Cable Panamá, S.A. Installation and operation of telecommunications networks for wholesalers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | $ |  |  | 10 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 70.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telxius Cable Puerto Rico, Inc. High capacity optical fibre network communications services |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | $ |  |  | 14 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 70.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telxius Cable USA, Inc. High bandwidth communications services |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | $ |  |  | 58 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 70.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telxius Cable Ecuador, S.A. Sale of usage of data transmission capacity via an underwater optical fibre network |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | $ |  |  | 5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 70.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telxius Cable Chile S.A. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | $ |  |  | 26 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 70.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telxius Cable Guatemala, S.A. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | $ |  |  | 20 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 70.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telxius Cable Perú, S.A.C. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | $ |  |  | 20 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 70.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telxius Cable Colombia, S.A. Supply of data transmission capacity via underwater cable system |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | $ |  |  | 4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 70.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telxius Cable Colombia, S.A. Supply of data transmission capacity via underwater cable system | Telxius Cable América, S.A. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 66.49% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telxius Cable Colombia, S.A. Supply of data transmission capacity via underwater cable system | Telxius Cable Chile S.A. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 1.17% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telxius Cable Colombia, S.A. Supply of data transmission capacity via underwater cable system | Telxius Cable Perú, S.A.C. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 1.17% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telxius Cable Colombia, S.A. Supply of data transmission capacity via underwater cable system | Telxius Cable Guatemala, S.A. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 1.16% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telxius Cable Colombia, S.A. Supply of data transmission capacity via underwater cable system | Telxius Cable Argentina, S.A. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 0.01% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telxius Cable Brasil Participaçoes, Ltda. Holding company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | $ |  |  | 62 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 70.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telxius Cable Brasil, Ltda. Operation and deployment of telecommunications infrastructure |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | $ |  |  | 74 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 70.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telxius Cable Bolivia, S.A. Establishment and operation of any kind of communications infrastructure and/or network |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | $ |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 70.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telxius Cable Bolivia, S.A. Establishment and operation of any kind of communications infrastructure and/or network | Telxius Cable América, S.A. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 68.90% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telxius Cable Bolivia, S.A. Establishment and operation of any kind of communications infrastructure and/or network | Telxius Cable España, S.L.U. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 0.55% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telxius Cable Bolivia, S.A. Establishment and operation of any kind of communications infrastructure and/or network | Telxius Cable Argentina, S.A. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 0.55% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telxius México, S.R.L. DE C.V |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | $ |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 70.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telxius México, S.R.L. DE C.V | Telxius Cable América, S.A. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 69.98% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telxius México, S.R.L. DE C.V | Telxius Cable España, S.L.U. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 0.02% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Local Services GmbH Holding |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity | € 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
VMO2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments accounted for by the equity method | £ |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |
FiBrasil Infraestructura e Fibra Ótica, S.A. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 44.12% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments accounted for by the equity method | R$ |  | 189 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
FiBrasil Infraestructura e Fibra Ótica, S.A. | Telefónica Infra, S.L.U. Holding company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 25.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
FiBrasil Infraestructura e Fibra Ótica, S.A. | Telefonica Brasil, S.A. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 19.12% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
VivaE Educação Digital S.A |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 38.24% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments accounted for by the equity method | R$ |  | 33 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gud Comercializadora de Energia S.A. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 38.24% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments accounted for by the equity method | R$ |  | 21 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
HoldCo infraCo SpA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 39.76% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments accounted for by the equity method | $ |  |  |  |  |  |  |  | 135,534 |  |  |  |  |  |  |  |  |  |  |  |  |
HoldCo Infraco SpA. (Onnet Fibra Chile) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 39.76% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments accounted for by the equity method | $ |  |  |  |  |  |  |  | $ 246,002 |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Factoring España, S.A. Factoring |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments accounted for by the equity method | € 5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Factoring Do Brasil, Ltd. Factoring services provider |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments accounted for by the equity method | R$ |  | R$ 5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Factoring Do Brasil, Ltd. Factoring services provider | Telefónica, S.A. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 40.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Factoring Do Brasil, Ltd. Factoring services provider | Telefónica Factoring España, S.A. Factoring |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 10.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Factoring Mexico, S.A. de C.V. SOFOM ENR Factoring services provider |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments accounted for by the equity method | $ |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Factoring Mexico, S.A. de C.V. SOFOM ENR Factoring services provider | Telefónica, S.A. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 40.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Factoring Mexico, S.A. de C.V. SOFOM ENR Factoring services provider | Telefónica Factoring España, S.A. Factoring |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 9.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Factoring Perú, S.A.C. Factoring services provider |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments accounted for by the equity method | S/ |  |  |  |  |  |  |  |  | 6 |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Factoring Perú, S.A.C. Factoring services provider | Telefónica, S.A. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 40.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Factoring Perú, S.A.C. Factoring services provider | Telefónica Factoring España, S.A. Factoring |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 9.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Factoring Colombia, S.A. Factoring services provider |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments accounted for by the equity method | $ |  |  |  |  | 4,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Factoring Colombia, S.A. Factoring services provider | Telefónica, S.A. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 40.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Factoring Colombia, S.A. Factoring services provider | Telefónica Factoring España, S.A. Factoring |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 9.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Factoring Chile, SpA. Factoring services provider |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments accounted for by the equity method | $ |  |  | $ 547 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Consumer Finance, Establecimiento Financiero de Crédito, S.A. Specialised credit institution |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments accounted for by the equity method | € 5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Movistar Consumer Finance Colombia SAS. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments accounted for by the equity method | $ |  |  |  |  | 6,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Alamo HoldCo S.L. (Onnet Fibra Colombia) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 27.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments accounted for by the equity method | € 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Onnet Fibra Colombia S.A.S. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 27.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments accounted for by the equity method | $ |  |  |  |  | $ 56,307 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Internet para todos S.A.C |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 54.30% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments accounted for by the equity method | S/ |  |  |  |  |  |  |  |  | S/ 364 |  |  |  |  |  |  |  |  |  |  |  |
Movistar Prosegur Alarmas |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments accounted for by the equity method | € 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prosegur Soluciones S.A.U. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments accounted for by the equity method | € 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Buendía Estudios, S.L. Service provision related to film and video production activities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments accounted for by the equity method | € 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Buendia Estudios Uno, S.L.U. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments accounted for by the equity method | € 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Buendia Estudios Dos, S.L.U. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments accounted for by the equity method | € 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Buendía Estudios Canarias S.L.U. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments accounted for by the equity method | € 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Buendia Estudios Bizkaia, S.L. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments accounted for by the equity method | € 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Solar360 de Repsol y Movistar S.L. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments accounted for by the equity method | € 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
UGG TopCo/HoldCo General Partner GmbH. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 49.68% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments accounted for by the equity method | € 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
UGG TopCo/HoldCo General Partner GmbH. | Telefónica Deutschland Holding A.G. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 9.68% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
UGG TopCo/HoldCo General Partner GmbH. | Telefónica Infra Germany GmbH Broadband telecommunications operator |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 40.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital increase of UGG TopCo (Note 10) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 49.68% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments accounted for by the equity method | € 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital increase of UGG TopCo (Note 10) | Telefónica Deutschland Holding A.G. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 9.68% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital increase of UGG TopCo (Note 10) | Telefónica Infra Germany GmbH Broadband telecommunications operator |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 40.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
UGG HoldCo GmbH& Co KG |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 49.68% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments accounted for by the equity method | € 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
UGG General Partner GmbH |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 49.68% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments accounted for by the equity method | € 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsere Grüne Glasfaser (UGG) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 49.68% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments accounted for by the equity method | € 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Infrafibre Germany GmbH |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 49.68% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments accounted for by the equity method | € 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Daytona Midco, S.L. (Nabiax) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 20.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments accounted for by the equity method | € 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Digital Data Centre BidCo, SLU. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 20.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments accounted for by the equity method | € 4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Telefónica Renting, S.A. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments accounted for by the equity method | € 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Opal Holdco Limited |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments accounted for by the equity method | £ |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |
Opal Jvco Limited (nexfibre) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 25.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments accounted for by the equity method | £ |  |  |  |  |  |  |  |  |  |  | £ 4 |  |  |  |  |  |  |  |  |  |
Utiq, S.A. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 25.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments accounted for by the equity method | € 22 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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