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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
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