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Appendix VI: Key Regulatory Issues and Concessions and Licenses Held by the Telefonica Group - Narrative (Details)
 1 Months Ended 12 Months Ended
Jan. 01, 2023
Dec. 21, 2022
EUR (€)
Sep. 21, 2021
state
Feb. 22, 2021
EUR (€)
Dec. 11, 2018
Jan. 10, 2017
Aug. 30, 2016
Apr. 27, 2016
Jul. 31, 2021
EUR (€)
Apr. 30, 2021
EUR (€)
Jul. 31, 2013
Aug. 31, 2009
Dec. 31, 2023
EUR (€)
megabyte_per_second
Dec. 31, 2022
euroPerMinute
Oct. 07, 2021
municipality
Oct. 06, 2021
municipality
Dec. 31, 2020
market
Nov. 30, 2020
market
Disclosure of detailed information about service concession arrangements [abstract]                                    
EECC, period to transpose         2 years                          
EECC, harmonization of licenses, period         20 years                          
European Commission infringement proceedings, number of member states | state     18                              
Relevant Market Recommendation, markets susceptible to ex ante regulation | market                                 2 4
EC maximum mobile termination rate                   € 0.2                
EC maximum fixed termination rate                   € 0.07                
European Council, Recovery And Resilience Mechanism, funds                         € 750,000,000,000          
European Council, Recovery And Resilience Mechanism, percentage of funds devoted to digitalization                         20.00%          
Regulations on digital services, potential fine on total worldwide turnover, first offense                         10.00%          
Regulations on digital services, potential fine on total worldwide turnover, repeat offense                         20.00%          
Percentage of fines issued by the general data protection regulation               4.00%                    
Percentage of fines issued           4.00%                        
New broadband ethernet service, monthly rate                         € 16.68          
Broadband market analysis, new generation networks, number of municipalities | municipality                             696 66    
Broadband market analysis, new generation networks, percentage of municipalities where Spanish population lives                             70.50%      
Spectrum license acquisition, term                 6 months       40 years          
Spectrum license acquisition, amount paid   € 20,000,000   € 21,000,000         € 310,000,000                  
Percentage of fixed annual provision of invoiced operating income 0.90%                     0.90%            
Percentage of gross revenue for open concessionaire companies                       3.00%            
Percentage of gross revenue for open concessionaire companies to provide pay TV services                       1.50%            
Speed of network infrastructure access for data transmission in copper pairs or coaxial cables (Mbit per second) | megabyte_per_second                         12          
Speed of wholesale fixed network infrastructure to transport local and long distance transmission (Mbit per second) | megabyte_per_second                         34          
Percentage of foreign direct investment allowed                     100.00%              
Percentage of increase in administrative fines             30.00%                      
Tariffs amount, (in Euro per minute) | euroPerMinute                           0.55        
Period of applicable tariffs for services provided                         5 years          
Period for termination of SMP operator obligations                         6 months          
Fixed switched telephony services, obligation, term                         5 years