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Appendix VI: Key Regulatory Issues and Concessions and Licenses Held by the Telefonica Group - Narrative (Details)
$ in Millions
 1 Months Ended 12 Months Ended
Dec. 20, 2023
COP ($)
Jul. 24, 2023
Jan. 01, 2023
Dec. 21, 2022
EUR (€)
Oct. 19, 2021
Oct. 02, 2021
Feb. 22, 2021
EUR (€)
Jul. 30, 2020
Dec. 11, 2018
Jan. 10, 2017
Apr. 27, 2016
Apr. 22, 2015
route
Jul. 31, 2024
COP ($)
May 31, 2024
Jan. 31, 2023
station
Nov. 30, 2021
Jul. 31, 2021
EUR (€)
Apr. 30, 2021
EUR (€)
Nov. 30, 2020
market
Jul. 31, 2013
Aug. 31, 2009
Dec. 31, 2024
EUR (€)
megabyte_per_second
process
Oct. 07, 2021
municipality
Oct. 06, 2021
municipality
Jun. 17, 2021
market
Dec. 31, 2020
market
Disclosure of detailed information about service concession arrangements [abstract]                                                    
EECC, harmonization of licenses, period                 20 years                                  
Relevant Market Recommendation, markets susceptible to ex ante regulation | market                                     4             2
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% 4.00%                              
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                               20 years           40 years        
Spectrum license acquisition, amount paid       € 20,000,000     € 21,000,000                   € 310,000,000                  
Period for termination of SMP operator obligations                                           6 months        
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%          
Acquisition of DTS, prohibition to attract DTS customer, period                       2 months                            
Acquisition of DTS, number of international routes to keep | route                       3                            
Acquisition of DTS, prohibition of formalizing exclusive contracts, maximum contract term               3 years       3 years                            
Specturm's frequency usage rights, extended transition period                           5 years                        
Number of 5G Base Stations | station                             1,000                      
Number of white spots in base stations | station                             500                      
Spectrum agreement, percentage of geographic coverage percentage by 2024                                           88.00%        
Spectrum agreement, percentage of geographic coverage percentage by 2026                                           90.00%        
Spectrum agreement, annual license fee reduction percentage                                           14.80%        
License agreement, validation term   120 days                                                
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%            
Fixed switched telephony services, obligation, term                                           5 years        
License agreement, concession period           30 years                         20 years              
Number of regional market as important provider of services | market                                                 10  
5G project, implementation term, stage one           12 months                                        
5G project, implementation term, stage two           24 months                                        
5G project, implementation term, stage three           36 months                                        
Period of applicable tariffs for services provided                                           5 years        
Possible term extension         20 years                                          
Payment to renew spectrum license | $                         $ 132,437                          
Regulatory operations, license acquisition, reserve value | $ $ 318,000                                                  
License acquisition, maximum connection execution term 18 months                                                  
License acquisition, extendable connection execution term 24 months                                                  
License acquisition, amount to be recognized for obligations | $ $ 69,000                                                  
Number of concession renewal processes | process                                           6