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Appendix V: Interest-Bearing Debt (Details)
€ in Millions, $ in Millions, $ in Millions
Dec. 31, 2024
EUR (€)
Dec. 31, 2024
USD ($)
Dec. 31, 2024
COP ($)
Dec. 31, 2023
EUR (€)
Dec. 31, 2023
USD ($)
Dec. 31, 2023
COP ($)
Telefonica, S.A. | Structured Financing Due March 11, 2026, One            
Disclosure of detailed information about borrowings [line items]            
Contractual limit amount credit facility | $   $ 62        
Borrowings | $   59     $ 136  
Telefonica, S.A. | Structured Financing Due March 11, 2026, Two            
Disclosure of detailed information about borrowings [line items]            
Contractual limit amount credit facility € 42          
Borrowings 42     € 101    
Telefonica, S.A. | Sustainable Syndicated due Jan 13, 2029            
Disclosure of detailed information about borrowings [line items]            
Contractual limit amount credit facility 5,500          
Borrowings 0     0    
Telefonica, S.A. | Bilateral Loan Due December 15, 2032            
Disclosure of detailed information about borrowings [line items]            
Contractual limit amount credit facility 0          
Borrowings 150     150    
Telefonica, S.A. | Bilateral Loan Due June 15, 2033            
Disclosure of detailed information about borrowings [line items]            
Contractual limit amount credit facility 0          
Borrowings 125     125    
Telefonica, S.A. | Bilateral Loan Due September 29, 2033            
Disclosure of detailed information about borrowings [line items]            
Contractual limit amount credit facility 0          
Borrowings 150     150    
Telefonica, S.A. | Bilateral Loan Due July 31, 2034            
Disclosure of detailed information about borrowings [line items]            
Contractual limit amount credit facility 0          
Borrowings 150     0    
Telefonica, S.A. | Bilateral Loan Due October 31, 2031            
Disclosure of detailed information about borrowings [line items]            
Contractual limit amount credit facility 0          
Borrowings 140     0    
Telefonica, S.A. | Bilateral Loan Due December 16, 2031            
Disclosure of detailed information about borrowings [line items]            
Contractual limit amount credit facility 0          
Borrowings 100     0    
Telefónica Germany GmbH & Co. OHG Wireless communications services operator | BEI Financing due June 13, 2025            
Disclosure of detailed information about borrowings [line items]            
Contractual limit amount credit facility 0          
Borrowings 33     108    
Telefónica Germany GmbH & Co. OHG Wireless communications services operator | Syndicated Loan Due December 17, 2026            
Disclosure of detailed information about borrowings [line items]            
Contractual limit amount credit facility 750          
Borrowings 0     0    
Telefónica Germany GmbH & Co. OHG Wireless communications services operator | BEI Financing (Tranche 1) due June 18, 2029            
Disclosure of detailed information about borrowings [line items]            
Contractual limit amount credit facility 0          
Borrowings 250     300    
Telefónica Germany GmbH & Co. OHG Wireless communications services operator | BEI Financing (Tranche 2) due July 14, 2029            
Disclosure of detailed information about borrowings [line items]            
Contractual limit amount credit facility 0          
Borrowings 125     150    
Colombia Telecomunicaciones | Bilateral loan due March 19, 2025            
Disclosure of detailed information about borrowings [line items]            
Contractual limit amount credit facility | $     $ 0      
Borrowings | $     $ 109     $ 118
Bluevia Fibra S.L.U. | Syndicated Loan Due December 20, 2029            
Disclosure of detailed information about borrowings [line items]            
Contractual limit amount credit facility 360          
Borrowings 325     250    
Telxius Telecom, S.A. | Syndicated Loan Due December 04, 2029            
Disclosure of detailed information about borrowings [line items]            
Contractual limit amount credit facility 145          
Borrowings € 100     € 100    
Telefónica Móviles Chile, S.A. | Bilateral Loan Due August 22, 2026            
Disclosure of detailed information about borrowings [line items]            
Contractual limit amount credit facility | $   0        
Borrowings | $   $ 125     $ 116