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Goodwill - Allocation of Goodwill to Cash-Generating Units (Details) - Goodwill (Note 7) - EUR (€)
€ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of detailed information about intangible assets [line items]      
Intangible assets and goodwill € 16,461 € 18,708 € 18,471
Telefónica Spain | Operating segments      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets and goodwill 4,291 4,291 4,291
Telefónica Brazil | Operating segments      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets and goodwill 6,740 8,076 7,752
Telefónica Germany | Operating segments      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets and goodwill 4,386 4,386 4,386
Telefónica Hispam | Operating segments      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets and goodwill 418 1,108 1,215
Telefónica Hispam | Operating segments | Colombia      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets and goodwill 136 164  
Telefónica Hispam | Operating segments | Ecuador      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets and goodwill 79 75  
Telefónica Hispam | Operating segments | Chile      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets and goodwill 179 615  
Telefónica Hispam | Operating segments | Peru      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets and goodwill 0 229  
Telefónica Hispam | Operating segments | Uruguay      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets and goodwill 22 23  
Telefónica Hispam | Operating segments | Others T. Hispam      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets and goodwill 2 2  
Other companies | Operating segments      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets and goodwill 626 847 € 827
Other companies | Operating segments | Telefonica Tech UK & Ireland, Limited      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets and goodwill 268 438  
Other companies | Operating segments | BE-terna      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets and goodwill 230 282  
Other companies | Operating segments | Others      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets and goodwill € 128 € 127