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Goodwill - Allocation of Goodwill to Cash-Generating Units (Details) - Goodwill - EUR (€)
€ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of detailed information about intangible assets [line items]      
Intangible assets and goodwill € 18,471 € 16,519 € 17,044
Telefónica Spain | Operating segments      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets and goodwill 4,291 4,291 4,299
Telefónica Brazil | Operating segments      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets and goodwill 7,752 6,278 6,258
Telefónica Germany | Operating segments      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets and goodwill 4,386 4,386 4,558
Telefónica Hispam | Operating segments      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets and goodwill 1,215 1,166 1,778
Telefónica Hispam | Operating segments | Colombia      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets and goodwill 135 154  
Telefónica Hispam | Operating segments | Ecuador      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets and goodwill 137 129  
Telefónica Hispam | Operating segments | Chile      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets and goodwill 652 622  
Telefónica Hispam | Operating segments | Peru      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets and goodwill 265 239  
Telefónica Hispam | Operating segments | Uruguay      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets and goodwill 23 20  
Telefónica Hispam | Operating segments | Others T. Hispam      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets and goodwill 3 2  
Other companies | Operating segments      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets and goodwill 827 398 € 151
Other companies | Operating segments | Telefónica Tech UK & Ireland      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets and goodwill 429 288  
Other companies | Operating segments | BE-terna      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets and goodwill 279 0  
Other companies | Operating segments | Others      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets and goodwill € 119 € 110