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Intangible Assets - Narrative (Details)
€ in Millions, R$ in Millions
 12 Months Ended
Dec. 31, 2022
EUR (€)
Dec. 31, 2021
EUR (€)
Dec. 31, 2021
BRL (R$)
Apr. 20, 2022
EUR (€)
Disclosure of detailed information about intangible assets [line items]        
Transfers and others € 204 € 215    
Additions 1,530 2,410    
Impairments 31      
Oi Group        
Disclosure of detailed information about intangible assets [line items]        
Intangible assets       € 539
Incremental Group        
Disclosure of detailed information about intangible assets [line items]        
Intangible assets       24
BE-terna Group        
Disclosure of detailed information about intangible assets [line items]        
Intangible assets       € 77
Service concession arrangements and licenses        
Disclosure of detailed information about intangible assets [line items]        
Additions 173 1,704    
Transfers and others 0 197    
Additions 173 1,188    
Impairments 19      
Service concession arrangements and licenses | Telefónica Spain        
Disclosure of detailed information about intangible assets [line items]        
Additions   352    
Licences And Computer Software        
Disclosure of detailed information about intangible assets [line items]        
Impairments 21      
Telefónica Hispam | Service concession arrangements and licenses        
Disclosure of detailed information about intangible assets [line items]        
Additions 125 131    
Telefónica Brazil | Service concession arrangements and licenses        
Disclosure of detailed information about intangible assets [line items]        
Additions € 35      
Additions   700 R$ 4,459  
Telefónica Brazil | Service concession arrangements and licenses | ANATEL        
Disclosure of detailed information about intangible assets [line items]        
Additions   146 929  
Telefónica Brazil | Service concession arrangements and licenses | EAF        
Disclosure of detailed information about intangible assets [line items]        
Additions   330 2,104  
Telefónica Brazil | Service concession arrangements and licenses | EACE        
Disclosure of detailed information about intangible assets [line items]        
Additions   224 R$ 1,426  
Telefónica United Kingdom | Service concession arrangements and licenses        
Disclosure of detailed information about intangible assets [line items]        
Additions   515    
Telefónica Móviles El Salvador | Service concession arrangements and licenses        
Disclosure of detailed information about intangible assets [line items]        
Transfers and others   € 38