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Other Current Financial Assets - Narrative (Details)
€ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2021
EUR (€)
Dec. 31, 2022
EUR (€)
Dec. 31, 2022
USD ($)
Disclosure of financial assets [line items]      
Other current financial assets € 3,835 € 2,444  
Contractual limit amount 84,794 83,706  
Spire Notes      
Disclosure of financial assets [line items]      
Contractual limit amount 1,000 939 $ 1,000
Other current financial assets 591 939  
Other long-term credits € 295    
Short-term credits - bank deposits      
Disclosure of financial assets [line items]      
Maturity of short-term credits 1 month    
Other current financial assets   1,190  
Deposits and guarantees      
Disclosure of financial assets [line items]      
Other current financial assets € 760 439  
Other current financial assets - short-term investments      
Disclosure of financial assets [line items]      
Other current financial assets 105 126  
Telefónica Brazil | Deposits and guarantees      
Disclosure of financial assets [line items]      
Other current financial assets 17 106  
Telefónica Emisiones, S.A.U. | Deposits and guarantees      
Disclosure of financial assets [line items]      
Other current financial assets € 433    
Minimum maturity of short-term deposits and guarantees 90 days    
Telefónica, S.A.      
Disclosure of financial assets [line items]      
Other current financial assets € 3,835 2,444  
Telefónica, S.A. | Deposits and guarantees      
Disclosure of financial assets [line items]      
Other current financial assets € 150 € 232