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Other Current Financial Assets - Narrative (Details)
€ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2024
EUR (€)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
EUR (€)
Dec. 31, 2022
EUR (€)
Dec. 31, 2024
USD ($)
Disclosure of financial assets [line items]          
Current financial assets € 1,800   € 1,078    
Other income 1,692   1,541 € 2,065  
Finance income 980   1,099 € 1,803  
Short-term credits          
Disclosure of financial assets [line items]          
Current financial assets 893   192    
Other income 358 $ 380      
Finance income 154 $ 164      
Deposits and guarantees          
Disclosure of financial assets [line items]          
Current financial assets 139   209    
Other current financial assets - short-term investments          
Disclosure of financial assets [line items]          
Current financial assets 228   187    
American Tower Cooperation | Short-term credits          
Disclosure of financial assets [line items]          
Current financial assets 90        
Republic of Colombia | Short-term credits          
Disclosure of financial assets [line items]          
Current financial assets 523       $ 544
Telefónica, S.A.          
Disclosure of financial assets [line items]          
Current financial assets 1,800   1,078    
Telefónica, S.A. | Deposits and guarantees          
Disclosure of financial assets [line items]          
Current financial assets € 39   € 50