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Cash Flow Detail - Investing Activities Narrative (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of geographical areas [line items]      
Spectrum license payments € 46 € 128 € 27
Telefónica Móviles del Uruguay, S.A. Wireless communications and services operator      
Disclosure of geographical areas [line items]      
Spectrum license payments 23    
Otecel, S.A. Wireless communications services provider      
Disclosure of geographical areas [line items]      
Spectrum license payments € 21    
Telefónica Móviles Argentina, S.A. Telecommunications service provider      
Disclosure of geographical areas [line items]      
Spectrum license payments   97 11
Telefónica Móviles España, S.A.U. Wireless communications services provider      
Disclosure of geographical areas [line items]      
Spectrum license payments   € 20 € 8