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Cash Flow Detail - Investing Activities (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of geographical areas [line items]      
Proceeds from the sale in property, plant and equipment and intangible assets € 310 € 842 € 564
Payments on investments in property, plant and equipment and intangible assets (6,161) (6,350) (6,728)
(Payments on investments)/proceeds from the sale in property, plant and equipment and intangible assets (5,851) (5,508) (6,164)
Spectrum license payments 128 27 999
Telefónica Móviles Argentina, S.A. Telecommunications service provider      
Disclosure of geographical areas [line items]      
Spectrum license payments 97 11  
Telefónica de España, S.A.U. Telecommunications service provider      
Disclosure of geographical areas [line items]      
Spectrum license payments € 20 € 8  
Telefónica United Kingdom      
Disclosure of geographical areas [line items]      
Spectrum license payments     521
Telefónica Spain      
Disclosure of geographical areas [line items]      
Spectrum license payments     343
Telefonica Chile      
Disclosure of geographical areas [line items]      
Spectrum license payments     € 131