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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

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