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Goodwill - Allocation of Goodwill to Cash-Generating Units (Details) - Goodwill (Note 7) - EUR (€) € in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets and goodwill | € 16,461 | € 18,708 | € 18,471
Telefónica Spain | Operating segments |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets and goodwill | 4,291 | 4,291 | 4,291
Telefónica Brazil | Operating segments |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets and goodwill | 6,740 | 8,076 | 7,752
Telefónica Germany | Operating segments |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets and goodwill | 4,386 | 4,386 | 4,386
Telefónica Hispam | Operating segments |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets and goodwill | 418 | 1,108 | 1,215
Telefónica Hispam | Operating segments | Colombia |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets and goodwill | 136 | 164 |
Telefónica Hispam | Operating segments | Ecuador |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets and goodwill | 79 | 75 |
Telefónica Hispam | Operating segments | Chile |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets and goodwill | 179 | 615 |
Telefónica Hispam | Operating segments | Peru |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets and goodwill | 0 | 229 |
Telefónica Hispam | Operating segments | Uruguay |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets and goodwill | 22 | 23 |
Telefónica Hispam | Operating segments | Others T. Hispam |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets and goodwill | 2 | 2 |
Other companies | Operating segments |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets and goodwill | 626 | 847 | € 827
Other companies | Operating segments | Telefonica Tech UK & Ireland, Limited |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets and goodwill | 268 | 438 |
Other companies | Operating segments | BE-terna |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets and goodwill | 230 | 282 |
Other companies | Operating segments | Others |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets and goodwill | € 128 | € 127 |

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