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Revenue and Expenses - Other Expenses Narrative (Details) € in Millions, R$ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 EUR (€) | Dec. 31, 2024 BRL (R$) | Dec. 31, 2023 EUR (€) | Dec. 31, 2022 EUR (€)
Disclosure of transactions between related parties [line items] |  |  |  |
Goodwill impairment (Note 7) | € 866 |  | € 58 | € 0
Losses on disposal of fixed assets, losses on operations classified as held for sale and sale of assets | 1,525 |  | 33 | 124
Other operating expenses | 165 |  | 370 | 273
Pangea |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Impairment loss, property, plant and equipment | 108 |  |  |
Telefónica del Perú, S.A. |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Losses on disposal of fixed assets, losses on operations classified as held for sale and sale of assets | 54 |  |  |
Telefónica Argentina |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Losses on disposal of fixed assets, losses on operations classified as held for sale and sale of assets | 1,274 |  |  | 77
Telefonica Brasil |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Other operating expenses | 67 | R$ 386 |  |
Reduction to tax expense due to decisions with tax authorities |  |  | 51 | € 73
Telefonica Tech UK & Ireland, Limited |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Goodwill impairment (Note 7) | 192 |  |  |
BE-terna |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Goodwill impairment (Note 7) | 51 |  |  |
Fiber optic assets in Peru |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Goodwill impairment (Note 7) | 34 |  |  |
Peru |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Goodwill impairment (Note 7) | 226 |  |  |
Peru | Telefónica Hispam |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Goodwill impairment (Note 7) | 226 |  |  |
Peru | Fiber optic assets in Peru |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Goodwill impairment (Note 7) | 34 |  |  |
Chile | Telefónica Hispam |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Goodwill impairment (Note 7) | € 397 |  |  |
Ecuador | Telefónica Hispam |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Goodwill impairment (Note 7) |  |  | € 58 |

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