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Operations Classified as Held for Sale - Narrative (Details) - EUR (€) € in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Nov. 08, 2024 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Jul. 06, 2023
Disclosure of subsidiaries [line items] |  |  |  |  |
Transfers and others |  | € 104 | € (170) |  |
Goodwill impairment |  | € 866 | 58 | € 0 |
Daytona Midco, S.L. (Nabiax) |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |
Proportion of ownership interest in associate (as a percent) | 20.00% | 20.00% |  |  |
Fiber optic assets in Peru |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |
Transfers and others |  | € 118 | € (163) |  |
Goodwill impairment |  | 34 |  |  |
Pangea |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |
Impairment loss, property, plant and equipment |  | 108 |  |  |
Reversal of deferred tax assets |  | € 13 |  |  |
Telefónica Hispam | Affiliate Of Kohlberg Kravis Roberts |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |
Percentage of voting equity interests acquired |  |  |  |  | 54.00%
Telefónica Hispam | Entel Perú |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |
Percentage of voting equity interests acquired |  |  |  |  | 10.00%
Asterion Industrial Partners SGEIC | Aermont Group | Nabiax |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |
Percentage of share capital sold | 80.00% |  |  |  |

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