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Basis of Presentation of the Consolidated Financial Statements - Agreement between Telefonica de Espana (Details) - EUR (€) € in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Dec. 20, 2022 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Apr. 20, 2022
Disclosure of subsidiaries [line items] |  |  |  |  |
Increase (decrease) in equity through change in equity of equity holders |  | € (1,438) | € (1,579) | € 781 |
Deferred tax assets |  | 6,673 | 6,240 | 4,884 |
Deferred tax assets for temporary differences |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |
Deferred tax assets |  | 5,295 | 5,586 |  |
Retained earnings |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |
Increase (decrease) in equity through change in equity of equity holders |  | 12 |  | 936 |
Non-controlling interests |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |
Increase (decrease) in equity through change in equity of equity holders |  | € (1,450) | (1,579) | € (155) |
Bluevia Fibra S.L.U. | Deferred tax assets for temporary differences |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |
Deferred tax assets |  |  | € 548 |  |
Bluevia Fibra S.L.U. | Retained earnings |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |
Increase (decrease) in equity through change in equity of equity holders | € 986 |  |  |  |
Bluevia Fibra S.L.U. | Non-controlling interests |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |
Increase (decrease) in equity through change in equity of equity holders | € 23 |  |  |  |
Vauban/CAA | Bluevia Fibra S.L.U. |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |
Proportion of voting rights held in associate (in percentage) | 45.00% |  |  |  |
Total |  |  |  |  | € 1,021

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