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Equity - Equity Attributable To Non-Controlling Interest Narrative (Details) - EUR (€) € in Millions |  |  |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Mar. 24, 2023 | Feb. 01, 2023 | Jan. 31, 2023 | Dec. 20, 2022 | Dec. 31, 2023 | Jan. 31, 2023 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of reserves within equity [line items] |  |  |  |  |  |  |  |  |
Acquisitions and disposals of non-controlling interests and business combinations (Notes 2 and 17) |  |  |  |  |  |  | € 1,438 | € 1,579 | € (781)
Pontegadea Inversiones, S.L. |  |  |  |  |  |  |  |  |
Disclosure of reserves within equity [line items] |  |  |  |  |  |  |  |  |
Cash received from income taxes receivable |  |  | € 88 |  |  | € 88 |  |  |
Cash received from income taxes receivable (in percentage) |  |  | 9.99% |  |  | 9.99% |  |  |
Pontel Participaciones, S.L. Holding company |  |  |  |  |  |  |  |  |
Disclosure of reserves within equity [line items] |  |  |  |  |  |  |  |  |
Share capital amount |  |  | € 111 |  |  | € 111 |  |  |
Pontel Participaciones, S.L. Holding company | Telxius Telecom, S.A. |  |  |  |  |  |  |  |  |
Disclosure of reserves within equity [line items] |  |  |  |  |  |  |  |  |
Percentage of voting equity interests acquired |  |  | 40.00% |  |  | 40.00% |  |  |
Proportion of voting rights held in associate (in percentage) |  |  | 60.00% |  |  |  |  |  |
KKR Alameda Aggregator L.P. |  |  |  |  |  |  |  |  |
Disclosure of reserves within equity [line items] |  |  |  |  |  |  |  |  |
Cash received from income taxes receivable |  |  | € 351 |  |  | € 351 |  |  |
Cash received from income taxes receivable (in percentage) |  |  | 40.00% |  |  | 40.00% |  |  |
KKR Alameda Aggregator L.P. | Telxius Telecom, S.A. |  |  |  |  |  |  |  |  |
Disclosure of reserves within equity [line items] |  |  |  |  |  |  |  |  |
Percentage of voting equity interests acquired |  |  |  |  |  |  | 40.00% |  |
Total |  |  |  |  |  |  |  |  |
Disclosure of reserves within equity [line items] |  |  |  |  |  |  |  |  |
Increase (decrease) through disposal of subsidiary, equity | € 46 |  |  |  |  |  |  |  |
Acquisitions and disposals of non-controlling interests and business combinations (Notes 2 and 17) |  |  |  |  |  |  | € (12) | 0 | (936)
Non-controlling interests |  |  |  |  |  |  |  |  |
Disclosure of reserves within equity [line items] |  |  |  |  |  |  |  |  |
Increase (decrease) through disposal of subsidiary, equity | € 585 |  |  |  |  |  |  |  |
Acquisitions and disposals of non-controlling interests and business combinations (Notes 2 and 17) |  |  |  |  |  |  | 1,450 | € 1,579 | 155
Telefónica Deutschland Holding A.G. |  |  |  |  |  |  |  |  |
Disclosure of reserves within equity [line items] |  |  |  |  |  |  |  |  |
Increase (decrease) through disposal of subsidiary, equity |  |  |  |  | € (816) |  | (1,019) |  |
Telefónica Deutschland Holding A.G. | Total |  |  |  |  |  |  |  |  |
Disclosure of reserves within equity [line items] |  |  |  |  |  |  |  |  |
Acquisitions and disposals of non-controlling interests and business combinations (Notes 2 and 17) |  |  |  |  |  |  | (28) |  |
Telefónica Deutschland Holding A.G. | Non-controlling interests |  |  |  |  |  |  |  |  |
Disclosure of reserves within equity [line items] |  |  |  |  |  |  |  |  |
Acquisitions and disposals of non-controlling interests and business combinations (Notes 2 and 17) |  |  |  |  |  |  | € 1,057 |  |
Pontel Participaciones, S.L. Holding company |  |  |  |  |  |  |  |  |
Disclosure of reserves within equity [line items] |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) |  | 70.00% | 83.35% |  |  |  |  |  |
Pontel Participaciones, S.L. Holding company | Pontegadea Inversiones, S.L. |  |  |  |  |  |  |  |  |
Disclosure of reserves within equity [line items] |  |  |  |  |  |  |  |  |
Proportion of voting rights held in subsidiary (as a percent) |  | 30.00% | 16.65% |  |  |  |  |  |
Telxius Telecom, S.A. |  |  |  |  |  |  |  |  |
Disclosure of reserves within equity [line items] |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) |  |  |  |  |  |  | 70.00% |  |
Percentage of voting equity interests acquired |  |  |  |  | 40.00% |  |  | 40.00% |
Increase (decrease) in income taxes receivable |  |  |  |  |  | € 876 |  |  |
Bluevia Fibra S.L.U. |  |  |  |  |  |  |  |  |
Disclosure of reserves within equity [line items] |  |  |  |  |  |  |  |  |
Increase (decrease) through disposal of subsidiary, equity |  |  |  |  |  |  |  |  | € (23)
Proportion of ownership interest (as a percent) |  |  |  |  |  |  | 55.00% |  |
Bluevia Fibra S.L.U. | Vauban/CAA |  |  |  |  |  |  |  |  |
Disclosure of reserves within equity [line items] |  |  |  |  |  |  |  |  |
Proportion of voting rights held in subsidiary (as a percent) |  |  |  | 45.00% |  |  |  |  |
Proportion of voting rights held in associate (in percentage) |  |  |  | 45.00% |  |  |  |  |
Bluevia Fibra S.L.U. | Non-controlling interests |  |  |  |  |  |  |  |  |
Disclosure of reserves within equity [line items] |  |  |  |  |  |  |  |  |
Acquisitions and disposals of non-controlling interests and business combinations (Notes 2 and 17) |  |  |  | € (23) |  |  |  |  |

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