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Tax Matters - Tax Deductibility, Inspections in Spain Narrative (Details) - EUR (€) € in Millions |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 27, 2023 | Mar. 31, 2019 | Dec. 31, 2024 | Dec. 31, 2023 | Oct. 24, 2022
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |
Positive tax effect of impairment of goodwill |  |  | € 2,368.0 |  |
Amortized goodwill for tax purposes |  |  | 480.0 | € 419.0 |
2008-2011 Inspection Procedure |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |
Tax refund, receivable from tax paid |  |  |  |  | € 790.0
Tax refund, interest receivable from tax paid |  |  |  |  | € 526.0
Spain |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |
Proceeds from favorable tax appeal |  | € 13.4 |  |  |
Telefónica Spain |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |
Tax credits recognized | € 334.0 |  | € 334.0 |  |

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