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Tax Matters - Reconciliation of Profit Narrative (Details) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Increase/(decrease) in tax expense arising from temporary differences | € 599 | € 11 | € 43
Tax effect of other permanent differences | (165) | (442) | 793
Corporate income tax | 348 | (899) | 641
Telecommunications Law, Law 14.195 |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Tax effect of other permanent differences |  |  | 651
Deferred tax assets |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Increase/(decrease) in tax expense arising from temporary differences | 410 |  |
Deferred tax liabilities |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Increase/(decrease) in tax expense arising from temporary differences | 535 |  |
Reconciliation Share Of Loss Of VMO2 |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Tax effect of other permanent differences |  | 477 |
Telefónica, S.A. |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Reversal of deferred tax assets for tax credits | 236 | 173 | 112
Unrecorded tax loss carryforwards | 174 | 368 | 326
Reversal of deferred tax assets for tax loss carryforwards |  |  | 85
Telefónica Germany |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Tax credits recognized |  | 115 | 76
Telefónica Germany | Deferred tax assets |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Reversal of deferred tax assets |  | 334 |
Group 3G UMTS Holding GmbH |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Tax credits recognized | € 106 | € 73 | 76
Group 3G UMTS Holding GmbH Holding Company | Tax Expense (Income) |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Unused provision reversed, other provisions |  |  | 186
Group 3G UMTS Holding GmbH Holding Company | Finance Income |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Unused provision reversed, other provisions |  |  | 69
Telefónica Peru | Tribunal Economico-Administrativo Central - Overpayments in 2008-2011 |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Corporate income tax |  |  | € 241

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