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Tax Matters - Main Changes Narrative (Details) € in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
Dec. 27, 2023 EUR (€) | Sep. 27, 2023 EUR (€) | Dec. 31, 2024 EUR (€) company | Dec. 31, 2023 EUR (€) company | Dec. 31, 2022 EUR (€)
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |
Number of consolidated tax group companies | company |  |  | 47 | 45 |
Increase/(decrease) in tax expense arising from temporary differences |  |  | € 599 | € 11 | € 43
Deferred tax assets |  |  | 6,673 | 6,240 | 4,884
Deferred tax liabilities |  |  | 2,905 | 2,702 | 3,067
Corporate income tax |  |  | (348) | 899 | € (641)
Peru |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |
Reversal of deferred tax assets |  |  | 91 |  |
Telefónica Argentina |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |
Disposal of tax liability |  |  | 332 |  |
Addition deferred tax asset |  |  | 141 |  |
Telefónica Germany |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |
Tax credits recognized |  |  | 127 |  |
Applied tax loss carryforwards |  |  | 60 | 41 |
Tax liabilities additions |  |  | 40 |  |
Disposal of tax liability |  |  |  | 18 |
Adjustments for current tax of prior periods |  |  | 127 | 115 |
Group 3G UMTS Holding GmbH Holding Company |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |
Tax credits recognized |  |  | 106 | 73 |
Applied tax loss carryforwards |  |  | 83 | 79 |
Telefónica Brazil |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |
Disposal of deferred tax assets |  |  | 4 | 61 |
Applied tax loss carryforwards |  |  | 65 | 60 |
Deferred tax assets |  |  | 3 | 23 |
Deferred tax liabilities |  |  | 178 | 119 |
Disposal of tax liability |  |  | 140 | 266 |
Telefonica Chile |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |
Disposal of deferred tax assets |  |  | 38 | 18 |
Deferred tax assets |  |  | 70 | 94 |
Deferred tax liabilities |  |  | 8 | 48 |
Disposal of tax liability |  |  | 24 | 28 |
Telefonica Colombia |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |
Disposal of deferred tax assets |  |  | 11 | 66 |
Deferred tax assets |  |  | 45 | 9 |
Disposal of tax liability |  |  |  | 13 |
Subsidiaries |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |
Deferred tax liabilities |  |  | 156 | 258 |
Temporary differences associated with investments in subsidiaries, branches and associates and interests in joint arrangements for which deferred tax liabilities have not been recognised |  |  | 330 | 233 |
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 |  |
Deferred tax relating to items credited (charged) directly to equity |  |  | (29) | (2) |
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 relating to items credited (charged) directly to equity |  |  | 115 | 194 |
Telefónica Spain |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |
Increase (decrease) through restructuring, deferred tax liability (asset) |  |  | 78 | 412 |
Disposal of deferred tax assets |  |  | 255 | 208 |
Deferred tax assets, temporary difference | € 306 |  | 218 |  |
Tax credits recognized |  | € 334 | € 334 |  |
Increase (decrease) in deferred tax liability (asset) |  |  |  | 541 |
Corporate income tax |  |  |  | € 541 |

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