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Tax Matters - Constitutional Court Narrative (Details) - EUR (€) € in Millions |  | 12 Months Ended
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Sep. 27, 2023 | Dec. 31, 2024
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Tax credit expected, loss carryforwards of 2002 |  | € 247
Tax credit expected, loss carryforwards of 2004 |  | 21
Tax credit expected, loss carryforwards of 2011 |  | 615
Tax credit expected, loss carryforwards of 2015 |  | 1,503
Tax credit expected, deductions for double taxation |  | 952
Tax credit expected, deductions for reinvestments |  | 23
Tax credit expected, deductions for investments |  | 476
Tax credit expected, deductions for donations |  | 260
Tax credit expected, deductions for fixed assets |  | 101
Tax credit expected, deductions for reversal of temporary measures |  | 29
Telefónica Spain |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Tax credits recognized | € 334 | € 334

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