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Tax Matters - Tax Litigation in Telefonica Brazil and Peru Narrative (Details) € in Millions, S/ in Millions, R$ in Millions | 6 Months Ended | 12 Months Ended |  |  |
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Jun. 30, 2024 EUR (€) | Jun. 30, 2024 BRL (R$) | Jun. 30, 2024 PEN (S/) | Dec. 31, 2024 EUR (€) yr | Dec. 31, 2024 BRL (R$) | Dec. 31, 2024 PEN (S/) | Dec. 31, 2023 EUR (€) | Dec. 31, 2023 BRL (R$) | Dec. 31, 2023 PEN (S/) | Dec. 31, 2024 BRL (R$) yr | Dec. 31, 2024 PEN (S/) yr | Dec. 31, 2023 BRL (R$) | Dec. 31, 2023 PEN (S/) | Dec. 31, 2022 yr
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Losses on litigation settlements |  |  |  | € 4,002 | R$ 25,760 |  | € 4,323 | R$ 23,130 |  |  |  |  |  |
Other provisions | € |  |  |  | 2,189 |  |  | 2,574 |  |  |  |  |  |  |
Tax proceedings | Telefónica Peru |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additions |  |  |  | 132 |  | S/ 517 | 143 |  | S/ 587 |  |  |  |  |
Tax proceedings | Telefónica Peru | Peru - Rulings in June and August 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other provisions |  |  |  | 700 |  |  | 761 |  |  |  | S/ 2,739 |  | S/ 3,117 |
Telefónica Brazil |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other possible contingencies |  |  |  | € 34 |  |  | 37 |  |  | R$ 216 |  | R$ 198 |  |
Telefónica Peru |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of years in processing lawsuits, tax litigation | yr |  |  |  | 20 |  |  |  |  |  | 20 | 20 |  |  | 20
Increase legal claim, tax litigation, (in percent) |  |  |  |  |  |  |  |  |  |  |  |  |  | 80.00%
Guarantees partially executed from tax litigation | € 272 |  | S/ 1,105 |  |  |  |  |  |  |  |  |  |  |
Tax Year 2011 to 2021 | Telefónica Brazil |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other possible contingencies |  |  |  | € 5,706 |  |  | € 5,678 |  |  | R$ 36,723 |  | R$ 30,379 |  |
Tax amortization from goodwill, assessment | € 624 | R$ 4,018 |  |  |  |  |  |  |  |  |  |  |  |

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