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Events after the Reporting Period - Narrative (Details) € in Millions, S/ in Millions, $ in Millions |  |  |  |  |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 24, 2025 EUR (€) | Feb. 24, 2025 USD ($) | Feb. 14, 2025 EUR (€) peruvianNuevoSolPerEur | Jan. 17, 2025 EUR (€) | Jan. 13, 2025 EUR (€) extension | Jan. 10, 2025 EUR (€) | Dec. 31, 2024 EUR (€) yr | Dec. 31, 2023 EUR (€) | Dec. 31, 2022 EUR (€) yr | Feb. 14, 2025 PEN (S/) | Jan. 16, 2025 EUR (€) | Jan. 15, 2025 EUR (€)
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |  |  |  |  |  |
Repayments of bonds, notes and debentures |  |  |  |  |  |  | € 1,140 | € 1,910 | € 3,541 |  |  |
Contractual limit amount |  |  |  |  |  |  | 84,933 | 81,097 |  |  |  |
Accumulated contribution of translation differences |  |  |  |  |  |  | (21,279) | (20,686) | € (20,723) |  |  |
Argentina |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |  |  |  |  |  |
Net assets |  |  |  |  |  |  | € 1,175 | 1,149 |  |  |  |
Telefónica Móviles Argentina, S.A. Telecommunications service provider |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) |  |  |  |  |  |  | 100.00% |  |  |  |  |
Accumulated contribution of translation differences |  |  |  |  |  |  | € 1,107 | € 2,006 |  |  |  |
TLH Holdco, S.L.U. Holding company |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) |  |  |  |  |  |  | 100.00% |  |  |  |  |
Sale of shares | Telefónica Móviles Argentina, S.A. Telecommunications service provider |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of shares transferred | 1 | 1 |  |  |  |  |  |  |  |  |  |
Consideration received | € 1,189 | $ 1,245 |  |  |  |  |  |  |  |  |  |
Credit Facility Due Aug 2026 | Loans and other debts |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |  |  |  |  |  |
Contractual limit amount |  |  | € 394 |  |  |  |  |  |  | S/ 1,549 |  |
Credit Facility Due Aug 2026 | Loans and other debts | Telefónica Peru |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |  |  |  |  |  |
Contractual limit amount credit facility |  |  | € 394 |  |  |  |  |  |  | S/ 1,549 |  |
Average foreign exchange rate | peruvianNuevoSolPerEur |  |  | 3.93 |  |  |  |  |  |  |  |  |
Credit facility term |  |  | 18 months |  |  |  |  |  |  |  |  |
Telefónica Germany GmbH & Co. OHG Wireless communications services operator | Sustainable Syndicated due Jan 13, 2029 | Loans and other debts |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |  |  |  |  |  |
Repayments of bonds, notes and debentures |  |  |  |  |  | € 750 |  |  |  |  |  |
Telefónica, S.A. |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  | € 32,704 |  |  |  |  |
Telefónica, S.A. | Sustainable Syndicated due Jan 13, 2029 |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |  |  |  |  |  |
Contractual limit amount |  |  |  |  |  |  | 5,500 |  |  |  |  |
Borrowings |  |  |  |  |  |  | € 0 |  |  |  |  |
Telefónica, S.A. | Sustainable Syndicated due Jan 13, 2029 | Loans and other debts |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |  |  |  |  |  |
Contractual limit amount credit facility |  |  |  |  | € 5,500 |  |  |  |  |  |  |
Borrowings, number of extensions | extension |  |  |  |  | 2 |  |  |  |  |  |  |
Borrowings, term extension |  |  |  |  | 1 year |  |  |  |  |  |  |
Telefónica, S.A. | Bilateral Loan Due January 15 2035 | Loans and other debts |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |  |  |  |  |  |
Contractual limit amount |  |  |  |  |  |  |  |  |  |  |  | € 125
Borrowings |  |  |  |  |  |  |  |  |  |  |  | € 0
Telefónica Emisiones, S.A.U. | Loans and other debts |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |  |  |  |  |  |
Repayments of bonds, notes and debentures |  |  |  | € 1,250 |  |  |  |  |  |  |  |
Debt instruments issued |  |  |  |  |  |  |  |  |  |  | € 1,000 |
Telefónica Emisiones, S.A.U. | Loans and other debts | Fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |  |  |  |  |  |
Annual Fix |  |  |  |  |  |  |  |  |  |  | 3.724% |
Telefónica Peru |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |  |  |  |  |  |
Number of years in processing lawsuits, tax litigation | yr |  |  |  |  |  |  | 20 |  | 20 |  |  |
TLH Holdco, S.L.U. Holding company | Telefónica Móviles Argentina, S.A. Telecommunications service provider |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) |  |  |  |  |  |  | 99.99963% |  |  |  |  |

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