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Financial Liabilities - Interest-Bearing Debt (Details) - EUR (€) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of detailed information about borrowings [line items] |  |  |
Contractual limit amount | € 84,933 | € 81,097 |
Drawndown | 1,760 | 1,707 | € 839
Repayments of loans, borrowings and promissory notes | 1,123 | 1,465 | € 3,077
Telefónica, S.A. |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Outstanding balance | 32,704 |  |
Telefónica, S.A. | Sustainable Syndicated due Jan 13, 2029 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Contractual limit amount | 5,500 |  |
Outstanding balance | 0 |  |
Drawndown | 0 |  |
Repayments of loans, borrowings and promissory notes | 0 |  |
Telefónica, S.A. | Bilateral Loan Due July 31, 2034 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Contractual limit amount | 0 |  |
Outstanding balance | 150 |  |
Drawndown | 150 |  |
Repayments of loans, borrowings and promissory notes | 0 |  |
Telefónica, S.A. | Bilateral Loan Due October 31, 2031 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Contractual limit amount | 0 |  |
Outstanding balance | 140 |  |
Drawndown | 140 |  |
Repayments of loans, borrowings and promissory notes | 0 |  |
Telefónica, S.A. | Bilateral Loan Due December 16, 2031 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Contractual limit amount | 0 |  |
Outstanding balance | 100 |  |
Drawndown | 100 |  |
Repayments of loans, borrowings and promissory notes | 0 |  |
Bluevia Fibra S.L.U. | Syndicated Loan Due December 20, 2029 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Contractual limit amount | 360 |  |
Outstanding balance | 325 | 250 |
Drawndown | 75 |  |
Repayments of loans, borrowings and promissory notes | 0 |  |
Contractual limit amount credit facility | 360 |  |
Telxius Telecom, S.A. | Syndicated Loan Due December 04, 2029 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Contractual limit amount | 145 |  |
Outstanding balance | 100 | € 100 |
Drawndown | 0 |  |
Repayments of loans, borrowings and promissory notes | 0 |  |
Contractual limit amount credit facility | € 145 |  |

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