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Financial Liabilities - Interest-Bearing Debt (Details) - EUR (€) € in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Jan. 26, 2022 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Jan. 13, 2022
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Contractual limit amount |  | € 83,706 | € 84,794 |  |
Drawndown |  | 839 | 3,085 | € 4,516 |
Repayments of loans, borrowings and promissory notes |  | 3,077 | 4,146 | € 2,852 |
Telefónica, S.A. |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Outstanding balance |  | 32,167 |  |  |
Telefónica, S.A. | Bilateral Loan Due December 15, 2032 |  |  |  |  |
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. | Syndicated Loan Due January 13, 2027 |  |  |  |  |
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 June 23, 2033 |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Contractual limit amount |  | 125 |  |  |
Outstanding balance |  | 0 |  |  |
Drawndown |  | 0 |  |  |
Repayments of loans, borrowings and promissory notes |  | 0 |  |  |
Telefónica, S.A. | Syndicated loan due March 15, 2026 |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Contractual limit amount |  |  |  |  | € 5,500
Colombia Telecomunicaciones S.A. E.S.P. | Bilateral Loan Due January 6, 2022 |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Contractual limit amount |  | 0 |  |  |
Outstanding balance |  | 0 |  |  |
Drawndown |  | 0 |  |  |
Repayments of loans, borrowings and promissory notes |  | 117 |  |  |
Colombia Telecomunicaciones S.A. E.S.P. | Bilateral Loan Due 2023 |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Repayments of loans, borrowings and promissory notes | € 132 |  |  |  |
Telefónica Brasil, S.A. | Bilateral Loan Due September 28, 2023 |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Contractual limit amount |  | 0 |  |  |
Outstanding balance |  | 199 | 0 |  |
Drawndown |  | 199 |  |  |
Repayments of loans, borrowings and promissory notes |  | 0 |  |  |
Bluevia Fibra, S.L.U. | Syndicated loan due December 20, 2027 |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Contractual limit amount |  | 360 |  |  |
Outstanding balance |  | 245 | 0 |  |
Drawndown |  | 245 |  |  |
Repayments of loans, borrowings and promissory notes |  | 0 |  |  |
Telxius Telecom, S.A. | Syndicated loan due December 1, 2024 |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Contractual limit amount |  | 300 |  |  |
Outstanding balance |  | 201 | € 162 |  |
Drawndown |  | 100 |  |  |
Repayments of loans, borrowings and promissory notes |  | € 70 |  |  |

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