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Events After the Reporting Period - Narrative (Details) - EUR (€) € in Millions |  |  |  |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 23, 2023 | Jan. 18, 2023 | Jan. 17, 2023 | Feb. 01, 2022 | Jan. 31, 2023 | Dec. 31, 2022 | Nov. 30, 2022 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Feb. 14, 2023 | Jan. 13, 2023
Entity Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Contractual limit amount |  |  |  |  |  | € 83,706.0 |  | € 83,706.0 | € 84,794.0 |  |  |
Repayments of borrowings, classified as financing activities |  |  |  |  |  |  |  | 3,077.0 | 4,146.0 | € 2,852.0 |  |
Exercisable from issuer in 2024 | Gross cost |  |  |  |  |  |  |  |  |  |  |  |
Entity Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  | 1,000.0 |  | 1,000.0 | € 1,000.0 |  |  |
Amount repurchased |  |  |  |  |  |  |  | 0.0 |  |  |  |
Telefónica, S.A. |  |  |  |  |  |  |  |  |  |  |  |
Entity Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  | 32,167.0 |  | € 32,167.0 |  |  |  |
Pontel Participaciones, S.L. Holding company | Telefónica, S.A. |  |  |  |  |  |  |  |  |  |  |  |
Entity Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proportion of voting rights held in subsidiary (as a percent) |  | 70.00% |  | 83.35% |  |  |  |  |  |  |  |
Pontel Participaciones, S.L. Holding company | Pontegadea Inversiones, S.L. |  |  |  |  |  |  |  |  |  |  |  |
Entity Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proportion of voting rights held in subsidiary (as a percent) |  | 30.00% |  | 16.65% |  |  |  |  |  |  |  |
Telxius Telecom, S.A. | Pontel Participaciones, S.L. Holding company |  |  |  |  |  |  |  |  |  |  |  |
Entity Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proportion of voting rights held in subsidiary (as a percent) |  |  | 60.00% |  |  |  |  |  |  |  |  |
Telefonica Europe, B.V. |  |  |  |  |  |  |  |  |  |  |  |
Entity Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Amount repurchased |  |  |  |  |  | € 129.0 | € 621.0 |  |  |  |  |
Facility Agreement | Telefónica, S.A. | Syndicated Loan Due January 13, 2028 |  |  |  |  |  |  |  |  |  |  |  |
Entity Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Contractual limit amount |  |  |  |  |  |  |  |  |  |  |  | € 5,500.0
Acquisition Of Share Capital | Pontel Participaciones, S.L. Holding company | Telefónica, S.A. |  |  |  |  |  |  |  |  |  |  |  |
Entity Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proportion of voting rights held in subsidiary (as a percent) |  | 70.00% | 83.35% |  |  |  |  |  |  |  |  |
Acquisition Of Share Capital | Pontel Participaciones, S.L. Holding company | Pontegadea Inversiones, S.L. |  |  |  |  |  |  |  |  |  |  |  |
Entity Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proportion of voting rights held in subsidiary (as a percent) |  | 30.00% | 16.65% |  |  |  |  |  |  |  |  |
Acquisition Of Share Capital | Telxius Telecom, S.A. | Pontel Participaciones, S.L. Holding company |  |  |  |  |  |  |  |  |  |  |  |
Entity Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proportion of voting rights held in subsidiary (as a percent) |  |  | 60.00% |  |  |  |  |  |  |  |  |
Redemption of notes | Telefónica Emisiones, S.A.U. | Notes issued January 22, 2013 |  |  |  |  |  |  |  |  |  |  |  |
Entity Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Repayments of borrowings, classified as financing activities | € 1,277.0 |  |  |  |  |  |  |  |  |  |  |
Share Capital Transactions | Subordinated Securities, Issued February 2023 | Gross cost |  |  |  |  |  |  |  |  |  |  |  |
Entity Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  | € 1,000.0 |  |  |  |  |  |  |
Share Capital Transactions | Telefonica Europe, B.V. | Exercisable from issuer in 2023 |  |  |  |  |  |  |  |  |  |  |  |
Entity Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  | 1,250.0 |  |  |  |  |  |  |
Amount repurchased |  |  |  |  | 388.0 |  |  |  |  |  |  |
Share Capital Transactions | Telefonica Europe, B.V. | Exercisable from issuer in 2024 |  |  |  |  |  |  |  |  |  |  |  |
Entity Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  | 1,000.0 |  |  |  |  |  |  |
Amount repurchased |  |  |  |  | € 612.0 |  |  |  |  |  |  |
New Debt Agreement | Telefónica, S.A. | Bilateral Loan Due 2033 |  |  |  |  |  |  |  |  |  |  |  |
Entity Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Contractual limit amount |  |  |  |  |  |  |  |  |  |  | € 150.0 |
Taurus Bidco S.A.R.L. | Telxius Telecom, S.A. | Pontel Participaciones, S.L. Holding company |  |  |  |  |  |  |  |  |  |  |  |
Entity Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of voting equity interests acquired |  |  |  | 40.00% |  |  |  |  |  |  |  |
Taurus Bidco S.A.R.L. | Acquisition Of Share Capital | Telxius Telecom, S.A. | Pontel Participaciones, S.L. Holding company |  |  |  |  |  |  |  |  |  |  |  |
Entity Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of voting equity interests acquired |  | 40.00% |  |  |  |  |  |  |  |  |  |

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