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Basis of Presentation of the Consolidated Financial Statements - Schedule of Gain on Sale of Disposal Group (Details) - EUR (€) € in Millions |  |  |  | 7 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 31, 2021 | Jun. 01, 2021 | May 07, 2020 | Dec. 31, 2021 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Disclosure of joint ventures [line items] |  |  |  |  |  |  |
Result of the transaction: gain |  |  |  |  | € 205 | € 11,008 | € 67
VMO2 |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |
Fair value of 50% of VMO2 (Note 10) | € 12,068 |  |  | € 12,068 | € 10,718 | € 12,068 |
Proportion of ownership interest in joint venture (as a percent) | 50.00% |  |  | 50.00% | 50.00% | 50.00% |
Telefónica O2 Holdings Ltd. Holding company |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |
Result of the transaction: gain |  | € 4,460 |  |  |  |  |
Cash received |  | 6,234 |  |  |  |  |
Fair value of 50% of VMO2 (Note 10) |  | 12,012 |  |  |  |  |
Less: carrying amount of Telefonica United Kingdom at June 1, 2021 |  | (10,937) |  |  |  |  |
Liabilities assumed and other costs (see Note 29.c) |  | (441) |  |  |  |  |
Result before reclassification of translation differences and gains on hedges |  | 6,868 |  |  |  |  |
Reclassification of translation differences included in equity |  | (3,135) |  |  |  |  |
Reclassification of gains on hedges included in equity |  | € 727 |  |  |  |  |
Telefónica O2 Holdings Ltd. Holding company | VMO2 |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |
Proportion of ownership interest in joint venture (as a percent) |  | 50.00% | 50.00% |  |  |  |

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